SpringBoot增删改查

Posted 2021-09-04 Jason_ou2021

XML mapper文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.demo.mapper.UserMapper">
    <select id="AllUser" resultType="com.example.demo.Entity.UserEntity">
        select * from user
    </select>
    <insert id="AddUser" useGeneratedKeys="true" keyProperty="id" parameterType="com.example.demo.Entity.UserEntity">
        insert into user(name, passwd, create_time, update_time, is_delete) values(#{name},#{passwd},#{create_time},#{update_time},#{is_delete})
    </insert>
    <select id="GetOneUser" resultType="com.example.demo.Entity.UserEntity">
        select * from user where id = (#{id})
    </select>
    <update id="UpdateUser" parameterType="com.example.demo.Entity.UserEntity">
        update user set name = #{name}, passwd = #{passwd}, update_time = #{update_time}, is_delete = #{is_delete} where id = #{id}
    </update>
    <delete id="DeleteUser" parameterType="com.example.demo.Entity.UserEntity">
        delete from user where id = #{id}
    </delete>
</mapper>

Controller文件

package com.example.demo.controller;

import com.example.demo.Entity.UserEntity;
import com.example.demo.service.ServiceImpl.UserServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

import java.util.Date;
import java.util.List;

@Controller
public class HelloController {

    @Autowired
    private UserServiceImpl userService;

    @GetMapping("all_user")
    @ResponseBody
    public List<UserEntity> hello(){
        return userService.AllUser();
    }

    @PostMapping("add_user")
    @ResponseBody
    public long add_user(String name, String passwd){
        UserEntity userEntity = new UserEntity();
        userEntity.setName(name);
        userEntity.setPasswd(passwd);
        userEntity.setCreate_time(new Date());
        userEntity.setUpdate_time(new Date());
        userEntity.setIs_delete("0");
        return userService.AddUser(userEntity);
    }

    @GetMapping("get_one_user")
    @ResponseBody
    public UserEntity get_one_user(long id){
        return userService.GetOneUser(id);
    }

    @PutMapping("update_user")
    @ResponseBody
    public int update_user(UserEntity user){
        user.setUpdate_time(new Date());
        return userService.UpdateUser(user);
    }

    @DeleteMapping("delete_user")
    @ResponseBody
    public int delete_user(long id){
        return userService.DeleteUser(id);
    }
}

服务接口类和mapper接口类代码一样的   注意：包名不一样

package com.example.demo.mapper;

import com.example.demo.Entity.UserEntity;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

@Mapper
public interface UserMapper {

    List<UserEntity> AllUser();
    long AddUser(UserEntity userEntity);
    UserEntity GetOneUser(long id);
    int UpdateUser(UserEntity user);
    int DeleteUser(long id);
}

服务实现类

package com.example.demo.service.ServiceImpl;

import com.example.demo.Entity.UserEntity;
import com.example.demo.mapper.UserMapper;
import com.example.demo.service.UserService;
import org.springframework.stereotype.Service;

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

@Service
public class UserServiceImpl implements UserService {

    @Resource
    private UserMapper userMapper;

    @Override
    public List<UserEntity> AllUser() {
        return userMapper.AllUser();
    }

    @Override
    public long AddUser(UserEntity userEntity) {
        return userMapper.AddUser(userEntity);
    }

    @Override
    public UserEntity GetOneUser(long id) {
        return userMapper.GetOneUser(id);
    }

    @Override
    public int UpdateUser(UserEntity user) {
        return userMapper.UpdateUser(user);
    }

    @Override
    public int DeleteUser(long id) {
        return userMapper.DeleteUser(id);
    }
}

实体类

package com.example.demo.Entity;

import com.fasterxml.jackson.annotation.JsonFormat;
import lombok.Data;
import lombok.ToString;

import java.util.Date;


@Data
@ToString
public class UserEntity {
    private long id;
    private String name;
    private String passwd;
    @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
    private Date create_time;
    @JsonFormat(shape= JsonFormat.Shape.STRING,pattern="yyyy-MM-dd HH:mm:ss",timezone="GMT+8")
    private Date update_time;
    private String is_delete;
}

数据库

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user`  (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `passwd` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `create_time` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `update_time` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `is_delete` tinyint(3) NULL DEFAULT NULL COMMENT '0,否，1，是',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 22 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;

SET FOREIGN_KEY_CHECKS = 1;