SpatiaLite 5.1.0 空间函数全量地图

ℹ️ 读者定位

适合你，如果： 你正在用 SQLite、SpatiaLite、QGIS、Java 或 Python 查询空间数据，想知道每个函数属于哪一层、输入什么、输出什么。

开始前需要： 会执行基础 SQL，并准备一个加载了 mod_spatialite 的 SQLite 连接；如果只看目录，不需要先安装。

读完可以完成： 按函数类别查找 SpatiaLite 5.1.0 函数，判断依赖模块，执行 Geometry、空间关系、坐标转换、RTree 和拓扑验证。

暂时不适合： 需要 PostGIS 全部行为对照、完整 C API 开发或 RasterLite2 深度开发的场景；本文重点是 SQL 函数地图。

在工作中，我们经常遇到一个问题：看到函数名带 ST_，却不知道它到底来自 SQLite、SpatiaLite、GEOS、PROJ 还是 RTTOPO。更麻烦的是，同一个页面里既有 ST_Intersects 这样的几何谓词，也有 CreateSpatialIndex、ImportSHP、WMS_GetMapRequestURL 这样的空间数据库支撑函数。

这篇文章把官方 SpatiaLite 5.1.0 SQL 参考页整理成一张可查、可执行、可解释的函数地图。先用逻辑图建立直觉，再把完整函数名放进附录，最后用 SQL 检查当前构建到底启用了哪些能力。

本文的"全量"采用官方 5.1.0 函数参考的章节口径：包括核心 Geometry 函数，也包括空间元数据、索引、拓扑、网络、GeoPackage、WMS、XmlBLOB 和导入导出等空间支撑模块。它们不是同一种计算，也不一定在每个构建中都可用。

一、先建立一张空间函数能力地图

SpatiaLite 可以理解为 SQLite 文件数据库外面接了一层空间函数注册机制。Geometry 进入 SQL 后，会沿着"输入格式 → Geometry → 属性/关系/运算 → 元数据或外部格式"的链路流动。

SpatiaLite 5.1.0 空间函数能力地图

这张图先记住三件事：

• Geometry 是核心数据对象，不是普通 WKT 文本。
• GEOS 主要负责精确几何关系和派生运算。
• PROJ 负责 CRS/SRID 相关转换，RTTOPO 负责一部分拓扑修复、拆分和网络能力。

1.1 官方文档地址

• SpatiaLite 5.1.0 SQL functions reference：最重要的函数总表，按章节给出名称、签名、模块和摘要。
• SpatiaLite 官方项目主页：源码、版本、下载和文档入口。
• SpatiaLite 5.1.0 Doxygen PDF：底层 C API 和库结构。
• SpatiaLite Cookbook Metadata：空间元数据、GeoTable 和空间索引。
• PROJ.6 support update：PROJ 数据库和新 CRS API 的版本说明。

1.2 函数能不能用，先看底层模块

函数来源	主要能力	常见函数	常见不可用原因
base / SpatiaLite	Geometry 编解码、元数据、基础访问器	ST_GeomFromText、ST_AsText、ST_SRID、CreateSpatialIndex	扩展没加载或版本过旧
GEOS	精确空间关系、距离、缓冲、拓扑运算	ST_Intersects、ST_Area、ST_Buffer、ST_Intersection	编译时未启用 GEOS
GEOS advanced	三角剖分、凹包、最小外接结构等	ST_DelaunayTriangulation、ST_ConcaveHull	GEOS 版本不满足
PROJ	CRS 检查、SRID 转换和 CRS 文本	ST_Transform、PROJ_AsWKT	未启用 PROJ 或 PROJ 数据库不可用
RTTOPO	几何修复、拆分、拓扑和网络	ST_MakeValid、ST_Split、CreateTopology	未启用 RTTOPO
LibXML2 / RasterLite2	XML、样式、WMS 和栅格相关支撑	XB_IsValid、SE_RegisterVectorStyle、WMS_GetMapRequestURL	可选依赖未编译

⚠️ 函数名不是能力证明

看到 ST_Intersects 不代表当前连接一定注册了它。先执行 SELECT spatialite_version(), HasGeos(), HasProj(), HasRtTopo()； 再执行具体函数。

二、Geometry 从哪里来，又会变成什么

2.1 从 WKT、WKB 和外部格式构造 Geometry

构造类函数负责把文本、二进制或外部格式转成数据库能够识别的 Geometry。它们的逻辑不是"把字符串放进列"，而是生成带有空间类型和 SRID 语义的 Geometry 值。

Geometry 构造与格式转换逻辑

函数家族	输入	处理	输出
WKT 构造	WKT 文本、SRID	解析几何文本	Geometry
WKB 构造	WKB BLOB、SRID	解析二进制	Geometry
点线面构造	坐标、半径、网格参数	直接生成 Geometry	Point/Line/Polygon/Collection
外部格式构造	KML、GML、GeoJSON、EWKB、TWKB	外部格式解析	Geometry

常用验证 SQL：

SELECT ST_AsText(ST_GeomFromText('POINT(113 28)', 4490));
SELECT ST_AsText(ST_GeomFromWKB(GeomFromText('POINT(113 28)', 4490)));
SELECT ST_AsGeoJSON(ST_GeomFromText('POINT(113 28)', 4490));

这里一定要注意：WKT 是文本表达，Geometry 是数据库空间对象。对于你前面遇到的 QGIS 能识别表但绘制不出图斑的问题，首先要检查 Geometry 列是否是合法的 SpatiaLite GAIA BLOB。

2.2 输出 WKT、WKB 和互操作格式

输出类函数把 Geometry 转成调试、传输或互操作格式：

• ST_AsText、AsWKT：输出 WKT 文本。
• ST_AsBinary：输出 WKB。
• AsGeoJSON、AsKml、AsGml、AsSVG：面向 Web、GIS 或文档交换。
• AsEWKB、AsEWKT、AsTWKB：保留更多空间维度或压缩语义。
• ST_AsEncodedPolyline、ST_LineFromEncodedPolyline：用于编码折线。

输出为空或报错时，优先检查输入是否 NULL、Geometry BLOB 是否损坏、SRID 是否存在以及可选库是否启用。

2.3 Geometry 检查和访问器

Geometry 进入运算前，建议先检查类型、SRID、维度、有效性和空值，再按具体类型读取坐标、点数、环数或集合成员。

Geometry 检查与访问器逻辑

检查/访问类别	代表函数	输出逻辑
类型和 SRID	ST_GeometryType、ST_SRID、GeometryType	文本或整数
维度	ST_Dimension、ST_NDims、ST_Is3D、ST_IsMeasured	维度/布尔整数
质量	ST_IsEmpty、ST_IsSimple、ST_IsValid、ST_IsValidReason	布尔值或原因文本
Point	ST_X、ST_Y、ST_Z、ST_M	坐标数值
LineString	ST_NumPoints、ST_PointN、ST_Length	点数、点或长度
Polygon	ST_Area、ST_Centroid、ST_ExteriorRing、ST_NumInteriorRing	面积、Geometry 或环数
集合	ST_NumGeometries、ST_GeometryN	成员数量或成员 Geometry

SELECT
    PK_UID,
    ST_GeometryType(Geometry),
    ST_SRID(Geometry),
    ST_IsValid(Geometry),
    ST_IsEmpty(Geometry),
    substr(ST_AsText(Geometry), 1, 160)
FROM cun11
LIMIT 1;

三、空间关系、距离和线性参考

3.1 MBR 是候选筛选，GEOS 才是精确关系

SpatiaLite 的空间关系函数有两层：MBR 函数只比较最小外接矩形，速度快但可能产生候选误报；ST_Intersects、ST_Within、ST_Contains 等精确谓词比较真实 Geometry。

MBR 与 GEOS 精确空间谓词

关系层	代表函数	返回	使用建议
MBR 近似关系	MbrIntersects、MbrWithin、MbrContains、MbrDisjoint	0/1	用于候选过滤
精确关系	ST_Intersects、ST_Within、ST_Contains、ST_Touches、ST_Overlaps	0/1	用于最终判断
距离关系	ST_Distance、ST_DistanceWithin、PtDistWithin	数值或 0/1	先确认坐标单位

同一张表检查重叠图斑时，推荐先利用 idx_cun11_Geometry 做 MBR 候选筛选，再用 ST_Intersects 和 ST_Area(ST_Intersection(...)) 做精确判断。

3.2 距离与线性参考

距离函数和线性参考函数处理的是"多远"和"沿线到哪里"：

• ST_Distance：返回两个 Geometry 的距离。
• ST_DistanceWithin：判断是否小于阈值。
• ST_AddMeasure：给线性 Geometry 添加线性 M 值。
• ST_LocateAlong、ST_LocateBetween：按照 M 值定位点或子几何。
• ST_InterpolatePoint、ST_TrajectoryInterpolatePoint：执行线性插值。

距离和线性参考函数逻辑

⚠️ 面积和距离的单位

ST_Area、ST_Length、ST_Distance 使用当前 CRS 的坐标单位。SRID=4490 这类经纬度坐标不能直接把结果当成平方米或米；需要先选择合适的投影 CRS，或采用地理测量函数。

四、GEOS 运算与 RTTOPO 修复

4.1 派生 Geometry

空间操作函数通常输入一个或两个 Geometry，输出新的 Geometry。它们会改变几何形状，但不会自动替你维护业务属性表。

GEOS 与 RTTOPO 派生和修复

操作	函数	输出
集合运算	ST_Intersection、ST_Difference、ST_Union、ST_SymDifference	派生 Geometry
形状扩展	ST_Buffer、ST_ConvexHull、ST_OffsetCurve	派生 Geometry
线面处理	ST_LineMerge、ST_Polygonize、ST_BuildArea、ST_CollectionExtract	派生 Geometry
高级 GEOS	ST_DelaunayTriangulation、ST_ConcaveHull、ST_HausdorffDistance	三角网、凹包或距离结果
RTTOPO 修复	ST_MakeValid、ST_SnapToGrid、ST_Split、ST_Subdivide	修复或拆分 Geometry

重叠区域查询的核心就是：先 ST_Intersects 判断，再 ST_Intersection 生成重叠 Geometry，最后 ST_Area 计算面积。

4.2 几何质量修复

常见修复链路如下：

SELECT
    ST_IsValid(Geometry) AS before_valid,
    ST_IsValidReason(Geometry) AS reason,
    ST_AsText(ST_MakeValid(Geometry)) AS repaired_wkt
FROM cun11
WHERE PK_UID = 1;

修复函数可能返回 NULL，或者输出 Geometry 类型发生变化。写回数据库前要重新检查 SRID、GeometryType、有效性和业务属性关联。

五、SRID、PROJ 和坐标变换

5.1 先理解 CRS，再调用 ST_Transform

ST_Transform 不是简单地给 Geometry 换一个 SRID 数字，而是根据源 CRS 和目标 CRS 重新计算坐标。源 Geometry 的 SRID、PROJ 数据库、轴顺序和目标 SRID 都会影响结果。

SRID 与 PROJ 坐标转换

常用函数分为三组：

• SRID 检查：SridIsGeographic、SridIsProjected、SridGetProjection、SridGetUnit、SridGetAxis_1_Name。
• CRS 描述：PROJ_AsWKT、PROJ_AsProjString、PROJ_GuessSridFromWKT。
• Geometry 变换：ST_Transform、ST_TransformXY、ST_TransformXYZ、ST_Translate、ScaleCoordinates、RotateCoordinates。

SELECT spatialite_version(), HasProj();
SELECT ST_SRID(ST_Transform(Geometry, 4490))
FROM cun11
LIMIT 1;

5.2 坐标变换和几何平移不是一回事

ST_Transform 改变的是 CRS 语义和坐标值；ST_Translate、ScaleCoordinates、RotateCoordinates 主要是对坐标进行几何变换，不等于坐标参考系转换。不要把两个概念混用。

六、空间元数据、GeoTable 和 RTree

6.1 元数据函数负责让 GIS 认识表

geometry_columns 记录表名、Geometry 列、类型、维度和 SRID；spatial_ref_sys 记录 CRS 定义。AddGeometryColumn、RecoverGeometryColumn 和 DiscardGeometryColumn 比直接手工修改元数据表更安全。

空间元数据与 RTree 索引

常见流程：

1. InitSpatialMetaData 创建空间元数据表。
2. 创建普通表和 Geometry 列。
3. AddGeometryColumn 或 RecoverGeometryColumn 注册 GeoTable。
4. CreateSpatialIndex 建立 RTree、索引表和维护触发器。
5. 查询时先用 RTree/MBR 找候选，再用精确函数判断。
6. 数据结构变化后使用 CheckSpatialIndex、RecoverSpatialIndex、UpdateLayerStatistics 维护。

SELECT InitSpatialMetaData(1);
SELECT CreateSpatialIndex('cun11', 'Geometry');
SELECT CheckSpatialIndex('cun11', 'Geometry');

6.2 MbrCache 和空间索引的区别

RTree 是空间索引结构；MbrCache 是另一种把外包矩形缓存到表或查询流程中的优化方式。两者都不能把 MBR 近似判断当成最终的精确关系。

七、拓扑、网络和空间互操作

7.1 Topology-Geometry 与 Topology-Network

普通 Geometry 更像"每条记录独立保存一块形状"；拓扑模型会显式管理节点、边、面和共享关系，适合行政边界一致性、道路网络和拓扑编辑。

Topology-Geometry 与 Topology-Network

• Topology-Geometry：CreateTopology、AddIsoNode、AddIsoEdge、NewEdgesSplit、NewEdgeHeal、GetFaceGeometry、ValidateTopoGeo。
• Topology-Network：CreateNetwork、AddIsoNetNode、AddLink、NewLinkHeal、GetNetNodeByPoint、GetLinkByPoint、ValidSpatialNet。

这类函数不是普通的 ST_Intersection 替代品，它们会创建和维护额外的拓扑/网络元数据表、触发器和关联对象。

7.2 GeoPackage、WMS、XmlBLOB 和格式互操作

Spatialite 5.1.0 还提供大量空间支撑函数：

• FDO/OGR：检查和注册兼容元数据。
• GeoPackage：GeoPackage 元数据、Geometry Binary、空间索引和 Geometry 兼容转换。
• WMS：创建配置表、注册 GetCapabilities/GetMap、生成请求 URL。
• XmlBLOB：保存、压缩、校验和读取 XML、SLD/SE、GPX 或地图配置。
• 导入导出：ImportSHP、ExportSHP、ImportGeoJSON、ExportGeoJSON、ExportKML、ImportDXF。

空间互操作与外部格式

这些函数解决的是数据交换和数据库支撑，不要把它们和 GEOS 的 Geometry 运算混为一谈。

八、用 SQL 检查当前构建到底支持什么

先加载扩展，再执行以下检查：

SELECT spatialite_version();
SELECT HasGeos(), HasGeosAdvanced(), HasProj(), HasProj6(), HasRtTopo();
SELECT HasGeoPackage(), HasTopology(), HasRouting(), HasLibXML2();

验证核心 Geometry：

SELECT ST_AsText(ST_GeomFromText('POINT(113 28)', 4490));
SELECT ST_GeometryType(Geometry), ST_SRID(Geometry), ST_IsValid(Geometry)
FROM cun11 LIMIT 1;
SELECT COUNT(*), SUM(ST_Area(Geometry)) FROM cun11;

验证关系和操作：

SELECT COUNT(*)
FROM cun11 AS a
WHERE ST_Intersects(
    a.Geometry,
    (SELECT Geometry FROM cun11 WHERE PK_UID = 1)
) = 1;
 
SELECT ST_AsText(
    ST_Intersection(a.Geometry, b.Geometry)
)
FROM cun11 AS a
JOIN cun11 AS b ON a.PK_UID < b.PK_UID
WHERE ST_Intersects(a.Geometry, b.Geometry) = 1
LIMIT 1;

验证索引和 CRS：

SELECT CheckSpatialIndex('cun11', 'Geometry');
SELECT ST_SRID(ST_Transform(Geometry, 4490))
FROM cun11 LIMIT 1;

☑️ 实际函数验证截图待补充

请在加载 mod_spatialite 5.1.0 的 Linux 或 Windows 连接中补充真实 SQL 输出，至少包含版本、HasGeos/HasProj/HasRtTopo、ST_AsText、ST_IsValid、ST_Intersects、ST_Area、ST_Transform 和 CheckSpatialIndex。

建议文件名：截图资源/11-sql-function-verification.png。

九、官方 5.1.0 全量函数目录

下面的函数内容改为按官方章节分组的表格。字段含义如下：

• 序号：全量目录中的连续编号。
• 函数名：官方页面列出的函数名；同一行多个名称表示官方标注的别名。
• 函数功能：按所在官方章节归纳的中文功能。
• 详细说明：保留官方 Syntax 和 Summary，并补充依赖/返回信息，便于直接转成 SQL 验证。

ℹ️ 使用提示

表格是目录和检索入口，不替代官方页面中的完整参数说明。遇到 NULL、可选模块、弃用函数或版本差异时，应以官方 Syntax 和原文说明为准。

9.1 SQL Version Info and build options testing functions

序号	函数名	函数功能	详细说明
1	spatialite_version	版本与编译能力检查	语法：spatialite_version( void ) : String；官方摘要：returns the current SpatiaLite version as a text string
2	spatialite_target_cpu	版本与编译能力检查	语法：spatialite_target_cpu( void ) : String；官方摘要：returns the current SpatiaLite Target CPU as a text string
3	check_strict_sql_quoting	版本与编译能力检查	语法：rcheck_strict_sql_quoting( void ) : String；官方摘要：returns TRUE or FALSE depending on the actual behavior of current SQLite .； Note :SQLite can effectively enforce strict SQL quoting ( single-quoted text constants and double-quo...
4	freexl_version	版本与编译能力检查	语法：freexl_version( void ) : String；官方摘要：returns the current FreeXL version as a text string； or NULL if FreeXL is currently unsupported
5	proj_version	版本与编译能力检查	语法：proj_version( void ) : String ； proj4_version( void ) : Sting；官方摘要：returns the current PROJ version as a text string； or NULL if PROJ is currently unsupported.； Due to historical reasons there are two alias names for the same functionality.； No...
6	geos_version	版本与编译能力检查	语法：geos_version( void ) : String；官方摘要：returns the current GEOS version as a text string； or NULL if GEOS is currently unsupported
7	rttopo_version	版本与编译能力检查	语法：rttopo_version( void ) : String；官方摘要：returns the current RTTOPO version as a text string； or NULL if RTTOPO is currently unsupported
8	libxml2_version	版本与编译能力检查	语法：libxml2_version( void ) : String；官方摘要：returns the current LibXML2 version as a text string； or NULL if LibXML2 is currently unsupported
9	HasIconv	版本与编译能力检查	语法：HasIconv( void ) : Boolean；官方摘要：TRUE if the underlying library was built enabling ICONV
10	HasMathSQL	版本与编译能力检查	语法：HasMathSQL( void ) : Boolean；官方摘要：TRUE if the underlying library was built enabling MATHSQL
11	HasGeoCallbacks	版本与编译能力检查	语法：HasGeoCallbacks( void ) : Boolean；官方摘要：TRUE if the underlying library was built enabling GEOCALLBACKS
12	HasProj	版本与编译能力检查	语法：HasProj( void ) : Boolean；官方摘要：TRUE if the underlying library was built enabling PROJ
13	HasProj6	版本与编译能力检查	语法：HasProj6( void ) : Boolean；官方摘要：TRUE if the underlying library was built enabling PROJ version 6 or any later
14	HasGeos	版本与编译能力检查	语法：HasGeos( void ) : Boolean；官方摘要：TRUE if the underlying library was built enabling GEOS
15	HasGeosAdvanced	版本与编译能力检查	语法：HasGeosAdvanced( void ) : Boolean；官方摘要：TRUE if the underlying library was built enabling GEOSADVANCED
16	HasGeos3100	版本与编译能力检查	语法：HasGeos3100( void ) : Boolean；官方摘要：TRUE if the underlying library was built enabling GEOS3100
17	HasGeos3110	版本与编译能力检查	语法：HasGeos3110( void ) : Boolean；官方摘要：TRUE if the underlying library was built enabling GEOS3110
18	HasGeosTrunk	版本与编译能力检查	语法：HasGeosTrunk( void ) : Boolean；官方摘要：TRUE if the underlying library was built enabling GEOSTRUNK
19	HasGeosReentrant	版本与编译能力检查	语法：HasGeosReentrant( void ) : Boolean；官方摘要：TRUE if the underlying library was built enabling GEOSREENTRANT
20	HasGeosOnlyReentrant	版本与编译能力检查	语法：HasGeosOnlyReentrant( void ) : Boolean；官方摘要：TRUE if the underlying library was built enabling GEOSONLYREENTRANT
21	HasMiniZip	版本与编译能力检查	语法：HasMiniZip( void ) : Boolean；官方摘要：TRUE if the underlying library was built enabling MINIZIP
22	HasRtTopo	版本与编译能力检查	语法：HasRtTopo( void ) : Boolean；官方摘要：TRUE if the underlying library was built enabling RTTOPO
23	HasLibXML2	版本与编译能力检查	语法：HasLibXML2( void ) : Boolean；官方摘要：TRUE if the underlying library was built enabling LibXML2
24	HasEpsg	版本与编译能力检查	语法：HasEpsg( void ) : Boolean；官方摘要：TRUE if the underlying library was built enabling EPSG
25	HasFreeXL	版本与编译能力检查	语法：HasFreeXL( void ) : Boolean；官方摘要：TRUE if the underlying library was built enabling FREEXL
26	HasGeoPackage	版本与编译能力检查	语法：HasGeoPackage( void ) : Boolean；官方摘要：TRUE if the underlying library was built enabling GeoPackage support ( GPKG )
27	HasGCP	版本与编译能力检查	语法：HasGCP( void ) : Boolean ； HasGroundControlPoints ( void ) : Boolean；官方摘要：TRUE if the underlying library was built enabling Ground Control Points support ( GGP )
28	HasTopology	版本与编译能力检查	语法：HasTopology( void ) : Boolean；官方摘要：TRUE if the underlying library was built enabling Topology (RTTOPO) support
29	HasKNN	版本与编译能力检查	语法：HasKNN( void ) : Boolean；官方摘要：TRUE if the underlying library was built enabling VirtualKNN (KNN) support
30	HasRouting	版本与编译能力检查	语法：HasRouting( void ) : Boolean；官方摘要：TRUE if the underlying library was built enabling VirtualRouting support

9.2 Generic SQL functions

序号	函数名	函数功能	详细说明
31	IsInteger	通用 SQL、类型与字符串处理	语法：IsInteger( value Text ) : Integer；官方摘要：Checks a TEXT string testing if it corresponds to an Integer Number.； The function returns 1 if TRUE and 0 if FALSE ; -1 is returned when the argument is not a Text string.； Exa...
32	IsDecimalNumber	通用 SQL、类型与字符串处理	语法：IsDecimalNumber( value Text ) : Integer；官方摘要：Checks a TEXT string testing if it corresponds to a Decimal Number.； The function returns 1 if TRUE and 0 if FALSE ; -1 is returned when the argument is not a Text string.； Exam...
33	IsNumber	通用 SQL、类型与字符串处理	语法：IsNumber( value Text ) : Integer；官方摘要：Checks a TEXT string testing if it corresponds to a Number.； The function returns 1 if TRUE and 0 if FALSE ; -1 is returned when the argument is not a Text string.； convenience ...
34	CastToInteger	通用 SQL、类型与字符串处理	语法：CastToInteger( value Generic ) : Integer；官方摘要：returns the intput value possibly casted to the Integer data-type; NULL if no conversion is possible.
35	CastToDouble	通用 SQL、类型与字符串处理	语法：CastToDouble( value Generic ) : Double precision；官方摘要：returns the intput value possibly casted to the Double data-type; NULL if no conversion is possible.
36	CastToText	通用 SQL、类型与字符串处理	语法：CastToText( value Generic ) : Text ； CastToText( value Generic , zero_pad Integer ) : Text；官方摘要：returns the intput value possibly casted to the Text data-type; NULL if no conversion is possible.； If an optional argument zero_pad is passed and the input value is of the Inte...
37	CastToBlob	通用 SQL、类型与字符串处理	语法：CastToBlob( value Generic ) : Blob ； CastToBlob( value Generic , hex_input Boolean ) : Blob；官方摘要：returns the intput value possibly casted to the BLOB data-type: if the optional argument hex_input is set to TRUE the input value will be expected to correspond to an HexaDecima...
38	ForceAsNull	通用 SQL、类型与字符串处理	语法：ForceAsNull( val1 Generic , val2 Generic ) : Generic；官方摘要：if val1 and val2 are equal (and of the same data-type) NULL will be returned; otherwise val1 will be returned unchanged, preserving its original data-type.
39	GetDbObjectScope	通用 SQL、类型与字符串处理	语法：GetDbObjectScope( db-prefix Text , obj-name Text ) : Text；官方摘要：db-prefix can be NULL , and in this case the "MAIN" database will be assumed. obj-name must identify any valid DB-Object ( Table . View , Trigger or Index ). ； Returns a short d...
40	CreateUUID	通用 SQL、类型与字符串处理	语法：CreateUUID( void ) : Text；官方摘要：returns a Version 4 (random) UUID ( Universally unique identifier ).
41	MD5Checksum	通用 SQL、类型与字符串处理	语法：MD5Checksum( BLOB ／ TEXT ) : Text；官方摘要：returns the MD5 checksum corresponding to the input value.；Will return NULL for non-BLOB or non-TEXT input.
42	MD5TotalChecksum	通用 SQL、类型与字符串处理	语法：MD5TotalChecksum( BLOB ／ TEXT ) : Text；官方摘要：returns a cumulative MD5 checksum.； aggregate function
43	EncodeURL	通用 SQL、类型与字符串处理	语法：EncodeURL( url Text ) : Text ； EncodeURL( url Text , charset Text ) : Text；官方摘要：returns the percent encoded URL corresponding to the input value.；Will return NULL for invalid input. the input URL is always assumed to be an UTF-8 string. the output URL will ...
44	DecodeURL	通用 SQL、类型与字符串处理	语法：DecodeURL( url Text ) : Text ； DecodeURL( url Text , charset Text ) : Text；官方摘要：returns a plain URL from its corresponding percent encoding.；Will return NULL for invalid input. the output URL will be always returned as an UTF-8 string. the input URL will be...
45	DirNameFromPath	通用 SQL、类型与字符串处理	语法：DirNameFromPath( TEXT ) : Text；官方摘要：returns the Directory Name from a relative or absolute Pathname.；Will return NULL for invalid input of for any simple path lacking a Directory.
46	FullFileNameFromPath	通用 SQL、类型与字符串处理	语法：FullFileNameFromPath( TEXT ) : Text；官方摘要：returns the Full File Name (including an eventual File Extension) from a relative or absolute Pathname.；Will return NULL for invalid input of for any path lacking a File Name.
47	FileNameFromPath	通用 SQL、类型与字符串处理	语法：FileNameFromPath( TEXT ) : Text；官方摘要：returns the File Name (excluding an eventual File Extension) from a relative or absolute Pathname.；Will return NULL for invalid input of for any path lacking a File Name.
48	FileExtFromPath	通用 SQL、类型与字符串处理	语法：FileExtFromPath( TEXT ) : Text；官方摘要：returns the File Extension from a relative or absolute Pathname.；Will return NULL for invalid input of for any path lacking a File Name or when no Extension is present.
49	RemoveExtraSpaces	通用 SQL、类型与字符串处理	语法：RemoveExtraSpaces( TEXT ) : Text；官方摘要：returns a text string containing no repeated whitespaces ( SPACE or TAB characters).；Will return NULL for invalid input.
50	MakeStringList	通用 SQL、类型与字符串处理	语法：MakeStringList( value ) : Text ； MakeStringList( value , delimiter text ) : Text；官方摘要：returns a comma-delimited list of integer or text values.； the optional argument delimiter can be used so to specify an alternative delimiter different from comma.； aggregate fu...
51	eval	通用 SQL、类型与字符串处理	语法：eval( X TEXT [ , Y TEXT ) : Text；官方摘要：Evaluate the SQL text in X . Return the results, using string Y as the separator.； If Y is omitted, use a single space character.； Explicitly setting the environment variable SP...
52	PostgreSQL_GetLastError	通用 SQL、类型与字符串处理	语法：PostgreSQL_GetLastError() : Text；官方摘要：returns the most recent error message raised by PostgreSQL.； NULL if there is no pending error message available.
53	PostgreSQL_ResetLastError	通用 SQL、类型与字符串处理	语法：PostgreSQL_ResetLastError() : Integer；官方摘要：Resets the most recent error message raised by PostgreSQL.； Returns 1 on success and 0 on failure.； Only intended for internal usage by the VirtualPostgres extension module.
54	PostgreSQL_SetLastError	通用 SQL、类型与字符串处理	语法：PostgreSQL_SetLastError( TEXT ) : Integer；官方摘要：Permanently sets the most recent error message raised by PostgreSQL.； Returns 1 on success and 0 on failure; -1 if the argument is not a Text string.； Only intended for internal...

9.3 Global settings per connection

序号	函数名	函数功能	详细说明
55	EnableGpkgMode	空间 SQL 支撑函数	语法：EnableGpkgMode( void ) : void；官方摘要：Enables the Geopackage mode ； All connections are initially started with a disabled GPKG mode, that must be explicitly enabled whenever required.； Enabling GPKG mode is a suppor...
56	DisableGpkgMode	空间 SQL 支撑函数	语法：DisableGpkgMode( void ) : void；官方摘要：Disables the Geopackage mode
57	GetGpkgMode	空间 SQL 支撑函数	语法：GetGpkgMode( void ) : boolean；官方摘要：Returns TRUE if the Geopackage mode is currently enabled, otherwise FALSE
58	EnableGpkgAmphibiousMode	空间 SQL 支撑函数	语法：EnableGpkgAmphibiousMode( void ) : void；官方摘要：Enables the Geopackage amphibious mode ； All connections are initially started with a disabled amphibious mode, that must be explicitly enabled whenever required.； Note : GPKG m...
59	DisableGpkgAmphibiousMode	空间 SQL 支撑函数	语法：DisableGpkgAmphibiousMode( void ) : void；官方摘要：Disables the Geopackage amphibious mode
60	GetGpkgAmphibiousMode	空间 SQL 支撑函数	语法：GetGpkgAmphibiousMode( void ) : boolean；官方摘要：Returns TRUE if the Geopackage amphibious mode is currently enabled, otherwise FALSE
61	SetDecimalPrecision	空间 SQL 支撑函数	语法：SetDecimalPrecision( integer ) : void；官方摘要：Explicitly sets the number of decimal digits ( precision ) to be displayed by ST_AsText() for coordinate values: the standard default setting is 6 decimal digits.； Passing any n...
62	GetDecimalPrecision	空间 SQL 支撑函数	语法：GetDecimalPrecision( void ) : integer；官方摘要：Returns the currently set decimal precision .； A negative precision identifies the default setting.
63	EnableTinyPoint	空间 SQL 支撑函数	语法：EnableTinyPoint( void ) : void；官方摘要：Enables the TinyPoint BLOB encoding for all Point-Geometries being created.； All connections are initially started with a disabled TinyPoint BLOB encoding, that must be explicit...
64	DisableTinyPoint	空间 SQL 支撑函数	语法：DisableTinyPoint( void ) : void；官方摘要：Disables the TinyPoint BLOB encoding; all Point-Geometries will then be created applying the classic BLOB-Geometry encoding.
65	IsTinyPointEnabled	空间 SQL 支撑函数	语法：IsTinyPointEnabled( void ) : boolean；官方摘要：Returns TRUE if the TinyPoint BLOB encoding is currently enabled, otherwise FALSE
66	BufferOptions_Reset	空间 SQL 支撑函数	语法：BufferOptions_Reset( void ) : boolean；官方摘要：Will reset all BufferOptions to their initial default settings.； Returns TRUE on success, FALSE on failure.
67	BufferOptions_SetEndCapStyle	空间 SQL 支撑函数	语法：BufferOptions_SetEndCapStyle( style Text ) : boolean；官方摘要：Will set the current EndCap Style. Accepted styles ( case insensitive ) are: ROUND , FLAT , SQUARE ； Returns TRUE on success, FALSE on failure.
68	BufferOptions_GetEndCapStyle	空间 SQL 支撑函数	语法：BufferOptions_GetEndCapStyle( void ) : string；官方摘要：Will return the name of the currently set EndCap Style.； NULL on failure.
69	BufferOptions_SetJoinStyle	空间 SQL 支撑函数	语法：BufferOptions_SetJoinStyle( style Text ) : boolean；官方摘要：Will set the current Join Style. Accepted styles ( case insensitive ) are: ROUND , MITRE or MITER , BEVEL ； Returns TRUE on success, FALSE on failure.
70	BufferOptions_GetJoinStyle	空间 SQL 支撑函数	语法：BufferOptions_GetJoinStyle( void ) : string；官方摘要：Will return the name of the currently set Join Style.； NULL on failure.
71	BufferOptions_SetMitreLimit	空间 SQL 支撑函数	语法：BufferOptions_SetMitreLimit( limit Double ) : boolean；官方摘要：Will set the current Mitre Limit value.； Returns TRUE on success, FALSE on failure.
72	BufferOptions_GetMitreLimit	空间 SQL 支撑函数	语法：BufferOptions_GetMitreLimit( void ) : double；官方摘要：Will return the value of the currently set Mitre Limit.； NULL on failure.
73	BufferOptions_SetQuadrantSegments	空间 SQL 支撑函数	语法：BufferOptions_SetQuadrantSegments( points Integer ) : boolean；官方摘要：Will set the current Quadrant Segments value.； Returns TRUE on success, FALSE on failure.
74	BufferOptions_GetQuadrantSegments	空间 SQL 支撑函数	语法：BufferOptions_GetQuadrantSegments( void ) : integer；官方摘要：Will return the value of the currently set Quadrant Segments.； NULL on failure.

