超简单的SpringBoot集成mybatisPlus，不行你打我

一：新建springboot项目

二：添加pom依赖

        
            mysql
            mysql-connector-java
            runtime
        
        
            com.baomidou
            mybatis-plus-boot-starter
            3.1.1
        
        
            org.projectlombok
            lombok
        

三：在数据库中新建user表

CREATE TABLE `user` (
  `id` int(23) NOT NULL AUTO_INCREMENT,
  `username` varchar(34) DEFAULT NULL,
  `password` varchar(34) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=22 DEFAULT CHARSET=utf8;

四：修改application.properties

#MySQL
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/mybatis?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&useSSL=FALSE
spring.datasource.username=root
spring.datasource.password=1234
mybatis.configuration.map-underscore-to-camel-case=true
server.port=7373

 

五：在项目中新建entity包和实体类User，字段要与数据库对应

package com.example.mybatiesplus.entity;

import lombok.Data;

/**
 * @program: mybatiesplus
 * @Date: 2020/1/5 22:20
 * @Author: Mr.huang
 * @Description:
 */
@Data
public class User {
    private int id;
    private String username;
    private String password;
}

六：在项目中新建mapper包和UserMapper接口，接口继承BaseMapper接口，泛型给实体类User

package com.example.mybatiesplus.mapper;

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

/**
 * @program: mybatiesplus
 * @Date: 2020/1/5 21:48
 * @Author: Mr.huang
 * @Description:
 */
@Mapper
public interface UserMapper extends BaseMapper {
}

至此，完成基本的配置，开始测试。

在test目录下新建UserMapperTest类，如下图。

package com.example.mybatiesplus;

import com.example.mybatiesplus.entity.User;
import com.example.mybatiesplus.mapper.UserMapper;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.ArrayList;
import java.util.List;

/**
 * @program: mybatiesplus
 * @Date: 2020/1/5 22:25
 * @Author: Mr.huang
 * @Description:
 */
@SpringBootTest
@RunWith(SpringRunner.class)
public class UserMapperTest {
    @Autowired
    private UserMapper userMapper;
    //测试添加操作
    @Test
    public void testAdd(){
        User user1 = new User();
        user1.setUsername("xinz");
        user1.setPassword("33333");
        int insert = userMapper.insert(user1);
        System.out.println(insert);
        Assert.assertEquals(1,insert);
    }
    //测试查询操作
    @Test
    public void testSelect(){
        //根据单个ID查询
//        User user = userMapper.selectById(21);
//        System.out.println(user);
        //根据批量ID查询
        ArrayList integers = new ArrayList<>();
        integers.add(1);
        integers.add(2);
        integers.add(3);
        integers.add(4);
        List users = userMapper.selectBatchIds(integers);
        for (User user2 : users) {
            System.out.println(user2);
        }
    }
    //测试删除
    @Test
    public void testDelete(){
        int i = userMapper.deleteById(22);
        System.out.println(i);
    }
    //测试根据id更新
    @Test
    public void update(){
        User user = userMapper.selectById(1);
        user.setUsername("hhhhhhhhhh");
        user.setPassword("33333333");
        userMapper.updateById(user);
    }
}

最终项目结构如下