mybatis 多数据源

1.配置多数据源

spring:

  #    mybatis 连接多数据源配置
  db1-mybatis:
    datasource:
      jdbcurl: jdbc:mysql://127.0.0.1:3306/cloud-main1?useUnicode=true&characterEncoding=utf8&useSSL=false&allowMultiQueries=true
      username: root
      password: 123456
      driver-class-name: com.mysql.jdbc.Driver
      type: com.alibaba.druid.pool.DruidDataSource
  db2-mybatis:
    datasource:
      jdbcurl: jdbc:mysql://127.0.0.1:3306/cloud-main2?useUnicode=true&characterEncoding=utf8&useSSL=false&allowMultiQueries=true
      username: root
      password: 123456
      driver-class-name: com.mysql.jdbc.Driver
      type: com.alibaba.druid.pool.DruidDataSource

2.db1 配置

package com.example.demo.mybatis.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.core.io.support.ResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;

@Configuration
@MapperScan(basePackages = "com.example.demo.mybatis.dbs.db1.dao", sqlSessionFactoryRef = "db1SessionFactory")
public class DB1Config {

    @Primary
    @Bean(name = "db1Mybatis")
    @ConfigurationProperties(prefix = "spring.db1-mybatis.datasource")
    public DataSource db1DataSource() {

        return DataSourceBuilder.create().build();
    }

    @Primary
    @Bean(name = "db1TransactionManager")
    public DataSourceTransactionManager transactionManager(@Qualifier("db1Mybatis") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Primary
    @Bean(name = "db1SessionFactory")
    public SqlSessionFactory sqlSessionFactory(@Qualifier("db1Mybatis") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        org.apache.ibatis.session.Configuration configuration = new org.apache.ibatis.session.Configuration();
        configuration.setMapUnderscoreToCamelCase(true);
        bean.setConfiguration(configuration);
        bean.setDataSource(dataSource);
        ResourcePatternResolver rsourcePatternResolver = new PathMatchingResourcePatternResolver();
        bean.setMapperLocations(rsourcePatternResolver.getResources("com/example/demo/mybatis/dbs/db1/mapper/*.xml"));
        return bean.getObject();
    }

    @Primary
    @Bean(name = "db1Template")
    public SqlSessionTemplate sqlSessionTemplate(@Qualifier("db1SessionFactory") SqlSessionFactory sqlSessionFactory) {
        SqlSessionTemplate sqlSessionTemplate = new SqlSessionTemplate(sqlSessionFactory);
        return sqlSessionTemplate;
    }
}

　　3.db2配置

package com.example.demo.mybatis.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 org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;

@Configuration
@MapperScan(basePackages = "com.example.demo.mybatis.dbs.db2.mapper", sqlSessionFactoryRef = "db2SessionFactory")
public class DB2Config {


    @Bean(name = "db2Mybatis")
    @ConfigurationProperties(prefix = "spring.db2-mybatis.datasource")
    public DataSource mysqlDataSource() {

        return DataSourceBuilder.create().build();
    }

    @Bean(name = "db2TransactionManager")
    public DataSourceTransactionManager transactionManager(@Qualifier("db1Mybatis") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Bean(name = "db2SessionFactory")
    public SqlSessionFactory sqlSessionFactory(@Qualifier("db1Mybatis") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        org.apache.ibatis.session.Configuration configuration = new org.apache.ibatis.session.Configuration();
        configuration.setMapUnderscoreToCamelCase(true);
        bean.setConfiguration(configuration);
        bean.setDataSource(dataSource);
        ResourcePatternResolver rsourcePatternResolver = new PathMatchingResourcePatternResolver();
        bean.setMapperLocations(rsourcePatternResolver.getResources("classpath*:com/example/demo/mybatis/dbs/db2/*.xml"));
        return bean.getObject();
    }

    @Bean(name = "db2Template")
    public SqlSessionTemplate sqlSessionTemplate(@Qualifier("db2SessionFactory") SqlSessionFactory sqlSessionFactory) {
        SqlSessionTemplate sqlSessionTemplate = new SqlSessionTemplate(sqlSessionFactory);
        return sqlSessionTemplate;
    }
}

　　3.实体Modle

public class User {
………………
}

4.*Mapper.xml　　

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.example.demo.mybatis.dbs.db1.dao.UserMapper" >
  <resultMap id="BaseResultMap" type="com.example.demo.mybatis.dbs.db1.model.User" >
    <constructor >
      <idArg column="USER_ID" jdbcType="CHAR" javaType="java.lang.String" />
      <arg column="LOGIN_NAME" jdbcType="VARCHAR" javaType="java.lang.String" />
      <arg column="PASSWORD" jdbcType="VARCHAR" javaType="java.lang.String" />
      <arg column="PHONE" jdbcType="VARCHAR" javaType="java.lang.String" />
      <arg column="EMAIL" jdbcType="VARCHAR" javaType="java.lang.String" />
      <arg column="FULL_NAME" jdbcType="VARCHAR" javaType="java.lang.String" />
      <arg column="AVATAR_URL" jdbcType="VARCHAR" javaType="java.lang.String" />
      <arg column="JOB_TITLE" jdbcType="VARCHAR" javaType="java.lang.String" />
      <arg column="COM_ID" jdbcType="VARCHAR" javaType="java.lang.String" />
      <arg column="DEPT_ID" jdbcType="CHAR" javaType="java.lang.String" />
      <arg column="ROLE_ID" jdbcType="CHAR" javaType="java.lang.String" />
      <arg column="IS_DISABLED" jdbcType="CHAR" javaType="java.lang.String" />
      <arg column="QUICK_CODE" jdbcType="VARCHAR" javaType="java.lang.String" />
      <arg column="CREATED_BY" jdbcType="CHAR" javaType="java.lang.String" />
      <arg column="CREATED_ON" jdbcType="TIMESTAMP" javaType="java.util.Date" />
      <arg column="MODIFIED_ON" jdbcType="TIMESTAMP" javaType="java.util.Date" />
      <arg column="MODIFIED_BY" jdbcType="CHAR" javaType="java.lang.String" />
      <arg column="TOKEN" jdbcType="VARCHAR" javaType="java.lang.String" />
    </constructor>
  </resultMap>
 
   …………
</mapper>

5.调用

 @Autowired
    @Resource(name = "db1Template")
    private SqlSessionTemplate sqlSessionTemplate;


    public Test getTest(Long id) {
        return sqlSessionTemplate.selectOne("com.example.demo.mybatis.dbs.db1.dao.UserMapper.getuser",id);
    }

　　注意：

　　2、3注意路径， 不需要dao层