9.4 SQL functions manipulating Sequences

序号	函数名	函数功能	详细说明
75	sequence_nextval	序列值管理	语法：sequence_nextval ( seq_name Text ) : Integer；官方摘要：advances to the next value of the Sequence, which is then returned.； Will return NULL if any error occurred.
76	sequence_currval	序列值管理	语法：sequence_currval ( seq_name Text ) : Integer；官方摘要：returns the value most recently obtained by sequence_nextval() for the Sequence identified by seq_name ； Will return NULL if the Sequence identified by seq_name has not yet been...
77	sequence_lastval	序列值管理	语法：sequence_lastval ( void ) : Integer；官方摘要：returns the value most recently obtained by sequence_nextval() ； Will return NULL if sequence_nextval() has not yet been used.
78	sequence_setval	序列值管理	语法：sequence_setval ( seq_name Text , value Integer ) : Integer；官方摘要：sets the current value for the Sequence identified by seq_name ; if the Sequence doesn't yet exist it will be created on-the-fly.； Will return value on success or NULL on failure.

9.5 SQL math functions

序号	函数名	函数功能	详细说明
79	Abs	数学运算	语法：Abs( x Double precision ) : Double precision；官方摘要：returns the absolute value of x
80	Acos	数学运算	语法：Acos( x Double precision ) : Double precision；官方摘要：returns the arc cosine of x , that is, the value whose cosine is x ； returns NULL if x is not within the range -1 to 1
81	Asin	数学运算	语法：Asin( x Double precision ) : Double precision；官方摘要：returns the arc sine of x , that is, the value whose sine is x ； returns NULL if x is not in the range -1 to 1
82	Atan	数学运算	语法：Atan( x Double precision ) : Double precision；官方摘要：returns the arc tangent of x , that is, the value whose tangent is x
83	Atan2	数学运算	语法：Atan2( y Double precision , x Double precision ) : Double precision；官方摘要：returns the principal value of the arc tangent of y/x in radians, using the signs of the two arguments to determine the quadrant of the result. The return value is in the range[...
84	Ceil；Ceiling	数学运算	语法：Ceil( x Double precision ) : Double precision ； Ceiling( x Double precision ) : Double precision；官方摘要：returns the smallest integer value not less than x
85	Cos	数学运算	语法：Cos( x Double precision ) : Double precision；官方摘要：returns the cosine of x , where x is given in radians
86	Cot	数学运算	语法：Cot( x Double precision ) : Double precision；官方摘要：returns the cotangent of x , where x is given in radians
87	Degrees	数学运算	语法：Degrees( x Double precision ) : Double precision；官方摘要：returns the argument x , converted from radians to degrees
88	Exp	数学运算	语法：Exp( x Double precision ) : Double precision；官方摘要：returns the value of e (the base of natural logarithms) raised to the power of x ； the inverse of this function is Log() (using a single argument only) or Ln()
89	Floor	数学运算	语法：Floor( x Double precision ) : Double precision；官方摘要：returns the largest integer value not greater than x
90	Ln / Log	数学运算	语法：Ln( x Double precision ) : Double precision ； Log( x Double precision ) : Double precision；官方摘要：returns the natural logarithm of x ; that is, the base- e logarithm of x ； If x is less than or equal to 0, then NULL is returned
91	Log	数学运算	语法：Log( x Double precision , b Double precision ) : Double precision；官方摘要：returns the logarithm of x to the base b ； If x is less than or equal to 0, or if b is less than or equal to 1, then NULL is returned； Log(x, b) is equivalent to Log(x) / Log(b)
92	Log2	数学运算	语法：Log2( x Double precision ) : Double precision；官方摘要：returns the base-2 logarithm of x ； Log2(x) is equivalent to Log(x) / Log(2)
93	Log10	数学运算	语法：Log10( x Double precision ) : Double precision；官方摘要：returns the base-10 logarithm of x ； Log10(x) is equivalent to Log(x) / Log(10)
94	PI	数学运算	语法：PI( void ) : Double precision；官方摘要：returns the value of PI
95	Pow / Power	数学运算	语法：Pow( x Double precision , y Double precision ) : Double precision ； Power( x Double precision , y Double precision ) : Double precision；官方摘要：returns the value of x raised to the power of y
96	Radians	数学运算	语法：Radians( x Double precision ) : Double precision；官方摘要：returns the argument x , converted from degrees to radians
97	Sign	数学运算	语法：Sign( x Double precision ) : Double precision；官方摘要：returns the sign of the argument as -1, 0, or 1, depending on whether x is negative, zero, or positive.
98	Sin	数学运算	语法：Sin( x Double precision ) : Double precision；官方摘要：returns the sine of x , where x is given in radians
99	Sqrt	数学运算	语法：Sqrt( x Double precision ) : Double precision；官方摘要：returns the square root of a non-negative number x
100	Stddev_pop	数学运算	语法：Stddev_pop( x Double precision ) : Double precision；官方摘要：returns the population standard deviation of the input values； aggregate function
101	Stddev_samp	数学运算	语法：Stddev_samp( x Double precision ) : Double precision；官方摘要：returns the sample standard deviation of the input values； aggregate function
102	Tan	数学运算	语法：Tan( x Double precision ) : Double precision；官方摘要：returns the tangent of x , where x is given in radians
103	Var_pop	数学运算	语法：Var_pop( x Double precision ) : Double precision；官方摘要：returns the population variance of the input values ( square of the population standard deviation )； aggregate function
104	Var_samp	数学运算	语法：Var_samp( x Double precision ) : Double precision；官方摘要：returns the sample variance of the input values ( square of the sample standard deviation )； aggregate function

9.6 SQL functions reporting PROJ / GEOS / RTTOPO errors and warnings

序号	函数名	函数功能	详细说明
105	PROJ_GetLastErrorMsg	底层模块错误和警告读取	语法：PROJ_GetLastErrorMsg( void ) : String；官方摘要：PROJ；Will return the most recent error message returned by PROJ (if any).； NULL will be returned if there is no pending PROJ error.； Note : this SQL function will be available o...
106	GEOS_GetLastWarningMsg	底层模块错误和警告读取	语法：GEOS_GetLastWarningMsg( void ) : String；官方摘要：GEOS；Will return the most recent warning message returned by GEOS (if any).； NULL will be returned if there is no pending GEOS warning.
107	GEOS_GetLastErrorMsg	底层模块错误和警告读取	语法：GEOS_GetLastErrorMsg( void ) : String；官方摘要：GEOS；Will return the most recent error message returned by GEOS (if any).； NULL will be returned if there is no pending GEOS error.
108	GEOS_GetLastAuxErrorMsg	底层模块错误和警告读取	语法：GEOS_GetLastAuxErrorMsg( void ) : String；官方摘要：GEOS；Will return the most recent error message (auxiliary) returned by GEOS (if any).； NULL will be returned if there is no pending GEOS (auxiliary) error.
109	GEOS_GetCriticalPointFromMsg	底层模块错误和警告读取	语法：GEOS_GetCriticalPointFromMsg( void ) : Point ； GEOS_GetCriticalPointFromMsg( SRID Integer ) : Point；官方摘要：GEOS；Will (possibly) return a Point Geometry extracted from the latest error / warning message returned by GEOS.； NULL will be returned if there is no pending GEOS message, or i...
110	RTTOPO_GetLastWarningMsg	底层模块错误和警告读取	语法：RTTOPO_GetLastWarningMsg( void ) : String；官方摘要：RTTOPO；Will return the most recent warning message returned by RTTOPO (if any).； NULL will be returned if there is no pending RTTOPO warning.
111	RTTOPO_GetLastErrorMsg	底层模块错误和警告读取	语法：RTTOPO_GetLastErrorMsg( void ) : String；官方摘要：RTTOPO；Will return the most recent error message returned by RTTOPO (if any).； NULL will be returned if there is no pending RTTOPO error.

9.7 SQL length/distance unit-conversion functions

序号	函数名	函数功能	详细说明
112	Kilometer	长度与距离单位换算	语法：CvtToKm( x Double precision ) : Double precision ； CvtFromKm( x Double precision ) : Double precision；官方摘要：meters / kilometers
113	Decimeter	长度与距离单位换算	语法：CvtToDm( x Double precision ) : Double precision ； CvtFromDm( x Double precision ) : Double precision；官方摘要：meters / decimeters
114	Centimeter	长度与距离单位换算	语法：CvtToCm( x Double precision ) : Double precision ； CvtFromCm( x Double precision ) : Double precision；官方摘要：meters / centimeters
115	Millimeter	长度与距离单位换算	语法：CvtToMm( x Double precision ) : Double precision ； CvtFromMm( x Double precision ) : Double precision；官方摘要：meters / millimeters
116	International Nautical Mile	长度与距离单位换算	语法：CvtToKmi( x Double precision ) : Double precision ； CvtFromKmi( x Double precision ) : Double precision；官方摘要：meters / international nautical miles
117	International Inch	长度与距离单位换算	语法：CvtToIn( x Double precision ) : Double precision ； CvtFromIn( x Double precision ) : Double precision；官方摘要：meters / international inches
118	International Foot	长度与距离单位换算	语法：CvtToFt( x Double precision ) : Double precision ； CvtFromFt( x Double precision ) : Double precision；官方摘要：meters / international feet
119	International Yard	长度与距离单位换算	语法：CvtToYd( x Double precision ) : Double precision ； CvtFromYd( x Double precision ) : Double precision；官方摘要：meters / international yards
120	International Statute Mile	长度与距离单位换算	语法：CvtToMi( x Double precision ) : Double precision ； CvtFromMi( x Double precision ) : Double precision；官方摘要：meters / international statute miles
121	International Fathom	长度与距离单位换算	语法：CvtToFath( x Double precision ) : Double precision ； CvtFromFath( x Double precision ) : Double precision；官方摘要：meters / international fathoms
122	International Chain	长度与距离单位换算	语法：CvtToCh( x Double precision ) : Double precision ； CvtFromCh( x Double precision ) : Double precision；官方摘要：meters / international chains
123	International Link	长度与距离单位换算	语法：CvtToLink( x Double precision ) : Double precision ； CvtFromLink( x Double precision ) : Double precision；官方摘要：meters / international links
124	U.S. Inch	长度与距离单位换算	语法：CvtToUsIn( x Double precision ) : Double precision ； CvtFromUsIn( x Double precision ) : Double precision；官方摘要：meters / U.S. inches
125	U.S. Foot	长度与距离单位换算	语法：CvtToUsFt( x Double precision ) : Double precision ； CvtFromUsFt( x Double precision ) : Double precision；官方摘要：meters / U.S. feet
126	U.S. Yard	长度与距离单位换算	语法：CvtToUsYd( x Double precision ) : Double precision ； CvtFromUsYd( x Double precision ) : Double precision；官方摘要：meters / U.S. yards
127	U.S. Statute Mile	长度与距离单位换算	语法：CvtToUsMi( x Double precision ) : Double precision ； CvtFromUsMi( x Double precision ) : Double precision；官方摘要：meters / U.S. statute miles
128	U.S. Chain	长度与距离单位换算	语法：CvtToUsCh( x Double precision ) : Double precision ； CvtFromUsCh( x Double precision ) : Double precision；官方摘要：meters / U.S. chains
129	Indian Foot	长度与距离单位换算	语法：CvtToIndFt( x Double precision ) : Double precision ； CvtFromIndFt( x Double precision ) : Double precision；官方摘要：meters / indian feet
130	Indian Yard	长度与距离单位换算	语法：CvtToIndYd( x Double precision ) : Double precision ； CvtFromIndYd( x Double precision ) : Double precision；官方摘要：meters / indian yards
131	Indian Chain	长度与距离单位换算	语法：CvtToIndCh( x Double precision ) : Double precision ； CvtFromIndCh( x Double precision ) : Double precision；官方摘要：meters / indian chains

9.8 SQL conversion functions from DD/DMS notations (longitude/latitude)

序号	函数名	函数功能	详细说明
132	DD to DMS	经纬度 DD/DMS 格式换算	语法：LongLatToDMS( longitude Double precision , latitude Double precision ) : String ； LongLatToDMS( longitude Double precision , latitude Double precision , decimal_digits Integer ) : String；官方摘要：官方页面未提供摘要，请以 Syntax 和原文说明为准。
133	DMS to DD	经纬度 DD/DMS 格式换算	语法：LongitudeFromDMS( dms_expression String ) : Double precision ； LatitudeFromDMS( dms_expression String ) : Double precision；官方摘要：官方页面未提供摘要，请以 Syntax 和原文说明为准。

9.9 SQL utility functions for BLOB objects

序号	函数名	函数功能	详细说明
134	IsZipBlob	BLOB 类型识别和文件读写	语法：IsZipBlob( content BLOB ) : Integer；官方摘要：The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL or non-BLOB argument.； TRUE if this BLOB object correspond...
135	IsPdfBlob	BLOB 类型识别和文件读写	语法：IsPdfBlob( content BLOB ) : Integer；官方摘要：The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL or non-BLOB argument.； TRUE if this BLOB object correspond...
136	IsGifBlob	BLOB 类型识别和文件读写	语法：IsGifBlob( image BLOB ) : Integer；官方摘要：The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL or non-BLOB argument.； TRUE if this BLOB object correspond...
137	IsPngBlob	BLOB 类型识别和文件读写	语法：IsPngBlob( image BLOB ) : Integer；官方摘要：The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL or non-BLOB argument.； TRUE if this BLOB object correspond...
138	IsTiffBlob	BLOB 类型识别和文件读写	语法：IsTiffBlob( image BLOB ) : Integer；官方摘要：The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL or non-BLOB argument.； TRUE if this BLOB object correspond...
139	IsJpegBlob	BLOB 类型识别和文件读写	语法：IsJpegBlob( image BLOB ) : Integer；官方摘要：The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL or non-BLOB argument.； TRUE if this BLOB object correspond...
140	IsExifBlob	BLOB 类型识别和文件读写	语法：IsExifBlob( image BLOB ) : Integer；官方摘要：The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL or non-BLOB argument.； TRUE if this BLOB object correspond...
141	IsExifGpsBlob	BLOB 类型识别和文件读写	语法：IsExifGpsBlob( image BLOB ) : Integer；官方摘要：The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL or non-BLOB argument.； TRUE if this BLOB object correspond...
142	IsWebpBlob	BLOB 类型识别和文件读写	语法：IsWebpBlob( image BLOB ) : Integer；官方摘要：The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL or non-BLOB argument.； TRUE if this BLOB object correspond...
143	IsJP2Blob	BLOB 类型识别和文件读写	语法：IsJP2Blob( image BLOB ) : Integer；官方摘要：The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL or non-BLOB argument.； TRUE if this BLOB object correspond...
144	GetMimeType	BLOB 类型识别和文件读写	语法：GetMimeType( payload BLOB ) : String；官方摘要：The return type is Text, and could be one of: image/gif , image/png , image/jpeg , image/jp2 , image/tiff , image/svg+xml , application/xml , application/zip , application/pdf ...
145	IsGeometryBlob	BLOB 类型识别和文件读写	语法：IsGeometryBlob( content BLOB ) : Integer；官方摘要：The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL or non-BLOB argument.； TRUE if the BLOB argument is a vali...
146	IsCompressedGeometryBlob	BLOB 类型识别和文件读写	语法：IsCompressedGeometryBlob( content BLOB ) : Integer；官方摘要：The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL or non-BLOB argument.； TRUE if the BLOB argument is a vali...
147	IsTinyPointBlob	BLOB 类型识别和文件读写	语法：IsTinyPointBlob( content BLOB ) : Integer；官方摘要：The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL or non-BLOB argument.； TRUE if the BLOB argument is a vali...
148	TinyPointEncode	BLOB 类型识别和文件读写	语法：TinyPointEncode( content POINT BLOB-GEOMETRY ) : BLOB-TinyPoint；官方摘要：If the input argument corresponds to a valid BLOB-GEOMETRY of the POINT , POINT Z , POINT M or POINT ZM type the corresponding BLOB-TinyPoint will be returned.； In any other cas...
149	GeometryPointEncode	BLOB 类型识别和文件读写	语法：GeometryPointEncode( content BLOB-TinyPoint ) : BLOB-GEOMETRY；官方摘要：If the input argument corresponds to a valid BLOB-TinyPoint the corresponding BLOB-GEOMETRY will be returned.； In any other case the input argument will be retuned.
150	BlobFromFile	BLOB 类型识别和文件读写	语法：BlobFromFile( filepath String ) : BLOB；官方摘要：If the filepath is valid, and the existing file can be successfully read, then the whole file content will be returned as a BLOB value.； Otherwise NULL will be returned.； Please...
151	BlobToFile	BLOB 类型识别和文件读写	语法：BlobToFile( binary-data BLOB , filepath String ) : Integer；官方摘要：If binary-data is of the BLOB-type, and the filepath is valid (i.e. accessible in write/create mode), then the corresponding file will be created/overwritten with the binary-dat...
152	CountUnsafeTriggers	BLOB 类型识别和文件读写	语法：CountUnsafeTriggers( ) : Integer；官方摘要：This SQL function checks if the currently connected DB contains any potentially malicious Triggers; carefully checking this conditions is a minimal precaution expected to be alw...

9.10 SQL utility functions non-standard for geometric objects

序号	函数名	函数功能	详细说明
153	GeomFromExifGpsBlob	空间 SQL 支撑函数	语法：GeomFromExifGpsBlob( image BLOB ) : Geometry；官方摘要：base；a POINT Geometry will be returned representing the GPS long/lat contained within EXIF-GPS metadata for the BLOB image； NULL will be returned if for any reason it's not poss...
154	ST_Point	空间 SQL 支撑函数	语法：ST_Point( x Double precision , y Double precision ) : Geometry；官方摘要：base；simply an alias-name for MakePoint() ； Please note : the SRID argument is never supported by ST_Point()
155	MakePoint	空间 SQL 支撑函数	语法：MakePoint( x Double precision , y Double precision , , SRID Integer ) : Geometry；官方摘要：base；a Geometry will be returned representing the POINT defined by x y coordinates
156	MakePointZ	空间 SQL 支撑函数	语法：MakePointZ( x Double precision , y Double precision , z Double precision , , SRID Integer ) : Geometry；官方摘要：base；a Geometry will be returned representing the POINT Z defined by x y z coordinates
157	MakePointM	空间 SQL 支撑函数	语法：MakePointM( x Double precision , y Double precision , m Double precision , , SRID Integer ) : Geometry；官方摘要：base；a Geometry will be returned representing the POINT M defined by x y m coordinates
158	MakePointZM	空间 SQL 支撑函数	语法：MakePointZM( x Double precision , y Double precision , z Double precision , m Double precision , SRID Integer ) : Geometry；官方摘要：base；a Geometry will be returned representing the POINT ZM defined by x y z m coordinates
159	MakeLine	空间 SQL 支撑函数	语法：MakeLine( pt1 PointGeometry , pt2 PointGeometry ) : LinestringGeometry；官方摘要：base；a Linestring Geometry will be returned representing the segment connecting pt1 to pt2 ； NULL will be returned if any error is encountered
160	MakeLine	空间 SQL 支撑函数	语法：MakeLine( geom PointGeometry ) : LinestringGeometry；官方摘要：base；a Linestring Geometry will be returned connecting all the input Points (accordingly to input sequence)； aggregate function ； NULL will be returned if any error is encountered
161	MakeLine	空间 SQL 支撑函数	语法：MakeLine( geom MultiPointGeometry , direction Boolean ) : LinestringGeometry；官方摘要：base；a Linestring Geometry will be returned connecting all the input Points (accordingly to input sequence); direction=FALSE implies reverse order .； Please note : similar to th...
162	MakeCircle	空间 SQL 支撑函数	语法：MakeCircle( cx Double precision , cy Double precision , radius Double precision , SRID Integer \[ , step Double precision ] ) : Geometry；官方摘要：base；will return a closed LINESTRING approximating the Circle defined by cx, cy and radius .； The optional argument step if specified defines how many points will be interpolate...
163	MakeEllipse	空间 SQL 支撑函数	语法：MakeEllipse( cx Double precision , cy Double precision , x_axis Double precision , y_axis Double precision , SRID Integer \[ , step Double precision ] ) : Geometry；官方摘要：base；will return a closed LINESTRING approximating the Ellipse defined by cx, cy and x_axis, y_axis .； The optional argument step if specified defines how many points will be in...
164	MakeArc	空间 SQL 支撑函数	语法：MakeArc( cx Double precision , cy Double precision , radius Double precision , start Double precision , stop Double precision , SRID Integer \[ , step Double precision ] ) : Geometry；官方摘要：base；will return a LINESTRING approximating the Circular Arc defined by cx, cy and radius ; the arc's extremities will be defined by start, stop angles expressed in degrees.； Th...
165	MakeEllipticArc	空间 SQL 支撑函数	语法：MakeEllipticArc( cx Double precision , cy Double precision , x_axis Double precision , y_axis Double precision , start Double precision , stop Double precision , SRID Integer \[ , step Double precision ] ) : Geometry；官方摘要：base；will return a LINESTRING approximating the Elliptic Arc defined by cx, cy and x_axis, y_axis ; the arc's extremities will be defined by start, stop angles expressed in degr...
166	MakeCircularSector	空间 SQL 支撑函数	语法：MakeCircularSector( cx Double precision , cy Double precision , radius Double precision , start Double precision , stop Double precision , SRID Integer \[ , step Double precision ] ) : Geometry；官方摘要：base；will return a POLYGON approximating the Circular Sector defined by cx, cy and radius ; the arc's extremities will be defined by start, stop angles expressed in degrees.； Th...
167	MakeEllipticSector	空间 SQL 支撑函数	语法：MakeEllipticSector( cx Double precision , cy Double precision , x_axis Double precision , y_axis Double precision , start Double precision , stop Double precision , SRID Integer \[ , step Double precision ] ) : Geo...；官方摘要：base；will return a POLYGON approximating the Elliptic Sector defined by cx, cy and x_axis, y_axis ; the arc's extremities will be defined by start, stop angles expressed in degr...
168	MakeCircularStripe	空间 SQL 支撑函数	语法：MakeCircularStripe( cx Double precision , cy Double precision , radius_1 Double precision , radius_2 Double precision , start Double precision , stop Double precision , SRID Integer \[ , step Double precision ] ) :...；官方摘要：base；will return a POLYGON approximating the Circular Stripe delimited by two arcs sharing the same Centre cx , cy but having different radii radius_1 , radius_2 ; the ar...
169	SquareGrid	空间 SQL 支撑函数	语法：SquareGrid( geom ArealGeometry , size Double precision , mode Integer , \[ origin PointGeometry ] ) : Geometry ； ST_SquareGrid( geom ArealGeometry , size Double precision , mode Integer , \[ origin PointGeometry ...；官方摘要：GEOS；return a grid of square cells (having the edge length of size ) precisely covering the input Geometry.； The specific Type of returned Geometry is controlled by the mode att...
170	TriangularGrid	空间 SQL 支撑函数	语法：TriangularGrid( geom ArealGeometry , size Double precision , mode Integer , \[ origin PointGeometry ] ) : Geometry ； ST_TriangularGrid( geom ArealGeometry , size Double precision [ , mode Integer , [ origin PointGe...；官方摘要：GEOS；return a grid of triangular cells (having the edge length of size ) precisely covering the input Geometry.； The specific Type of returned Geometry is controlled by the mode...
171	HexagonalGrid	空间 SQL 支撑函数	语法：HexagonalGrid( geom ArealGeometry , size Double precision , mode Integer , \[ origin PointGeometry ] ) : Geometry ； ST_HexagonalGrid( geom ArealGeometry , size Double precision [ , mode Integer , [ origin PointGeom...；官方摘要：GEOS；return a grid of hexagonal cells (having the edge length of size ) precisely covering the input Geometry.； The specific Type of returned Geometry is controlled by the mode ...
172	BuildMbr	空间 SQL 支撑函数	语法：BuildMbr( x1 Double precision , y1 Double precision , x2 Double precision , y2 Double precision , SRID Integer ) : Geometry；官方摘要：base； x1 y1 and x2 y2 are assumed to be Points identifying a line segment; then a Geometry will be returned representing the MBR for this line segment
173	BuildCircleMbr	空间 SQL 支撑函数	语法：BuildCircleMbr( x Double precision , y Double precision , radius Double precision , SRID Integer ) : Geometry；官方摘要：base； x y is assumed to be the center of a circle of given radius ; then a Geometry will be returned representing the MBR for this circle
174	Extent	空间 SQL 支撑函数	语法：Extent( geom Geometry ) : Geometry；官方摘要：base；return a geometric object representing the bounding box that encloses a set of input values； aggregate function
175	ToGARS	空间 SQL 支撑函数	语法：ToGARS( geom Geometry ) : String；官方摘要：base；geom is expected to represent a POINT (longitude and latitude coordinates); the corresponding GARS area designation code will be returned.； NULL will be returned if any err...
176	GARSMbr	空间 SQL 支撑函数	语法：GARSMbr( code String ) : Geometry；官方摘要：base；code is assumed to represent a valid GARS area designation code; a Geometry will be returned representing the MBR for the corresponding GARS area.； NULL will be returned if...
177	MbrMinX	空间 SQL 支撑函数	语法：MbrMinX( geom Geometry ) : Double precision ； ST_MinX( geom Geometry ) : Double precision；官方摘要：base；return the x-coordinate for geom MBR's leftmost side as a double precision number.； NULL will be returned if geom isn't a valid Geometry.
178	MbrMinY	空间 SQL 支撑函数	语法：MbrMinY( geom Geometry ) : Double precision ； ST_MinY( geom Geometry ) : Double precision；官方摘要：base；return the y-coordinate for geom MBR's lowermost side as a double precision number.； NULL will be returned if geom isn't a valid Geometry.
179	MbrMaxX	空间 SQL 支撑函数	语法：MbrMaxX( geom Geometry ) : Double precision ； ST_MaxX( geom Geometry ) : Double precision；官方摘要：base；return the x-coordinate for geom MBR's rightmost side as a double precision number.； NULL will be returned if geom isn't a valid Geometry.
180	MbrMaxY	空间 SQL 支撑函数	语法：MbrMaxY( geom Geometry ) : Double precision ； ST_MaxY( geom Geometry ) : Double precision；官方摘要：base；return the y-coordinate for geom MBR's uppermost side as a double precision number.； NULL will be returned if geom isn't a valid Geometry.
181	MinZ	空间 SQL 支撑函数	语法：ST_MinZ( geom Geometry ) : Double precision ； ST_MinZ( geom Geometry , nodata-value Double ) : Double precision；官方摘要：base；return the minimum Z-coordinate value for geom as a double precision number. if the optional argument nodata-value is set, then any NODATA value eventually found will be ig...
182	MaxZ	空间 SQL 支撑函数	语法：ST_MaxZ( geom Geometry ) : Double precision ； ST_MaxZ( geom Geometry , nodata-value Double ) : Double precision；官方摘要：base；return the maximum Z-coordinate value for geom as a double precision number. if the optional argument nodata-value is set, then any NODATA value eventually found will be ig...
183	MinM	空间 SQL 支撑函数	语法：ST_MinM( geom Geometry ) : Double precision ； ST_MinM( geom Geometry , nodata-value Double ): Double precision；官方摘要：base；return the minimum M-coordinate value for geom as a double precision number. if the optional argument nodata-value is set, then any NODATA value eventually found will be ig...
184	MaxM	空间 SQL 支撑函数	语法：ST_MaxM( geom Geometry ) : Double precision ； ST_MaxM( geom Geometry , nodata-value Double ) : Double precision；官方摘要：base；return the maximum M-coordinate value for geom as a double precision number. if the optional argument nodata-value is set, then any NODATA value eventually found will be ig...

9.11 SQL functions for constructing a geometric object given its Well-known Text Representation

序号	函数名	函数功能	详细说明
185	GeomFromText	从 WKT 构造 Geometry	语法：GeomFromText( wkt String , SRID Integer ) : Geometry ； ST_GeomFromText( wkt String , SRID Integer ) : Geometry；官方摘要：X；base；construct a geometric object given its Well-known text Representation
186	ST_WKTToSQL	从 WKT 构造 Geometry	语法：ST_WKTToSQL( wkt String ) : Geometry；官方摘要：base；SQL/MM compliant: simply an alias name for ST_GeomFromText ； Please note : SRID=0 is always assumed.
187	PointFromText	从 WKT 构造 Geometry	语法：PointFromText( wktPoint String , SRID Integer ) : Point ； ST_PointFromText( wktPoint String , SRID Integer ) : Point；官方摘要：X；base；construct a Point
188	LineFromText / LineStringFromText	从 WKT 构造 Geometry	语法：LineFromText( wktLineString String , SRID Integer ) : Linestring ； ST_LineFromText( wktLineString String , SRID Integer ) : Linestring ； LineStringFromText( wktLineString String , SRID Integer ) : Linestri...；官方摘要：X；base；construct a Linestring
189	PolyFromText / PolygonFromText	从 WKT 构造 Geometry	语法：PolyFromText( wktPolygon String , SRID Integer ) : Polygon ； ST_PolyFromText( wktPolygon String , SRID Integer ) : Polygon ； PolygonFromText( wktPolygon String , SRID Integer ) : Polygon ； ST_PolygonFromTe...；官方摘要：X；base；construct a Polygon
190	MPointFromText / MultiPointFromText	从 WKT 构造 Geometry	语法：MPointFromText( wktMultiPoint String , SRID Integer ) : MultiPoint ； ST_MPointFromText( wktMultiPoint String , SRID Integer ) : MultiPoint ； MultiPointFromText( wktMultiPoint String , SRID Integer ) : Mult...；官方摘要：X；base；construct a MultiPoint
191	MLineFromText / MultiLineStringFromText	从 WKT 构造 Geometry	语法：MLineFromText( wktMultiLineString String , SRID Integer ) : MultiLinestring ； ST_MLineFromText( wktMultiLineString String , SRID Integer ) : MultiLinestring ； MultiLineStringFromText( wktMultiLineString String...；官方摘要：X；base；construct a MultiLinestring
192	MPolyFromText / MultiPolygonFromText	从 WKT 构造 Geometry	语法：MPolyFromText( wktMultiPolygon String , SRID Integer ) : MultiPolygon ； ST_MPolyFromText( wktMultiPolygon String , SRID Integer ) : MultiPolygon ； MultiPolygonFromText( wktMultiPolygon String [ , SRID Integer ...；官方摘要：X；base；construct a MultiPolygon
193	GeomCollFromText / GeometryCollectionFromText	从 WKT 构造 Geometry	语法：GeomCollFromText( wktGeometryCollection String , SRID Integer ) : GeometryCollection ； ST_GeomCollFromText( wktGeometryCollection String , SRID Integer ) : GeometryCollection ； GeometryCollectionFromText( wktG...；官方摘要：X；base；construct a GeometryCollection
194	BdPolyFromText	从 WKT 构造 Geometry	语法：BdPolyFromText( wktMultilinestring String , SRID Integer ) : Polygon ； ST_BdPolyFromText( wktMultilinestring String , SRID Integer ) : Polygon；官方摘要：X；GEOS；Construct a Polygon given an arbitrary collection of closed linestrings as a MultiLineString text representation. ； see also : BuildArea() , Polygonize()
195	BdMPolyFromText	从 WKT 构造 Geometry	语法：BdMPolyFromText( wktMultilinestring String , SRID Integer ) : MultiPolygon ； ST_BdMPolyFromText( wktMultilinestring String , SRID Integer ) : MultiPolygon；官方摘要：X；GEOS；Construct a MultiPolygon given an arbitrary collection of closed linestrings as a MultiLineString text representation. ； see also : BuildArea() , Polygonize()

