摘要：一定義兩個數據源和生成數據源注解聲明為默認數據源創建配置事務管理二注意不同的數據源的類一定不能放在一個包下否則只掃描一個數據源即只會使用一個數據源里一個不會加載三配置文件使用數據源使用數據源四修改對應位置的代碼使用時可自動切換數據源

一.定義兩個數據源DataSource1Config 和DataSource2Config

package com.rainbow.test.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 org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;

@Configuration
@MapperScan(basePackages = "com.rainbow.test.mapper.test1", sqlSessionTemplateRef = "db1SqlSessionTemplate")
public class DataSource1Config {

    /**
     * 生成數據源.  @Primary 注解聲明為默認數據源
     */
    @Bean(name = "db1DataSource")
    @ConfigurationProperties(prefix = "spring.datasource.test")

    public DataSource testDataSource() {
        return DataSourceBuilder.create().build();
    }

    /**
     * 創建 SqlSessionFactory
     */
    @Bean(name = "db1SqlSessionFactory")
    public SqlSessionFactory testSqlSessionFactory(@Qualifier("db1DataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:com/rainbow/test/mapper/test1/*.xml"));

        //  bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/db1/*.xml"));
        return bean.getObject();
    }

    /**
     * 配置事務管理
     */
    @Bean(name = "db1TransactionManager")
    public DataSourceTransactionManager testTransactionManager(@Qualifier("db1DataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Bean(name = "db1SqlSessionTemplate")
    public SqlSessionTemplate testSqlSessionTemplate(@Qualifier("db1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }

}

package com.rainbow.test.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 org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;

@Configuration
@MapperScan(basePackages = "com.rainbow.test.mapper.test2", sqlSessionTemplateRef = "db2SqlSessionTemplate")
public class DataSource2Config {

    @Bean(name = "db2DataSource")
    @ConfigurationProperties(prefix = "spring.datasource.test1")
    @Primary
    public DataSource testDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "db2SqlSessionFactory")
    @Primary
    public SqlSessionFactory testSqlSessionFactory(@Qualifier("db2DataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:com/rainbow/test/mapper/test2/*.xml"));
        return bean.getObject();
    }

    @Bean(name = "db2TransactionManager")
    @Primary
    public DataSourceTransactionManager testTransactionManager(@Qualifier("db2DataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Bean(name = "db2SqlSessionTemplate")
    @Primary
    public SqlSessionTemplate testSqlSessionTemplate(@Qualifier("db2SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }

}

二.注意不同的數據源的mapper類一定不能放在一個包下,否則@mapperscan只掃描一個數據源,即只會使用一個數據源,里一個不會加載

三.配置yml文件

spring:
  datasource:
    test:
      # 使用druid數據源
      type: com.alibaba.druid.pool.DruidDataSource
      jdbc-url: jdbc:mysql://localhost:3306/test?serverTimezone=CTT&useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true
      username: root
      password: root
      driver-class-name: com.mysql.jdbc.Driver

    test1:
      # 使用druid數據源
      type: com.alibaba.druid.pool.DruidDataSource
      jdbc-url: jdbc:oracle:thin:@172.16.182.18:1521:orcl
      username: policyprint
      password: sinosoft
      driver-class-name: oracle.jdbc.OracleDriver

四.修改對應位置的代碼,使用時可自動切換數據源