SpringBoot实战教程（8）| 整合mybatis-plus

MyBatis-Plus (opens new window)（简称 MP）是一个 MyBatis (opens new window)的增强工具，在 MyBatis 的基础上只做增强不做改变，为简化开发、提高效率而生。

mybatis-plus官网地址：​​https://baomidou.com/​​

目录

​​一、初始化springboot项目​​

​​二、引入依赖文件​​

​​三、编写配置文件​​

​​四、编写测试案例​​

​​User.java​​

​​ UserMapper.java​​

​​ UserService.java​​

​​ UserServiceImpl.java​​

​​ UserController.java​​

​​ SpringbootDemoMybatisPlusApplication.java​​

​​五、导入数据库脚本​​

​​六、预览结果展示​​

一、初始化springboot项目

二、引入依赖文件

<dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.6.1</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.27</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.3.4</version>
        </dependency>

三、编写配置文件

application.yml

spring:
  datasource:
    # 数据源mysql驱动
    driver-class-name: com.mysql.cj.jdbc.Driver
    # 数据源url地址
    url: jdbc:mysql://localhost:3306/springboot-mybatis-plus?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
    # 数据库连接用户名
    username: root
    # 数据库连接密码
    password: 123456

#控制台打印sql
mybatis-plus:
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

四、编写测试案例

User.java

package com.csdn.entity;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@TableName("sys_user")
@AllArgsConstructor
@NoArgsConstructor
public class User {

    @TableId(type = IdType.AUTO)
    private Long id;

    @TableField(value = "username")
    private String username;

    @TableField(value = "password")
    private String password;
}

 UserMapper.java

package com.csdn.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.csdn.entity.User;
import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface UserMapper extends BaseMapper<User> {
}

 UserService.java

package com.csdn.service;

import com.csdn.entity.User;

import java.util.List;

public interface UserService {

    public List<User> findAllUsers();
}

 UserServiceImpl.java

package com.csdn.service.impl;

import com.csdn.entity.User;
import com.csdn.mapper.UserMapper;
import com.csdn.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;

    public List<User> findAllUsers() {
        return userMapper.selectList(null);
    }
}

 UserController.java

package com.csdn.controller;

import com.csdn.entity.User;
import com.csdn.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class UserController {

    @Autowired
    private UserService userService;

    @GetMapping("/users")
    public List<User> findAllUsers() {
        return userService.findAllUsers();
    }
}

 SpringbootDemoMybatisPlusApplication.java

package com.csdn;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.csdn.mapper")
public class SpringbootDemoMybatisPlusApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringbootDemoMybatisPlusApplication.class, args);
    }

}

五、导入数据库脚本

sys_user.sql

/*
 Navicat Premium Data Transfer

 Source Server         : 本地数据库
 Source Server Type    : MySQL
 Source Server Version : 50733
 Source Host           : localhost:3306
 Source Schema         : springboot-mybatis-plus

 Target Server Type    : MySQL
 Target Server Version : 50733
 File Encoding         : 65001

 Date: 19/12/2021 07:45:11
*/

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for sys_user
-- ----------------------------
DROP TABLE IF EXISTS `sys_user`;
CREATE TABLE `sys_user`  (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `username` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NULL DEFAULT NULL,
  `password` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 3 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_bin ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of sys_user
-- ----------------------------
INSERT INTO `sys_user` VALUES (1, 'admin1', '123456');
INSERT INTO `sys_user` VALUES (2, 'admin2', '123456');

SET FOREIGN_KEY_CHECKS = 1;

六、预览结果展示