9.12 SQL functions for constructing a geometric object given its Well-known Binary Representation

序号	函数名	函数功能	详细说明
196	GeomFromWKB	从 WKB 构造 Geometry	语法：GeomFromWKB( wkbGeometry Binary , SRID Integer ) : Geometry ； ST_GeomFromWKB( wkbGeometry Binary , SRID Integer ) : Geometry；官方摘要：X；base；construct a geometric object given its Well-known binary Representation
197	ST_WKBToSQL	从 WKB 构造 Geometry	语法：ST_WKBToSQL( wkbGeometry Binary ) : Geometry；官方摘要：base；SQL/MM compliant: simply an alias name for ST_GeomFromWKB ； Please note : SRID=0 is always assumed.
198	PointFromWKB	从 WKB 构造 Geometry	语法：PointFromWKB( wkbPoint Binary , SRID Integer ) : Point ； ST_PointFromWKB( wkbPoint Binary , SRID Integer ) : Point；官方摘要：X；base；construct a Point
199	LineFromWKB / LineStringFromWKB	从 WKB 构造 Geometry	语法：LineFromWKB( wkbLineString Binary , SRID Integer ) : Linestring ； ST_LineFromWKB( wkbLineString Binary , SRID Integer ) : Linestring ； LineStringFromText( wkbLineString Binary , SRID Integer ) : Linestring...；官方摘要：X；base；construct a Linestring
200	PolyFromWKB / PolygonFromWKB	从 WKB 构造 Geometry	语法：PolyFromWKB( wkbPolygon Binary , SRID Integer ) : Polygon ； ST_PolyFromWKB( wkbPolygon Binary , SRID Integer ) : Polygon ； PolygonFromWKB( wkbPolygon Binary , SRID Integer ) : Polygon ； ST_PolygonFromWKB( ...；官方摘要：X；base；construct a Polygon
201	MPointFromWKB / MultiPointFromWKB	从 WKB 构造 Geometry	语法：MPointFromWKB( wkbMultiPoint Binary , SRID Integer ) : MultiPoint ； ST_MPointFromWKB( wkbMultiPoint Binary , SRID Integer ) : MultiPoint ； MultiPointFromWKB( wkbMultiPoint Binary , SRID Integer ) : MultiPo...；官方摘要：X；base；construct a MultiPoint
202	MLineFromWKB / MultiLineStringFromWKB	从 WKB 构造 Geometry	语法：MLineFromWKB( wkbMultiLineString Binary , SRID Integer ) : MultiLinestring ； ST_MLineFromWKB( wkbMultiLineString Binary , SRID Integer ) : MultiLinestring ； MultiLineStringFromWKB( wkbMultiLineString Binary [ ...；官方摘要：X；base；construct a MultiLinestring
203	MPolyFromWKB / MultiPolygonFromWKB	从 WKB 构造 Geometry	语法：MPolyFromWKB( wkbMultiPolygon Binary , SRID Integer ) : MultiPolygon ； ST_MPolyFromWKB( wkbMultiPolygon Binary , SRID Integer ) : MultiPolygon ； MultiPolygonFromWKB( wkbMultiPolygon Binary , SRID Integer )...；官方摘要：X；base；construct a MultiPolygon
204	GeomCollFromWKB / GeometryCollectionFromWKB	从 WKB 构造 Geometry	语法：GeomCollFromWKB( wkbGeometryCollection Binary , SRID Integer ) : GeometryCollection ； ST_GeomCollFromWKB( wkbGeometryCollection Binary , SRID Integer ) : GeometryCollection ； GeometryCollectionFromWKB( wkbGeom...；官方摘要：X；base；construct a GeometryCollection
205	BdPolyFromWKB	从 WKB 构造 Geometry	语法：BdPolyFromWKB( wkbMultilinestring Binary , SRID Integer ) : Polygon ； ST_BdPolyFromWKB( wkbMultilinestring Binary , SRID Integer ) : Polygon；官方摘要：X；GEOS；Construct a Polygon given an arbitrary collection of closed linestrings as a MultiLineString binary representation. ； see also : BuildArea() , Polygonize()
206	BdMPolyFromWKB	从 WKB 构造 Geometry	语法：BdMPolyFromWKB( wkbMultilinestring Binary , SRID Integer ) : MultiPolygon ； ST_BdMPolyFromWKB( wkbMultilinestring Binary , SRID Integer ) : MultiPolygon；官方摘要：X；GEOS；Construct a MultiPolygon given an arbitrary collection of closed linestrings as a MultiLineString binary representation. ； see also : BuildArea() , Polygonize()

9.13 SQL functions for obtaining the Well-known Text / Well-known Binary Representation of a geometric object

序号	函数名	函数功能	详细说明
207	AsText	从 WKT 构造 Geometry	语法：AsText( geom Geometry ) : String ； ST_AsText( geom Geometry ) : String；官方摘要：X；base；returns the Well-known Text representation
208	AsWKT	从 WKT 构造 Geometry	语法：AsWKT( geom Geometry , precision Integer ) : String；官方摘要：base；returns the Well-known Text representation；always return strictly conformant 2D WKT
209	AsBinary	从 WKT 构造 Geometry	语法：AsBinary( geom Geometry ) : Binary ； ST_AsBinary( geom Geometry ) : Binary；官方摘要：X；base；returns the Well-known Binary representation

9.14 SQL functions supporting exotic geometric formats

序号	函数名	函数功能	详细说明
210	AsSVG	KML、GML、GeoJSON、SVG 等格式互操作	语法：AsSVG( geom Geometry , relative Integer \[ , precision Integer ] ) : String；官方摘要：base；returns the SVG Scalable Vector Graphics representation
211	AsKml	KML、GML、GeoJSON、SVG 等格式互操作	语法：AsKml( geom Geometry , precision Integer ) : String ； AsKml( name String , description String , geom Geometry , precision Integer ) : String；官方摘要：PROJ；returns the KML Keyhole Markup Language representation； The first form will simply generate the geometry element: the second form will generate a complete KML entity
212	GeomFromKml	KML、GML、GeoJSON、SVG 等格式互操作	语法：GeomFromKml( KmlGeometry String ) : Geometry；官方摘要：base；construct a geometric object given its KML Representation
213	AsGml	KML、GML、GeoJSON、SVG 等格式互操作	语法：AsGml( geom Geometry , precision Integer ) : String ； AsGml( version Integer , geom Geometry , precision Integer ) : String；官方摘要：base；returns the GML Geography Markup Language representation； If version = 3 than GML 3.x is generated, otherwise the output format will be GML 2.x
214	GeomFromGML	KML、GML、GeoJSON、SVG 等格式互操作	语法：GeomFromGML( gmlGeometry String ) : Geometry；官方摘要：base；construct a geometric object given its GML Representation
215	AsGeoJSON	KML、GML、GeoJSON、SVG 等格式互操作	语法：AsGeoJSON( geom Geometry , precision Integer \[ , options Integer ] ) : String；官方摘要：base；returns the GeoJSON Geographic JavaScript Object Notation representation； if not explicitly specified precision is 15 decimal digits (default value).；； options can assu...
216	GeomFromGeoJSON	KML、GML、GeoJSON、SVG 等格式互操作	语法：GeomFromGeoJSON( geoJSONGeometry String ) : Geometry；官方摘要：base；construct a geometric object given its GeoJSON Representation
217	AsEWKB	KML、GML、GeoJSON、SVG 等格式互操作	语法：AsEWKB( geom Geometry ) : String；官方摘要：base；returns the EWKB Extended Well Known Binary representation (PostGIS compatibility)
218	GeomFromEWKB	KML、GML、GeoJSON、SVG 等格式互操作	语法：GeomFromEWKB( ewkbGeometry String ) : Geometry；官方摘要：base；construct a geometric object given its EWKB Representation
219	AsEWKT	KML、GML、GeoJSON、SVG 等格式互操作	语法：AsEWKT( geom Geometry ) : String；官方摘要：base；returns the EWKT Extended Well Known Text representation (PostGIS compatibility)
220	GeomFromEWKT	KML、GML、GeoJSON、SVG 等格式互操作	语法：GeomFromEWKT( ewktGeometry String ) : Geometry；官方摘要：base；construct a geometric object given its EWKT Representation
221	AsFGF	KML、GML、GeoJSON、SVG 等格式互操作	语法：AsFGF( geom Geometry , dims Integer ) : Binary；官方摘要：base；returns the FGF FDO Geometry Binary Format representation； dims can assume one of the following values: 0 XY dimension 1 XYZ dimension 2 XYM dimension 3 XYZM dimension
222	GeomFromFGF	KML、GML、GeoJSON、SVG 等格式互操作	语法：GeomFromFGF( fgfGeometry Binary , SRID Integer ) : Geometry；官方摘要：base；construct a geometric object given its FGF binary Representation
223	AsTWKB	KML、GML、GeoJSON、SVG 等格式互操作	语法：AsTWKB( geom Geometry ) : TWKB-blob ； AsTWKB( geom Geometry , precision_xy Integer ) : TWKB-blob ； AsTWKB( geom Geometry , precision_xy Integer , precision_z Integer ) : TWKB-blob ； AsTWKB( geom Geometry , precision_x...；官方摘要：RTTOPO；returns the TWKB Tiny Well Known Binary representation (PostGIS/Mapnik compatibility) the optional arguments precision_xy , precision_z and precision_m are intended t...
224	GeomFromTWKB	KML、GML、GeoJSON、SVG 等格式互操作	语法：GeomFromTWKB( twkbGeometry BLOB , SRID Integer ) : Geometry；官方摘要：RTTOPO；construct a geometric object given its TWKB Representation
225	AsEncodedPolyline	KML、GML、GeoJSON、SVG 等格式互操作	语法：ST_AsEncodedPolyline( geom Geometry ) : TEXT ； ST_AsEncodedPolyline( geom Geometry , precision Integer ) : TEXT；官方摘要：RTTOPO；returns a GoogleMaps encoded Polyline from a Geometry.； The optional arguments precision is intended to specify how many decimal digits should be preserved ( default valu...
226	LineFromEncodedPolyline	KML、GML、GeoJSON、SVG 等格式互操作	语法：ST_LineFromEncodedPolyline( polyline TEXT ) : Geometry ； ST_LineFromEncodedPolyline( polyline TEXT , precision Integer ) : Geometry；官方摘要：RTTOPO；returns a Geometry from a GoogleMaps encoded Polyline .； The optional arguments precision is intended to specify how many decimal digist should be preserved ( default val...

9.15 SQL functions on type Geometry

序号	函数名	函数功能	详细说明
227	Dimension	Geometry 属性、SRID、有效性和结构检查	语法：Dimension( geom Geometry ) : Integer ； ST_Dimension( geom Geometry ) : Integer；官方摘要：X；base；returns the dimension of the geometric object, which is less than or equal to the dimension of the coordinate space
228	CoordDimension	Geometry 属性、SRID、有效性和结构检查	语法：CoordDimension( geom Geometry ) : String；官方摘要：base；returns the dimension model used by the geometric object as:； ' XY ', ' XYZ ', ' XYM ' or ' XYZM '
229	NDims	Geometry 属性、SRID、有效性和结构检查	语法：ST_NDims( geom Geometry ) : Integer；官方摘要：base；returns the dimension number used by the geometric object as:； 2 , 3 or 4 respectively for XY , XYZ and XYZM ( 3 for XYM )
230	Is3D	Geometry 属性、SRID、有效性和结构检查	语法：ST_Is3D( geom Geometry ) : Integer；官方摘要：base；Checks if geom has the Z dimension.； The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and -1 for UNKNOWN when called with invalid arguments.
231	IsMeasured	Geometry 属性、SRID、有效性和结构检查	语法：ST_IsMeasured( geom Geometry ) : Integer；官方摘要：base；Check if geom has the M dimension.； The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and -1 for UNKNOWN when called with invalid arguments.
232	GeometryType	Geometry 属性、SRID、有效性和结构检查	语法：GeometryType( geom Geometry ) : String ； ST_GeometryType( geom Geometry ) : String；官方摘要：X；base；returns the name of the instantiable subtype of Geometry of which this geometric object is a member, as a string. One between: POINT / POINT Z / POINT M / POINT ZM LINEST...
233	SRID	Geometry 属性、SRID、有效性和结构检查	语法：SRID( geom Geometry ) : Integer ； ST_SRID( geom Geometry ) : Integer；官方摘要：X；base；returns the Spatial Reference System ID for this geometric object
234	SetSRID	Geometry 属性、SRID、有效性和结构检查	语法：SetSRID( geom Geometry , SRID Integer ) : Geometry；官方摘要：base；directly sets the Spatial Reference System ID for this geometric object no reprojection is applied； Will return a new Geometry BLOB object, or NULL on invalid arguments o...
235	IsEmpty	Geometry 属性、SRID、有效性和结构检查	语法：IsEmpty( geom Geometry ) : Integer ； ST_IsEmpty( geom Geometry ) : Integer；官方摘要：X；base；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL argument.； TRUE if this geometric object correspond...
236	IsSimple	Geometry 属性、SRID、有效性和结构检查	语法：IsSimple( geom Geometry ) : Integer ； ST_IsSimple( geom Geometry ) : Integer；官方摘要：X；GEOS；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL argument.； TRUE if this geometric object is simple,...
237	IsValid	Geometry 属性、SRID、有效性和结构检查	语法：IsValid( geom Geometry , esri_flag Boolean ) : Integer ； ST_IsValid( geom Geometry , esri_flag Boolean ) : Integer；官方摘要：GEOS；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL argument.； If the ESRI_flag argument is set to 1 (TRU...
238	IsValidReason	Geometry 属性、SRID、有效性和结构检查	语法：IsValidReason( geom Geometry , esri_flag Boolean ) : String ； ST_IsValidReason( geom Geometry , esri_flag Boolean ) : String；官方摘要：GEOS；Will return a TEXT string stating if a Geometry is valid and if not valid, a reason why.； If the ESRI_flag argument is set to 1 (TRUE), then all ESRI-like internal holes (v...
239	IsValidDetail	Geometry 属性、SRID、有效性和结构检查	语法：IsValidDetail( geom Geometry , esri_flag Boolean ) : Geometry ； ST_IsValidDetail( geom Geometry , esri_flag Boolean ) : Geometry；官方摘要：GEOS；Will return a Geometry detail (usually a POINT ) causing invalidity.； If the ESRI_flag argument is set to 1 (TRUE), then all ESRI-like internal holes (violating the standar...
240	Boundary	Geometry 属性、SRID、有效性和结构检查	语法：Boundary( geom Geometry ) : Geometry ； ST_Boundary( geom Geometry ) : Geometry；官方摘要：X；GEOS；returns a geometric object that is the combinatorial boundary of g as defined in the Geometry Model
241	Envelope	Geometry 属性、SRID、有效性和结构检查	语法：Envelope( geom Geometry ) : Geometry ； ST_Envelope( geom Geometry ) : Geometry；官方摘要：X；base；returns the rectangle bounding g as a Polygon. The Polygon is defined by the corner points of the bounding box [(MINX, MINY),(MAXX, MINY), (MAXX, MAXY), (MINX, MAXY), (MI...
242	Expand	Geometry 属性、SRID、有效性和结构检查	语法：ST_Expand( geom Geometry , amount Double precision ) : Geometry；官方摘要：base；returns the rectangle bounding g as a Polygon. The bounding rectangle is expanded in all directions by an amount specified by the second argument.
243	NPoints	Geometry 属性、SRID、有效性和结构检查	语法：ST_NPoints( geom Geometry ) : Integer；官方摘要：base；return the total number of Points (this including any Linestring/Polygon vertex).
244	NRings	Geometry 属性、SRID、有效性和结构检查	语法：ST_NRings( geom Geometry ) : Integer；官方摘要：base；return the total number of Rings (this including both Exterior and Interior Rings).
245	Reverse	Geometry 属性、SRID、有效性和结构检查	语法：ST_Reverse( geom Geometry ) : Geometry；官方摘要：base；returns a new Geometry if a valid Geometry was supplied, or NULL in any other case.； Any Linestring or Ring will be in reverse order (first vertex will be the last one, a...
246	ForceLHR	Geometry 属性、SRID、有效性和结构检查	语法：ST_ForceLHR( geom Geometry ) : Geometry；官方摘要：base；Just an alias-name for ST_ForcePolygonCW() .； Note: this function in Spatialite has a different interpretation then in PostGIS.
247	ForcePolygonCW	Geometry 属性、SRID、有效性和结构检查	语法：ST_ForcePolygonCW( geom Geometry ) : Geometry；官方摘要：base；returns a new Geometry if a valid Geometry was supplied, or NULL in any other case.； All Polygons will be oriented accordingly to Clockwise Rule (all Exterior Ring will b...
248	ForcePolygonCCW	Geometry 属性、SRID、有效性和结构检查	语法：ST_ForcePolygonCCW( geom Geometry ) : Geometry；官方摘要：base；returns a new Geometry if a valid Geometry was supplied, or NULL in any other case.； All Polygons will be oriented accordingly to Counter-Clockwise Rule (all Exterior Rin...
249	IsPolygonCW	Geometry 属性、SRID、有效性和结构检查	语法：ST_IsPolygonCW( geom Geometry ) : Boolean；官方摘要：base；returns TRUE ( 1 ) if all Polygons into the Geometry are oriented accordingly to Clockwise Rule (all Exterior Ring must be clockwise oriented, and all Interior Rings must b...
250	IsPolygonCCW	Geometry 属性、SRID、有效性和结构检查	语法：ST_IsPolygonCCW( geom Geometry ) : Boolean；官方摘要：base；returns TRUE ( 1 ) if all Polygons into the Geometry are oriented accordingly to Counter-Clockwise Rule (all Exterior Ring must be counter-clockwise oriented, and all Inter...

9.16 SQL functions attempting to repair malformed Geometries

序号	函数名	函数功能	详细说明
251	SanitizeGeometry	修复异常或不完整 Geometry	语法：SanitizeGeometry( geom Geometry ) : geom Geometry；官方摘要：base；returns a (possibly) sanitized Geometry if a valid Geometry was supplied , or NULL in any other case； Please note : current implementations only affects: repeated vertic...
252	EnsureClosedRings	修复异常或不完整 Geometry	语法：EnsureClosedRings( geom Geometry ) : geom Geometry；官方摘要：base；returns a new Geometry derived from the input Geometry; all Rings within the output Geometry are ensured to be correctly closed , i.e. will have exactly coincident start an...
253	RemoveRepeatedPoints	修复异常或不完整 Geometry	语法：RemoveRepeatedPoints( geom Geometry ) : geom Geometry ； RemoveRepeatedPoints( geom Geometry , tolerance Double ) : geom Geometry；官方摘要：base；returns a new Geometry derived from the input Geometry; all repeated vertices found in Linestrings or Rings will be removed and the same applies to repeated points found in...

9.17 SQL Geometry-compression functions

序号	函数名	函数功能	详细说明
254	CompressGeometry	Geometry 压缩和解压	语法：CompressGeometry( geom Geometry ) : geom Geometry；官方摘要：base；returns a compressed Geometry if a valid Geometry was supplied , or NULL in any other case； Please note : geometry compression only affects LINESTRINGs and POLYGONs, not...
255	UncompressGeometry	Geometry 压缩和解压	语法：UncompressGeometry( geom Geometry ) : geom Geometry；官方摘要：base；returns an uncompressed Geometry if a valid Geometry was supplied , or NULL in any other case

9.18 SQL Geometry-type casting functions

序号	函数名	函数功能	详细说明
256	CastToPoint	Geometry 类型转换	语法：CastToPoint( geom Geometry ) : geom Geometry；官方摘要：base；returns a POINT -type Geometry if type-conversion is possible , or NULL in any other case； can be applied to any Geometry containing only a single POINT and no other ele...
257	CastToLinestring	Geometry 类型转换	语法：CastToLinestring( geom Geometry ) : geom Geometry；官方摘要：base；returns a LINESTRING -type Geometry if type-conversion is possible , or NULL in any other case； can be applied to any Geometry containing only a single LINESTRING and no...
258	CastToPolygon	Geometry 类型转换	语法：CastToPolygon( geom Geometry ) : geom Geometry；官方摘要：base；returns a POLYGON -type Geometry if type-conversion is possible , or NULL in any other case； can be applied to any Geometry containing only a single POLYGON and no other...
259	CastToMultiPoint	Geometry 类型转换	语法：CastToMultiPoint( geom Geometry ) : geom Geometry；官方摘要：base；returns a MULTIPOINT -type Geometry if type-conversion is possible , or NULL in any other case； can be applied to any Geometry containing one or more POINT(s) and no oth...
260	CastToMultiLinestring	Geometry 类型转换	语法：CastToMultiLinestring( geom Geometry ) : geom Geometry；官方摘要：base；returns a MULTILINESTRING -type Geometry if type-conversion is possible , or NULL in any other case； can be applied to any Geometry containing one or more LINESTRING(s) ...
261	CastToMultiPolygon	Geometry 类型转换	语法：CastToMultiPolygon( geom Geometry ) : geom Geometry；官方摘要：base；returns a MULTIPOLYGON -type Geometry if type-conversion is possible , or NULL in any other case； can be applied to any Geometry containing one or more POLYGON(s) and no...
262	CastToGeometyCollection	Geometry 类型转换	语法：CastToGeometryCollection( geom Geometry ) : geom Geometry；官方摘要：base；returns a GEOMETRYCOLLECTION -type Geometry if type-conversion is possible , or NULL in any other case； can be applied to any valid Geometry
263	CastToMulti	Geometry 类型转换	语法：CastToMulti( geom Geometry ) : geom Geometry ； ST_Multi( geom Geometry ) : geom Geometry；官方摘要：base；returns a MULTIPOINT- , MULTILINESTRING- or MULTIPOLYGON -type Geometry if type-conversion is possible , or NULL in any other case； a MULTIPOINT will be returned for a G...
264	CastToSingle	Geometry 类型转换	语法：CastToSingle( geom Geometry ) : geom Geometry；官方摘要：base；returns a POINT- , LINESTRING- or POLYGON -type Geometry if type-conversion is possible , or NULL in any other case； a POINT will be returned for a Geometry containing o...

9.19 SQL Space-dimensions casting functions

序号	函数名	函数功能	详细说明
265	CastToXY	XY、XYZ、XYM、XYZM 维度转换	语法：CastToXY( geom Geometry ) : geom Geometry；官方摘要：base；returns a Geometry using the XY space dimension
266	CastToXYZ	XY、XYZ、XYM、XYZM 维度转换	语法：CastToXYZ( geom Geometry ) : geom Geometry ； CastToXYZ( geom Geometry , no_data Double ) : geom Geometry；官方摘要：base；returns a Geometry using the XYZ space dimension.； If the input Geometry already supports Z coordinates they'll be preserved as they are.； If the input Geometry does no...
267	CastToXYM	XY、XYZ、XYM、XYZM 维度转换	语法：CastToXYM( geom Geometry ) : geom Geometry ； CastToXYM( geom Geometry , no_data Double ) : geom Geometry；官方摘要：base；returns a Geometry using the XYM space dimension.； If the input Geometry already supports M coordinates they'll be preserved as they are.； If the input Geometry does no...
268	CastToXYZM	XY、XYZ、XYM、XYZM 维度转换	语法：CastToXYZM( geom Geometry ) : geom Geometry ； CastToXYZM( geom Geometry , z_no_data Double , m_no_data Double ) : geom Geometry；官方摘要：base；returns a Geometry using the XYZM space dimension.； If the input Geometry already supports Z coordinates they'll be preserved as they are.； If the input Geometry does n...

9.20 SQL functions on type Point

序号	函数名	函数功能	详细说明
269	X	Point 坐标访问	语法：X( pt Point ) : Double precision ； ST_X( pt Point ) : Double precision；官方摘要：X；base；return the x-coordinate of Point p as a double precision number
270	Y	Point 坐标访问	语法：Y( pt Point ) : Double precision ； ST_Y( pt Point ) : Double precision；官方摘要：X；base；return the y-coordinate of Point p as a double precision number
271	Z	Point 坐标访问	语法：Z( pt Point ) : Double precision ； ST_Z( pt Point ) : Double precision；官方摘要：X；base；return the z-coordinate of Point p as a double precision number； or NULL is no z-coordinate is available
272	M	Point 坐标访问	语法：M( pt Point ) : Double precision ； ST_M( pt Point ) : Double precision；官方摘要：X；base；return the m-coordinate of Point p as a double precision number； or NULL is no m-coordinate is available

9.21 SQL functions on type Curve Linestring or Ring

序号	函数名	函数功能	详细说明
273	StartPoint	曲线属性和简化	语法：StartPoint( c Curve ) : Point ； ST_StartPoint( c Curve ) : Point；官方摘要：X；base；return a Point containing the first Point of c
274	EndPoint	曲线属性和简化	语法：EndPoint( c Curve ) : Point ； ST_EndPoint( c Curve ) : Point；官方摘要：X；base；return a Point containing the last Point of c
275	Length	曲线属性和简化	语法：GLength( c Curve ) : Double precision OpenGis name for this function is Length() , but it conflicts with an SQLite reserved keyword；官方摘要：官方页面未提供摘要，请以 Syntax 和原文说明为准。
276	GLength( c Curve , use_ellipsoid Boolean ) : Double precision ； ST_Length( c Curve , use_ellipsoid Boolean ) : Double precision	曲线属性和简化	语法：X；官方摘要：GEOS；return the length of c (measured in meters).； If the use_ellipsoid argument is set to TRUE the precise (but slower) length will be computed on the Ellipsoid, otherwise will...
277	Perimeter	曲线属性和简化	语法：Perimeter( s Surface ) : Double precision ST_Perimeter( s Surface ) : Double precision；官方摘要：X；GEOS；return the perimeter of s； Starting since v.4.0.0 this function will simply consider Polygons and MultiPolygons, ignoring any Linestring or MultiLinestring
278	Perimeter( s Surface , use_ellipsoid Boolean ) : Double precision ； ST_Perimeter( s Surface , use_ellipsoid Boolean ) : Double precision	曲线属性和简化	语法：X；官方摘要：GEOS；return the perimeter of s (measured in meters).； If the use_ellipsoid argument is set to TRUE the precise (but slower) perimeter will be computed on the Ellipsoid, otherwis...
279	Geodesic Length	曲线属性和简化	语法：GeodesicLength( c Curve ) : Double precision；官方摘要：base；If and only if the SRID associated with c is a geographic one i.e. one using longitude and latitude angles , then returns the length of c measured on the Ellipsoid [...
280	Great Circle Length	曲线属性和简化	语法：GreatCircleLength( c Curve ) : Double precision；官方摘要：base；If and only if the SRID associated with c is a geographic one i.e. one using longitude and latitude angles , then returns the length of c measured on the Great Circl...
281	IsClosed	曲线属性和简化	语法：IsClosed( c Curve ) : Integer ； ST_IsClosed( c Curve ) : Integer；官方摘要：X；GEOS；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL argument;； return TRUE if c is closed, i.e., if Sta...
282	IsRing	曲线属性和简化	语法：IsRing( c Curve ) : Integer ； ST_IsRing( c Curve ) : Integer；官方摘要：X；GEOS；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL argument.； return TRUE if c is a ring, i.e., if c i...
283	PointOnSurface	曲线属性和简化	语法：PointOnSurface( s Surface/Curve ) : Point ； ST_PointOnSurface( s Surface/Curve ) : Point；官方摘要：X；GEOS；return a Point guaranteed to lie on the Surface (or Curve)
284	Simplify	曲线属性和简化	语法：Simplify( c Curve , tolerance Double precision ) : Curve ； ST_Simplify( c Curve , tolerance Double precision ) : Curve ； ST_Generalize( c Curve , tolerance Double precision ) : Curve；官方摘要：GEOS；return a geometric object representing a simplified version of c applying the Douglas-Peuker algorithm with given tolerance
285	SimplifyPreserveTopology	曲线属性和简化	语法：SimplifyPreserveTopology( c Curve , tolerance Double precision ) : Curve ； ST_SimplifyPreserveTopology( c Curve , tolerance Double precision ) : Curve；官方摘要：GEOS；return a geometric object representing a simplified version of c applying the Douglas-Peuker algorithm with given tolerance and respecting topology

9.22 SQL functions on type LineString

序号	函数名	函数功能	详细说明
286	NumPoints	LineString 节点、点编辑和长度统计	语法：NumPoints( line LineString ) : Integer ； ST_NumPoints( line LineString ) : Integer；官方摘要：X；base；return the number of Points in the LineString
287	PointN	LineString 节点、点编辑和长度统计	语法：PointN( line LineString , n Integer ) : Point ； ST_PointN( line LineString , n Integer ) : Point；官方摘要：X；base；return a Point containing Point n of line (first Point corresponds to n=1)
288	AddPoint	LineString 节点、点编辑和长度统计	语法：AddPoint( line LineString , point Point , position Integer ) : Linestring ； ST_AddPoint( line LineString , point Point , position Integer ) : Linestring；官方摘要：base；returns a new Linestring by adding a new Point into the input Linestring immediately before position (zero-based index).； A negative position (default) means appending the ...
289	SetPoint	LineString 节点、点编辑和长度统计	语法：SetPoint( line LineString , position Integer , point Point ) : Linestring ； ST_SetPoint( line LineString , position Integer , point Point ) : Linestring；官方摘要：base；returns a new Linestring by replacing the Point at position (zero-based index).； NULL will be returned if any error is encountered.
290	SetStartPoint	LineString 节点、点编辑和长度统计	语法：SetStartPoint( line LineString , point Point ) : Linestring ； ST_SetStartPoint( line LineString , point Point ) : Linestring；官方摘要：base；returns a new Linestring by replacing its StartPoint.； NULL will be returned if any error is encountered.
291	SetEndPoint	LineString 节点、点编辑和长度统计	语法：SetEndPoint( line LineString , point Point ) : Linestring ； ST_SetEndPoint( line LineString , point Point ) : Linestring；官方摘要：base；returns a new Linestring by replacing its EndPoint.； NULL will be returned if any error is encountered.
292	RemovePoint	LineString 节点、点编辑和长度统计	语法：RemovePoint( line LineString , position Integer ) : Linestring ； ST_RemovePoint( line LineString , position Integer ) : Linestring；官方摘要：base；returns a new Linestring by removing the Point at position (zero-based index).； NULL will be returned if any error is encountered.
293	GetPointIndex	LineString 节点、点编辑和长度统计	语法：GetPointIndex( line LineString , point Point ) : Integer ； GetPointIndex( line LineString , point Point , check_multiple Boolean ) : Integer ； ST_GetPointIndex line LineString , point Point ) : Integer ； ST_GetPointIn...；官方摘要：base；returns the position (zero-based index) of the Linestring's vertex nearest to the given Point.； NULL will be returned if any error is encountered. if the optional argument ...
294	SetMultiplePoints	LineString 节点、点编辑和长度统计	语法：SetMultiplePoints( line LineString , pk_value Integer , table_name Text , point_name Text , pk_name Text , position_name Text ) : Linestring ； ST_SetMultiplePoints( line LineString , pk_value Integer , table_name Text...；官方摘要：base；returns a new Linestring by replacing one or more Vertices accordingly to the content of an auxiliary helper table .；； Note : this one is a very special SQL Function not in...
295	INTEGER NOT NULL	LineString 节点、点编辑和长度统计	语法：-- column containing Feature IDs；官方摘要：官方页面未提供摘要，请以 Syntax 和原文说明为准。
296	INTEGER NOT NULL	LineString 节点、点编辑和长度统计	语法：-- column containing vertex positions (zero-based index)；官方摘要：官方页面未提供摘要，请以 Syntax 和原文说明为准。
297	SELECT AddGeometryColumn( / POINT / );	LineString 节点、点编辑和长度统计	语法：-- Geometry column of the POINT type containing the new vertices to be replaced；官方摘要：官方页面未提供摘要，请以 Syntax 和原文说明为准。
298	LinestringMinSegmentLength	LineString 节点、点编辑和长度统计	语法：LinestringMinSegmentLength( line LineString ) : Double precision ； LinestringMinSegmentLength( line LineString , boolean ignore_repeated_vertices ) : Double precision ； ST_LinestringMinSegmentLength( line LineString )...；官方摘要：base；any eventual repeated vertex will be ignored or considered accordingly to the seeting of the optional argument ignore_repeated_vertices ； The default setting is TRUE (that ...
299	LinestringMaxSegmentLength	LineString 节点、点编辑和长度统计	语法：LinestringMaxSegmentLength( line LineString ) : Double precision ； ST_LinestringMaxSegmentLength( line LineString ) : Double precision；官方摘要：base；returns the length of the longest segment in the Linestring.； NULL will be returned if any error is encountered.； Note : this function only accepts simple Linestrings; Geom...
300	LinestringAvgSegmentLength	LineString 节点、点编辑和长度统计	语法：LinestringAvgSegmentLength( line LineString ) : Double precision ； ST_LinestringAvgSegmentLength( line LineString ) : Double precision；官方摘要：base；returns the average length of segments in the Linestring.； NULL will be returned if any error is encountered.； Note : this function only accepts simple Linestrings; Geometr...
301	CurvosityIndex	LineString 节点、点编辑和长度统计	语法：CurvosityIndex( line LineString ) : Double precision ； CurvosityIndex( line LineString , extra-points Integer ) : Double precision ； ST_CurvosityIndex( line LineString ) : Double precision ； ST_CurvosityIndex( line Li...；官方摘要：base；returns the Curvosity Index of a generic simple Linestring: the Index will range between 1.0 ( in the case of a perfectly straight line ) and 0.0 ( in the case of a closed ...
302	UphillHeight	LineString 节点、点编辑和长度统计	语法：UphillHeight( line LineString ) : Double precision ； ST_UphillHeight( line LineString ) : Double precision；官方摘要：base；returns the total Uphill Height of a generic simple Linestring: 0.0 will be always returned for any 2D Linestring not containing Z coordinates. NULL will be returned if any...
303	DownhillHeight	LineString 节点、点编辑和长度统计	语法：DownhillHeight( line LineString ) : Double precision ； ST_DownhillHeight( line LineString ) : Double precision；官方摘要：base；returns the total Downhill Height of a generic simple Linestring: 0.0 will be always returned for any 2D Linestring not containing Z coordinates. NULL will be returned if a...
304	UpDownHeight	LineString 节点、点编辑和长度统计	语法：UpDownHeight( line LineString ) : Double precision ； ST_UpDownHeight( line LineString ) : Double precision；官方摘要：base；returns the sum of total UpHill and DownHill Heights of a generic simple Linestring: this is just a convenience method ; calling ST_UpDownHeight(line) is exactly the same t...

9.23 SQL functions on type Surface Polygon or Ring

序号	函数名	函数功能	详细说明
305	Centroid	Surface 质心和面积	语法：Centroid( s Surface ) : Point ； ST_Centroid( s Surface ) : Point；官方摘要：X；GEOS；return the centroid of s, which may lie outside s
306	Area	Surface 质心和面积	语法：Area( s Surface ) : Double precision ； ST_Area( s Surface ) : Double precision；官方摘要：X；GEOS；return the area of s
307	Area( s Surface , use_ellipsoid Boolean ) : Double precision ； ST_Area( s Surface , use_ellipsoid Boolean ) : Double precision	Surface 质心和面积	语法：X；官方摘要：RTTOPO；return the area of s (measured in meters).； If the use_ellipsoid argument is set to TRUE the precise (but slower) area will be computed on the Ellipsoid, otherwise will b...
308	Circularity	Surface 质心和面积	语法：Circularity( s Surface ) : Double precision；官方摘要：X；GEOS；computes the Circularity Index from the given Geometry by applying the following formula: index = ( 4 PI Sum(area) ) / ( Sum(perimeter) * Sum(perimeter) ) it only app...
309	Circularity( s Surface , use_ellipsoid Boolean ) : Double precision	Surface 质心和面积	语法：X；官方摘要：RTTOPO；same as the above Function, but in this case areas and perimeters will be measured in meters.； If the use_ellipsoid argument is set to TRUE the precise (but slower) value...

