package com.test.mapper;
import com.baomidou.dynamic.datasource.annotation.DS;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Update;
//數(shù)據源1
@DS("db1")
@Mapper
public interface Test1Dao {
    @Update("update test1 set name = #{name} where id = #{id}")
    void updateById(@Param("id")Integer id, @Param("name")String name);
}

package com.test.mapper;
import com.baomidou.dynamic.datasource.annotation.DS;
import com.test.datasources.DataSourceNames;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Update;
//數(shù)據源2
@DS(“db2”)
@Mapper
public interface Test2Dao {
    @Update("update test2 set name = #{name} where id = #{id}")
    void updateById(@Param("id")Integer id, @Param("name")String name);
}

package com.test.service;
import com.baomidou.dynamic.datasource.annotation.DS;
import com.baomidou.dynamic.datasource.annotation.DSTransactional;
import com.test.mapper.Test1Dao;
import com.test.mapper.Test2Dao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
@Service
public class TestService {
    @Autowired
    private Test1Dao test1Dao;
    @Autowired
    private Test2Dao test2Dao;
    /**
     * 同一個數(shù)據源中的事務，都是數(shù)據源2
     * 這里用的是spring的事務注解Transactional
     * 這里必須加上注解多數(shù)據源注解@DS("db2")，否則使用的是默認數(shù)據源
     */
    @DS("db2")
    @Transactional
    public void theSame() {
        test2Dao.updateById(2,"第一次修改");
        test2Dao.updateById(2,"第二次修改");
        //這里報錯回滾
        int i = 1/0;
    }
    /**
     * 多數(shù)據源中的事務，同時使用數(shù)據源1、2
     * 如果這里用spring的事務注解Transactional，那么使用的是默認數(shù)據源
     * 這里不需要加上注解@DS
     */
    @DSTransactional
    public void notAlike() {
        test1Dao.updateById(1,"第一次修改");
        test2Dao.updateById(2,"第二次修改");
        //這里報錯回滾
        int i = 1/0;
    }
}