1、背景
前端返回一个实体类，实体类里还有集合。要对集合外的属性查询，还要对集合批量查询，并且属性可能为空。返回给前端的结果是个实体类，实体类里有集合。
2、前端实体类
java
public class AppletSyncDiseaseInfoBO {
// 病害信息同步接口
/**
* 组织id
*/
private Integer organizationId;
/**
* 最后一次同步时间，病害更新时间小于此时间的不同步，可为空
*/
private String lastSyncTime;
/**
* 返回结果中的坐标系WGS84等，待约定
*/
private String coordinate;
/**
* 路面类型:沥青A,水泥D
*/
private char roadSurface;
/**
* 病害集合
*/
private List<AppletDiseaseInfoBO> disease;
}
java
public class AppletDiseaseInfoBO {
/**
* 病害类型
*/
private String proType;
/**
* 筛选上限，为空则不做筛选
*/
private Double upperLimit;
/**
* 筛选下限，为空则不做筛选
*/
private Double lowerLimit;
}3、返回给前端的实体类
java
public class AppletDiseaseInfoVO {
/**
* 组织id
*/
private Integer organizationId;
/**
* 接口调用结果返回时间
*/
private String nowTime;
/**
* 返回结果中的坐标系WGS84等，待约定
*/
private String coordinate;
List<AppletDiseaseVO> problem;
}
java
public class AppletDiseaseVO extends AppletDiseaseBO {
/**
* 病害id
*/
private Integer proId;
/**
* 识别任务id
*/
private Integer subId;
/**
* 图片id
*/
private Integer picId;
/**
* 病害类型
*/
private String proType;
/**
* 病害名称
*/
private String proName;
/**
* 经度
*/
private Double lon;
/**
* 纬度
*/
private Double lat;
/**
* 道路id
*/
private Integer roadId;
/**
* 道路区间id
*/
private Integer roadIntervalId;
/**
* 道路方向，上行U；下行D
*/
private char roadDirection;
/**
* 桩号
*/
private Integer chainage;
/**
* 桩号偏移量
*/
private Double chainageOffset;
/**
* 影响面积或长度
*/
private Double proDestroy;
/**
* 原始图片地址
*/
private String picUrl;
/**
* 病害发现时间
*/
private String findTime;
}4、sql语句
sql
<resultMap id="syncDiseaseInfoMap" type="com.jzsk.presentation.pojo.vo.AppletSyncDiseaseInfoVO">
<result column="organization_id" property="organizationId"/>
-- 以下就是映射到集合里
<collection property="problem" javaType="java.util.List" resultMap="problemsMap"/>
</resultMap>
<resultMap id="problemsMap" type="com.jzsk.presentation.pojo.bo.AppletDiseaseBO">
<result column="proId" property="proId"/>
<result column="rec_sub_id" property="subId"/>
<result column="picId" property="picId"/>
<result column="pro_type" property="proType"/>
<result column="pro_name" property="proName"/>
<result column="gps_lon" property="lon"/>
<result column="gps_lat" property="lat"/>
<result column="road_id" property="roadId"/>
<result column="interval_id" property="roadIntervalId"/>
<result column="road_direction" property="roadDirection"/>
<result column="chainage" property="chainage"/>
<result column="chainage_offset" property="chainageOffset"/>
<result column="pro_destroy" property="proDestroy"/>
<result column="photo_name" property="photoName"/>
<result column="output_path" property="outputPath"/>
<result column="reported_time" property="findTime"/>
<result column="is_review" property="isReview"/>
</resultMap>
<select id="syncDiseaseInfo" parameterType="com.jzsk.presentation.pojo.bo.AppletSyncDiseaseInfoBO"
resultMap="syncDiseaseInfoMap">
SELECT
rrp.organization_id,
rrp.id as proId,
rrp.rec_sub_id,
cp.id AS picId,
rrp.pro_type,
rrp.pro_name,
rrp.gps_lon,
rrp.gps_lat,
rl.road_id,
rs.interval_id,
rl.road_direction,
rrp.chainage,
rrp.chainage_offset,
rrp.pro_destroy,
rr.photo_name,
rs.output_path,
rs.reported_time,
rs.lane,
rr.is_review
FROM
rec_result_problem rrp
-- 连表的时候 先去查出子表 加快检索效率
LEFT JOIN (SELECT rresult.id,rresult.photo_name,rresult.is_review FROM rec_result rresult WHERE rresult.organization_id = #{organizationId}) AS rr ON rrp.rec_result_id = rr.id
LEFT JOIN (SELECT rsubmit.id,rsubmit.interval_id,rsubmit.output_path,rsubmit.reported_time,rsubmit.lane,rsubmit.pavement_type,rsubmit.locus_id FROM rec_submit rsubmit WHERE rsubmit.organization_id = #{organizationId}) AS rs ON rrp.rec_sub_id = rs.id
LEFT JOIN (SELECT rlocus.road_id,rlocus.id,rlocus.road_direction FROM road_locus rlocus WHERE rlocus.organization_id = #{organizationId}) AS rl ON rl.id = rs.locus_id
LEFT JOIN (SELECT ctask.interval_id,ctask.id FROM capture_task ctask WHERE ctask.organization_id = #{organizationId}) AS ct ON ct.interval_id = rs.interval_id
LEFT JOIN (SELECT cphoto.task_id,cphoto.id FROM capture_photo cphoto WHERE cphoto.organization_id = #{organizationId}) AS cp ON cp.task_id = ct.id
WHERE
rrp.organization_id = #{organizationId}
<if test="lastSyncTime != null and lastSyncTime != ''">
AND rrp.create_time >= #{lastSyncTime}
</if>
<if test="roadSurface != null and roadSurface != ''">
AND rs.pavement_type = #{roadSurface}
</if>
-- 判断传入的集合是否为空
-- 如果传入的是数组 就用 <if test="disease != null and disease.length > 0">
<if test="disease != null and disease.size() > 0">
AND
<foreach collection="disease" item="diseaseInfo" open="(" close=")" separator=" OR ">
-- separator=" OR " 和 这个括号是精髓
-- 比如你传入(A) OR (B) 这里就会取结果的并集
-- 如果不加括号 只是 A OR B ,那么满足一个条件就会返回数据
(
<if test="diseaseInfo.proType != null and diseaseInfo.proType != ''">
rrp.pro_type = #{diseaseInfo.proType}
</if>
<if test="diseaseInfo.upperLimit != null">
AND rrp.pro_destroy <= #{diseaseInfo.upperLimit}
</if>
<if test="diseaseInfo.lowerLimit != null">
AND rrp.pro_destroy >= #{diseaseInfo.lowerLimit}
</if>
)
</foreach>
</if>
</select>5、其他
如果你只是传入一个集合进行查询
mapper接口要加 @parm("")注解
5.1、maapper层接口
java
ResultSectionBO querySectionChainageBySubId(@Param("idList") List<Integer> idList);5.2、sql语句
sql
<select id="querySectionChainageBySubId" resultType="com.jzsk.presentation.pojo.bo.ResultSectionBO">
SELECT MIN(chainage*1000+chainage_offset) AS minChainage,MAX(chainage*1000+chainage_offset) AS maxChainage
FROM REC_RESULT WHERE is_del='N'
<if test="idList != null and idList.size >0">
AND rec_sub_id IN
<foreach collection="idList" index="index" item="item" open="(" separator="," close=")">
#{item}
</foreach>
</if>
</select>