9.24 SQL functions on type Polygon

序号	函数名	函数功能	详细说明
310	ExteriorRing	Polygon 外环和内环访问	语法：ExteriorRing( polyg Polygon ) : LineString ； ST_ExteriorRing( polyg Polygon ) : LineString；官方摘要：X；base；return the exteriorRing of p
311	NumInteriorRing / NumInteriorRings	Polygon 外环和内环访问	语法：NumInteriorRing( polyg Polygon ) : Integer ； NumInteriorRings( polyg Polygon ) : Integer ； ST_NumInteriorRing( polyg Polygon ) : Integer；官方摘要：X；base；return the number of interiorRings
312	InteriorRingN	Polygon 外环和内环访问	语法：InteriorRingN( polyg Polygon , n Integer ) : LineString ； ST_InteriorRingN( polyg Polygon , n Integer ) : LineString；官方摘要：X；base；return the nth (1-based) interiorRing. The order of Rings is not geometrically significant.

9.25 SQL functions on type GeomCollection

序号	函数名	函数功能	详细说明
313	NumGeometries	GeometryCollection 成员访问	语法：NumGeometries( geom GeomCollection ) : Integer ； ST_NumGeometries( geom GeomCollection ) : Integer；官方摘要：X；base；return the number of individual Geometries
314	GeometryN	GeometryCollection 成员访问	语法：GeometryN( geom GeomCollection , n Integer ) : Geometry ； ST_GeometryN( geom GeomCollection , n Integer ) : Geometry；官方摘要：X；base；return the nth (1-based) geometric object in the collection. The order of the elements in the collection is not geometrically significant.

9.26 SQL functions that test approximate spatial relationships via MBRs

序号	函数名	函数功能	详细说明
315	MbrEqual	基于真实 Geometry 的精确空间关系	语法：MbrEqual( geom1 Geometry , geom2 Geometry ) : Integer；官方摘要：base；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with NULL or invalid arguments.； TRUE if g1 and g2 have equal MBRs
316	MbrDisjoint	基于真实 Geometry 的精确空间关系	语法：MbrDisjoint( geom1 Geometry , geom2 Geometry ) : Integer；官方摘要：base；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with NULL or invalid arguments.； TRUE if the intersection of g1 a...
317	MbrTouches	基于真实 Geometry 的精确空间关系	语法：MbrTouches( geom1 Geometry , geom2 Geometry ) : Integer；官方摘要：base；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with NULL or invalid arguments.； TRUE if the only Points in commo...
318	MbrWithin	基于真实 Geometry 的精确空间关系	语法：MbrWithin( geom1 Geometry , geom2 Geometry ) : Integer；官方摘要：base；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with NULL or invalid arguments.； TRUE if g1 MBR is completely con...
319	MbrOverlaps	基于真实 Geometry 的精确空间关系	语法：MbrOverlaps( geom1 Geometry , geom2 Geometry ) : Integer；官方摘要：base；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with NULL or invalid arguments.； TRUE if the intersection of g1 a...
320	MbrIntersects	基于真实 Geometry 的精确空间关系	语法：MbrIntersects( geom1 Geometry , geom2 Geometry ) : Integer；官方摘要：base；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with NULL or invalid arguments;； convenience predicate: TRUE if t...
321	EnvelopesIntersects	基于真实 Geometry 的精确空间关系	语法：ST_EnvIntersects( geom1 Geometry , geom2 Geometry ) : Integer ； ST_EnvelopesIntersects( geom1 Geometry , geom2 Geometry ) : Integer ； ST_EnvIntersects( geom1 Geometry , x1 Double precision , y1 Double precision , x2 D...；官方摘要：base；The first form simply is an alias name for MbrIntersects ; the other form allows to define the second MBR by two extreme points x1, y1 and x2, y2 .； The return type ...
322	MbrContains	基于真实 Geometry 的精确空间关系	语法：MbrContains( geom1 Geometry , geom2 Geometry ) : Integer；官方摘要：base；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with NULL arguments;； convenience predicate: TRUE if g2 MBR is co...

9.27 SQL functions that test spatial relationships

序号	函数名	函数功能	详细说明
323	Equals	基于真实 Geometry 的精确空间关系	语法：Equals( geom1 Geometry , geom2 Geometry ) : Integer ； ST_Equals( geom1 Geometry , geom2 Geometry ) : Integer；官方摘要：X；GEOS；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with NULL arguments.； TRUE if g1 and g2 are equal
324	Disjoint	基于真实 Geometry 的精确空间关系	语法：Disjoint( geom1 Geometry , geom2 Geometry ) : Integer ； ST_Disjoint( geom1 Geometry , geom2 Geometry ) : Integer；官方摘要：X；GEOS；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with NULL arguments.； TRUE if the intersection of g1 and g2 is ...
325	Touches	基于真实 Geometry 的精确空间关系	语法：Touches( geom1 Geometry , geom2 Geometry ) : Integer ； ST_Touches( geom1 Geometry , geom2 Geometry ) : Integer；官方摘要：X；GEOS；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with NULL arguments.； TRUE if the only Points in common between...
326	Within	基于真实 Geometry 的精确空间关系	语法：Within( geom1 Geometry , geom2 Geometry ) : Integer ； ST_Within( geom1 Geometry , geom2 Geometry ) : Integer；官方摘要：X；GEOS；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with NULL arguments.； TRUE if g1 is completely contained in g2
327	Overlaps	基于真实 Geometry 的精确空间关系	语法：Overlaps( geom1 Geometry , geom2 Geometry ) : Integer ； ST_Overlaps( geom1 Geometry , geom2 Geometry ) : Integer；官方摘要：X；GEOS；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with NULL arguments.； TRUE if the intersection of g1 and g2 res...
328	Crosses	基于真实 Geometry 的精确空间关系	语法：Crosses( geom1 Geometry , geom2 Geometry ) : Integer ； ST_Crosses( geom1 Geometry , geom2 Geometry ) : Integer；官方摘要：X；GEOS；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with NULL arguments.； TRUE if the intersection of g1 and g2 res...
329	Intersects	基于真实 Geometry 的精确空间关系	语法：Intersects( geom1 Geometry , geom2 Geometry ) : Integer ； ST_Intersects( geom1 Geometry , geom2 Geometry ) : Integer；官方摘要：X；GEOS；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with NULL arguments;； convenience predicate: TRUE if the inters...
330	Contains	基于真实 Geometry 的精确空间关系	语法：Contains( geom1 Geometry , geom2 Geometry ) : Integer ； ST_Contains( geom1 Geometry , geom2 Geometry ) : Integer；官方摘要：X；GEOS；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with NULL arguments;； convenience predicate: TRUE if g2 is comp...
331	Covers	基于真实 Geometry 的精确空间关系	语法：Covers( geom1 Geometry , geom2 Geometry ) : Integer ； ST_Covers( geom1 Geometry , geom2 Geometry ) : Integer；官方摘要：GEOS；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with NULL arguments;； convenience predicate: TRUE if g1 completel...
332	CoveredBy	基于真实 Geometry 的精确空间关系	语法：CoveredBy( geom1 Geometry , geom2 Geometry ) : Integer ； ST_CoveredBy( geom1 Geometry , geom2 Geometry ) : Integer；官方摘要：GEOS；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with NULL arguments;； convenience predicate: TRUE if g1 is comple...

9.28 non-canonical signature (PostGIS-like)

序号	函数名	函数功能	详细说明
333	RelateMatch	空间 SQL 支撑函数	语法：ST_RelatedMatch( matrix Text , pattern Text ) : Integer；官方摘要：GEOS；Evaluates if an intersection matrix DE-9IM satisfies an intersection pattern.； The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKN...

9.29 SQL functions for distance relationships

序号	函数名	函数功能	详细说明
334	Distance	距离和距离阈值关系	语法：Distance( geom1 Geometry , geom2 Geometry ) : Double precision ； ST_Distance( geom1 Geometry , geom2 Geometry ) : Double precision；官方摘要：X；GEOS；return the distance between geom1 and geom2 (always measured in CRS units).
335	Distance( geom1 Geometry , geom2 Geometry , use_ellipsoid Boolean ) : Double precision ； ST_Distance( geom1 Geometry , geom2 Geometry , use_ellipsoid Boolean ) : Double precision	距离和距离阈值关系	语法：X；官方摘要：GEOS；return the distance between geom1 and geom2 (measured in meters).； If the use_ellipsoid argument is set to TRUE the precise (but slower) distance will be computed on the El...
336	DistanceWithin	距离和距离阈值关系	语法：DistanceWithin( geom1 Geometry , geom2 Geometry , range Double precision ] ) : Integer ； ST_DistanceWithin( geom1 Geometry , geom2 Geometry , range Double precision ) : Integer；官方摘要：GEOS；return TRUE (1) if the distance between geom1 and geom2 is within the given range.； Distances are always expressed in the length unit corresponding to the geoms own SRID； N...
337	PtDistWithin	距离和距离阈值关系	语法：PtDistWithin( geom1 Geometry , geom2 Geometry , range Double precision , use_spheroid Integer ) : Integer；官方摘要：PROJ；return TRUE (1) if the distance between geom1 and geom2 is within the given range.； Usually distances are expressed in the length unit corresponding to the geoms own SRID: ...

9.30 SQL functions supporting Linear Referencing

序号	函数名	函数功能	详细说明
338	AddMeasure	线性参考和 M 值定位	语法：ST_AddMeasure( geom Geometry , m_start Double precision , m_end Double precision ) : Geometry；官方摘要：base；Return a derived Geometry with M-values linearly interpolated between the start and end points.； NULL will be returned if any error is encountered.； Please note : NULL will...
339	InterpolatePoint	线性参考和 M 值定位	语法：ST_InterpolatePoint( line Geometry , point Geometry ) : Double precision；官方摘要：GEOS；Interpolates the M-value of a linear Geometry at the point closest to the given point.； NULL will be returned if any error is encountered.； Please note : NULL will be retur...
340	LocateAlongMeasure	线性参考和 M 值定位	语法：ST_Locate_Along_Measure( geom Geometry , m_value Double precision ) : Geometry ； ST_LocateAlong( geom Geometry , m_value Double precision ) : Geometry；官方摘要：base；Return a derived geometry collection value with elements that match the specified measure.； NULL will be returned if any error is encountered (or when no element correspond...
341	LocateBetweenMeasures	线性参考和 M 值定位	语法：ST_Locate_Between_Measures( geom Geometry , m_start Double precision , m_end Double precision ) : Geometry ； ST_LocateBetween( geom Geometry , m_start Double precision , m_end Double precision ) : Geometry；官方摘要：base；Return a derived geometry collection value with elements that match the specified range of measures.； NULL will be returned if any error is encountered (or when no element ...
342	IsValidTrajectory	线性参考和 M 值定位	语法：ST_IsValidTrajectory( geom Geometry ) : Integer；官方摘要：base；Checks if a Geometry corresponds to a valid Trajectory.； a Trajectory is assumed to be a LINESTRING supporting M-values growing from each vertex to the next.； Will return 1...
343	TrajectoryInterpolatePoint	线性参考和 M 值定位	语法：ST_TrajectoryInterpolatePoint( geom Geometry , m_value Double ) : Geometry；官方摘要：base；Return a POINT Geometry being interpolated along the Geometry (that is expected to be a valid Trajectory) accordingly to the given M-value.； The interpolated Point will hav...

9.31 SQL functions that implement spatial operators

序号	函数名	函数功能	详细说明
344	Intersection	几何集合运算和派生 Geometry	语法：Intersection( geom1 Geometry , geom2 Geometry ) : Geometry ； ST_Intersection( geom1 Geometry , geom2 Geometry ) : Geometry；官方摘要：X；GEOS；return a geometric object that is the intersection of geometric objects geom1 and geom2
345	Difference	几何集合运算和派生 Geometry	语法：Difference( geom1 Geometry , geom2 Geometry ) : Geometry ； ST_Difference( geom1 Geometry , geom2 Geometry ) : Geometry；官方摘要：X；GEOS；return a geometric object that is the closure of the set difference of geom1 and geom2
346	GUnion	几何集合运算和派生 Geometry	语法：GUnion( geom1 Geometry , geom2 Geometry ) : Geometry OpenGis name for this function is Union() , but it conflicts with an SQLite reserved keyword；官方摘要：官方页面未提供摘要，请以 Syntax 和原文说明为准。
347	GUnion	几何集合运算和派生 Geometry	语法：GUnion( geom Geometry ) : Geometry ； ST_Union( geom Geometry ) : Geometry；官方摘要：X；GEOS；return a geometric object that is the set union of input values aggregate function
348	SymDifference	几何集合运算和派生 Geometry	语法：SymDifference( geom1 Geometry , geom2 Geometry ) : Geometry ； ST_SymDifference( geom1 Geometry , geom2 Geometry ) : Geometry；官方摘要：X；GEOS；return a geometric object that is the closure of the set symmetric difference of geom1 and geom2 (logical XOR of space)
349	Buffer	几何集合运算和派生 Geometry	语法：Buffer( geom Geometry , dist Double precision , quadrantsegments Integer ) : Geometry ； ST_Buffer( geom Geometry , dist Double precision , quadrantsegments Integer ) : Geometry；官方摘要：X；GEOS；return a geometric object defined by buffering a distance around the geom, where dist is in the distance units for the Spatial Reference of geom.； the optional quadrantse...
350	ConvexHull	几何集合运算和派生 Geometry	语法：ConvexHull( geom Geometry ) : Geometry ； ST_ConvexHull( geom Geometry ) : Geometry；官方摘要：X；GEOS；return a geometric object that is the convex hull of geom

9.32 SQL functions that implement spatial operators；GEOS specific features

序号	函数名	函数功能	详细说明
351	OffestCurve	几何集合运算和派生 Geometry	语法：OffsetCurve( geom Curve , radius Double precision ) : Curve ； ST_OffsetCurve( geom Curve , radius Double precision ) : Curve；官方摘要：GEOS；return a geometric object representing the corresponding left-sided ( positive radius ) or right-sided ( negative radius ) offset curve； NULL is returned whenever is not po...
352	SingleSidedBuffer	几何集合运算和派生 Geometry	语法：SingleSidedBuffer( geom Curve , radius Double precision , left_or_right Integer ) : Geometry ； ST_SingleSidedBuffer( geom Curve , radius Double precision , left_or_right Integer ) : GeometryCurve；官方摘要：GEOS；return a geometric object representing the corresponding left- (or right-sided ) single-sided buffer； NULL is returned whenever is not possible deriving a single-sided buff...
353	SharedPaths	几何集合运算和派生 Geometry	语法：SharedPaths( geom1 Geometry , geom2 Geomety ) : Geometry ； ST_SharedPaths( geom1 Geometry , geom2 Geomety ) : Geometry；官方摘要：GEOS；return a geometric object (of the MULTILINESTRING type) representing any common lines shared by both geometries； NULL is returned is no common line exists
354	Line_Interpolate_Point	几何集合运算和派生 Geometry	语法：Line_Interpolate_Point( line Curve , fraction Double precision ) : Point ； ST_Line_Interpolate_Point( line Curve , fraction Double precision ) : Point；官方摘要：GEOS；return a point interpolated along a line.； Second argument (between 0.0 and 1.0 ) representing fraction of total length of linestring the point has to be located.； NULL is ...
355	Line_Interpolate_Equidistant_Points	几何集合运算和派生 Geometry	语法：Line_Interpolate_Equidistant_Points( line Curve , distance Double precision ) : MultiPoint ； ST_Line_Interpolate_Equidistant_Points( line Curve , distance Double precision ) : MultiPoint；官方摘要：GEOS；return a set of equidistant points interpolated along a line; the returned geometry always corresponds to a MULTIPOINT supporting the M coordinate (representing the progres...
356	Line_Locate_Point	几何集合运算和派生 Geometry	语法：Line_Locate_Point( line Curve , point Point ) : Double precision ； ST_Line_Locate_Point( line Curve , point Point ) : Double precision；官方摘要：GEOS；return a number (between 0.0 and 1.0 ) representing the location of the closest point on LineString to the given Point, as a fraction of total 2d line length.； NULL is retu...
357	Line_Substring	几何集合运算和派生 Geometry	语法：Line_Substring( line Curve , start_fraction Double precision , end_fraction Double precision ) : Curve ； ST_Line_Substring( line Curve , start_fraction Double precision , end_fraction Double precision ) : Curve；官方摘要：GEOS；Return a Linestring being a substring of the input one starting and ending at the given fractions of total 2d length.； Second and third arguments are expected to be in the ...
358	ClosestPoint	几何集合运算和派生 Geometry	语法：ClosestPoint( geom1 Geometry , geom2 Geometry ) : Point ； ST_ClosestPoint( geom1 Geometry , geom2 Geometry ) : Point；官方摘要：GEOS；Returns the Point on geom1 that is closest to geom2.； NULL is returned for invalid arguments (or if distance is ZERO)
359	ShortestLine	几何集合运算和派生 Geometry	语法：ShortestLine( geom1 Geometry , geom2 Geometry ) : Curve ； ST_ShortestLine( geom1 Geometry , geom2 Geometry ) : Curve；官方摘要：GEOS；Returns the shortest line between two geometries.； NULL is returned for invalid arguments (or if distance is ZERO)
360	Snap	几何集合运算和派生 Geometry	语法：Snap( geom1 Geometry , geom2 Geometry , tolerance Double precision ) : Geometry ； ST_Snap( geom1 Geometry , geom2 Geometry , tolerance Double precision ) : Geometry；官方摘要：GEOS；Returns a new Geometry representing a modified geom1 , so to "snap" vertices and segments to geom2 vertices; a snap distance tolerance is used to control where snapping is ...
361	Collect	几何集合运算和派生 Geometry	语法：Collect( geom1 Geometry , geom2 Geometry ) : Geometry ； ST_Collect( geom1 Geometry , geom2 Geometry ) : Geometry；官方摘要：GEOS；a generic Geometry (possibly a GEOMETRYCOLLECTION) will be returned merging geom1 and geom2 ； NULL will be returned if any error is encountered
362	Collect	几何集合运算和派生 Geometry	语法：Collect( geom Geometry ) : Geometry ； ST_Collect( geom Geometry ) : Geometry；官方摘要：GEOS；a generic Geometry (possibly a GEOMETRYCOLLECTION) will be returned merging input Geometries all together； aggregate function ； NULL will be returned if any error is encoun...
363	LineMerge	几何集合运算和派生 Geometry	语法：LineMerge( geom Geometry ) : Geometry ； ST_LineMerge( geom Geometry ) : Geometry；官方摘要：GEOS；a Geometry (actually corresponding to a LINESTRING or MULTILINESTRING ) will be returned.； The input Geometry is expected to represent a LINESTRING or a MULTILINESTRING .； ...
364	BuildArea	几何集合运算和派生 Geometry	语法：BuildArea( geom Geometry ) : Geometry ； ST_BuildArea( geom Geometry ) : Geometry；官方摘要：GEOS；a Geometry (actually corresponding to a POLYGON or MULTIPOLYGON ) will be returned.； The input Geometry is expected to represent a LINESTRING or a MULTILINESTRING .； The in...
365	Polygonize	几何集合运算和派生 Geometry	语法：Polygonize( geom Geometry ) : Geometry ； ST_Polygonize( geom Geometry ) : Geometry；官方摘要：GEOS；Exactly the same as ST_BuildArea , but implemented as an aggregate function .； NULL will be returned if any error is encountered
366	MakePolygon	几何集合运算和派生 Geometry	语法：MakePolygon( geom1 Geometry , geom2 Geometry ) : Geometry ； ST_MakePolygon( geom1 Geometry , geom2 Geometry ) : Geometry；官方摘要：base；Kind of lightweight/simplified ST_BuildArea : the first input Geometry is always expected to represent a closed LINESTRING assumed to identify the output polygon's Exterior...
367	UnaryUnion	几何集合运算和派生 Geometry	语法：UnaryUnion( geom Geometry ) : Geometry ； ST_UnaryUnion( geom Geometry ) : Geometry；官方摘要：GEOS；Exactely the same as ST_Union , but applied to a single Geometry.； ( set union of elementary Geometries within a MULTI- or GEOMETRYCOLLECTION complex Geometry )； NULL will ...
368	DrapeLine	几何集合运算和派生 Geometry	语法：ST_DrapeLine( geom1 Geometry , geom2 Geometry ) : Geometry ； ST_DrapeLine( geom1 Geometry , geom2 Geometry , tolerance Double ) : Geometry；官方摘要：GEOS；Will return a 3D Linestring by draping geom1 over geom2 : geom1 is expected to be a 2D Linestring ( XY or XYM dimensions). geom2 is expected to be a 3D Linestring ( XYZ or ...
369	DrapeLineExceptions	几何集合运算和派生 Geometry	语法：ST_DrapeLineExceptions( geom1 Geometry , geom2 Geometry ) : Geometry ； ST_DrapeLineExceptions( geom1 Geometry , geom2 Geometry , tolerance Double ) : Geometry ； ST_DrapeLineExceptions( geom1 Geometry , geom2 Geometry ...；官方摘要：GEOS；Will return a 3D MultiPoint containing all undraped Vertices encountered when draping geom1 over geom2 : geom1 , geom2 and tolerance exactly have the same interpretation as...
370	DissolveSegments	几何集合运算和派生 Geometry	语法：DissolveSegments( geom Geometry ) : Geometry ； ST_DissolveSegments( geom Geometry ) : Geometry；官方摘要：base；a Geometry (actually corresponding to a LINESTRING , MULTILINESTRING or GEOMETRYCOLLECTION ) will be returned.； The input Geometry is arbitrary: any POINT will remain unaff...
371	DissolvePoints	几何集合运算和派生 Geometry	语法：DissolvePoints( geom Geometry ) : Geometry ； ST_DissolvePoints( geom Geometry ) : Geometry；官方摘要：base；a Geometry (actually corresponding to a POINT or MULTIPOINT ) will be returned.； The input Geometry is arbitrary: any POINT will remain unaffected, but any LINESTRING or RI...
372	LinesFromRings	几何集合运算和派生 Geometry	语法：LinesFromRings( geom Geometry ) : Geometry ； ST_LinesFromRings( geom Geometry ) : Geometry；官方摘要：base；a Geometry (actually corresponding to a LINESTRING or MULTILINESTRING ) will be returned.； The input Geometry is expected to be a POLYGON or MULTIPOLYGON ; any RING will th...
373	LinesCutAtNodes	几何集合运算和派生 Geometry	语法：LinesCutAtNodes( geom1 Geometry , geom2 Geometry ) : Geometry ； ST_LinesCutAtNodes( geom1 Geometry , geom2 Geometry ) : Geometry；官方摘要：base；a Geometry (actually corresponding to a LINESTRING or MULTILINESTRING ) will be returned.； The first input Geometry is expected to be a LINESTRING or MULTILINESTRING ( Line...
374	RingsCutAtNodes	几何集合运算和派生 Geometry	语法：RingsCutAtNodes( geom Geometry ) : Geometry ； ST_RingsCutAtNodes( geom Geometry ) : Geometry；官方摘要：base；a Geometry (actually corresponding to a LINESTRING or MULTILINESTRING ) will be returned.； The input Geometry is expected to be a POLYGON or MULTIPOLYGON ( Rings ); any sel...
375	CollectionExtract	几何集合运算和派生 Geometry	语法：CollectionExtract( geom Geometry , type Integer ) : Geometry ； ST_CollectionExtract( geom Geometry , type Integer ) : Geometry；官方摘要：base；Given any arbitrary GEOMETRY will return a derived geometry consisting only of the specified type. Sub-geometries that are not the specified type are ignored.； 1 = POINT-ty...
376	ExtractMultiPoint	几何集合运算和派生 Geometry	语法：ExtractMultiPoint( geom Geometry ) : Geometry；官方摘要：base；Given any arbitrary GEOMETRY will return a derived MULTIPOINT geometry. Sub-geometries not being of the POINT type will be ignored.； NULL will be returned if any error is e...
377	ExtractMultiLinestring	几何集合运算和派生 Geometry	语法：ExtractMultiLinestring( geom Geometry ) : Geometry；官方摘要：base；Given any arbitrary GEOMETRY will return a derived MULTILINESTRING geometry. Sub-geometries not being of the LINESTRING type will be ignored.； NULL will be returned if any ...
378	ExtractMultiPolygon	几何集合运算和派生 Geometry	语法：ExtractMultiPolygon( geom Geometry ) : Geometry；官方摘要：base；Given any arbitrary GEOMETRY will return a derived MULTIPOLYGON geometry. Sub-geometries not being of the POLYGON type will be ignored.； NULL will be returned if any error ...

9.33 SQL functions that implement spatial operators；GEOS advanced features

序号	函数名	函数功能	详细说明
379	DelaunayTriangulation	几何集合运算和派生 Geometry	语法：DelaunayTriangulation( geom Geometry , edges_only Boolean \[ , tolerance Double precision ] ) : Geometry ； ST_DelaunayTriangulation( geom Geometry , edges_only Boolean \[ , tolerance Double precision ] ) : Geometry；官方摘要：GEOS-advanced；return a geometric object representing the Delaunay Triangulation corresponding to the input Geometry； The input Geometry could have any arbitrary type; eventually...
380	ConstrainedDelaunayTriangulation	几何集合运算和派生 Geometry	语法：ConstrainedDelaunayTriangulation( geom Geometry ) : Geometry ； ST_ConstrainedDelaunayTriangulation( geom Geometry ) : Geometry；官方摘要：GEOS-3100；return a constrained Delaunay triangulation of the vertices of the given polygon(s).； NULL is returned on failure.
381	VoronojDiagram	几何集合运算和派生 Geometry	语法：VoronojDiagram( geom Geometry , edges_only Boolean \[ , frame_extra_size Double precision \[ , tolerance Double precision ] ] ) : Geometry ； ST_VoronojDiagram( geom Geometry [ , edges_only Boolean [ , frame_extra_si...；官方摘要：GEOS-advanced；return a geometric object representing the Voronoj Diagram corresponding to the input Geometry； The input Geometry could have any arbitrary type; eventually all Li...
382	ConcaveHull	几何集合运算和派生 Geometry	语法：ConcaveHull( geom Geometry , factor Double precision \[ , allow_holes Boolean \[ , tolerance Double precision ] ] ) : Geometry ； ST_ConcaveHull( geom Geometry [ , factor Double precision [ , allow_holes Boolean [ , ...；官方摘要：GEOS-advanced；return a geometric object representing the ConcaveHull corresponding to the input Geometry； The input Geometry could have any arbitrary type; eventually all Linest...
383	HausdorffDistance	几何集合运算和派生 Geometry	语法：HausdorffDistance( geom1 Geometry , geom2 Geometry ) : Double precision ； HausdorffDistance( geom1 Geometry , geom2 Geometry , densify_fract Double precision ) : Double precision ； ST_HausdorffDistance( geom1 Geometry...；官方摘要：GEOS-advanced；return the Hausdorff distance between geom1 and geom2； learn more ； the optional argument densify_fract is the fraction (in the range 0.0 / 1.0 ) by which to densi...
384	FrechetDistance	几何集合运算和派生 Geometry	语法：FrechetDistance( geom1 Geometry , geom2 Geometry ) : Double precision ； FrechetDistance( geom1 Geometry , geom2 Geometry , densify_fract Double precision ) : Double precision ； ST_FrechetDistance( geom1 Geometry , geo...；官方摘要：GEOS-advanced；return the Fréchet distance between geom1 and geom2； learn more ； the optional argument densify_fract is the fraction (in the range 0.0 / 1.0 ) by which to densify...
385	GEOSMinimumRotatedRectangle	几何集合运算和派生 Geometry	语法：GEOSMinimumRotatedRectangle( geom Geometry ) : Geometry；官方摘要：GEOS-advanced；Returns the minimum rotated rectangular POLYGON which encloses the input geometry.； The rectangle has width equal to the minimum diameter, and a longer length.； If...
386	OrientedEnvelope	几何集合运算和派生 Geometry	语法：OrientedEnvelope( geom Geometry ) : Geometry ； ST_OrientedEnvelope( geom Geometry ) : Geometry；官方摘要：GEOS-advanced；Just an alias-name for GEOSMinimumRotatedRectangle() .
387	GEOSMaximumInscribedCircle	几何集合运算和派生 Geometry	语法：GEOSMaximumInscribedCircle( geom Geometry , tolerance Double precision ) : Geometry；官方摘要：GEOS-advanced；Constructs the Maximum Inscribed Circle for a polygonal geometry, up to a specified tolerance.； The Maximum Inscribed Circle is determined by a point in the interi...
388	GEOSMinimumBoundingCircle	几何集合运算和派生 Geometry	语法：GEOSMinimumBoundingCircle( geom Geometry ) : Geometry；官方摘要：GEOS-advanced；Constructs the Minimum Bounding Circle for a generic geometry.； The Minimum Bounding Circle is the smallest circle that contains the input.； Returns a two-point li...
389	GEOSMinimumBoundingRadius	几何集合运算和派生 Geometry	语法：GEOSMinimumBoundingRadius( geom Geometry ) : Double precision；官方摘要：GEOS-advanced；Returns the Radius of the Minimum Bounding Circle for a generic geometry.； NULL is returned on failure.； This SQL function is only available when using GEOS 3.7.0 ...
390	GEOSMinimumBoundingCenter	几何集合运算和派生 Geometry	语法：GEOSMinimumBoundingCenter( geom Geometry ) : Geometry；官方摘要：GEOS-advanced；Returns a POINT Geometry corresponding to the Center of the Minimum Bounding Circle for a generic geometry.； NULL is returned on failure.； This SQL function is onl...
391	GEOSLargestEmptyCircle	几何集合运算和派生 Geometry	语法：GEOSLargestEmptyCircle( geom Geometry , tolerance Double precision ) : Geometry；官方摘要：GEOS-advanced；Constructs the Largest Empty Circle for a set of obstacle geometries, up to a specified tolerance. The obstacles are point and line geometries.； The Largest Empty ...
392	GEOSMinimumWidth	几何集合运算和派生 Geometry	语法：GEOSMinimumWidth( geom Geometry ) : Geometry；官方摘要：GEOS-advanced；Returns a LINESTRING geometry which represents the minimum diameter of the geometry.； The minimum diameter is defined to be the width of the smallest band that con...
393	GEOSMinimumClearance	几何集合运算和派生 Geometry	语法：GEOSMinimumClearance( geom Geometry ) : Double precision；官方摘要：GEOS-advanced；Computes the minimum clearance of a geometry.； The minimum clearance is the smallest amount by which a vertex could be move to produce an invalid polygon, a non-si...
394	GEOSMinimumClearanceLine	几何集合运算和派生 Geometry	语法：GEOSMinimumClearanceLine( geom Geometry ) : Geometry；官方摘要：GEOS-advanced；Returns a LineString whose endpoints define the minimum clearance of a geometry.； NULL is returned on failure, or if the geometry has no minimum clearance (as e.g...
395	GeosDensify	几何集合运算和派生 Geometry	语法：GeosDensify( geom Geometry , tolerance Double precision ) : Geometry；官方摘要：GEOS-3100；return a densified geometry using a given distance tolerance； Additional vertices will be added to every line segment that is greater this tolerance ; these vertices w...
396	GeosMakeValid	几何集合运算和派生 Geometry	语法：GeosMakeValid( geom Geometry , keep_collapsed boolean ) : Geometry；官方摘要：GEOS-3100；Attempts to make an invalid geometry valid (the GEOS way).； If the optional argument keep_collapsed is TRUE all collapsed items ( i.e. linestrings reduced to points or...
397	ReducePrecision	几何集合运算和派生 Geometry	语法：ReducePrecision( geom Geometry , grid_size Double precision ) : Geometry ； ST_ReducePrecision( geom Geometry , grid_size Double precision ) : Geometry；官方摘要：GEOS-3100；Change the coordinate precision of a geometry.； The output will be a valid Geometry.； NULL is returned on failure.
398	HilbertCode	几何集合运算和派生 Geometry	语法：HilbertCode( geom Geometry , extent Geometry , level integer ] ) : Integer；官方摘要：GEOS-3110；Calculate the Hilbert Code of the centroid of a Geometry relative to an Extent.； This allows sorting geometries in a deterministic way, such that similar Hilbert Codes...
399	GeosConcaveHull	几何集合运算和派生 Geometry	语法：GeosConcaveHull( geom Geometry , ratio Double precision , allow_holes Boolean ) : Geometry；官方摘要：GEOS-3110；return a geometric object representing the ConcaveHull corresponding to the input Geometry； The input Geometry could have any arbitrary type; eventually all Linestring...

