spring-boot集成mybatis-plus

• spring-boot集成mybatis-plus
  • 依赖
  • 配置
    • application.properties文件
    • 启动类添加@Mapper注解
  • 编码
    • 实体类
    • Mapper类
    • Service类
  • 测试
    • @Test测试
    • 测试结果

依赖

		<dependency>
			<groupId>com.baomidou</groupId>
			<artifactId>mybatis-plus-boot-starter</artifactId>
			<version>3.5.3.1</version>
		</dependency>

配置

application.properties文件

spring.datasource.url=jdbc:mysql://192.168.111.222:3306/dbname?serverTimezone=Asia/Shanghai&characterEncoding=utf-8&autoReconnect=true&useSSL=false
spring.datasource.username=root
spring.datasource.password=xxx
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

启动类添加@Mapper注解

在 Spring Boot 启动类中添加 @MapperScan 注解，扫描 Mapper 文件夹：

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

@SpringBootApplication
@MapperScan("com.qq.quickstart")
public class QuickstartApplication {

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

}

编码

实体类

import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;

@Data
@TableName("user")
public class User {
    @TableId
    private Long id;
    private String username;
    private String password;
}

Mapper类

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

//如果启动类上加了@MapperScan,则这里可以不加@Mapper
//@Mapper
public interface UserMapper extends BaseMapper<User> {

}

Service类

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.qq.quickstart.entity.User;
import com.qq.quickstart.mapper.UserMapper;
import org.springframework.stereotype.Service;

@Service
public class UserService extends ServiceImpl<UserMapper, User> {

}

测试

@Test测试

import com.qq.quickstart.entity.User;
import com.qq.quickstart.service.UserService;
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 QuickstartApplicationTests {

	@Autowired
	private UserService userService;

	@Test
	public void test() {
		List<User> list = userService.list();
		System.out.println("有数据:" + list.size() + "条");
		list.forEach(System.out::println);
	}

}

测试结果

控制台打印

有数据:2条
User(id=1, username=admin, password=xxx)
User(id=2, username=test, password=xxx)