springboot 配置双数据源

springboot 2.6.1版本配置信息

spring:
  datasource:
    db1: # 数据源1
      jdbc-url: jdbc:mysql://127.0.0.1:3306/kuming?characterEncoding=utf8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=Asia/Shanghai
      username: root
      password: root
      driver-class-name: com.mysql.jdbc.Driver
      test-on-borrow: true
      validation-query: select 1

    db2: # 数据源2
      jdbc-url: jdbc:oracle:thin:@127.0.0.1:1521/kuming?characterEncoding=utf8&useUnicode=true&useSSL=false&serverTimezone=Asia/Shanghai
      username: root
      password: root
      driver-class-name: oracle.jdbc.driver.OracleDriver

springboot 1.5.22版本配置信息

spring:
  datasource:
    db1: # 数据源1
      url: jdbc:mysql://127.0.0.1:3306/kuming?characterEncoding=utf8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=Asia/Shanghai
      username: root
      password: root
      driver-class-name: com.mysql.jdbc.Driver
      test-on-borrow: true
      validation-query: select 1

    db2: # 数据源2
      jdbc-url: jdbc:oracle:thin:@//10.217.62.64:1521/kuming
      username: root
      password: root
      driver-class-name: oracle.jdbc.driver.OracleDriver

注意报错信息

报url 为空时 注意看 DataSourceConfig1 里的DataSource 对象下的 是不是url 因为有可能是jdbc-url

加载数据库链接类

mysql

package com.duoshujvyuan.demo.config;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

import javax.sql.DataSource;

@Configuration
@MapperScan(basePackages = "com.duoshujvyuan.demo.mapper.db1", sqlSessionFactoryRef = "db1SqlSessionFactory")
public class DataSourceConfig1 {

    @Primary // 表示这个数据源是默认数据源, 这个注解必须要加，因为不加的话spring将分不清楚那个为主数据源（默认数据源）
    @Bean("db1DataSource")
    @ConfigurationProperties(prefix = "spring.datasource.db1") //读取application.yml中的配置参数映射成为一个对象
    public DataSource getDb1DataSource(){
        return DataSourceBuilder.create().build();
    }

    @Primary
    @Bean("db1SqlSessionFactory")
    public SqlSessionFactory db1SqlSessionFactory(@Qualifier("db1DataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        // mapper的xml形式文件位置必须要配置，不然将报错：no statement （这种错误也可能是mapper的xml中，namespace与项目的路径不一致导致）
        bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:mapping/db1/*.xml"));
        return bean.getObject();
    }

    @Primary
    @Bean("db1SqlSessionTemplate")
    public SqlSessionTemplate db1SqlSessionTemplate(@Qualifier("db1SqlSessionFactory") SqlSessionFactory sqlSessionFactory){
        return new SqlSessionTemplate(sqlSessionFactory);
    }
}

oracle

package com.duoshujvyuan.demo.config;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

import javax.sql.DataSource;

@Configuration
@MapperScan(basePackages = "com.duoshujvyuan.demo.mapper.db2", sqlSessionFactoryRef = "db2SqlSessionFactory")
public class DataSourceConfig2 {

    @Bean("db2DataSource")
    @ConfigurationProperties(prefix = "spring.datasource.db2")
    public DataSource getDb1DataSource(){
        return DataSourceBuilder.create().build();
    }

    @Bean("db2SqlSessionFactory")
    public SqlSessionFactory db1SqlSessionFactory(@Qualifier("db2DataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:mapping/db2/*.xml"));
        return bean.getObject();
    }

    @Bean("db2SqlSessionTemplate")
    public SqlSessionTemplate db1SqlSessionTemplate(@Qualifier("db2SqlSessionFactory") SqlSessionFactory sqlSessionFactory){
        return new SqlSessionTemplate(sqlSessionFactory);
    }
}

特别注意oracle的链接方式

JDBC Thin Driver 的formats 有三种格式：

格式一:  Oracle JDBC Thin using a ServiceName:

jdbc:oracle:thin:@//:/

Example: jdbc:oracle:thin:@//192.168.2.1:1521/XE

注意这里的格式，@后面有//, 这是与使用SID的主要区别。

这种格式是Oracle 推荐的格式，因为对于集群来说，每个节点的SID 是不一样的，但是SERVICE_NAME 确可以包含所有节点。

格式二: Oracle JDBC Thin using an SID:

jdbc:oracle:thin:@::

Example: jdbc:oracle:thin:192.168.2.1:1521:X01A

Note: Support for SID is being phased out. Oracle recommends that users switch over to usingservice names.

格式三：Oracle JDBC Thin using a TNSName:

jdbc:oracle:thin:@

Example: jdbc:oracle:thin:@GL

Note:

Support for TNSNames was added in the driver release 10.2.0.1
 

附上项目结构图