9.34 SQL functions that implement spatial operators；RTTOPO features

序号	函数名	函数功能	详细说明
400	MakeValid	几何集合运算和派生 Geometry	语法：MakeValid( geom Geometry ) : Geometry ； ST_MakeValid( geom Geometry ) : Geometry；官方摘要：RTTOPO；return a geometric object representing the repaired version of the input Geometry.； If the input Geometry was already valid, then it will be returned exactly as it was.； ...
401	MakeValidDiscarded	几何集合运算和派生 Geometry	语法：MakeValidDiscarded( geom Geometry ) : Geometry ； ST_MakeValidDiscarded( geom Geometry ) : Geometry；官方摘要：RTTOPO；return a geometric object containing all elements that would be eventually discarded by ST_MakeValid() while validating the same input Geometry.； NULL is returned on fail...
402	Segmentize	几何集合运算和派生 Geometry	语法：Segmentize( geom Geometry , dist Double precision ) : Geometry ； ST_Segmentize( geom Geometry , dist Double precision ) : Geometry；官方摘要：RTTOPO；return a new Geometry corresponding to the input Geometry; as much Linestring / Ring vertices as required will be eventually interpolated so to ensure that no segment wil...
403	Split	几何集合运算和派生 Geometry	语法：Split( geom Geometry , blade Geometry ) : Geometry ； ST_Split( geom Geometry , blade Geometry ) : Geometry；官方摘要：RTTOPO；return a new Geometry collecting all items resulting by splitting the input Geometry by the blade .； NULL is returned on failure.
404	SplitLeft	几何集合运算和派生 Geometry	语法：SplitLeft( geom Geometry , blade Geometry ) : Geometry ； ST_SplitLeft( geom Geometry , blade Geometry ) : Geometry；官方摘要：RTTOPO；return a new Geometry collecting all items resulting by splitting the input Geometry by the blade and falling on the left side .； All items not affected by the split oper...
405	SplitRight	几何集合运算和派生 Geometry	语法：SplitRight( geom Geometry , blade Geometry ) : Geometry ； ST_SplitRight( geom Geometry , blade Geometry ) : Geometry；官方摘要：RTTOPO；return a new Geometry collecting all items resulting by splitting the input Geometry by the blade and falling on the right side .； NULL is returned on failure (or if the ...
406	SnapAndSplit	几何集合运算和派生 Geometry	语法：SnapAndSplit( geom1 Geometry , geom2 Geometry , tolerance Double precision ) : Geometry ； ST_SnapAndSplit( geom1 Geometry , geom2 Geometry , tolerance Double precision ) : Geometry；官方摘要：RTTOPO；This one simply is a convenience function accepting the same arguments of ST_Snap() (with identical meaning). geom1 is expected to be a LINESTRING or a MULTILINESTRING ge...
407	Azimuth	几何集合运算和派生 Geometry	语法：Azimuth( pt1 Geometry , pt2 Geometry ) : Double precision ； ST_Azimuth( pt1 Geometry , pt2 Geometry ) : Double precision；官方摘要：RTTOPO；return the angle (in radians) from the horizontal of the vector defined by pt1 and pt2 .； Both pt1 and pt2 are expected to be simple Points.； Starting since 4.1.0 if both...
408	Project	几何集合运算和派生 Geometry	语法：Project( start_point Geometry , distance Double precision , azimuth Double precision ) : Geometry ； ST_Project( start_point Geometry , distance Double precision , azimuth Double precision ) : Geometry；官方摘要：RTTOPO；return a new Point projected from a start point using a bearing and distance.； start_point is expected to be simple long/lat Point.； distance is expected to be measured i...
409	SnapToGrid	几何集合运算和派生 Geometry	语法：SnapToGrid( geom Geometry , size Double precision ) : Geometry ； SnapToGrid( geom Geometry , size_x Double precision , size_y Double precision ) : Geometry ； SnapToGrid( geom Geometry , origin_x Double precision , ori...；官方摘要：base；return a new Geometry corresponding to the input Geometry; all points and vertices will be snapped to the grid defined by its origin and size(s).； Removes all consecutive p...
410	GeoHash	几何集合运算和派生 Geometry	语法：GeoHash( geom Geometry , precision Integer ) : String ； ST_GeoHash( geom Geometry , precision Integer ) : String；官方摘要：RTTOPO；Return a GeoHash representation (geohash.org) of the geometry.； A GeoHash encodes a point into a text form that is sortable and searchable based on prefixing.； If no prec...
411	AsX3D	几何集合运算和派生 Geometry	语法：AsX3D( geom Geometry ) : String ； AsX3D( geom Geometry , precision Integer ) : String ； AsX3D( geom Geometry , precision Integer , options Integer ) : String ； AsX3D( geom Geometry , precision Integer , options Intege...；官方摘要：RTTOPO；Returns a geometry as an X3D XML formatted node element.
412	MaxDistance	几何集合运算和派生 Geometry	语法：MaxDistance( geom1 Geometry , geom2 Geometry ) : Double precision ； ST_MaxDistance( geom1 Geometry , geom2 Geometry ) : Double precision；官方摘要：RTTOPO；return the max distance between geom1 and geom2
413	3DDistance	几何集合运算和派生 Geometry	语法：ST_3DDistance( geom1 Geometry , geom2 Geometry ) : Double precision；官方摘要：RTTOPO；return the 3D-distance between geom1 and geom2 (Z coordinates will be considered)
414	3DMaxDistance	几何集合运算和派生 Geometry	语法：ST_3DMaxDistance( geom1 Geometry , geom2 Geometry ) : Double precision；官方摘要：RTTOPO；return the max 3D-distance between geom1 and geom2 (Z coordinates will be considered)
415	3dLength	几何集合运算和派生 Geometry	语法：ST_3dLength( geom Geometry ) : Double precision；官方摘要：RTTOPO；return the total 2D or 3D-length of Linestring or MultiLinestring geometry.； Z coordinates if eventually present will be considered leading to a 3D measured length; other...
416	ST_Node	几何集合运算和派生 Geometry	语法：ST_Node( geom Geometry ) : Geometry；官方摘要：RTTOPO；Fully nodes a set of linestrings using the least possible number of nodes while preserving all of the input ones.； NULL will be returned if the input Geometry isn't a set...
417	SelfIntersections	几何集合运算和派生 Geometry	语法：SelfIntersections( geom Geometry ) : Geometry ； ST_SelfIntersections( geom Geometry ) : Geometry；官方摘要：RTTOPO；Returns a MultiPoint Geometry representing any self-intersection found within the input geometry expected to be of the Linestring or MultiLinestring type.； NULL will be...
418	ST_Subdivide	几何集合运算和派生 Geometry	语法：ST_Subdivide( geom Geometry ) : Geometry ； ST_Subdivide( geom Geometry , max_vertices Integer ) : Geometry；官方摘要：RTTOPO；Divides geom into many parts until each part can be represented using no more than max_vertices .； If the optional argument max_vertices is not explicitly specified a lim...

9.35 SQL functions for coordinate transformations

序号	函数名	函数功能	详细说明
419	Transform	坐标平移、缩放、旋转和 CRS 变换	语法：Transform( geom Geometry , newSRID Integer ) : Geometry ； ST_Transform( geom Geometry , newSRID Integer ) : Geometry ； Transform( geom Geometry , newSRID Integer , area_of_use Geometry ) : Geometry ； ST_Transform( geo...；官方摘要：PROJ；return a geometric object obtained by reprojecting coordinates into the Reference System identified by newSRID； All the following optional arguments are available only when...
420	TransformXY	坐标平移、缩放、旋转和 CRS 变换	语法：TransformXY( geom Geometry , newSRID Integer ) : Geometry ； ST_TransformXY( geom Geometry , newSRID Integer ) : Geometry；官方摘要：PROJ；this is a special flavor of ST_Transform() ; just X and Y coordinates will be transformed, Z and M values (if eventually present) will be left untouched.； Mainly intended a...
421	TransformXYZ	坐标平移、缩放、旋转和 CRS 变换	语法：TransformXYZ( geom Geometry , newSRID Integer ) : Geometry ； ST_TransformXYZ( geom Geometry , newSRID Integer ) : Geometry；官方摘要：PROJ；this is a special flavor of ST_Transform() ; just X , Y and Z coordinates will be transformed, M values (if eventually present) will be left untouched.； Mainly intended as ...
422	SridFromAuthCRS	坐标平移、缩放、旋转和 CRS 变换	语法：SridFromAuthCRS( auth_name String , auth_SRID Integer ) : Integer；官方摘要：base；return the internal SRID corresponding to auth_name and auth_SRID ； -1 will be returned if no such CRS is defined
423	ShiftCoords / ShiftCoordinates	坐标平移、缩放、旋转和 CRS 变换	语法：ShiftCoords( geom Geometry , shiftX Double precision , shiftY Double precision ) : Geometry ； ShiftCoordinates( geom Geometry , shiftX Double precision , shiftY Double precision ) : Geometry；官方摘要：base；return a geometric object obtained by translating coordinates according to shiftX and shiftY values
424	ST_Translate	坐标平移、缩放、旋转和 CRS 变换	语法：ST_Translate( geom Geometry , shiftX Double precision , shiftY Double precision , shiftZ Double precision ) : Geometry；官方摘要：base；return a geometric object obtained by translating coordinates according to shiftX, shiftY and shiftZ values
425	ST_Shift_Longitude	坐标平移、缩放、旋转和 CRS 变换	语法：ST_Shift_Longitude( geom Geometry ) : Geometry；官方摘要：base；return a geometric object obtained by translating any negative longitude by 360.； Only meaningful for geographic (longitude/latitude) coordinates.； Negative longitudes (-18...
426	NormalizeLonLat	坐标平移、缩放、旋转和 CRS 变换	语法：NormalizeLonLat( geom Geometry ) : Geometry；官方摘要：base；return a geometric object obtained by normalizing any longitude in the range -180 / +180 and any latitude in the range -90 / + 90.； Only meaningful for geographic (long...
427	ScaleCoords / ScaleCoordinates	坐标平移、缩放、旋转和 CRS 变换	语法：ScaleCoords( geom Geometry , scaleX Double precision , scaleY Double precision ) : Geometry ； ScaleCoordinates( geom Geometry , scaleX Double precision , scaleY Double precision ) : Geometry；官方摘要：base；return a geometric object obtained by scaling coordinates according to scaleX and scaleY values； if only one scale factor is specified, then an isotropic scaling occurs [i...
428	RotateCoords / RotateCoordinates	坐标平移、缩放、旋转和 CRS 变换	语法：RotateCoords( geom Geometry , angleInDegrees Double precision ) : Geometry ； RotateCoordinates( geom Geometry , angleInDegrees Double precision ) : Geometry；官方摘要：base；return a geometric object obtained by rotating coordinates according to angleInDegrees value.； Positive angle = clockwise rotation.； Negative angle = counterclockwise rotat...
429	ReflectCoords / ReflectCoordinates	坐标平移、缩放、旋转和 CRS 变换	语法：ReflectCoords( geom Geometry , xAxis Integer , yAxis Integer ) : Geometry ； ReflectCoordinates( geom Geometry , xAxis Integer , yAxis Integer ) : Geometry；官方摘要：base；return a geometric object obtained by reflecting coordinates according to xAxis and yAxis switches； i.e. if xAxis is 0 (FALSE), then x-coordinates remains untouched; otherw...
430	SwapCoords / SwapCoordinates	坐标平移、缩放、旋转和 CRS 变换	语法：SwapCoords( geom Geometry ) : Geometry ； SwapCoordinates( geom Geometry ) : Geometry；官方摘要：base；return a geometric object obtained by swapping x- and y-coordinates

9.36 SQL functions supporting Geodesic Arcs

序号	函数名	函数功能	详细说明
431	GeodesicArcLength	地理坐标上的测量计算	语法：GeodesicArcLength( geom1 Geometry , geom2 Geometry ) : Double precision ； GeodesicArcLength( geom1 Geometry , geom2 Geometry , meters Boolean ) : Double precision；官方摘要：PROJ GEODESIC；returns the Arc length (distance) between geom1 and geom2 as the surface measurement of the outer circle arc / earth surface.； if meters = 0 the result will be in ...
432	GeodesicChordLength	地理坐标上的测量计算	语法：GeodesicChordLength( geom1 Geometry , geom2 Geometry ) : Double precision ； GeodesicChordLength( geom1 Geometry , geom2 Geometry , meters Boolean ) : Double precision；官方摘要：PROJ GEODESIC；returns the length of the shortest line (distance) between geom1 and geom2 through the outer circle / earth surface.； if meters = 0 the result will be in degrees, ...
433	GeodesicCentralAngle	地理坐标上的测量计算	语法：GeodesicCentralAngle( geom1 Geometry , geom2 Geometry ) : Double precision ； GeodesicCentralAngle( geom1 Geometry , geom2 Geometry , radians Boolean ) : Double precision；官方摘要：PROJ GEODESIC；returns the angle from the circle center to the geom1 and geom2 on the outer circle / earth surface.； if radians = 0 the result will be in degrees, otherwise radia...
434	GeodesicArcArea	地理坐标上的测量计算	语法：GeodesicArcArea( geom1 Geometry , geom2 Geometry ) : Double precision；官方摘要：PROJ GEODESIC；returns the area of the segment/arc between the Chord and Arc , created by geom1 and geom2 , inside the outer circle / earth surface.； Since the Radius is in meter...
435	GeodesicArcHeight	地理坐标上的测量计算	语法：GeodesicArcHeight( geom1 Geometry , geom2 Geometry ) : Double precision；官方摘要：PROJ GEODESIC；returns the height of the segment/arc (short-Sagitta) between the Chord and Arc , created by geom1 and geom2 , inside the outer circle / earth surface.； Since the ...

9.37 SQL functions supporting Affine Transformations and Ground Control Points

序号	函数名	函数功能	详细说明
436	ATM_Create	空间 SQL 支撑函数	语法：ATM_Create( void ) : AffineMatrix ； ATM_Create( a Double , b Double , d Double , e Double , xoff Double , yoff Double ) : AffineMatrix ； ATM_Create( a Double , b Double , c Double , d Double , e Double , f Double , g ...；官方摘要：base；return a BLOB-encoded Affine Transformation matrix. the first form (no arguments) will return an Identity matrix. the second and third forms will respectively return a full...
437	ATM_CreateTranslate	空间 SQL 支撑函数	语法：ATM_CreateTranslate( tx Double precision , ty Double precision ) : AffineMatrix ； ATM_CreateTranslate( tx Double precision , ty Double precision , tz Double precision ) : AffineMatrix；官方摘要：base；return a BLOB-encoded Affine Transformation matrix representing a 2D or 3D Translate transformation.； will return NULL on invalid arguments.
438	ATM_CreateScale	空间 SQL 支撑函数	语法：ATM_CreateScale( sx Double precision , sy Double precision ) : AffineMatrix ； ATM_CreateScale( sx Double precision , sy Double precision , sz Double precision ) : AffineMatrix；官方摘要：base；return a BLOB-encoded Affine Transformation matrix representing a 2D or 3D Scale transformation.； will return NULL on invalid arguments.
439	ATM_CreateRotate	空间 SQL 支撑函数	语法：ATM_CreateRotate( angleInDegrees Double precision ) : AffineMatrix ； ATM_CreateZRoll( angleInDegrees Double precision ) : AffineMatrix；官方摘要：base；return a BLOB-encoded Affine Transformation matrix representing a Rotate transformation (along the Z axis ).； will return NULL on invalid argument.
440	ATM_CreateXRoll	空间 SQL 支撑函数	语法：ATM_CreateXRoll( angleInDegrees Double precision ) : AffineMatrix；官方摘要：base；return a BLOB-encoded Affine Transformation matrix representing a Rotate transformation (along the X axis ).； will return NULL on invalid argument.
441	ATM_CreateYRoll	空间 SQL 支撑函数	语法：ATM_CreateYRoll( angleInDegrees Double precision ) : AffineMatrix；官方摘要：base；return a BLOB-encoded Affine Transformation matrix representing a Rotate transformation (along the Y axis ).； will return NULL on invalid argument.
442	ATM_Multiply	空间 SQL 支撑函数	语法：ATM_Multiply( matrixA AffineMatrix , matrixB AffineMatrix ) : AffineMatrix；官方摘要：base；return a BLOB-encoded Affine Transformation matrix representing the result of multiplying matrixA by matrixB .； will return NULL on invalid arguments.
443	ATM_Translate	空间 SQL 支撑函数	语法：ATM_Translate( matrix AffineMatrix , tx Double precision , ty Double precision ) : AffineMatrix ； ATM_Translate( matrix AffineMatrix , tx Double precision , ty Double precision , tz Double precision ) : AffineMatrix；官方摘要：base；return a BLOB-encoded Affine Transformation matrix by chaining a further 2D or 3D Translate to a previous transformation matrix.； will return NULL on invalid arguments.
444	ATM_Scale	空间 SQL 支撑函数	语法：ATM_Scale( matrix AffineMatrix , sx Double precision , sy Double precision ) : AffineMatrix ； ATM_Scale( matrix AffineMatrix , sx Double precision , sy Double precision , sz Double precision ) : AffineMatrix；官方摘要：base；return a BLOB-encoded Affine Transformation matrix by chaining a further 2D or 3D Scale to a previous transformation matrix.； will return NULL on invalid arguments.
445	ATM_Rotate	空间 SQL 支撑函数	语法：ATM_Rotate( matrix AffineMatrix , angleInDegrees Double precision ) : AffineMatrix ； ATM_ZRoll( matrix AffineMatrix , angleInDegrees Double precision ) : AffineMatrix；官方摘要：base；return a BLOB-encoded Affine Transformation matrix by chaining a further Rotate (along the Z axis ) to a previous transformation matrix.； will return NULL on invalid argument.
446	ATM_XRoll	空间 SQL 支撑函数	语法：ATM_XRoll( matrix AffineMatrix , angleInDegrees Double precision ) : AffineMatrix；官方摘要：base；return a BLOB-encoded Affine Transformation matrix by chaining a further Rotate (along the X axis ) to a previous transformation matrix.； will return NULL on invalid argument.
447	ATM_YRoll	空间 SQL 支撑函数	语法：ATM_YRoll( matrix AffineMatrix , angleInDegrees Double precision ) : AffineMatrix；官方摘要：base；return a BLOB-encoded Affine Transformation matrix by chaining a further Rotate (along the Y axis ) to a previous transformation matrix.； will return NULL on invalid argument.
448	ATM_Determinant	空间 SQL 支撑函数	语法：ATM_Determinant( matrix AffineMatrix ) : Double precision；官方摘要：base；return the Determinant from an Affine Transformation matrix.； will return 0.0 on invalid argument.
449	ATM_IsInvertible	空间 SQL 支撑函数	语法：ATM_IsInvertible( matrix AffineMatrix ) : Integer；官方摘要：base；return 1 if the Affine Transformation matrix can be inverted, 0 if not.； will return -1 on invalid argument.
450	ATM_Invert	空间 SQL 支撑函数	语法：ATM_Invert( matrix AffineMatrix ) : AffineMatrix；官方摘要：base；return an inverted Affine Transformation matrix.； will return NULL on invalid argument.
451	ATM_IsValid	空间 SQL 支撑函数	语法：ATM_IsValid( matrix AffineMatrix ) : Integer；官方摘要：base；return 1 if the BLOB argument really contains a valid Affine Transformation matrix, 0 if not.； will return -1 on invalid argument.
452	ATM_AsText	空间 SQL 支撑函数	语法：ATM_AsText( matrix AffineMatrix ) : Text；官方摘要：base；return a serialized text string corresponding to an Affine Transformation matrix.； will return NULL on invalid argument.
453	ATM_Transform	空间 SQL 支撑函数	语法：ATM_Transform( geom Geometry , matrix AffineMatrix , newSRID Integer ) : Geometry；官方摘要：base；return a geometric object obtained by applying an Affine Transformation; if the optional arg newSRID is defined then the returned Geometry will assume the corresponding Ref...
454	GCP_Compute	空间 SQL 支撑函数	语法：GCP_Compute( pointA Geometry , pointB Geometry , order Integer ) : PolynomialCoeffs；官方摘要：GrassGis code；GPLv2+；return BLOB-encoded objects containing Polynomial coefficients computed from a set of matching Ground Control Points pairs. pointA corresponds to the origin...
455	GCP_IsValid	空间 SQL 支撑函数	语法：GCP_IsValid( matrix PolynomialCoeffs ) : Integer；官方摘要：GrassGis code；GPLv2+；return 1 if the BLOB argument really contains valid Polynomial coeffs, 0 if not.； will return -1 on invalid argument.
456	GCP_AsText	空间 SQL 支撑函数	语法：GCP_AsText( matrix PolynomialCoeffs ) : Text；官方摘要：GrassGis code；GPLv2+；return a serialized text string corresponding to the Polynomial coeffs.； will return NULL on invalid argument.
457	GCP2ATM	空间 SQL 支撑函数	语法：GCP2ATM( matrix PolynomialCoeffs ) : AffineMatrix；官方摘要：GrassGis code；GPLv2+；return an Affine Transformation matrix corresponding to the Polynomial coeffs.； Only a set of Polynomial coeffs of the 1st order can be converted to an Affi...
458	GCP_Transform	空间 SQL 支撑函数	语法：GCP_Transform( geom Geometry , coeffs PolynomialCoeffs , newSRID Integer ) : Geometry；官方摘要：GrassGis code；GPLv2+；return a geometric object obtained by applying a Transformation based on Polynomial coefficients of the 1st , 2nd or 3rd order ; if the optional arg newSRID...

9.38 SQL functions for Spatial-MetaData and Spatial-Index handling

序号	函数名	函数功能	详细说明
459	InitSpatialMetaData	空间元数据、GeoTable 和空间索引	语法：InitSpatialMetaData( void ) : Integer ； InitSpatialMetaData( transaction Integer ) : Integer ； InitSpatialMetaData( mode String ) : Integer ； InitSpatialMetaData( transaction Integer , mode String ) : Integer；官方摘要：base；Creates the geometry_columns and spatial_ref_sys metadata tables； the return type is Integer, with a return value of 1 for TRUE or 0 for FALSE if the optional argument tran...
460	InitAdvancedMetaData	空间元数据、GeoTable 和空间索引	语法：InitAdvancedMetaData( void ) : Integer ； InitAdvancedMetaData( transaction Integer ) : Integer；官方摘要：base；This one simply is an utility function intended to create several ancillary metadata tables required by libspatialite v.5 and subsequent versions.； the return type is Integ...
461	InitSpatialMetaDataFull	空间元数据、GeoTable 和空间索引	语法：InitSpatialMetaDataFull( void ) : Integer ； InitSpatialMetaDataFull( transaction Integer ) : Integer ； InitSpatialMetaDataFull( mode String ) : Integer ； InitSpatialMetaDataFull( transaction Integer , mode String ) : ...；官方摘要：base；This one simply is a convenience function accepting the same arguments of InitSpatialMetaData() (with identical meaning).； The intended scope is to fully initialize all met...
462	CreateMissingSystemTables	空间元数据、GeoTable 和空间索引	语法：CreateMissingSystemTables( void ) : Integer ； CreateMissingSystemTables( relaxed Integer ) : Integer ； CreateMissingSystemTables( relaxed Integer , transaction Integer ) : Integer；官方摘要：base；This function will create any missing ancillary metadata table required by libspatialite v.5 and subsequent versions.； the optional argument relaxed has the same interpreta...
463	CreateMissingRasterlite2Columns	空间元数据、GeoTable 和空间索引	语法：CreateMissingRasterlite2Columns( void ) : Integer；官方摘要：base；This function will create any missing column on metadata tables required by librasterlite2 v.2 and subsequent versions.；； The return type is Integer, with a return value of...
464	InsertEpsgSrid	空间元数据、GeoTable 和空间索引	语法：InsertEpsgSrid( srid Integer ) : Integer；官方摘要：base；Attempts to insert into spatial_ref_sys the EPSG definition uniquely identified by srid ； [the corresponding EPSG SRID definition will be copied from the inlined dataset de...
465	AddGeometryColumn	空间元数据、GeoTable 和空间索引	语法：AddGeometryColumn( table String , column String , srid Integer , geom_type String , dimension String \[ , not_null Integer ] ) : Integer；官方摘要：X；base；Creates a new geometry column updating the Spatial Metadata tables and creating any required trigger in order to enforce constraints； geom_type has to be one of the follo...
466	AddTemporaryGeometryColumn	空间元数据、GeoTable 和空间索引	语法：AddTemporaryGeometryColumn( db-prefix String , table String , column String , srid Integer , geom_type String , dimension String \[ , not_null Integer ] ) : Integer；官方摘要：base；Almost the same as AddGeometryColumn() , with a critical difference: db-prefix is the schema-name of some attached database Such an Attached Database must necessarily be of...
467	RecoverGeometryColumn	空间元数据、GeoTable 和空间索引	语法：RecoverGeometryColumn( table String , column String , srid Integer , geom_type String , dimension Integer ) : Integer；官方摘要：base；Validates an existing ordinary column in order to possibly transform it in a real geometry column , thus updating the Spatial Metadata tables and creating any required trig...
468	DiscardGeometryColumn	空间元数据、GeoTable 和空间索引	语法：DiscardGeometryColumn( table String , column String ) : Integer；官方摘要：base；Removes a geometry column from Spatial MetaData tables and drops any related trigger ； the column itself still continues to exist untouched as an ordinary, unconstrained co...
469	RegisterVirtualGeometry	空间元数据、GeoTable 和空间索引	语法：RegisterVirtualGeometry( table String ) : Integer；官方摘要：base；Registers a VirtualShape or VirtualGeoJSON table into the Spatial MetaData tables; the VirtualShape table should be previously created by invoking CREATE VIRTUAL TABLE ... ...
470	DropVirtualGeometry	空间元数据、GeoTable 和空间索引	语法：DropVirtualGeometry( table String ) : Integer；官方摘要：base；Removes a VirtualShape or VirtualGeoJSON table from the Spatial MetaData tables, dropping the VirtualTable table as well. ； the return type is Integer, with a return value ...
471	CreateSpatialIndex	空间元数据、GeoTable 和空间索引	语法：CreateSpatialIndex( table String , column String ) : Integer；官方摘要：base；Builds an RTree Spatial Index on a geometry column , creating any required trigger required in order to enforce full data coherency between the main table and Spatial Index...
472	CreateTemporarySpatialIndex	空间元数据、GeoTable 和空间索引	语法：CreateTemporarySpatialIndex( db-prefix String , table String , column String ) : Integer；官方摘要：base；Almost the same as CreateSpatialIndex() , but specifically intended to support Geometry columns created by AddTemporaryGeometryColumn() db-prefix is the schema-name of some...
473	CreateMbrCache	空间元数据、GeoTable 和空间索引	语法：CreateMbrCache( table String , column String ) : Integer；官方摘要：base；Builds an MbrCache on a geometry column , creating any required trigger required in order to enforce full data coherency between the main table and the MbrCache； the return...
474	DisableSpatialIndex	空间元数据、GeoTable 和空间索引	语法：DisableSpatialIndex( table String , column String ) : Integer；官方摘要：base；Disables an RTree Spatial Index or MbrCache , removing any related trigger ； the return type is Integer, with a return value of 1 for TRUE or 0 for FALSE
475	CheckShadowedRowid	空间元数据、GeoTable 和空间索引	语法：CheckShadowedRowid( table String ) : Integer；官方摘要：base；Checks if some table has a physical column named "rowid" (caseless) shadowing the real ROWID.； the return type is Integer, with a return value of 1 for TRUE or 0 for FALSE；...
476	CheckWithoutRowid	空间元数据、GeoTable 和空间索引	语法：CheckWithoutRowid( table String ) : Integer；官方摘要：base；Checks if some table was created by specifying a WITHOUT ROWID clause.； the return type is Integer, with a return value of 1 for TRUE or 0 for FALSE； NULL will be returned ...
477	CheckSpatialIndex	空间元数据、GeoTable 和空间索引	语法：CheckSpatialIndex( void ) : Integer ； CheckSpatialIndex( table String , column String ) : Integer；官方摘要：base；Checks an RTree Spatial Index for validity and consistency if no arguments are passed, then any RTree defined into geometry_columns will be checked otherwise only the RTree...
478	RecoverSpatialIndex	空间元数据、GeoTable 和空间索引	语法：RecoverSpatialIndex( no_check : Integer ) : Integer ； RecoverSpatialIndex( table String , column String , no_check : Integer ) : Integer；官方摘要：base；Recovers a ( possibly broken ) RTree Spatial Index if no arguments are passed, then any RTree defined into geometry_columns will be recovered otherwise only the RTree corre...
479	InvalidateLayerStatistics	空间元数据、GeoTable 和空间索引	语法：InvalidateLayerStatistics( void ) : Integer ； InvalidateLayerStatistics( table String \[ , column String ) : Integer；官方摘要：base；Immediately and unconditionally invalidates the internal Layer Statistics if no arguments are passed, then internal statistics will be invalidated for any possible Geometry...
480	UpdateLayerStatistics	空间元数据、GeoTable 和空间索引	语法：UpdateLayerStatistics( void ) : Integer ； UpdateLayerStatistics( table String , column String ) : Integer；官方摘要：base；Updates the internal Layer Statistics Feature Count and Total Extent if no arguments are passed, then internal statistics will be updated for any possible Geometry Column...
481	GetLayerExtent	空间元数据、GeoTable 和空间索引	语法：GetLayerExtent( table String , column String \[ , mode Boolean ] ) : Geometry；官方摘要：base；Return the Envelope corresponding to the Total Extent ( bounding box ] of some Layer; if the Table/Layer only contains a single Geometry column passing the column name isn'...
482	CreateRasterCoveragesTable	空间元数据、GeoTable 和空间索引	语法：CreateRasterCoveragesTable( void ) : Integer；官方摘要：base；Creates the raster_coverages table required by RasterLite-2 ； the return type is Integer, with a return value of 1 for TRUE (success) or 0 for FALSE (failure)
483	ReCreateRasterCoveragesTriggers	空间元数据、GeoTable 和空间索引	语法：ReCreateRasterCoveragesTriggers( void ) : Integer；官方摘要：base；(Re)Creates all Triggers supporting the raster_coverages table required by RasterLite-2 ； the return type is Integer, with a return value of 1 for TRUE (success) or 0 for F...
484	CreateVectorCoveragesTables	空间元数据、GeoTable 和空间索引	语法：CreateVectorCoveragesTables( void ) : Integer；官方摘要：base；Creates the vector_coverages and vector_coverages_srid tables required by RasterLite-2 ； the return type is Integer, with a return value of 1 for TRUE (success) or 0 for FA...
485	ReCreateVectorCoveragesTriggers	空间元数据、GeoTable 和空间索引	语法：ReCreateVectorCoveragesTriggers( void ) : Integer；官方摘要：base；(Re)Creates all Triggers supporting the vector_coverages table required by RasterLite-2 ； the return type is Integer, with a return value of 1 for TRUE (success) or 0 for F...
486	RebuildGeometryTriggers	空间元数据、GeoTable 和空间索引	语法：RebuildGeometryTriggers( table_name String , geometry_column_name String ) : integer；官方摘要：base；This function will reinstall all geometry-related Triggers for the named table.； the return type is Integer, with a return value of 1 for TRUE (success) or 0 for FALSE (fai...
487	UpgradeGeometryTriggers	空间元数据、GeoTable 和空间索引	语法：UpgradeGeometryTriggers( transaction Integer ) : integer；官方摘要：base；This function will upgrade all geometry-related Triggers to the latest version (all DB tables declaring at least one Geometry will be affected by the upgrade).； If the tran...

9.39 SQL functions supporting the MetaCatalog and related Statistics

序号	函数名	函数功能	详细说明
488	CreateMetaCatalogTables	空间对象目录和统计	语法：CreateMetaCatalogTables( transaction Integer ) : Integer；官方摘要：base；Creates both splite_metacatalog and splite_metacatalog_statistics tables; splite_metacatalog will be populated so to describe every table/column currently defined within th...
489	UpdateMetaCatalogStatistics	空间对象目录和统计	语法：UpdateMetaCatalogStatistics( transaction Integer , table_name String , column_name String ) : Integer ； UpdateMetaCatalogStatistics( transaction Integer , master_table String , table_name String , column_name String )...；官方摘要：base；Updates the splite_metacatalog_statistics table by computing the statistic summary for the required table/column.； if the first argument transaction is set to TRUE the whol...

