四、SpringBoot实现增删改查

一、新建项目

二、代码编写

项目结构

先在resource文件夹中创建application.yml编写数据库连接配置

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://106.15.105.2:3306/oms?serverTimezone=GMT%2B8&characterEncoding=utf8&useSSL=true
    username: user1
    password: 123456

在po包下编写user实体类

package edu.nynu.demo01.po;

public class User {
    private Integer id;
    private String name;
    private String pwd;

    public User() {}

    public User(Integer id, String name, String pwd) {
        this.id = id;
        this.name = name;
        this.pwd = pwd;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPwd() {
        return pwd;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", pwd='" + pwd + '\'' +
                '}';
    }
}

在dao包下编写UserDao.java接口

package edu.nynu.demo01.dao;

import edu.nynu.demo01.po.User;
import org.apache.ibatis.annotations.*;

import java.util.List;
@Mapper
public interface UserDao {
    @Select("select * from user1")
    List<User> findAll();
    @Select("select * from user1 where name=#{name} and pwd=#{pwd}")
    User findByNameAndPwd(@Param("name") String name, @Param("pwd") String pwd);
    @Insert("insert into user1 values(#{id}, #{name}, #{pwd})")
    Integer addByUser(User user);
    @Delete("delete from user1 where id=#{id}")
    Integer deleteUserById(Integer id);
    @Update("update user1 set name=#{name}, pwd=#{pwd} where id=#{id}")
    Integer updateNameAndPwdById(@Param("id") Integer id, @Param("name") String name, @Param("pwd") String pwd);

}

在service包下编写UserService.java接口

package edu.nynu.demo01.service;

import edu.nynu.demo01.po.User;
import org.apache.ibatis.annotations.Insert;
import org.springframework.stereotype.Service;

import java.util.List;

public interface UserService {
    List<User> findAllUser();

    User findUser(String name, String pwd);

    Integer addUser(User user);

    Integer deleteUser(Integer id);

    Integer updateUserInfo(Integer id, String name, String pwd);
}

在service包下做UserService接口的实现类UserServiceImpl.java

package edu.nynu.demo01.service.impl;

import edu.nynu.demo01.dao.UserDao;
import edu.nynu.demo01.po.User;
import edu.nynu.demo01.service.UserService;
import org.apache.ibatis.annotations.Insert;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private UserDao userDao;


    @Override
    public List<User> findAllUser() {
        return userDao.findAll();
    }

    @Override
    public User findUser(String name, String pwd) {
        return userDao.findByNameAndPwd(name, pwd);
    }

    @Override
    public Integer addUser(User user) {
        return userDao.addByUser(user);
    }

    @Override
    public Integer deleteUser(Integer id) {
        return userDao.deleteUserById(id);
    }

    @Override
    public Integer updateUserInfo(Integer id, String name, String pwd) {
        return userDao.updateNameAndPwdById(id, name, pwd);
    }
}

在controller包下编写UserController.java

package edu.nynu.demo01.controller;

import edu.nynu.demo01.po.User;
import edu.nynu.demo01.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class UserController {
    @Autowired
    private UserService userService;
    @RequestMapping("/f1")
    public String findAllUser(){
        return userService.findAllUser().toString();
    }
    @RequestMapping("/f2")
    public User findUser(String name, String pwd){
        name = "张三";
        pwd = "123456";
        return userService.findUser(name, pwd);
    }
    @RequestMapping("/add")
    public Integer addUser(User user){
        user.setName("张三");
        user.setPwd("123456");
        return userService.addUser(user);
    }
    @RequestMapping("/delete")
    public Integer deleteUser(Integer id){
        id = 1;
        return userService.deleteUser(id);
    }
    @RequestMapping("/update")
    public Integer update(Integer id, String name, String pwd){
        id = 1;
        name = "李四";
        pwd = "654321";
        return userService.updateUserInfo(id, name, pwd);
    }
}

三、结语

本片文章使用SpringBoot实现了对数据库的增删改查，还是很简单的