Springboot 增删改查(简单版)

User.java:

package com.edward.helloworld.entity;

import lombok.Data;


@Data
public class User {
    private int id;
    private String name;
    private int age;
    private  int salary;
}

UserMapper.java:

package com.edward.helloworld.mapper;

import com.edward.helloworld.entity.User;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

public interface UserMapper {

    // 查
    @Select("select * from user")
    List findAll();

    // 增
    @Update("INSERT INTO `user` (`name`, `age`, `salary`) VALUES (#{name},#{age},#{salary});")
    @Transactional
    void save(User user);

    // 改
    @Update("update user set name=#{name}, age=#{age}, salary=#{salary} where id=#{id};")
    @Transactional
    void updateById(User user);

    // 删
    @Update("delete from user where id=#{id}")
    @Transactional
    void deleteById(int id);
}

UserController.java:

package com.edward.helloworld.controller;


import com.edward.helloworld.entity.User;
import com.edward.helloworld.mapper.UserMapper;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;
import java.util.List;

@RestController
@RequestMapping("/user")
public class UserController {

    // 引入接口
    @Resource
    UserMapper userMapper;    

    @GetMapping
    public String getUser() {
        return "user";
    }

    @GetMapping("/all")
    public List getAllUser () {
        return userMapper.findAll();
    }

    @PostMapping("/add")
    public String addUser(@RequestBody User user) {
        userMapper.save(user);
        return "add success";
    }

    @PutMapping("/update") // 或 @PostMapping("/update")
    public String updateUser(@RequestBody User user) {
        userMapper.updateById(user);
        return "update success";
    }

    @DeleteMapping("/delete/{id}") // 或 @GetMapping("/delete/{id}")
    public String deleteUser(@PathVariable("id") int id) {
        userMapper.deleteById(id);
        return "delete success";
    }
}

修改前的数据表：

Postman 调试：

修改后的数据表：