问题描述
Oceanbase的Oracle租户时分页报错不认识Limit,由于Limit是mysql的分页形式,这里认为应该是Oceanbase的Oracle租户被错误的识别成了mysql方言
原因分析:
观察pageInteceptor拦截器配置
java
@Bean
public MybatisPlusInterceptor mybatisPlusInterceptor() {
MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
PaginationInnerInterceptor paginationInnerInterceptor = new PaginationInnerInterceptor();
//多数据源不能写死DbType
// paginationInnerInterceptor.setDbType(DbType.ORACLE);
paginationInnerInterceptor.setOverflow(false);
interceptor.addInnerInterceptor(paginationInnerInterceptor);
return interceptor;
}
发现使用的拦截器PaginationInnerInterceptor中配置获取方言的逻辑为
java
/**
* 获取分页方言类的逻辑
*
* @param executor Executor
* @return 分页方言类
*/
protected IDialect findIDialect(Executor executor) {
if (dialect != null) {
return dialect;
}
if (dbType != null) {
dialect = DialectFactory.getDialect(dbType);
return dialect;
}
return DialectFactory.getDialect(JdbcUtils.getDbType(executor));
}
其中DialectFactory.getDialect方法为
java
public static IDialect getDialect(DbType dbType) {
IDialect dialect = DIALECT_ENUM_MAP.get(dbType);
if (null == dialect) {
if (dbType == DbType.OTHER) {
throw ExceptionUtils.mpe("%s database not supported.", dbType.getDb());
}
// mysql same type
else if (dbType == DbType.MYSQL
|| dbType == DbType.MARIADB
|| dbType == DbType.GBASE
|| dbType == DbType.OSCAR
|| dbType == DbType.XU_GU
|| dbType == DbType.CLICK_HOUSE
|| dbType == DbType.OCEAN_BASE
|| dbType == DbType.CUBRID
|| dbType == DbType.SUNDB) {
dialect = new MySqlDialect();
}
// oracle same type
else if (dbType == DbType.ORACLE
|| dbType == DbType.DM
|| dbType == DbType.GAUSS) {
dialect = new OracleDialect();
}
// postgresql same type
else if (dbType == DbType.POSTGRE_SQL
|| dbType == DbType.H2
|| dbType == DbType.LEALONE
|| dbType == DbType.SQLITE
|| dbType == DbType.HSQL
|| dbType == DbType.KINGBASE_ES
|| dbType == DbType.PHOENIX
|| dbType == DbType.SAP_HANA
|| dbType == DbType.IMPALA
|| dbType == DbType.HIGH_GO
|| dbType == DbType.VERTICA
|| dbType == DbType.REDSHIFT
|| dbType == DbType.OPENGAUSS
|| dbType == DbType.TDENGINE
|| dbType == DbType.UXDB
|| dbType == DbType.GBASE8S_PG
|| dbType == DbType.GBASE_8C) {
dialect = new PostgreDialect();
}
// other types
else if (dbType == DbType.ORACLE_12C
|| dbType == DbType.FIREBIRD
|| dbType == DbType.SQL_SERVER) {
dialect = new Oracle12cDialect();
} else if (dbType == DbType.DB2) {
dialect = new DB2Dialect();
} else if (dbType == DbType.SQL_SERVER2005) {
dialect = new SQLServer2005Dialect();
} else if (dbType == DbType.SYBASE) {
dialect = new SybaseDialect();
} else if (dbType == DbType.XCloud) {
dialect = new XCloudDialect();
} else if (dbType == DbType.GBASE_8S
|| dbType == DbType.GBASEDBT
|| dbType == DbType.GBASE_INFORMIX
|| dbType == DbType.SINODB) {
dialect = new GBase8sDialect();
} else if (dbType == DbType.INFORMIX) {
dialect = new InformixDialect();
} else if (dbType == DbType.TRINO
|| dbType == DbType.PRESTO) {
dialect = new TrinoDialect();
}
DIALECT_ENUM_MAP.put(dbType, dialect);
}
return dialect;
}
此时发现oceanbase的方言设置为mysql
并未区分mysql租户和oracle租户
解决方案:
设置一个自定义拦截器MybatisPlusInterceptor
java
package com.xquant.xtam.common.datasource.support;
import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
import com.baomidou.mybatisplus.extension.plugins.pagination.DialectFactory;
import com.baomidou.mybatisplus.extension.plugins.pagination.dialects.IDialect;
import com.baomidou.mybatisplus.extension.toolkit.JdbcUtils;
import org.apache.ibatis.executor.Executor;
public class CustomPaginationInnerInterceptor extends PaginationInnerInterceptor {
/**
* 获取分页方言类的逻辑
*
* @param executor Executor
* @return 分页方言类
*/
@Override
protected IDialect findIDialect(Executor executor) {
if (this.getDialect() != null) {
return this.getDialect();
}
if (this.getDialect() != null) {
this.setDialect(DialectFactory.getDialect(this.getDbType()));
return this.getDialect();
}
// 这个地方特殊处理一下,认为 OceanBase 是 Oracle,无法处理 OceanBase 的Oracle租户
DbType dbType = JdbcUtils.getDbType(executor);
if (dbType == DbType.OCEAN_BASE) {
dbType = DbType.ORACLE;
}
return DialectFactory.getDialect(dbType);
}
}
也可以通过修改jdbc工具类,或者自定义方言形式去添加一些小众,不识别的方言配置