Mybatis-plus 入门

## 配置数据源
spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/mybatis-plus?useUnicode=true&characterEncoding=utf8&useSSL=false&serverTimezone=UTC&rewriteBatchedStatements=true
    username: root
    password: 123456
## 配置日志
mybatis-plus:
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

package com.liu.pojo;

import lombok.Data;
@Data
public class User {
        private Long id;
        private String name;
        private Integer age;
        private String email;

}

package com.liu.mapper;

import com.baomidou.mybatisplus.core.mapper.baseMapper;
import com.liu.pojo.User;

import org.springframework.stereotype.Repository;

@Repository
//注解表示是持久层
public interface UserMapper extends baseMapper {

}

package com.liu;

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

//扫描mapper文件
@MapperScan("com.liu.mapper")
@SpringBootApplication
public class MybatisPlusApplication {

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

}

package com.liu;

import com.liu.mapper.UserMapper;
import com.liu.pojo.User;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.List;

@SpringBootTest
class MybatisPlusApplicationTests {

    @Autowired
    public UserMapper userMapper;


    @Test
    void contextLoads() {


        List users = userMapper.selectList(null);
        users.forEach(System.out::println);


    }

}