9.40 SQL functions supporting SLD/SE Styled Layers

序号	函数名	函数功能	详细说明
490	CreateStylingTables	样式和图层注册	语法：CreateStylingTables() : Integer ； CreateStylingTables( relaxed Integer ) : Integer ； CreateStylingTables( relaxed Integer , transaction Integer ) : Integer；官方摘要：libxml2；Creates a set of tables supporting SLD/SE Styled Layers . if the optional argument relaxed is explicitly set as TRUE then a relaxed version of the validating Triggers wi...
491	ReCreateStylingTriggers	样式和图层注册	语法：ReCreateStylingTriggers() : Integer ； ReCreateStylingTriggers( relaxed Integer ) : Integer ； ReCreateStylingTriggers( relaxed Integer , transaction Integer ) : Integer；官方摘要：libxml2；(Re)Creates once again all Triggers supporting SLD/SE Styled Layers tables. if the optional argument relaxed is explicitly set as TRUE then a relaxed version of the vali...
492	SE_RegisterVectorCoverage	样式和图层注册	语法：SE_RegisterVectorCoverage( coverage_name String , f_table_name String , f_geometry_column String ) : Integer ； SE_RegisterVectorCoverage( coverage_name String , f_table_name String , f_geometry_column String , title S...；官方摘要：libxml2；Creates a Vector Coverage based on an already existing Spatial Table. coverage_name is the symbolic name uniquely identifying each Vector Coverage ( Primary Key ). f_tab...
493	SE_RegisterSpatialViewCoverage	样式和图层注册	语法：SE_RegisterSpatialViewCoverage( coverage_name String , view_name String , view_geometry String ) : Integer ； SE_RegisterSpatialViewCoverage( coverage_name String , view_name String , view_geometry String , title Strin...；官方摘要：libxml2；Creates a Vector Coverage based on an already existing Spatial View. coverage_name is the symbolic name uniquely identifying each Vector Coverage ( Primary Key ). view_n...
494	SE_RegisterVirtualTableCoverage	样式和图层注册	语法：SE_RegisterVirtualTableCoverage( coverage_name String , virt_name String , virt_geometry String ) : Integer ； SE_RegisterVirtualTableCoverage( coverage_name String , virt_name String , virt_geometry String , title Str...；官方摘要：libxml2；Creates a Vector Coverage based on an already existing Virtual Table of the VirtualShape or VirtualGeoJSON type. coverage_name is the symbolic name uniquely identifying ...
495	SE_RegisterTopoGeoCoverage	样式和图层注册	语法：SE_RegisterTopoGeoCoverage( coverage_name String , topology_name String ) : Integer ； SE_RegisterTopoGeoCoverage( coverage_name String , topology_name String , title String , abstract String ) : Integer ； SE_RegisterT...；官方摘要：libxml2；Creates a Vector Coverage based on an already existing Topology-Geometry. coverage_name is the symbolic name uniquely identifying each Vector Coverage ( Primary Key ). t...
496	SE_RegisterTopoNetCoverage	样式和图层注册	语法：SE_RegisterTopoNetCoverage( coverage_name String , network_name String ) : Integer ； SE_RegisterTopoNetCoverage( coverage_name String , network_name String , title String , abstract String ) : Integer ； SE_RegisterTop...；官方摘要：libxml2；Creates a Vector Coverage based on an already existing Topology-Network. coverage_name is the symbolic name uniquely identifying each Vector Coverage ( Primary Key ). to...
497	SE_UnregisterVectorCoverage	样式和图层注册	语法：SE_UnregisterVectorCoverage( coverage_name String ) : Integer；官方摘要：libxml2；Completely removes an already defined Vector Coverage this including any furher depency; the underlying Spatial Table will be absolutely unaffected. coverage_name must i...
498	SE_SetVectorCoverageInfos	样式和图层注册	语法：SE_SetVectorCoverageInfos( coverage_name String , title String , abstract String ) : Integer ； SE_SetVectorCoverageInfos( coverage_name String , title String , abstract String , is_queryable Boolen , is_editable Boole...；官方摘要：libxml2；Updates the descriptive infos associated to a Vector Coverage . coverage_name must identify an existing Vector Coverage. title and abstract represent the descriptive inf...
499	SE_SetVectorCoverageCopyright	样式和图层注册	语法：SE_SetVectorCoverageCopyright( coverage_name String , copyright String ) : Integer ； SE_SetVectorCoverageCopyright( coverage_name String , copyright String , license String ): Integer；官方摘要：libxml2；Updates Copyright and License infos associated to a Vector Coverage . coverage_name must identify an existing Vector Coverage. copyright identifies the Copyright holder;...
500	SE_SetVectorCoverageVisibilityRange	样式和图层注册	语法：SE_SetVectorCoverageVisibilityRange( coverage_name String , minScaleDenominator Double , maxScaleDenominator Double ): Integer；官方摘要：libxml2；Updates the Visibility Scale Range associated to a Vector Coverage . coverage_name must identify an existing Vector Coverage. minScaleDenominator and maxScaleDenominator...
501	SE_RegisterVectorCoverageSrid	样式和图层注册	语法：SE_RegisterVectorCoverageSrid( coverage_name String , srid Integer ) : Integer；官方摘要：libxml2；Adds an alternative SRID to an already defined Vector Coverage. coverage_name must identify an existing Vector Coverage. srid is expected to match the corresponding entr...
502	SE_UnregisterVectorCoverageSrid	样式和图层注册	语法：SE_UnregisterVectorCoverageSrid( coverage_name String , srid Integer ) : Integer；官方摘要：libxml2；Removes an already defined alternative SRID from a Vector Coverage. coverage_name and srid must identify some previously defined alternative SRID. ； the return type is I...
503	SE_UpdateVectorCoverageExtent	样式和图层注册	语法：SE_UpdateVectorCoverageExtent() : Integer ； SE_UpdateVectorCoverageExtent( transaction Integer ) : Integer ； SE_UpdateVectorCoverageExtent( coverage_name String ) : Integer ； SE_UpdateVectorCoverageExtent( coverage_na...；官方摘要：libxml2；Updates the Extent boundary supporting a Vector Coverage, this including any eventually defined alternative SRID. if the optional coverage_name argument is set then only...
504	SE_RegisterVectorCoverageKeyword	样式和图层注册	语法：SE_RegisterVectorCoverageeKeyword( coverage_name String , keyword String ) : Integer；官方摘要：libxml2；Adds a keyword to an already defined Vector Coverage. coverage_name must identify an existing Vector Coverage. keyword must not be already defined for the same Coverage...
505	SE_UnregisterVectorCoverageKeyword	样式和图层注册	语法：SE_UnregisterVectorCoverageKeyword( coverage_name String , keyword String ) : Integer；官方摘要：libxml2；Removes an already defined keyword from a Vector Coverage. coverage_name and keyword must identify some previously defined keyword. ； the return type is Integer, with a ...
506	SE_AutoRegisterStandardBrushes	样式和图层注册	语法：SE_AutoRegisterStandardBrushes( ) : NULL；官方摘要：libxml2；Inserts all Graphic Standard Brushes supported by RasterLite2 (if not already inserted).； Will be automatically invoked by CreateStylingTables() .
507	SE_RegisterExternalGraphic	样式和图层注册	语法：SE_RegisterExternalGraphic( xlink_href String , resource BLOB ) : Integer ； SE_RegisterExternalGraphic( xlink_href String , resource BLOB , title String , abstract String , file_name String ) : Integer；官方摘要：libxml2；Inserts (or updates) an External Graphic Resource . xlink_href uniquely identifies each Resource ( Primary Key ). resource is expected to be a BLOB containing an image/g...
508	SE_UnregisterExternalGraphic	样式和图层注册	语法：SE_UnregisterExternalGraphic( xlink_href String ) : Integer；官方摘要：libxml2；Deletes an already existing External Graphic Resource . xlink_href the External Resource to be deleted. ； the return type is Integer, with a return value of 1 for TRUE (...
509	SE_RegisterVectorStyle	样式和图层注册	语法：SE_RegisterVectorStyle( style BLOB ) : Integer；官方摘要：libxml2；Inserts a new Vector Style definition. style is expected to be an XmlBLOB containing a valid SLD/SE Style of the Vector type.； If CreateStylingTables() was invoked witho...
510	SE_UnregisterVectorStyle	样式和图层注册	语法：SE_UnregisterVectorStyle( style_id Integer , remove_all Integer ) : Integer ； SE_UnregisterVectorStyle( style_name Text , remove_all Integer ) : Integer；官方摘要：libxml2；Removes an already registered Vector Style definition. The Style to be removed could be referenced either by its unique Style Id or by its Style Name .； Any attempt to r...
511	SE_ReloadVectorStyle	样式和图层注册	语法：SE_ReloadVectorStyle( style_id Integer , style BLOB ) : Integer ； SE_ReloadVectorStyle( style_name Text , style BLOB ) : Integer；官方摘要：libxml2；Updates an already existing Vector Style definition. style is expected to be an XmlBLOB containing a valid SLD/SE Style of the Vector type.； If CreateStylingTables() was...
512	SE_RegisterVectorStyledLayer	样式和图层注册	语法：SE_RegisterVectorStyledLayer( coverage_name String , style_id Integer ) : Integer ； SE_RegisterVectorStyledLayer( coverage_name String , style_name Text ) : Integer；官方摘要：libxml2；Associates a Vector Style to a Vector Styled Layer . coverage_name must identify an existing Vector Layer. An already registered Style can be referenced either by its un...
513	SE_UnregisterVectorStyledLayer	样式和图层注册	语法：SE_UnregisterVectorStyledLayer( coverage_name String , style_id Integer ) : Integer ； SE_UnregisterVectorStyledLayer( coverage_name String , style_name Text ) : Integer；官方摘要：libxml2；Removes an association between a Vector Style and a Vector Styled Layer . coverage_name must identify an existing Vector Layer. An already associated Style can be refere...
514	SE_RegisterRasterStyle	样式和图层注册	语法：SE_RegisterRasterStyle( style BLOB ) : Integer；官方摘要：libxml2；Inserts a new Raster Style definition. style is expected to be an XmlBLOB containing a valid SLD/SE Style of the Raster type.； If CreateStylingTables() was invoked witho...
515	SE_UnregisterRasterStyle	样式和图层注册	语法：SE_UnregisterRasterStyle( style_id Integer , remove_all Integer ) : Integer ； SE_UnregisterRasterStyle( style_name Text , remove_all Integer ) : Integer；官方摘要：libxml2；Removes an already registered Raster Style definition. The Style to be removed could be referenced either by its unique Style Id or by its Style Name .； Any attempt to r...
516	SE_ReloadRasterStyle	样式和图层注册	语法：SE_ReloadRasterStyle( style_id Integer , style BLOB ) : Integer ； SE_ReloadRasterStyle( style_name Text , style BLOB ) : Integer；官方摘要：libxml2；Updates an already existing Raster Style definition. style is expected to be an XmlBLOB containing a valid SLD/SE Style of the Raster type.； If CreateStylingTables() was...
517	SE_RegisterRasterStyledLayer	样式和图层注册	语法：SE_RegisterRasterStyledLayer( coverage_name String , style_id Integer ) : Integer ； SE_RegisterRasterStyledLayer( coverage_name String , style_name Text ) : Integer；官方摘要：libxml2；Associates a Raster Style to a Raster Styled Layer . coverage_name must identify an existing Raster Layer. An already registered Style can be referenced either by its un...
518	SE_UnregisterRasterStyledLayer	样式和图层注册	语法：SE_UnregisterRasterStyledLayer( coverage_name String , style_id Integer ) : Integer ； SE_UnregisterRasterStyledLayer( coverage_name String , style_name Text ) : Integer；官方摘要：libxml2；Removes an association between a Raster Style and a Raster Styled Layer . coverage_name must identify an existing Raster Layer. An already associated Style can be refere...
519	SE_RegisterRasterCoverageSrid	样式和图层注册	语法：SE_RegisterRasterCoverageSrid( coverage_name String , srid Integer ) : Integer；官方摘要：libxml2；Adds an alternative SRID to an already defined Raster Coverage. coverage_name must identify an existing Raster Coverage. srid is expected to match the corresponding entr...
520	SE_UnregisterRasterCoverageSrid	样式和图层注册	语法：SE_UnregisterRasterCoverageSrid( coverage_name String , srid Integer ) : Integer；官方摘要：libxml2；Removes an already defined alternative SRID from a Raster Coverage. coverage_name and srid must identify some previously defined alternative SRID. ； the return type is I...
521	SE_UpdateRasterCoverageExtent	样式和图层注册	语法：SE_UpdateRasterCoverageExtent() : Integer ； SE_UpdateRasterCoverageExtent( transaction Integer ) : Integer ； SE_UpdateRasterCoverageExtent( coverage_name String ) : Integer ； SE_UpdateRasterCoverageExtent( coverage_na...；官方摘要：libxml2；Updates the Extent boundary supporting a Raster Coverage, this including any eventually defined alternative SRID. if the optional coverage_name argument is set then only...
522	SE_RegisterRasterCoverageKeyword	样式和图层注册	语法：SE_RegisterRasterCoverageKeyword( coverage_name String , keyword String ) : Integer；官方摘要：libxml2；Adds a keyword to an already defined Raster Coverage. coverage_name must identify an existing Raster Coverage. keyword must not be already defined for the same Coverage...
523	SE_UnregisterRasterCoverageKeyword	样式和图层注册	语法：SE_UnregisterRasterCoverageKeyword( coverage_name String , keyword String ) : Integer；官方摘要：libxml2；Removes an already defined keyword from a Raster Coverage. coverage_name and keyword must identify some previously defined keyword. ； the return type is Integer, with a ...
524	RL2_RegisterMapConfiguration	样式和图层注册	语法：RL2_RegisterMapConfiguration( config BLOB ) : Integer；官方摘要：libxml2；Inserts a new RL2 Map Configuration definition. config is expected to be an XmlBLOB containing a valid RL2 Map Configuration.； If CreateStylingTables() was invoked witho...
525	RL2_UnregisterMapConfiguration	样式和图层注册	语法：RL2_UnregisterMapConfiguration( config_id Integer ) : Integer ； RL2_UnregisterMapConfiguration( config_name Text ) : Integer；官方摘要：libxml2；Removes an already registered RL2 Map Configuration definition. The Map Configuration to be removed could be referenced either by its unique Config Id or by its Config N...
526	RL2_ReloadMapConfiguration	样式和图层注册	语法：RL2_ReloadMapConfiguration( config_id Integer , config BLOB ) : Integer ； RL2_ReloadMapConfiguration( config_name Text , config BLOB ) : Integer；官方摘要：libxml2；Updates an already existing RL2 Map Configuration definition. config is expected to be an XmlBLOB containing a valid RL2 Map Configuration.； If CreateStylingTables() was...
527	RL2_NumMapConfigurations	样式和图层注册	语法：RL2_NumMapConfigurations() : Integer；官方摘要：libxml2；Will return the total number of registered RL2 Map Configuration objects.； The return type is Integer; 0 will be returned if no registered Map Configuration exists, -1 w...
528	RL2_MapConfigurationNameN	样式和图层注册	语法：RL2_MapConfigurationNameN( index Integer ) : Text；官方摘要：libxml2；Will return the name of the registered RL2 Map Configuration object corresponding to the index (1-based).； NULL will be returned on invalid argument or on error.
529	RL2_MapConfigurationTitleN	样式和图层注册	语法：RL2_MapConfigurationTitleN( index Integer ) : Text；官方摘要：libxml2；Will return the title of the registered RL2 Map Configuration object corresponding to the index (1-based).； NULL will be returned on invalid argument or on error.
530	RL2_MapConfigurationAbstractN	样式和图层注册	语法：RL2_MapConfigurationAbstractN( index Integer ) : Text；官方摘要：libxml2；Will return the abstract of the registered RL2 Map Configuration object corresponding to the index (1-based).； NULL will be returned on invalid argument or on error.

9.41 SQL functions supporting ISO Metadata

序号	函数名	函数功能	详细说明
531	CreateIsoMetadataTables	ISO 元数据	语法：CreateIsoMetadataTables() : Integer ； CreateIsoMetadataTables( relaxed Integer ) : Integer；官方摘要：libxml2；Creates a set of tables supporting ISO Metadata . if the optional argument relaxed is specified (any value), then a relaxed version of the validating Triggers will be in...
532	ReCreateIsoMetaRefsTriggers	ISO 元数据	语法：ReCreateIsoMetaRefsTriggers() : Integer ； ReCreateIsoMetaRefsTriggers( enable_eval Integer ) : Integer；官方摘要：libxml2；Drops and creates again two Triggers supporting the ISO_metadata_reference table. the optional argument enable_eval chooses wich type of validating Triggers will be inst...
533	RegisterIsoMetadata	ISO 元数据	语法：RegisterIsoMetadata( scope String , metadata BLOB ) : Integer ； RegisterIsoMetadata( scope String , metadata BLOB , id Integer ) : Integer ； RegisterIsoMetadata( scope String , metadata BLOB , fileIdentifier String ) ...；官方摘要：libxml2；Inserts (or updates) an ISO Metadata definition. scope can be one of undefined , fieldSession , collectionSession , series , dataset , featureType , feature , attributeT...
534	GetIsoMetadataId	ISO 元数据	语法：GetIsoMetadataId( fileIdentifier String ) : Integer；官方摘要：libxml2；Return the unique id corresponding to the ISO Metadata definition identified by fileIdentifier .； If no corresponding ISO Metadata definition exists, this function will ...

9.42 SQL functions implementing FDO/OGR compatibility

序号	函数名	函数功能	详细说明
535	CheckSpatialMetaData	FDO/OGR 兼容	语法：CheckSpatialMetaData( void ) : Integer ； CheckSpatialMetaData( db_prefix String ) : Integer；官方摘要：base；Checks the Spatial Metadata type, then returning: -1 - on invalid args or if no ATTACHED-DB identified by db_prefix exists. 0 - if the geometry_columns or spatial_ref_sys t...
536	AutoFDOStart	FDO/OGR 兼容	语法：AutoFDOStart( void ) : Integer ； AutoFDOStart( db_prefix String ) : Integer；官方摘要：base；This function will inspect the Spatial Metadata, then automatically creating/refreshing a VirtualFDO wrapper for each FDO/OGR geometry table； the return type is Integer [ho...
537	AutoFDOStop	FDO/OGR 兼容	语法：AutoFDOStop( void ) : Integer ； AutoFDOStop( db_prefix String ) : Integer；官方摘要：base；This function will inspect the Spatial Metadata, then automatically destroying any VirtualFDO wrapper found； the return type is Integer [how many VirtualFDO tables have bee...
538	InitFDOSpatialMetaData	FDO/OGR 兼容	语法：InitFDOSpatialMetaData( void ) : Integer；官方摘要：base；Creates the geometry_columns and spatial_ref_sys metadata tables； the return type is Integer, with a return value of 1 for TRUE or 0 for FALSE； Please note: Spatial Metadat...
539	AddFDOGeometryColumn	FDO/OGR 兼容	语法：AddFDOGeometryColumn( table String , column String , srid Integer , geom_type Integer , dimension Integer , geometry_format String ) : Integer；官方摘要：base；Creates a new geometry column updating the FDO/OGR Spatial Metadata tables； geom_type has to be one of the followings: 1 POINT 2 LINESTRING 3 POLYGON 4 MULTIPOINT 5 MULTILI...
540	RecoverFDOGeometryColumn	FDO/OGR 兼容	语法：RecoverFDOGeometryColumn( table String , column String , srid Integer , geom_type String , dimension Integer , geometry_format String ) : Integer；官方摘要：base；Validates an existing ordinary column in order to possibly transform it in a real geometry column , thus updating the FDO/OGR Spatial Metadata tables； the return type is In...
541	DiscardFDOGeometryColumn	FDO/OGR 兼容	语法：DiscardFDOGeometryColumn( table String , column String ) : Integer；官方摘要：base；Removes a geometry column from FDO/OGR Spatial MetaData tables； the column itself still continues to exist untouched as an ordinary column； the return type is Integer, with...

9.43 SQL functions implementing OGC GeoPackage compatibility

序号	函数名	函数功能	详细说明
542	CheckGeoPackageMetaData	GeoPackage 兼容	语法：CheckGeoPackageMetaData( void ) : Integer ； CheckGeoPackageMetaData ( db_prefix String ) : Integer；官方摘要：base；This function will inspect the DB layout checking if it corresponds to the GPKG own style.； The optional db_prefix argument specifies which one of the ATTACHED databases is...
543	AutoGPKGStart	GeoPackage 兼容	语法：AutoGPKGStart( void ) : Integer ； AutoGPKGStart( db_prefix String ) : Integer；官方摘要：GeoPackage；This function will inspect the DB layout, then automatically creating/refreshing a VirtualGPKG wrapper for each GPKG geometry table； the return type is Integer [how m...
544	AutoGPKGStop	GeoPackage 兼容	语法：AutoGPKGStop( void ) : Integer ； AutoGPKGStop( db_prefix String ) : Integer；官方摘要：GeoPackage；This function will inspect the DB layout, then automatically destroying any VirtualGPKG wrapper found； the return type is Integer [how many VirtualGPKG tables have be...
545	gpkgCreateBaseTables	GeoPackage 兼容	语法：gpkgCreateBaseTables( void ) : void；官方摘要：GeoPackage；This function will create base tables for an "empty" GeoPackage； returns nothing on success, raises exception on error
546	gpkgInsertEpsgSRID	GeoPackage 兼容	语法：gpkgInsertEpsgSRID( srid Integer ) : void；官方摘要：GeoPackage；This function will add a spatial reference system entry for the specified EPSG identifier; it is an error to try to add the entry if it already exists； returns nothin...
547	gpkgCreateTilesTable	GeoPackage 兼容	语法：gpkgCreateTilesTable( tile_table_name String , srid Integer , min_x Double precision , min_y Double precision , max_x Double precision , max_y Double precision ) : void；官方摘要：GeoPackage；This function will create a new (empty) Tiles table and the triggers for that table; It also adds in the matching entries into gpkg_contents and gpkg_tile_matrix_set...
548	gpkgCreateTilesZoomLevel	GeoPackage 兼容	语法：gpkgCreateTilesZoomLevel( tile_table_name String , zoom_level Integer , extent_width Double precision , extent_height Double precision ) : void；官方摘要：GeoPackage；This function will add a zoom level for the specified table.； This function assumes usual tile conventions, including that the tiles are power-of-two-zoom, 256x256 pi...
549	gpkgAddTileTriggers	GeoPackage 兼容	语法：gpkgAddTileTriggers( tile_table_name String ) : void；官方摘要：GeoPackage；This function will add Geopackage tile table triggers for the named table.； returns nothing on success, raises exception on error
550	gpkgGetNormalZoom	GeoPackage 兼容	语法：gpkgGetNormalZoom( tile_table_name String , inverted_zoom_level Integer ) : Integer；官方摘要：GeoPackage；This function will return the normal integer zoom level for data stored in the specified table.； Note that this function can also be used to convert from a normal zoo...
551	gpkgGetNormalRow	GeoPackage 兼容	语法：gpkgGetNormalRow( tile_table_name String , normal_zoom_level Integer , inverted_row_number Integer ) : Integer；官方摘要：GeoPackage；This function will return the normal integer row number for the specified table, normal zoom level and inverted row number.； Note that this function can also be used ...
552	gpkgGetImageType	GeoPackage 兼容	语法：gpkgGetImageType( image Blob ) : String；官方摘要：GeoPackage；This function will return the image type (as a string) of the blob argument, or "unknown" if the image type is not one of the PNG, JPEG, TIFF or WebP format types tha...
553	gpkgAddGeometryColumn	GeoPackage 兼容	语法：gpkgAddGeometryColumn( table_name String , geometry_column_name String , geometry_type String , with_z Integer , with_m Integer , srs_id Integer ) : void；官方摘要：GeoPackage；Adds a geometry column to the specified table: geometry_type is a normal WKT name: "GEOMETRY" "POINT" "LINESTRING" "POLYGON" "MULTIPOINT" "MULTILINESTRING" "MULTIPOLY...
554	gpkgAddGeometryTriggers	GeoPackage 兼容	语法：gpkgAddGeometryTriggers( table_name String , geometry_column_name String ) : void；官方摘要：GeoPackage；This function will add Geopackage geometry table triggers for the named table.； returns nothing on success, raises exception on error
555	gpkgAddSpatialIndex	GeoPackage 兼容	语法：gpkgAddSpatialIndex( table_name String , geometry_column_name String ) : void；官方摘要：GeoPackage；This function will add Geopackage Spatial Index support for the named table.； returns nothing on success, raises exception on error
556	gpkgMakePoint	GeoPackage 兼容	语法：gpkgMakePoint (x Double precision , y Double precision ) : GPKG Blob Geometry ； gpkgMakePoint (x Double precision , y Double precision , srid Integer ) : GPKG Blob Geometry；官方摘要：GeoPackage；This function will create a GeoPackage geometry POINT.； Raises a SQL exception on error
557	gpkgMakePointZ	GeoPackage 兼容	语法：gpkgMakePointZ (x Double precision , y Double precision , z Double precision ) : GPKG Blob Geometry ； gpkgMakePointZ (x Double precision , y Double precision , z Double precision , srid Integer ) : GPKG Blob Geometry；官方摘要：GeoPackage；This function will create a GeoPackage geometry POINT Z.； Raises a SQL exception on error
558	gpkgMakePointM	GeoPackage 兼容	语法：gpkgMakePointM (x Double precision , y Double precision , m Double precision ) : GPKG Blob Geometry ； gpkgMakePointM (x Double precision , y Double precision , m Double precision , srid Integer ) : GPKG Blob Geometry；官方摘要：GeoPackage；This function will create a GeoPackage geometry POINT M.； Raises a SQL exception on error
559	gpkgMakePointZM	GeoPackage 兼容	语法：gpkgMakePointZM (x Double precision , y Double precision , z Double precision , m Double precision ) : GPKG Blob Geometry ； gpkgMakePointZM (x Double precision , y Double precision , z Double precision , m Double prec...；官方摘要：GeoPackage；This function will create a GeoPackage geometry POINT ZM.； Raises a SQL exception on error
560	IsValidGPB	GeoPackage 兼容	语法：IsValidGPB( geom Blob ) : Integer；官方摘要：GeoPackage；This function will inspect a BLOB then checking if it really corresponds to a GPKG own Geometry； the return type is Integer, with a return value of 1 for TRUE, 0 for ...
561	AsGPB	GeoPackage 兼容	语法：AsGPB( geom BLOB encoded geometry ) : GPKG Blob Geometry；官方摘要：GeoPackage；This function will convert a SpatiaLite geometry blob into a GeoPackage format geometry blob.； Will return NULL if any error is encountered
562	GeomFromGPB	GeoPackage 兼容	语法：GeomFromGPB( geom GPKG Blob Geometry ) : BLOB encoded geometry；官方摘要：GeoPackage；This function will convert a GeoPackage format geometry blob into a SpatiaLite geometry blob.； Will return NULL if any error is encountered
563	CastAutomagic	GeoPackage 兼容	语法：CastAutomagic( geom Blob ) : BLOB encoded geometry；官方摘要：GeoPackage；This function will indifferently accept on input: a SpatiaLite own BLOB Geometry a GPKG own BLOB Geometry then returning a SpatiaLite own BLOB geometry.； Will return ...
564	GPKG_IsAssignable	GeoPackage 兼容	语法：GPKG_IsAssignable( expected_type_name String , actual_type_name String ) : Integer；官方摘要：GeoPackage；This function will check if expected_type is the same or is a super-type of actual_type ; this function is required by the standard implementation of GPKG Geometry va...

9.44 SQL functions for MbrCache-based queries

序号	函数名	函数功能	详细说明
565	FilterMbrWithin	MbrCache 查询过滤	语法：FilterMbrWithin( x1 Double precision , y1 Double precision , x2 Double precision , y2 Double precision )；官方摘要：base；Retrieves from an MbrCache any entity whose MBR falls within the rectangle identified by extreme points x1 y1 and x2 y2
566	FilterMbrContains	MbrCache 查询过滤	语法：FilterMbrContains( x1 Double precision , y1 Double precision , x2 Double precision , y2 Double precision )；官方摘要：base；Retrieves from an MbrCache any entity whose MBR contains the rectangle identified by extreme points x1 y1 and x2 y2
567	FilterMbrIntersects	MbrCache 查询过滤	语法：FilterMbrIntersects( x1 Double precision , y1 Double precision , x2 Double precision , y2 Double precision )；官方摘要：base；Retrieves from an MbrCache any entity whose MBR intersects the rectangle identified by extreme points x1 y1 and x2 y2
568	BuildMbrFilter	MbrCache 查询过滤	语法：BuildMbrFilter( x1 Double precision , y1 Double precision , x2 Double precision , y2 Double precision )；官方摘要：base；Creates an MBR identified by extreme points x1 y1 and x2 y2 ； This fuction is used internally by triggers related to MbrCache management, and is not intended for any other ...

9.45 SQL functions supporting XmlBLOB

序号	函数名	函数功能	详细说明
569	XB_Create	XML BLOB 读写、压缩和校验	语法：XB_Create( xmlPayload BLOB ) : XmlBLOB ； XB_Create( xmlPayload BLOB , compressed Boolean ) : XmlBLOB ； XB_Create( xmlPayload BLOB , compressed Boolean , schemaURI Text ) : XmlBLOB ； XB_Create( xmlPayload BLOB , compre...；官方摘要：libxml2；Construct an XmlBLOB object starting from an XmlDocument. If compressed is set to TRUE the XmlBlob object will be compressed (default setting). If schemaURI is specified...
570	XB_GetPayload	XML BLOB 读写、压缩和校验	语法：XB_GetPayload( xmlObject XmlBLOB , indent Integer ) : BLOB；官方摘要：libxml2；Extracts a generic BLOB from an XmlBLOB object, exactly corresponding to the original XmlDocument and fully preserving the original character encoding.； If the optional ...
571	XB_GetDocument	XML BLOB 读写、压缩和校验	语法：XB_GetDocument( xmlObject XmlBLOB , indent Integer ) : String；官方摘要：libxml2；Extracts an XmlDocument from an XmlBLOB object; the returned XmlDocument will always be UTF-8 encoded ( TEXT ), irrespectively from the original internal encoding declar...
572	XB_SchemaValidate	XML BLOB 读写、压缩和校验	语法：XB_SchemaValidate( xmlObject XmlBLOB , schemaURI Text , compressed Boolean ) : XmlBLOB ； XB_SchemaValidate( xmlObject XmlBLOB , internalSchemaURI Boolean , compressed Boolean ) : XmlBLOB；官方摘要：libxml2；Construct an XML validated XmlBLOB object starting from an XmlDocument. If compressed is set to TRUE the XmlBlob object will be compressed (default setting). If schemaUR...
573	XB_Compress	XML BLOB 读写、压缩和校验	语法：XB_Compress( xmlObject XmlBLOB ) : XmlBLOB；官方摘要：libxml2；A new compressed XmlBLOB object will be returned.； If the input XmlBLOB is already compressed this one is a harmless no-op.； NULL will be returned for any invalid input ...
574	XB_Uncompress	XML BLOB 读写、压缩和校验	语法：XB_Uncompress( xmlObject XmlBLOB ) : XmlBLOB；官方摘要：libxml2；A new uncompressed XmlBLOB object will be returned.； If the input XmlBLOB is already uncompressed this one is a harmless no-op.； NULL will be returned for any invalid in...
575	XB_IsValid	XML BLOB 读写、压缩和校验	语法：XB_IsValid( xmlObject XmlBLOB ) : Integer；官方摘要：libxml2；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL argument.
576	XB_IsCompressed	XML BLOB 读写、压缩和校验	语法：XB_IsCompressed( xmlObject XmlBLOB ) : Integer；官方摘要：libxml2；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL argument.
577	XB_IsSchemaValidated	XML BLOB 读写、压缩和校验	语法：XB_IsSchemaValidated( xmlObject XmlBLOB ) : Integer；官方摘要：libxml2；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL argument.
578	XB_IsIsoMetadata	XML BLOB 读写、压缩和校验	语法：XB_IsIsoMetadata( xmlObject XmlBLOB ) : Integer；官方摘要：libxml2；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL argument.
579	XB_IsSldSeVectorStyle	XML BLOB 读写、压缩和校验	语法：XB_IsSldSeVectorStyle( xmlObject XmlBLOB ) : Integer；官方摘要：libxml2；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL argument.
580	XB_IsSldSeRasterStyle	XML BLOB 读写、压缩和校验	语法：XB_IsSldSeRasterStyle( xmlObject XmlBLOB ) : Integer；官方摘要：libxml2；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL argument.
581	XB_IsSldStyle	XML BLOB 读写、压缩和校验	语法：XB_IsSldStyle( xmlObject XmlBLOB ) : Integer；官方摘要：libxml2；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL argument.
582	XB_IsSvg	XML BLOB 读写、压缩和校验	语法：XB_IsSvg( xmlObject XmlBLOB ) : Integer；官方摘要：libxml2；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL argument.
583	XB_IsGpx	XML BLOB 读写、压缩和校验	语法：XB_IsGpx( xmlObject XmlBLOB ) : Integer；官方摘要：libxml2；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL argument.
584	XB_IsMapConfig	XML BLOB 读写、压缩和校验	语法：XB_IsMapConfig( xmlObject XmlBLOB ) : Integer；官方摘要：libxml2；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL argument.
585	XB_GetDocumentSize	XML BLOB 读写、压缩和校验	语法：XB_GetDocumentSize( xmlObject XmlBLOB ) : Integer；官方摘要：libxml2；Will return the size in bytes of the corresponding uncompressed XmlDocument.； NULL will be returned for any invalid input (not a valid XmlBLOB object).
586	XB_GetEncoding	XML BLOB 读写、压缩和校验	语法：XB_GetEncoding( xmlObject XmlBLOB ) : String；官方摘要：libxml2；Will return the character encoding internally declared by the XmlDocument corresponding to the input XmlBLOB.； NULL will be returned for any invalid input (not a valid X...
587	XB_GetSchemaURI	XML BLOB 读写、压缩和校验	语法：XB_GetSchemaURI( xmlObject XmlBLOB ) : String；官方摘要：libxml2；Will return the Schema URI effectively used to validate an XmlBLOB.； NULL will be returned for any invalid input (not a valid XmlBLOB object), or when the XmlBLOB isn't ...
588	XB_GetInternalSchemaURI	XML BLOB 读写、压缩和校验	语法：XB_GetInternalSchemaURI( xmlPayload BLOB ) : String；官方摘要：libxml2；Will return the Schema URI internally declared by the input XmlDocument ( xsi:noNamespeceSchemaLocation or xsi:schemaLocation ).； NULL will be returned for any invalid i...
589	XB_GetFileId	XML BLOB 读写、压缩和校验	语法：XB_GetFileId( xmlObject XmlBLOB ) : String；官方摘要：libxml2；Will return the FileIdentifier defined within the XmlBLOB (if any).； NULL will be returned for any invalid input (not a valid XmlBLOB object), or when no FileIdentifier ...
590	XB_SetFileId	XML BLOB 读写、压缩和校验	语法：XB_SetFileId( xmlObject XmlBLOB , fileId String ) : XmlBLOB；官方摘要：libxml2；Will return a new XmlBLOB by replacing the FileIdentifier value.； The input XmlBLOB is expected to be of the ISO Metadata type and must containt an already defined FileI...
591	XB_AddFileId	XML BLOB 读写、压缩和校验	语法：XB_AddFileId( xmlObject XmlBLOB , fileId String , IdNameSpacePrefix String , IdNameSpaceURI String , CsNameSpacePrefix String , CsNameSpaceURI String ) : XmlBLOB；官方摘要：libxml2；Will return a new XmlBLOB by inserting a FileIdentifier value.； The input XmlBLOB is expected to be of the ISO Metadata type and must not containt an already defined Fil...
592	XB_GetParentId	XML BLOB 读写、压缩和校验	语法：XB_GetParentId( xmlObject XmlBLOB ) : String；官方摘要：libxml2；Will return the ParentIdentifier defined within the XmlBLOB (if any).； NULL will be returned for any invalid input (not a valid XmlBLOB object), or when no ParentIdentif...
593	XB_SetParentId	XML BLOB 读写、压缩和校验	语法：XB_SetParentId( xmlObject XmlBLOB , parentId String ) : XmlBLOB；官方摘要：libxml2；Will return a new XmlBLOB by replacing the ParentIdentifier value.； The input XmlBLOB is expected to be of the ISO Metadata type and must containt an already defined Par...
594	XB_AddParentId	XML BLOB 读写、压缩和校验	语法：XB_AddParentId( xmlObject XmlBLOB , parentId String , IdNameSpacePrefix String , IdNameSpaceURI String , CsNameSpacePrefix String , CsNameSpaceURI String ) : XmlBLOB；官方摘要：libxml2；Will return a new XmlBLOB by inserting a ParentIdentifier value.； The input XmlBLOB is expected to be of the ISO Metadata type and must not containt an already defined P...
595	XB_GetTitle	XML BLOB 读写、压缩和校验	语法：XB_GetTitle( xmlObject XmlBLOB ) : String；官方摘要：libxml2；Will return the Title defined within the XmlBLOB (if any).； NULL will be returned for any invalid input (not a valid XmlBLOB object), or when no Title is defined.；Suppor...
596	XB_GetAbstract	XML BLOB 读写、压缩和校验	语法：XB_GetAbstract( xmlObject XmlBLOB ) : String；官方摘要：libxml2；Will return the Abstract defined within the XmlBLOB (if any).； NULL will be returned for any invalid input (not a valid XmlBLOB object), or when no Abstract is defined.；...
597	XB_GetGeometry	XML BLOB 读写、压缩和校验	语法：XB_GetGeometry( xmlObject XmlBLOB ) : Geometry；官方摘要：libxml2；Will return the Geometry (Bounding Box) defined within the XmlBLOB (if any).； NULL will be returned for any invalid input (not a valid XmlBLOB object), or when no Boundi...
598	XB_MLineFromGPX	XML BLOB 读写、压缩和校验	语法：XB_MLineFromGPX( xmlObject XmlBLOB ) : Geometry；官方摘要：libxml2；Will return a Geometry of the MULTILINESTRING XYZM type by parsing an XmlBLOB corresponding to a GPX document.； NULL will be returned for any invalid input (not a valid ...
599	XB_GetLastParseError	XML BLOB 读写、压缩和校验	语法：XB_GetLastParseError( void ) : String；官方摘要：libxml2；Will return the most recent XML parsing error (if any).； NULL will be returned if there is no pending parsing error.
600	XB_GetLastValidateError	XML BLOB 读写、压缩和校验	语法：XB_GetLastValidateError( void ) : String；官方摘要：libxml2；Will return the most recent XML validating error (if any).； NULL will be returned if there is no pending validating error.
601	XB_IsValidXPathExpression	XML BLOB 读写、压缩和校验	语法：XB_IsValidXPathExpression( expr Text ) : Integer；官方摘要：libxml2；The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and --1 for UNKNOWN when called with a NULL argument.
602	XB_GetLastXPathError	XML BLOB 读写、压缩和校验	语法：XB_GetLastXPathError( void ) : String；官方摘要：libxml2；Will return the most recent XPath error (if any).； NULL will be returned if there is no pending XPath error.
603	XB_CacheFlush	XML BLOB 读写、压缩和校验	语法：XB_CacheFlush( void ) : Boolean；官方摘要：libxml2；Reset the internal XML Schema cache to its initial empty state.
604	XB_LoadXML	XML BLOB 读写、压缩和校验	语法：XB_LoadXML( filepath-or-URL String ) : BLOB；官方摘要：libxml2；If filepath-or-URL corresponds to some valid local pathname, and the corresponding file (expected to contain a well-formed XML Document) can be actually accessed in read...
605	XB_StoreXML	XML BLOB 读写、压缩和校验	语法：XB_StoreXML( XmlObject XmlBLOB , filepath String ) : Integer ； XB_StoreXML( XmlObject XmlBLOB , filepath String , indent Integer ) : Integer；官方摘要：libxml2；If XmlObject is of the XmlBLOB-type, and if filepath corresponds to some valid pathname (accessible in write/create mode), then the corresponding file will be created/ov...

