SpringBoot事务管理

1、在UserMapper接口中添加更新和删除方法

package com.cppdy.mapper;

import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

import com.cppdy.entity.User;

@Mapper
public interface UserMapper {

    @Select("select * from user where id=#{id}")
    User getUserById(@Param("id") int id);

    @Insert("insert into user values(NULL,#{name})")
    User insertUser(@Param("name") String name);
    
    @Update("update user set username=#{name} where id=#{id}")
    User update(@Param("id") int id,@Param("name") String name);
    
    @Delete("delete from user where id=#{id}")
    User delete(@Param("id") int id);
}

2、创建UserService接口

package com.cppdy.service;

public interface UserService {
    
    //执行事务
    public void tranfor();

}

3、创建UserServiceImpl实现类（@Transactional开启事务管理）

package com.cppdy.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.cppdy.mapper.UserMapper;
import com.cppdy.service.UserService;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;

    // 开启事务管理
    @Transactional
    public void tranfor() {
        // 更新一条数据
        userMapper.update(2, "cppdy123");
        // 抛出一个异常
        int a = 2 / 0;
        // 删除一条数据
        userMapper.delete(2);
    }

}

4、在HelloWordController类中创建测试方法

@RequestMapping("tranfor")
    public void tranfor() {

        userService.tranfor();
    }