（十四）SpringBoot之事務處理

1、簡介

ssh ssm都有事務管理service層經過applicationContext.xml配置，全部service方法都加上事務操做；

用來保證一致性，即service方法裏的多個dao操做，要麼同時成功，要麼同時失敗；

springboot下的話，在service方法上加上@Transactional便可

 

2、案例

 　　2.1　　controller

package com.shyroke.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.shyroke.dao.UserMapper;
import com.shyroke.entity.UserBean;
import com.shyroke.service.UserService;

@Controller
@RequestMapping(value = "/")
public class IndexController {

    @Autowired
    private UserService userService;
    
    @ResponseBody
    @RequestMapping(value="/save")
    public String list() {
    
        UserBean user1=new UserBean();
        user1.setUserName("user1");
        user1.setPassWord("123");
    
        userService.save(user1);
        
        return "index";
        
        
    }
}

 

• service

package com.shyroke.service;

import com.shyroke.entity.UserBean;

public interface UserService {

    void save(UserBean user1);

}

 

• service實現類

　　在下面的代碼中，咱們對save方法加上了@Transactional註解，表示使用事務，當有異常拋出時，就會自動回滾。

package com.shyroke.service.impl;

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

import com.shyroke.dao.UserMapper;
import com.shyroke.entity.UserBean;
import com.shyroke.service.UserService;

@Service
public class UserServiceImpl implements UserService{

    @Autowired
    private UserMapper userMapper;
    
    @Override
    @Transactional public void save(UserBean user1) {
    
        userMapper.save(user1);
        
        boolean flag = true;
        if (flag) {
        throw new RuntimeException();
        }
        
    }

}

 

• mapper

package com.shyroke.dao;

import org.springframework.data.jpa.repository.JpaRepository;

import com.shyroke.entity.UserBean;

public interface UserMapper extends JpaRepository<UserBean, Integer>{

}

 

• 　　結果：

數據庫沒有數據，說明已經被回滾了。