9.46 SQL functions supporting SRID inspection

序号	函数名	函数功能	详细说明
606	SridIsGeographic	SRID 和 CRS 属性检查	语法：SridIsGeographic( SRID Integer ) : Integer；官方摘要：Will inspect the SRID definitions checking if the SRID is of the Geographic type;； will return 1 (i.e. TRUE ) or 0 (i.e. FALSE ).； NULL will be returned on invalid argument or i...
607	SridIsProjected	SRID 和 CRS 属性检查	语法：SridIsProjected( SRID Integer ) : Integer；官方摘要：Will inspect the SRID definitions checking if the SRID is of the Projected type;； will return 1 (i.e. TRUE ) or 0 (i.e. FALSE ).； NULL will be returned on invalid argument or if...
608	SridHasFlippedAxes	SRID 和 CRS 属性检查	语法：SridHasFlippedAxes( SRID Integer ) : Integer；官方摘要：Will inspect the SRID definitions checking if the SRID requires a flipped Axes configuration: i.e. Y,X instead of the most usual X,Y ;； will return 1 (i.e. TRUE ) or 0 (i.e. FAL...
609	SridGetSpheroid	SRID 和 CRS 属性检查	语法：SridGetSpheroid( SRID Integer ) : Text ； SridGetEllipsoid( SRID Integer ) : Text；官方摘要：Will inspect the SRID definitions then returning the appropriate Spheroid name.； NULL will be returned on invalid argument or if the SRID is undefined.
610	SridGetPrimeMeridian	SRID 和 CRS 属性检查	语法：SridGetPrimeMeridian( SRID Integer ) : Text；官方摘要：Will inspect the SRID definitions then returning the appropriate Prime Meridian name.； NULL will be returned on invalid argument or if the SRID is undefined.
611	SridGetDatum	SRID 和 CRS 属性检查	语法：SridGetDatum( SRID Integer ) : Text；官方摘要：Will inspect the SRID definitions then returning the appropriate Datum name.； NULL will be returned on invalid argument or if the SRID is undefined.
612	SridGetUnit	SRID 和 CRS 属性检查	语法：SridGetUnit( SRID Integer ) : Text；官方摘要：Will inspect the SRID definitions then returning the appropriate Unit name.； NULL will be returned on invalid argument or if the SRID is undefined.
613	SridGetProjection	SRID 和 CRS 属性检查	语法：SridGetProjection( SRID Integer ) : Text；官方摘要：Will inspect the SRID definitions then returning the appropriate Projection name.； NULL will be returned on invalid argument or if the SRID is undefined.
614	SridGetAxis_1_Name	SRID 和 CRS 属性检查	语法：SridGetAxis_1_Name( SRID Integer ) : Text；官方摘要：Will inspect the SRID definitions then returning the appropriate Name for its first axis.； NULL will be returned on invalid argument or if the SRID is undefined.
615	SridGetAxis_1_Orientation	SRID 和 CRS 属性检查	语法：SridGetAxis_1_Orientation( SRID Integer ) : Text；官方摘要：Will inspect the SRID definitions then returning the appropriate Orientation for its first axis.； NULL will be returned on invalid argument or if the SRID is undefined.
616	SridGetAxis_2_Name	SRID 和 CRS 属性检查	语法：SridGetAxis_2_Name( SRID Integer ) : Text；官方摘要：Will inspect the SRID definitions then returning the appropriate Name for its second axis.； NULL will be returned on invalid argument or if the SRID is undefined.
617	SridGetAxis_2_Orientation	SRID 和 CRS 属性检查	语法：SridGetAxis_2_Orientation( SRID Integer ) : Text；官方摘要：Will inspect the SRID definitions then returning the appropriate Orientation for its second axis.； NULL will be returned on invalid argument or if the SRID is undefined.

9.47 SQL functions supporting new PROJ.6 API

序号	函数名	函数功能	详细说明
618	PROJ_GetDatabasePath	PROJ.6 CRS 辅助接口	语法：PROJ_GetDatabasePath( void ) : String；官方摘要：Will return the currently set pathname leading to the private PROJ's SQLite database.； NULL will be returned if there is no private PROJ's SQLite database currently connected.； ...
619	PROJ_SetDatabasePath	PROJ.6 CRS 辅助接口	语法：PROJ_SetDatabasePath( new_path String ) : String；官方摘要：Will change the currently set pathname leading to the private PROJ's SQLite database.； NULL will be returned if the passed path is invalid, otherwise the path of the currently s...
620	PROJ_AsProjString	PROJ.6 CRS 辅助接口	语法：PROJ_AsProjString( auth_name String , auth_srid Integer ) : String；官方摘要：Will return the proj-string expression corresponding to a given Reference System; the definitions will be taken directly from the private PROJ's own database. auth_name and auth...
621	PROJ_AsWKT	PROJ.6 CRS 辅助接口	语法：PROJ_AsWKT( auth_name String , auth_srid Integer ) : String ； PROJ_AsWKT( auth_name String , auth_srid Integer , style String ) : String ； PROJ_AsWKT( auth_name String , auth_srid Integer , style String , indented Boo...；官方摘要：Will return the WKT expression corresponding to a given Reference System; the definitions will be taken directly from the private PROJ's own database. auth_name and auth_srid id...
622	PROJ_GuessSridFromWKT	PROJ.6 CRS 辅助接口	语法：PROJ_GuessSridFromWKT( wkt String ) : Integer；官方摘要：Will return the SRID value if any corresponding to a given WKT expression defining a CRS.； -1 will be returned if no CRS supported by PROJ.6 matches the WKT expression.； NULL ...
623	PROJ_GuessSridFromSHP	PROJ.6 CRS 辅助接口	语法：PROJ_GuessSridFromSHP( filename String ) : Integer；官方摘要：Will return the SRID value if any corresponding to the CRS defined by the .PRJ member of the Shapefile.； Note : exactley as required by ImportSHP() filename must define an abs...
624	PROJ_GuessSridFromZipSHP	PROJ.6 CRS 辅助接口	语法：PROJ_GuessSridFromZipSHP( zip_path String , filename String ) : Integer；官方摘要：Will return the SRID value if any corresponding to the CRS defined by the .PRJ member of a zipped Shapefile.； This function is almost the same as PROJ_GuessSridFromSHP() , exc...

9.48 SQL functions supporting Topology-Geometry

序号	函数名	函数功能	详细说明
625	GetLastTopologyException	拓扑节点、边和面	语法：GetLastTopologyException( toponame Text ) : Text；官方摘要：RTTOPO；Will return the most recent exception raised by this Topo-Geo, or NULL if no exception is currently pending.
626	CreateTopoTables	拓扑节点、边和面	语法：CreateTopoTables( ) : Integer；官方摘要：RTTOPO；Will create both topologies and networks meta-tables.； Will return 1 on success) or 0 on failure (including already existing tables).
627	ReCreateTopoTriggers	拓扑节点、边和面	语法：ReCreateTopoTriggers( ) : Integer；官方摘要：RTTOPO；Will (re)create all Triggers supporting both topologies and networks meta-tables.； Will return 1 on success) or 0 on failure (including already existing tables).
628	InitTopoGeo	拓扑节点、边和面	语法：ST_InitTopoGeo( toponame Text ) : Integer；官方摘要：X；RTTOPO；This SQL function is explicitly required by ISO 13249-3 , anyway it's simply implemented as an alias-name for CreateTopology ( toponame ) .； Will return 1 on success) o...
629	CreateTopology	拓扑节点、边和面	语法：CreateTopology( toponame Text ) : Integer ； CreateTopology( toponame Text , srid Integer ) : Integer ； CreateTopology( toponame Text , srid Integer , has_z Boolean ) : Integer ； CreateTopology( toponame Text , srid In...；官方摘要：RTTOPO；Will create all DBMS objects (tables, triggers, indices and alike) required in order to store a separate Topo-Geo. toponame : the individual unique name of this Topo-Geo:...
630	DropTopology	拓扑节点、边和面	语法：DropTopology( toponame Text ) : Integer；官方摘要：RTTOPO；Completely removes a Topo-Geo (and all data it contains) from the DBMS: to be invoked very cautiously and only if you are absolutely sure of what you are doing.； Will ret...
631	AddIsoNode	拓扑节点、边和面	语法：ST_AddIsoNode( toponame Text , face-id Integer , point Geometry ) : Integer；官方摘要：X；RTTOPO；Will add a new isolated Node; face-id is expected to exactly match the ID of the Face containing point ; by passing a NULL face-id the function itself will take care to...
632	MoveIsoNode	拓扑节点、边和面	语法：ST_MoveIsoNode( toponame Text , node-id Integer , point Geometry ) : Text；官方摘要：X；RTTOPO；Will move an isolated Node from a point to another.； Will return a text message on success; an exception will be raised on failure.
633	RemIsoNode	拓扑节点、边和面	语法：ST_RemIsoNode( toponame Text , node-id Integer ) : Text；官方摘要：X；RTTOPO；Will remove an isolated Node.； Will return a text message on success; an exception will be raised on failure.
634	AddIsoEdge	拓扑节点、边和面	语法：ST_AddIsoEdge( toponame Text , startnode-id Integer , endnode-id Integer , linestring Geometry ) : Integer；官方摘要：X；RTTOPO；Will add a new isolated Edge connecting two isolated Nodes.； Will return the ID of the inserted Edge on success; an exception will be raised on failure.
635	ChangeEdgeGeom	拓扑节点、边和面	语法：ST_ChangeEdgeGeom( toponame Text , edge-id Integer , linestring Geometry ) : Text；官方摘要：X；RTTOPO；Will change the geometry of an Edge without affecting Topology relationships.； Will return a text message on success; an exception will be raised on failure.
636	RemIsoEdge	拓扑节点、边和面	语法：ST_RemIsoEdge( toponame Text , edge-id Integer ) : Text；官方摘要：X；RTTOPO；Will remove an isolated Edge.； Will return a text message on success; an exception will be raised on failure.
637	NewEdgesSplit	拓扑节点、边和面	语法：ST_NewEdgesSplit( toponame Text , edge-id Integer , point Geometry ) : Integer；官方摘要：X；RTTOPO；Will split an Edge by creating a new intermediate Node. The original Edge will be deleted and will be replaced by two new Edges.； Will return the ID of the inserted Nod...
638	ModEdgeSplit	拓扑节点、边和面	语法：ST_ModEdgeSplit( toponame Text , edge-id Integer , point Geometry ) : Integer；官方摘要：X；RTTOPO；Will split an Edge by creating a new intermediate Node. The original Edge will be modified and a new Edge will be inserted.； Will return the ID of the inserted Node on ...
639	NewEdgeHeal	拓扑节点、边和面	语法：ST_NewEdgeHeal( toponame Text , edge1-id Integer , edge2-id Integer ) : Integer；官方摘要：X；RTTOPO；Will heal two Edges by deleting the Node connecting them. Both the original Edges will be deleted and will be replaced by a new Edge preserving the same orientation of ...
640	ModEdgeHeal	拓扑节点、边和面	语法：ST_ModEdgeHeal( toponame Text , edge1-id Integer , edge2-id Integer ) : Integer；官方摘要：X；RTTOPO；Will heal two Edges by deleting the Node connecting them. The first Edge provided will be modified and the second deleted.； Will return the ID of the removed Node on su...
641	AddEdgeNewFaces	拓扑节点、边和面	语法：ST_AddEdgeNewFaces( toponame Text , startnode-id Integer , endnode-id Integer , linestring Geometry ) : Integer；官方摘要：X；RTTOPO；Will add a new Edge connecting two Nodes. If this new Edge splits a Face the original Face will be deleted and replaced by two new Faces.； Will return the ID of the ins...
642	AddEdgeModFace	拓扑节点、边和面	语法：ST_AddEdgeModFace( toponame Text , startnode-id Integer , endnode-id Integer , linestring Geometry ) : Integer；官方摘要：X；RTTOPO；Will add a new Edge connecting two Nodes. If this new Edge splits a Face the original Face will be modified and a new Face will be inserted.； Will return the ID of the ...
643	RemEdgeNewFace	拓扑节点、边和面	语法：ST_RemEdgeNewFace( toponame Text , edge-id Integer ) : Integer；官方摘要：X；RTTOPO；Will remove an Edge. If the removed Edge separated two Faces the original Faces will be deleted and replaced by a new Face.； Will return the ID of the inserted Face on ...
644	RemEdgeModFace	拓扑节点、边和面	语法：ST_RemEdgeModFace( toponame Text , edge-id Integer ) : Integer；官方摘要：X；RTTOPO；Will remove an Edge. If the removed Edge separated two Faces one of then will be modified and the other deleted.； Will return the ID of the surviving Face on success; a...
645	GetFaceGeometry	拓扑节点、边和面	语法：ST_GetFaceGeometry( toponame Text , face-id Integer ) : Geometry；官方摘要：X；RTTOPO；Will return the exact Geometry of a Face.； Will return a Polygon on success; an exception will be raised on failure.
646	GetFaceEdges	拓扑节点、边和面	语法：ST_GetFaceEdges( toponame Text , face-id Integer ) : DB-table；官方摘要：X；RTTOPO；Will update a DB-Table containing the ordered list of all Edges delimiting the given Face. The orientation will always be counterclockwise, and all Edges traversed in t...
647	ValidateTopoGeo	拓扑节点、边和面	语法：ST_ValidateTopoGeo( toponame Text ) : DB-table；官方摘要：X；RTTOPO；Will create a DB-Table containing a validation report for the given TopoGeo: if the output table is empty and no exception was raised the Topology is assumed to be full...
648	CreateTopoGeo	拓扑节点、边和面	语法：ST_CreateTopoGeo( toponame Text , geometry BLOB )；官方摘要：X；RTTOPO；Will populate a full Topology by importing a collection of arbitrary Geometries.； The destination Topology must already exists and must be empty; both SRID and dimensio...
649	GetNodeByPoint	拓扑节点、边和面	语法：GetNodeByPoint( toponame Text , point Geometry ) : Integer ； GetNodeByPoint( toponame Text , point Geometry , tolerance Double precision ) : Integer；官方摘要：RTTOPO；Will attempt to find the ID of a Node located at Point. The optional argument tolerance if omitted will assume the corresponding value declared when creating the target T...
650	GetEdgeByPoint	拓扑节点、边和面	语法：GetEdgeByPoint( toponame Text , point Geometry ) : Integer ； GetEdgeByPoint( toponame Text , point Geometry , tolerance Double precision ) : Integer；官方摘要：RTTOPO；Will attempt to find the ID of an Edge intersecting the given Point. The optional argument tolerance if omitted will assume the corresponding value declared when creating...
651	GetFaceByPoint	拓扑节点、边和面	语法：GetFaceByPoint( toponame Text , point Geometry ) : Integer ； GetFaceByPoint( toponame Text , point Geometry , tolerance Double precision ) : Integer；官方摘要：RTTOPO；Will attempt to find the ID of a Face intersecting the given Point. The optional argument tolerance if omitted will assume the corresponding value declared when creating ...
652	TopoGeo_AddPoint	拓扑节点、边和面	语法：TopoGeo_AddPoint( toponame Text , point Geometry ) : Text ； TopoGeo_AddPoint( toponame Text , point Geometry , tolerance Double precision ) : Text；官方摘要：RTTOPO；Will attempt to add a Point (or even a MultiPoint ) to an already existing Topology, possibly splitting existing Edges. The optional argument tolerance if omitted will as...
653	TopoGeo_AddLineString	拓扑节点、边和面	语法：TopoGeo_AddLineString( toponame Text , linestring Geometry ) : Integer ； TopoGeo_AddLineString( toponame Text , linestring Geometry , tolerance Double precision ) : Text；官方摘要：RTTOPO；Will attempt to add a Linestring (or even a MultiLinestring ) to an already existing Topology, possibly splitting existing Edges/Faces. The optional argument tolerance if...
654	TopoGeo_AddLineStringNoFace	拓扑节点、边和面	语法：TopoGeo_AddLineStringNoFace( toponame Text , linestring Geometry ) : Integer ； TopoGeo_AddLineStringNoFace( toponame Text , linestring Geometry , tolerance Double precision ) : Text；官方摘要：RTTOPO；Very similar to TopoGeo_AddLinestring except for a very critical difference. This function is strongly optimized for maximum speed, and will just update Nodes and Edges p...
655	TopoGeo_TopoSnap	拓扑节点、边和面	语法：TopoGeo_TopoSnap( toponame Text , input Geometry , iterate Integer ) : Geometry ； TopoGeo_TopoSnap( toponame Text , input Geometry , tolerance_snap Double precision , tolerance_removal Double precision , iterate Integ...；官方摘要：RTTOPO；Will attempt to snap (i.e. renode) the input Geometry (any type) against the Topology identified by toponame . the arguments iterate is intended to be Boolean ( 0 = FALSE...
656	TopoGeo_SnappedGeoTable	拓扑节点、边和面	语法：TopoGeo_SnappedGeoTable( toponame Text , db-prefix Text , table-name Text , column-name Text , output-table Text , iterate Integer ) : Integer ； TopoGeo_SnappedGeoTable( toponame Text , db-prefix Text , table-name Tex...；官方摘要：RTTOPO；Will attempt to create and populate an output-table by snapping against the Topology identified by toponame all Geometries from an input GeoTable identified by db-prefix ...
657	TopoGeo_SubdivideLines	拓扑节点、边和面	语法：TopoGeo_SubdivideLines( input Geometry , line_max_points Integer ) : MultiLinestring ； TopoGeo_SubdivideLines( input Geometry , line_max_points Integer , line_max_length Double precision ) : MultiLinestring；官方摘要：RTTOPO；Will attempt to split a Linestring (or even a MultiLinestring ) into a collection of shorter LineStrings fully respecting Topology consistency. if argument line_max_point...
658	TopoGeo_FromGeoTable	拓扑节点、边和面	语法：TopoGeo_FromGeoTable( toponame Text , db-prefix Text , table-name Text , column-name Text ) : Integer ； TopoGeo_FromGeoTable( toponame Text , db-prefix Text , table-name Text , column-name Text , line_max_points Integ...；官方摘要：RTTOPO；Will attempt to import all Geometries from an input GeoTable identified by db-prefix , table-name and column-name into an existing Topology-Geometry created with CreateTo...
659	TopoGeo_FromGeoTableNoFace	拓扑节点、边和面	语法：TopoGeoFromGeoTableNoFace( toponame Text , db-prefix Text , table-name Text , column-name Text ) : Integer ； TopoGeo_FromGeoTableNoFace( toponame Text , db-prefix Text , table-name Text , column-name Text , line_max...；官方摘要：RTTOPO；Very similar to TopoGeo_FromGeoTable except for a very critical difference. This function is strongly optimized for maximum speed, and will only update/create Nodes and E...
660	TopoGeo_FromGeoTableExt	拓扑节点、边和面	语法：TopoGeo_FromGeoTableExt( toponame Text , db-prefix Text , table-name Text , column-name Text , dustbin-table Text , dustbin-view Text ) : Integer ； TopoGeo_FromGeoTableExt( toponame Text , db-prefix Text , table-name ...；官方摘要：RTTOPO；Will attempt to import all Geometries from an input GeoTable identified by db-prefix , table-name and column-name into an already existing Topology-Geometry, in the same ...
661	TopoGeo_FromGeoTableNoFaceExt	拓扑节点、边和面	语法：TopoGeo_FromGeoTableNoFaceExt( toponame Text , db-prefix Text , table-name Text , column-name Text , dustbin-table Text , dustbin-view Text ) : Integer ； TopoGeo_FromGeoTableNoFaceExt( toponame Text , db-prefix Text ,...；官方摘要：RTTOPO；Very similar to TopoGeo_FromGeoTableExt except for a very critical difference. This function is strongly optimized for maximum speed, and will only update/create Nodes an...
662	TopoGeo_Polygonize	拓扑节点、边和面	语法：TopoGeo_Polygonize( toponame Text )； TopoGeo_Polygonize( toponame Text , force_rebuild Boolean )；官方摘要：RTTOPO；Will remove all existing Faces from a Topology and then rebuild them from scratch. If the Topology already is in a fully consistent state (i.e. all Edges are found to be ...
663	TopoGeo_RemoveSmallFaces	拓扑节点、边和面	语法：TopoGeo_RemoveSmallFaces( toponame Text , min-circularity Double precision ) : Integer ； TopoGeo_RemoveSmallFaces( toponame Text , min-circularity Double precision , min-area Double precision ) : Integer；官方摘要：RTTOPO；Will remove from the given Topology all Faces presenting both a Circularity index smaller than min-circularity and an area smaller than min-area . for a formal definition...
664	TopoGeo_RemoveDanglingEdges	拓扑节点、边和面	语法：TopoGeo_RemoveDanglingEdges( toponame Text ) : Integer；官方摘要：RTTOPO；Will remove from the given Topology all dangling Edges.； Will return 1 on full success; an exception will be raised on failure.
665	TopoGeo_RemoveDanglingNodes	拓扑节点、边和面	语法：TopoGeo_RemoveDanglingNodes( toponame Text ) : Integer；官方摘要：RTTOPO；Will remove from the given Topology all dangling Nodes.； Will return 1 on full success; an exception will be raised on failure.
666	TopoGeo_NewEdgeHeal	拓扑节点、边和面	语法：TopoGeo_NewEdgeHeal( toponame Text ) : Integer；官方摘要：RTTOPO；Will remove from the given Topology all unnecessary Nodes.； An unnecessary Node is one connected to exactly two Edges whilst both Edges share the same two Faces; it's obv...
667	TopoGeo_ModEdgeHeal	拓扑节点、边和面	语法：TopoGeo_ModEdgeHeal( toponame Text ) : Integer；官方摘要：RTTOPO；Will remove from the given Topology all unnecessary Nodes.； An unnecessary Node is one connected to exactly two Edges whilst both Edges share the same two Faces; it's obv...
668	TopoGeo_NewEdgesSplit	拓扑节点、边和面	语法：TopoGeo_NewEdgesSplit( toponame Text , line_max_points Integer ) : Integer ； TopoGeo_NewEdgesSplit( toponame Text , line_max_points Integer , line_max_length Double precision ) : Integer；官方摘要：RTTOPO；Will attempt to split all Edges into a collection of shorter Edges fully respecting Topology consistency.； The interpretation of line_max_points and line_max_lenght argum...
669	TopoGeo_ModEdgeSplit	拓扑节点、边和面	语法：TopoGeo_ModEdgeSplit( toponame Text , line_max_points Integer ) : Integer ； TopoGeo_ModEdgeSplit( toponame Text , line_max_points Integer , line_max_length Double precision ) : Integer；官方摘要：RTTOPO；Will attempt to split all Edges into a collection of shorter Edges fully respecting Topology consistency.； The interpretation of line_max_points and line_max_lenght argum...
670	TopoGeo_Clone	拓扑节点、边和面	语法：TopoGeo_Clone( db-prefix Text , toponame Text , new-toponame Text ) : Integer；官方摘要：RTTOPO；Will clone an existing Topology into another; the destionation Topology shall not exist and will be automatically created. db-prefix may be NULL , and in this case the in...
671	TopoGeo_GetEdgeSeed	拓扑节点、边和面	语法：TopoGeo_GetEdgeSeed( toponame Text , edge-id Integer ) : Geometry；官方摘要：X；RTTOPO；Will return a Point Geometry uniquely identifying an Edge (i.e. spatially intersecting the Edge).； Will return a Point on success; an exception will be raised on failure.
672	TopoGeo_GetFaceSeed	拓扑节点、边和面	语法：TopoGeo_GetFaceSeed( toponame Text , face-id Integer ) : Geometry；官方摘要：X；RTTOPO；Will return a Point Geometry uniquely identifying a Face (i.e. spatially intersecting the Face).； Will return a Point on success; an exception will be raised on failure.
673	TopoGeo_SnapPointToSeed	拓扑节点、边和面	语法：TopoGeo_SnapPointToSeed( point Geometry , toponame Text , distance Double ) : Geometry；官方摘要：X；RTTOPO；Will possibly return a new Point precisely snapped to the nearset TopoNode within the given distance ; if no such TopoNode exists NULL will be returned.； An exception w...
674	TopoGeo_SnapLineToSeed	拓扑节点、边和面	语法：TopoGeo_SnapLineToSeed( line Geometry , toponame Text , distance Double ) : Geometry；官方摘要：X；RTTOPO；Will possibly return a new Linestring precisely snapped to the nearset Edge TopoSeed within the given distance ; if no such TopoSeed exists NULL will be returned.； An e...
675	TopoGeo_DisambiguateSegmentEdges	拓扑节点、边和面	语法：TopoGeo_DisambiguateSegmentEdges( toponame Text ) : Integer；官方摘要：X；RTTOPO；Ensures that all Edges on a Topology-Geometry will have not less than three vertices. all Edges found already definining three or more vertices will be left untouched a...
676	TopoGeo_UpdateSeeds	拓扑节点、边和面	语法：TopoGeo_UpdateSeeds( toponame Text ) : Integer ； TopoGeo_UpdateSeeds( toponame Text , incremental-mode Integer ) : Integer；官方摘要：X；RTTOPO；Will update all persistent Edge- and Face-Seeds so to correctly represent the current state of the underlying Topology. if the optional argument incremental-mode is set...
677	TopoGeo_PolyFacesList	拓扑节点、边和面	语法：TopoGeo_PolyFacesList( toponame Text , db-prefix Text , ref-table-name Text , ref-column-name Text , out-table Text ) : Integer；官方摘要：RTTOPO；Will attempt to export into an output Table all relationships between the Faces of some Topology-Geometry and Polygons/Multipolygons found within a given Reference-GeoTab...
678	TopoGeo_LineEdgesList	拓扑节点、边和面	语法：TopoGeo_LineEdgesList( toponame Text , db-prefix Text , ref-table-name Text , ref-column-name Text , out-table Text ) : Integer；官方摘要：RTTOPO；Will attempt to export into an output Table all relationships between the Edges of some Topology-Geometry and Linestrings/Multilinestrings found within a given Reference-...
679	TopoGeo_ToGeoTable	拓扑节点、边和面	语法：TopoGeo_ToGeoTable( toponame Text , db-prefix Text , ref-table-name Text , ref-column-name Text , out-table Text ) : Integer ； TopoGeo_ToGeoTable( toponame Text , db-prefix Text , ref-table-name Text , ref-column-name...；官方摘要：RTTOPO；Will attempt to export into an Output GeoTable all Geometries out from a Topology-Geometry matching (via Seed-based references) a given Reference-GeoTable containing info...
680	TopoGeo_ToGeoTableGeneralize	拓扑节点、边和面	语法：TopoGeo_ToGeoTableGeneralize( toponame Text , db-prefix Text , ref-table-name Text , ref-column-name Text , out-table Text , tolerance Double precision ) : Integer ； TopoGeo_ToGeoTableGeneralize( toponame Text , db-pr...；官方摘要：RTTOPO；Exactly the same as TopoGeo_ToGeoTable() except in that all exported geometries will be simplified / generalized still maintaining full topological consistency. tolerance...
681	TopoGeo_CreateTopoLayer	拓扑节点、边和面	语法：TopoGeo_CreateTopoLayer( toponame Text , db-prefix Text , ref-table-name Text , ref-column-name Text , topolayer-name Text ) : Integer ； TopoGeo_CreateTopoLayer( toponame Text , db-prefix Text , ref-table-name Text , ...；官方摘要：RTTOPO；Will create a fully defined new TopoLayer starting from a reference GeoTable: db-prefix can be NULL , and in this case the reference GeoTable is expected to be located wi...
682	TopoGeo_InitTopoLayer	拓扑节点、边和面	语法：TopoGeo_InitTopoLayer( toponame Text , db-prefix Text , ref-table-name Text , topolayer-name Text ) : Integer；官方摘要：RTTOPO；Will initialize a partialy defined new TopoLayer starting from a reference plain Table or View: db-prefix can be NULL , and in this case the reference Table or View is ex...
683	TopoGeo_RemoveTopoLayer	拓扑节点、边和面	语法：TopoGeo_RemoveTopoLayer( toponame Text , topolayer-name Text ) : Integer；官方摘要：RTTOPO；Will completely remove an existing TopoLayer .； Will return 1 on success; an exception will be raised on failure.
684	TopoGeo_ExportTopoLayer	拓扑节点、边和面	语法：TopoGeo_ExportTopoLayer( toponame Text , topolayer-name Text , out-table Text ) : Integer ； TopoGeo_ExportTopoLayer( toponame Text , topolayer-name Text , out-table Text , with-spatial-index Boolean ) : Integer ； Topo...；官方摘要：RTTOPO；Will create and populate a GeoTable corresponding to a TopoLayer . if the optional boolean argument with-spatial-index is set to TRUE (any other value different from zero...
685	TopoGeo_InsertFeatureFromTopoLayer	拓扑节点、边和面	语法：TopoGeo_InsertFeatureFrom( toponame Text , topolayer-name Text , out-table Text , fid Integer ) : Integer；官方摘要：RTTOPO；Will inserting a single TopoFeature identified by is fid into a GeoTable corresponding to a TopoLayer . the output GeoTable must exist and is expected to be created by a ...

9.49 SQL functions supporting Topology-Network

序号	函数名	函数功能	详细说明
686	GetLastNetworkException	网络节点、链接和连通性	语法：GetLastNetworkException( netname Text ) : Text；官方摘要：RTTOPO；Will return the most recent exception raised by this Topo-Net, or NULL if no exception is currently pending.
687	InitTopoNet	网络节点、链接和连通性	语法：ST_InitTopoNet( netname Text ) : Integer；官方摘要：X；RTTOPO；This SQL function is explicitly required by ISO 13249-3 , anyway it's simply implemented as an alias-name for CreateNetwork ( netname ) .； Will return 1 on success) or ...
688	CreateNetwork	网络节点、链接和连通性	语法：CreateNetwork( netname Text ) : Integer ； CreateNetwork( netname Text , spatial Boolean ) : Integer ； CreateNetwork( netname Text , spatial Boolean , srid Integer ) : Integer ； CreateNetwork( netname Text , spatial Bo...；官方摘要：RTTOPO；Will create all DBMS objects (tables, triggers, indices and alike) required in order to store a separate Topo-Net. netname : the individual unique name of this Topo-Net: ...
689	DropNetwork	网络节点、链接和连通性	语法：DropNetwork( netname Text ) : Integer；官方摘要：RTTOPO；Completely removes a Topo-Net (and all data it contains) from the DBMS: to be invoked very cautiously and only if you are absolutely sure of what you are doing.； Will ret...
690	AddIsoNetNode	网络节点、链接和连通性	语法：ST_AddIsoNetNode( netname Text , point Geometry ) : Integer；官方摘要：X；RTTOPO；Will add a new isolated NetNode.； Will return the ID of the inserted NetNode on success; an exception will be raised on failure.
691	MoveIsoNetNode	网络节点、链接和连通性	语法：ST_MoveIsoNetNode( netname Text , node-id Integer , point Geometry ) : Text；官方摘要：X；RTTOPO；Will move an isolated NetNode from a point to another.； Will return a text message on success; an exception will be raised on failure.
692	RemIsoNetNode	网络节点、链接和连通性	语法：ST_RemIsoNetNode( netname Text , node-id Integer ) : Text；官方摘要：X；RTTOPO；Will remove an isolated NetNode.； Will return a text message on success; an exception will be raised on failure.
693	AddLink	网络节点、链接和连通性	语法：ST_AddLink( netname Text , startnode-id Integer , endnode-id Integer , linestring Geometry ) : Integer；官方摘要：X；RTTOPO；Will add a new Link connecting two NetNodes.； Will return the ID of the inserted Link on success; an exception will be raised on failure.
694	ChangeLinkGeom	网络节点、链接和连通性	语法：ST_ChangeLinkGeom( netname Text , link-id Integer , linestring Geometry ) : Text；官方摘要：X；RTTOPO；Will change the geometry of a Link without affecting Topology relationships.； Will return a text message on success; an exception will be raised on failure.
695	RemoveLink	网络节点、链接和连通性	语法：ST_RemoveLink( netname Text , link-id Integer ) : Text；官方摘要：X；RTTOPO；Will remove a Link.； Will return a text message on success; an exception will be raised on failure.
696	NewLogLinkSplit	网络节点、链接和连通性	语法：ST_NewLogLinkSplit( netname Text , link-id Integer ) : Integer；官方摘要：X；RTTOPO；Will split a Link (of the Logical type) by creating a new intermediate NetNode. The original Link will be deleted and will be replaced by two new Links.； Will return th...
697	ModLogLinkSplit	网络节点、链接和连通性	语法：ST_ModLogLingSplit( netname Text , link-id Integer ) : Integer；官方摘要：X；RTTOPO；Will split a Link (of the Logical type) by creating a new intermediate NetNode. The original Link will be modified and a new Link will be inserted.； Will return the ID ...
698	NewGeoLinkSplit	网络节点、链接和连通性	语法：ST_NewGeoLinkSplit( netame Text , link-id Integer , point Geometry ) : Integer；官方摘要：X；RTTOPO；Will split a Link (of the Spatial type) by creating a new intermediate NetNode. The original Link will be deleted and will be replaced by two new Links.； Will return th...
699	ModGeoLinkSplit	网络节点、链接和连通性	语法：ST_ModGeoLingSplit( netame Text , link-id Integer , point Geometry ) : Integer；官方摘要：X；RTTOPO；Will split a Link (of the Spatial type) by creating a new intermediate NetNode. The original Link will be modified and a new Link will be inserted.； Will return the ID ...
700	NewLinkHeal	网络节点、链接和连通性	语法：ST_NewLinkHeal( netname Text , link1-id Integer , link2-id Integer ) : Integer；官方摘要：X；RTTOPO；Will heal two Links by deleting the NetNode connecting them. Both the original Links will be deleted and will be replaced by a new Link preserving the same orientation ...
701	ModLinkHeal	网络节点、链接和连通性	语法：ST_ModLinkHeal( netname Text , link1-id Integer , link2-id Integer ) : Integer；官方摘要：X；RTTOPO；Will heal two Links by deleting the NetNode connecting them. The first Link provided will be modified and the second deleted.； Will return the ID of the removed NetNode...
702	LogiNetFromTGeo	网络节点、链接和连通性	语法：ST_LogiNetFromTGeo( netname Text , toponame Text ) : Integer；官方摘要：X；RTTOPO；Will create a Logical Topology-Network from an existing Topology-Geometry .； The destination TopoNet is expected to exist and to be completely empty.； Will return 1 on ...
703	SpatNetFromTGeo	网络节点、链接和连通性	语法：ST_SpatNetFromTGeo( netname Text , toponame Text ) : Integer；官方摘要：X；RTTOPO；Will create a Spatial Topology-Network from an existing Topology-Geometry .； The destination TopoNet is expected to exist and to be completely empty.； Will return 1 on ...
704	SpatNetFromGeom	网络节点、链接和连通性	语法：ST_SpatNetFromGeom( netname Text , geometry BLOB )；官方摘要：X；RTTOPO；Will populate a full Network by importing a collection of arbitrary Geometries.； The destination Network must already exists and must be empty; both SRID and dimensions...
705	ValidLogicalNet	网络节点、链接和连通性	语法：ST_ValidLogicalNet( netname Text ) : DB-table；官方摘要：X；RTTOPO；Will create a DB-Table containing a validation report for the given TopoNet of the Logical type: if the output table is empty and no exception was raised the Network is...
706	ValidSpatialNet	网络节点、链接和连通性	语法：ST_ValidSpatialNet( netname Text ) : DB-table；官方摘要：X；RTTOPO；Will create a DB-Table containing a validation report for the given TopoNet of the Spatial type: if the output table is empty and no exception was raised the Network is...
707	GetNetNodeByPoint	网络节点、链接和连通性	语法：GetNetNodeByPoint( netname Text , point Geometry ) : Integer ； GetNetNodeByPoint( netname Text , point Geometry , tolerance Double precision ) : Integer；官方摘要：RTTOPO；Will attempt to find the ID of a NetNode located at Point. The optional argument tolerance if omitted will imply an exact coincidence ( 0.0 by default). ； Will return the...
708	GetLinkByPoint	网络节点、链接和连通性	语法：GetLinkByPoint( netname Text , point Geometry ) : Integer ； GetLinkByPoint( netname Text , point Geometry , tolerance Double precision ) : Integer；官方摘要：RTTOPO；Will attempt to find the ID of a Link intersecting the given Point. The optional argument tolerance if omitted will imply an exact coincidence ( 0.0 by default). ； Will r...
709	TopoNet_FromGeoTable	网络节点、链接和连通性	语法：TopoNet_FromGeoTable( toponame Text , db-prefix Text , table-name Text , column-name Text ) : Integer；官方摘要：RTTOPO；Will attempt to import all Geometries from an input GeoTable identified by db-prefix , table-name and column-name into an already existing Topology-Network. db-prefix can...
710	TopoNet_Clone	网络节点、链接和连通性	语法：TopoNet_Clone( netname Text , new-netname Text ) : Integer；官方摘要：RTTOPO；Will clone an existing Network into another; the destionation Network shall not exist and will be automatically created.； Will return 1 on success; an exception will be r...
711	TopoNet_GetLinkSeed	网络节点、链接和连通性	语法：TopoNet_GetLinkSeed( netname Text , link-id Integer ) : Geometry；官方摘要：RTTOPO；Will return a Point Geometry uniquely identifying a Link (i.e. spatially intersecting the Link).； Will return a Point on success; an exception will be raised on failure.
712	TopoNet_DisambiguateSegmentLinks	网络节点、链接和连通性	语法：TopoNet_DisambiguateSegmentLinks( toponame Text ) : Integer；官方摘要：X；RTTOPO；Ensures that all Links on a Topology-Network will have not less than three vertices. all Links found already definining three or more vertices will be left untouched as...
713	TopoNet_UpdateSeeds	网络节点、链接和连通性	语法：TopoNet_UpdateSeeds( netname Text ) : Integer ； TopoNet_UpdateSeeds( netname Text , incremental-mode Integer ) : Integer；官方摘要：RTTOPOM；Will update all persistent Link-Seeds so to correctly represent the current state of the underlying Network. if the optional argument incremental-mode is set to TRUE an ...
714	TopoNet_LineLinksList	网络节点、链接和连通性	语法：TopoNet_LineLinksList( netname Text , db-prefix Text , ref-table-name Text , ref-column-name Text , out-table Text ) : Integer；官方摘要：RTTOPO；Will attempt to export into an output Table all relationships between the Links of some Topology-Network and Linestrings/Multilinestrings found within a given Reference-G...
715	TopoNet_ToGeoTable	网络节点、链接和连通性	语法：TopoNet_ToGeoTable( toponame Text , db-prefix Text , ref-table-name Text , ref-column-name Text , out-table Text ) : Integer ； TopoNet_ToGeoTable( toponame Text , db-prefix Text , ref-table-name Text , ref-column-name...；官方摘要：RTTOPO；Will attempt to export into an Output GeoTable all Geometries out from a Topology-Network matching (via Seed-based references) a given Reference-GeoTable containing infor...
716	TopoNet_ToGeoTableGeneralize	网络节点、链接和连通性	语法：TopoNet_ToGeoTableGeneralize( toponame Text , db-prefix Text , ref-table-name Text , ref-column-name Text , out-table Text , tolerance Double precision ) : Integer ； TopoNet_ToGeoTableGeneralize( toponame Text , db-pr...；官方摘要：RTTOPO；Exactly the same as TopoNet_ToGeoTable() except in that all exported geometries will be simplified / generalized still maintaining full topological consistency. tolerance...

9.50 SQL functions supporting WMS datasources

序号	函数名	函数功能	详细说明
717	WMS_CreateTables	WMS 数据源和请求配置	语法：WMS_CreateTables() : Integer；官方摘要：Creates all DB Tables required for permanently egistering WMS datasources and their configurations.； Will return 1 on success; 0 on failure.
718	WMS_RegisterGetCapabilities	WMS 数据源和请求配置	语法：WMS_RegisterGetCapabilities( url Text ) : Integer ； WMS_RegisterGetCapabilities( url Text , title Text , abstract Text ) : Integer；官方摘要：Registers a WMS server.； Will return 1 on success; 0 on failure; -1 on invalid arguments.
719	WMS_UnRegisterGetCapabilities	WMS 数据源和请求配置	语法：WMS_UnRegisterGetCapabilities( url Text ) : Integer；官方摘要：Unregisters a WMS server (and all related children).； Will return 1 on success; 0 on failure; -1 on invalid arguments.
720	WMS_SetGetCapabilitiesInfos	WMS 数据源和请求配置	语法：WMS_SetGetCapabilitiesInfos( url Text , title Text , abstract Text )；官方摘要：Sets or updates the Title and Abstract for the WMS server identified by url .； Will return 1 on success; 0 on failure; -1 on invalid arguments.
721	WMS_RegisterGetMap	WMS 数据源和请求配置	语法：WMS_RegisterGetMap( getcapabilitites_url Text , getmap_url Text , layer_name Text , version Text , ref_sys Text , image_format Text , style Text , is_transparent Boolean , flip_axes Boolean ) : Integer ； WMS_RegisterG...；官方摘要：Registers a WMS layer. getcapabilities_url : URL referencing the parent WMS GetCapabilities request (must be already registered). getmap_url : base URL corresponding to the WMS ...
722	WMS_UnRegisterGetMap	WMS 数据源和请求配置	语法：WMS_UnRegisterGetMap( getmap_url Text , layer_name Text ) : Integer；官方摘要：Unregisters a WMS Layer (and all related children).； Will return 1 on success; 0 on failure; -1 on invalid arguments.
723	WMS_SetGetMapInfos	WMS 数据源和请求配置	语法：WMS_SetGetMapInfos( getmap_url Text , layer_name Text , title Text , abstract Text ) : Integer；官方摘要：Sets or updates the Title and Abstract for the WMS Layer identified by getmap_url and layer_name .； Will return 1 on success; 0 on failure; -1 on invalid arguments.
724	WMS_SetGetMapCopyright	WMS 数据源和请求配置	语法：WMS_SetGetMapCopyright( getmap_url Text , layer_name String , copyright String ) : Integer ； WMS_SetGetMapCopyright( getmap_url Text , layer_name String , copyright String , license String ): Integer；官方摘要：Updates Copyright and License infos associated to a WMS Layer . getmap_url and layer_name must identify an existing WMS Layer. copyright identifies the Copyright holder; if NULL...
725	WMS_SetGetMapOptions	WMS 数据源和请求配置	语法：WMS_SetGetMapOptions( getmap_url Text , layer_name Text , transparent Boolean , flip_axes Boolean )； WMS_SetGetMapOptions( getmap_url Text , layer_name Text , is_tiled Boolean , cached Boolean , tile_width Integer , t...；官方摘要：Sets or updates configurable options for the WMS Layer identified by getmap_url and layer_name .； Please check WMS_RegisterGetMap for more informations about supported options.；...
726	WMS_RegisterSetting	WMS 数据源和请求配置	语法：WMS_RegisterSetting( getmap_url Text , layer_name Text , key Text , value Text ) : Integer ； WMS_RegisterSetting( getmap_url Text , layer_name Text , key Text , value Text , is_default Boolean ) : Integer；官方摘要：Registers an alternative setting for the WMS Layer identified by getmap_url and layer_name . key : identifies a specific multi-value setting, and should be either version or for...
727	WMS_RegisterStyle	WMS 数据源和请求配置	语法：WMS_RegisterStyle( getmap_url Text , layer_name Text , style_name Text , style_title Text , style_abstract Text ) : Integer ； WMS_RegisterStyle( getmap_url Text , layer_name Text , style_name Text , style_title Text ,...；官方摘要：Registers an alternative style available for the WMS Layer identified by getmap_url and layer_name . style_name : Name of the supported Style. style_title : Title of the support...
728	WMS_UnRegisterSetting	WMS 数据源和请求配置	语法：WMS_UnRegisterSetting( getmap_url Text , layer_name Text , key Text , value Text ) : Integer；官方摘要：Unregisters an alternative setting from the corresponding WMS Layer.； Will return 1 on success; 0 on failure; -1 on invalid arguments.
729	WMS_DefaultSetting	WMS 数据源和请求配置	语法：WMS_DefaultSetting( getmap_url Text , layer_name Text , key Text , value Text ) : Integer；官方摘要：Makes an alternative setting to become the standard setting for the corresponding WMS Layer.； Will return 1 on success; 0 on failure; -1 on invalid arguments.
730	WMS_RegisterRefSys	WMS 数据源和请求配置	语法：WMS_RegisterRefSys( getmap_url Text , layer_name Text , ref_sys Text , minx Double , miny Double , maxx Double , maxy Double ) : Integer ； WMS_RegisterRefSys( getmap_url Text , layer_name Text , ref_sys Text , minx Do...；官方摘要：Registers an alternative Reference System for the WMS Layer identified by getmap_url and layer_name ref_sys : name of Reference System (e.g. 'EPSG:4326' or 'EPSG:32632' ). minx ...
731	WMS_UnRegisterRefSys	WMS 数据源和请求配置	语法：WMS_UnRegisterRefSys( getmap_url Text , layer_name Text , ref_sys Text ) : Integer；官方摘要：Unregisters an alternative Reference System from the corresponding WMS Layer.； Will return 1 on success; 0 on failure; -1 on invalid arguments.
732	WMS_DefaultRefSys	WMS 数据源和请求配置	语法：WMS_DefaultRefSys( getmap_url Text , layer_name Text , ref_sys Text ) : Integer；官方摘要：Makes an alternative SRS to become the standard Reference System for the corresponding WMS Layer.； Will return 1 on success; 0 on failure; -1 on invalid arguments.
733	WMS_GetMapRequestURL	WMS 数据源和请求配置	语法：WMS_GetMapRequestURL( getmap_url Text , layer_name Text , width Integer , height Integer , minx Double , miny Double , maxx Double , maxy Double ) : Text；官方摘要：Creates a WMS GetMap request URL for the WMS Layer identified by getmap_url and layer_name by applying the currently set options. width and height : horizontal and vertical dime...
734	WMS_GetFeatureInfoRequestURL	WMS 数据源和请求配置	语法：WMS_GetFeatureInfoRequestURL( getmap_url Text , layer_name Text , width Integer , height Integer , x Integer , y Integer , minx Double , miny Double , maxx Double , maxy Double ) : Text ； WMS_GetFeatureInfoRequestURL(...；官方摘要：Creates a WMS GetFeatureInfo request URL for the WMS Layer identified by getmap_url and layer_name by applying the currently set options. width and height : horizontal and verti...

9.51 SQL functions supporting Data Licenses

序号	函数名	函数功能	详细说明
735	RegisterDataLicense	数据许可证	语法：RegisterDataLicense( license_name Text ) : Integer ； RegisterDataLicense( license_name Text , url Text ) : Integer；官方摘要：Registers a Data License. license_name is expected to be a text string uniquely identifying a license/version.； Note : the following licenses are always self-defined when creati...
736	UnRegisterDataLicense	数据许可证	语法：UnRegisterDataLicense( license_name Text ) : Integer；官方摘要：Unregisters a Data License. license_name is expected to match an already registered license/version. ； Will return 1 on success; 0 on failure; -1 on invalid argument.
737	RenameDataLicense	数据许可证	语法：RenameDataLicense( old_name Text , new_name Text ) : Integer；官方摘要：Renames a Data License. old_name is expected to match an already registered license/version. new_name must not match any already registered license/version so to respect the uni...
738	SetDataLicenseUrl	数据许可证	语法：SetDataLicenseURL( license_name Text , url Text ) : Integer；官方摘要：Sets or updates the URL corresponding to a Data License. license_name is expected to match an already registered license/version. url is expected to be an URL pointing to the li...

9.52 miscellaneous advanced SQL functions

序号	函数名	函数功能	详细说明
739	CloneTable	导入导出和数据库工具	语法：CloneTable( db-prefix Text , input_table Text , output_table Text , transaction Integer ) : Integer ； CloneTable( db-prefix Text , input_table Text , output_table Text , transaction Integer , option_1 Text [ , ... , o...；官方摘要：Will clone (i.e. create+copy) an origin table into a destination table: the origin could be eventually located into some attached DB, but the destination is always assumed to be...
740	CreateClonedTable	导入导出和数据库工具	语法：CreateClonedTable( db-prefix Text , input_table Text , output_table Text , transaction Integer ) : Integer ； CreateClonedTable( db-prefix Text , input_table Text , output_table Text , transaction Integer , option_1 Te...；官方摘要：A strict derivative of CloneTable() accepting the same arguments with identical meaning.； The only difference is in that this second variant will only create the output Table de...
741	CheckDuplicateRows	导入导出和数据库工具	语法：CheckDuplicateRows( table Text ) : Integer；官方摘要：Will check if the given table does contain duplicate rows, i.e. rows presenting identical values for all columns (ignoring any Primary Key column). ； Will return the total numbe...
742	RemoveDuplicateRows	导入导出和数据库工具	语法：RemoveDuplicateRows( table Text ) : Integer ； RemoveDuplicateRows( table Text , transaction Boolean ) : Integer；官方摘要：Will remove all duplicate rows from the given table preserving only a single occurrence.； The optional argument transaction determines if an internal SQL Transaction should be a...
743	ElementaryGeometries	导入导出和数据库工具	语法：ElementaryGeometries( in_table Text , geom_column Text , out_table Text , out_pk Text , out_multi_id Text ) : Integer ； ElementaryGeometries( in_table Text , geom_column Text , out_table Text , out_pk Text , out_multi...；官方摘要：Will create a new out_table directly corresponding to in_table . The output table will be arranged in such a way that each row will always contain an elementary Geometry; so eac...
744	DropGeoTable / ；； Deprecated !!! / Please, use DropTable()	导入导出和数据库工具	语法：DropGeoTable( table Text ) : Integer ； DropGeoTable( table Text , transaction Boolean ) : Integer ； DropGeoTable( db-prefix Text , table Text ) : Integer ； DropGeoTable( db-prefix Text , table Text , transaction Boole...；官方摘要：Will completely remove a Geometry Table (or Spatial View) this including any eventual SpatialIndex, metadata and statistics definitions an alike.； The optional argument transact...
745	DropTable	导入导出和数据库工具	语法：DropTable( db-prefix Text , table Text ) : Integer ； DropTable( db-prefix Text , table Text , permissive Boolean ) : Integer；官方摘要：Will safely remove a Geometry Table (or Spatial View), including any SpatialIndex, triggers, metadata, statistics tables.； Will also work on ordinary (non-Spatial) Tables and Vi...
746	RenameTable	导入导出和数据库工具	语法：RenameTable( db-prefix Text , old_name Text , new_name Text ) : Integer ； RenameTable( db-prefix Text , old_name Text , new_name Text , permissive Boolean ) : Integer；官方摘要：Will safely rename a Geometry Table, including any SpatialIndex, triggers, metadata, statistics tables.； Will also work on ordinary (non-Spatial) Tables, RasterLite2 raster_cove...
747	RenameColumn	导入导出和数据库工具	语法：RenameColumn( db-prefix Text , table Text , old_colname Text , new_colname Text ) : Integer ； RenameColumn( db-prefix Text , table Text , old_colname Text , new_colname Text , permissive Boolean ) : Integer；官方摘要：Will safely rename a Column belonging to a Geometry Table, including any SpatialIndex, triggers, metadata, statistics tables.； Will also work on Columns of ordinary (non-Spatial...
748	ImportSHP	导入导出和数据库工具	语法：ImportSHP( filename Text , table Text , charset Text ) : Integer ； ImportSHP( filename Text , table Text , charset Text [ , srid Integer [ , geom_column Text [ , pk_column Text [ , geometry_type Text [ , coerce2D Inte...；官方摘要：Will import an external Shapfile into an internal Table: Mandatory arguments: filename absolute or relative path leading to the Shapefile (omitting any .shp , .shx or .dbf suffi...
749	ImportZipSHP	导入导出和数据库工具	语法：ImportZipSHP( zip_path Text , basename Text , table Text , charset Text ) : Integer ； ImportZipSHP( zip_path Text , basename Text , table Text , charset Text [ , srid Integer [ , geom_column Text [ , pk_column Text [ ...；官方摘要：Will import an external Shapfile from a Zipfile into an internal Table. This function is almost the same as ImportSHP() , except in that the Shapefile is expected to be stored w...
750	Zipfile_NumSHP	导入导出和数据库工具	语法：Zipfile_NumSHP( zip_path Text ) : Integer；官方摘要：return the number of Shapefiles contained within the Zipfile identified by zip_path ； NULL on invalid argument or if the Zipfile does not exist or is corrupted.
751	Zipfile_ShpN	导入导出和数据库工具	语法：Zipfile_ShpN( zip_path Text , idx Integer ) : Text；官方摘要：return the basename of the nth (1-based) Shapefile contained within the Zipfile identified by zip_path ； NULL on invalid arguments or if the Zipfile does not exist or is corrupted.
752	ExportSHP	导入导出和数据库工具	语法：ExportSHP( table Text , geom_column Text , filename Text , charset Text ) : Integer ； ExportSHP( table Text , geom_column Text , filename Text , charset Text , geom_type Text \[ , colname_case Text ] ) : Integer；官方摘要：Will export an internal Table as an external Shapefile: table name of the table to be exported. geom_column name of the Geometry column. filename absolute or relative path leadi...
753	ImportDBF	导入导出和数据库工具	语法：ImportDBF( filename Text , table Text , charset Text ) : Integer ； ImportDBF( filename Text , table Text , charset Text , pk_column Text \[ , text_dates Integer \[ , colname_case Text ] ] ) : Integer；官方摘要：Will import an external DBF file into an internal Table: Mandatory arguments: filename absolute or relative path leading to the DBF (including the .dbf suffix). table name of th...
754	ImportZipDBF	导入导出和数据库工具	语法：ImportZipDBF( zip_path Text , filename Text , table Text , charset Text ) : Integer ； ImportZipDBF( zip_path Text , filename Text , table Text , charset Text [ , pk_column Text [ , text_dates Integer [ , colname_case ...；官方摘要：Will import an external DBF file from a Zipfile into an internal Table. This function is almost the same as ImportDBF() , except in that the DBF file is expected to be stored wi...
755	Zipfile_NumDBF	导入导出和数据库工具	语法：Zipfile_NumDBF( zip_path Text ) : Integer；官方摘要：return the number of DBF files contained within the Zipfile identified by zip_path ； NULL on invalid argument or if the Zipfile does not exist or is corrupted.
756	Zipfile_DbfN	导入导出和数据库工具	语法：Zipfile_DbfN( zip_path Text , idx Integer ) : Text；官方摘要：return the filename of the nth (1-based) DBF file contained within the Zipfile identified by zip_path ； NULL on invalid arguments or if the Zipfile does not exist or is corrupted.
757	ExportDBF	导入导出和数据库工具	语法：ExportDBF( table Text , filename Text , charset Text , colname_case Text ) : Integer；官方摘要：Will export an internal Table as an external DBF file: table name of the table to be exported. filename absolute or relative path leading to the DBF (including the .dbf suffix)...
758	ExportKML	导入导出和数据库工具	语法：ExportKML( table Text , geo_column Text , filename Text ) : Integer ； ExportKML( table Text , geo_column Text , filename Text , precision Integer \[ , name_column Text \[ , description Text ] ] ) : Integer；官方摘要：Will export an internal Table as an external KML file: Mandatory aguments: table name of the table to be exported. geom_column name of the Geometry column. filename absolute or ...
759	ExportGeoJSON / ；； Obsolete and deprecated !!! / Please, use ExportGeoJSON2()	导入导出和数据库工具	语法：ExportGeoJSON( table Text , geo_column Text , filename Text ) : Integer ； ExportGeoJSON( table Text , geo_column Text , filename Text , format Text \[ , precision Integer ] ) : Integer；官方摘要：Will export an internal Table as an external GeoJSON file: Mandatory aguments: table name of the table to be exported. geom_column name of the Geometry column. filename absolute...
760	ExportGeoJSON2	导入导出和数据库工具	语法：ExportGeoJSON2( table Text , geo_column Text , filename Text ) : Integer ； ExportGeoJSON2( table Text , geo_column Text , filename Text [ , precision Integer [ , lon_lat Boolen [ , M_coords Boolean [ , indented Boolea...；官方摘要：Will export an internal Table as an external GeoJSON file that is conformant to the RFC 7946 specifications: Mandatory aguments: table name of the table to be exported. geom_col...
761	ImportGeoJSON	导入导出和数据库工具	语法：ImportGeoJSON( filename Text , table Text ) : Integer ； ImportGeoJSON( filename Text , table Text , geo_column Text \[ , spatial_index Boolean \[ , srid Interger \[ , colname_case Text ]]] ) : Integer；官方摘要：Will create a Spatial Table by importing an external GeoJSON file conformant to the RFC 7946 specifications: Mandatory aguments: table name of the table to be created. filename ...
762	ImportXLS	导入导出和数据库工具	语法：ImportXLS( filename Text , table Text ) : Integer ； ImportXLS( filename Text , table Text , worksheet_index Integer \[ , first_line_titles Integer ] ) : Integer；官方摘要：Will import an external spreadsheet file ( Microsoft Excel .xls or .xlsx formats or Libre/OpenOffice Calc .ods format ) into an internal Table: Mandatory arguments: filename abs...
763	ImportWFS	导入导出和数据库工具	语法：ImportWFS( filename_or_url Text , layer_name Text , table Text ) : Integer ； ImportWFS( filename_or_url Text , layer_name Text , table Text [ , pk_column Text [ , swap_axes Integer [ , page_size Integer [ , spatial_in...；官方摘要：Will import data from a WFS datasource: Mandatory arguments: filename_or_url absolute or relative path leading to the WFS file.； Alternatively an URL corresponding to a WFS serv...
764	ImportDXF	导入导出和数据库工具	语法：ImportDXF( filename String ) : Integer ； ImportDXF( filename String , srid Integer , append Integer , dimensions Text , mode Text , special_rings Text , table_prefix Text , layer_name Text ) : Integer；官方摘要：Will import an external DXF file. filename absolute or relative path leading to the DXF file. srid EPSG SRID value; -1 by default. append boolean flag: enabling or not append mo...
765	ImportDXFfromDir	导入导出和数据库工具	语法：ImportDXFfromDir( dir_path String ) : Integer ； ImportDXFfromDir( dir_path String , srid Integer , append Integer , dimensions Text , mode Text , special_rings Text , table_prefix Text , layer_name Text ) : Integer；官方摘要：Will import all DXF files found within a given Directory. dir_path absolute or relative path leading to a directory containing all the *.dxf files to be imported. srid EPSG SRID...
766	ExportDXF	导入导出和数据库工具	语法：ExportDXF( outdir String , filename String , sql_query String , layer_col_name String , geom_col_name String , label_col_name String , text_height_col_name String , text_rotation_col_name String , geom_filter Geometr...；官方摘要：Will export a whole DXF file. The output file path is controlled by out_dir and filename . sql_query is a complete SQL Statement returning the dataset to be exported. layer_col...
767	ST_Cutter	导入导出和数据库工具	语法：ST_Cutter( input-db-prefix String , input-table String , input-geometry String , blade-db-prefix String , blade-table String , blade-geom String , output-table String [ , transaction Boolean [ , ram-temp-storage Boole...；官方摘要：Will precisely cut in a topological consistent way a whole Input dataset using a Blade dataset (i.e. an arbitrary polygonal dataset).； All cut fragments will be stored into a fu...
768	GetCutterMessage	导入导出和数据库工具	语法：GetCutterMessage( void ) : String；官方摘要：Will return the most recent diagnostic message emitted by ST_Cutter() .； NULL will be returned if no such message currently exists.
769	GetVirtualTableExtent	导入导出和数据库工具	语法：GetVirtualTableExtent( virtual_table_name String ) : Geometry；官方摘要：virtual_table_name is expected to identify some Table of the VirtualShape or VirtualGeoJSON type.； An Envelope Geometry will be returned corresponding to the Full Extent ; NULL ...
770	CreateRouting	导入导出和数据库工具	语法：CreateRouting( routingdata_table String , virtual_routing_table String , input_table String , from_column String , to_column String , geom_column String , cost_column String ) : Boolean ； CreateRouting( routing_data...；官方摘要：Will attempt to create a VirtualRouting Table (and the corresponding Routing Binary Data Table ) starting from a topologically correct Road Network .； routing_data_table : name ...
771	CreateRoutingNodes	导入导出和数据库工具	语法：CreateRoutingNodes( db_prefix String , spatial_table String , geom_column String , node_from String , node_to String ) : Boolean；官方摘要：Will attempt to add both node_from and nodes_to columns to the Spatial Table identified by db_prefix , spatial_table and geom_column . These two columns will be populated by ins...
772	CreateRouting_GetLastError	导入导出和数据库工具	语法：CreateRouting_GetLastError( void ) : String；官方摘要：Will return the most recent error message emitted by CreateRouting() or CreateRoutingNodes() .； NULL will be returned if no such error message currently exists.
773	IsLowASCII	导入导出和数据库工具	语法：IsLowASCII( text_string String ) : Integer；官方摘要：Inspects an UTF-8 encoded text_string testing if it only contains ASCII 7-bit characters.； The return type is Integer, with a return value of 1 for TRUE, 0 for FALSE, and -1 for...
774	GetDbObjectScope	导入导出和数据库工具	语法：GetDbObjectScope( db_prefix String , db_object_name String ) : String；官方摘要：Will return a text string explaining the intended scope of any DB object ( Table , View , Index or Trigger ), distinguishing between system ( internal/private objects required b...
775	Pause	导入导出和数据库工具	语法：Pause( void ) : NULL；官方摘要：Will suspend the execution of the current process. (mainly intended for debugging purposes).； Note : Pause() will effectively work only if EnablePause() has been explicitly call...
776	IsPauseEnabled	导入导出和数据库工具	语法：IsPauseEnabled( void ) : Boolean；官方摘要：Will test if Pause() is currently enabled ( TRUE ) or not ( FALSE ).
777	EnablePause	导入导出和数据库工具	语法：EnablePause( void ) : NULL；官方摘要：Will enable all subsequent calls to Pause() to be effective.； Note : by default Pause() is always kept disabled for each connection, so you necessarily have to call EnablePause(...
778	DisablePause	导入导出和数据库工具	语法：DisablePause( void ) : NULL；官方摘要：Will make all subsequent calls to Pause() to be effectless no-ops .

9.53 SQL Procedures, Stored Procedures and Stored Variables related SQL functions

序号	函数名	函数功能	详细说明
779	SqlProc_GetLastError	SQL Procedure、Stored Procedure 和 Stored Variable	语法：SqlProc_GetLastError( void ) : String；官方摘要：Will return the most recent error message returned by SQL Procedures and friends (if any).； NULL will be returned if there is no pending SQL Procedures error.
780	SqlProc_SetLogfile	SQL Procedure、Stored Procedure 和 Stored Variable	语法：SqlProc_SetLogfile( filepath String ) : Integer ； SqlProc_SetLogfile( filepath String , append Boolean ) : Integer；官方摘要：Will activate a SQL Logfile supporting all following calls to SqlProc_Execute() , SqlProc_ExecuteLoop() , StoredProc_Execute() and StoredProc_ExecuteLoop() . The filepath argume...
781	SqlProc_GetLogfile	SQL Procedure、Stored Procedure 和 Stored Variable	语法：SqlProc_GetLogf