SpringBoot整合Mybatis-plus

添加依赖

<dependency>
  <groupId>com.baomidou</groupId>
  <artifactId>mybatis-plus-spring-boot3-starter</artifactId>
  <version>3.5.17</version>
</dependency>

<!-- MySQL -->
<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>8.0.33</version>
</dependency>

<dependency>
  <groupId>org.projectlombok</groupId>
  <artifactId>lombok</artifactId>
  <optional>true</optional>
</dependency>

配置

server:
  servlet:
    context-path: /api
  port: 8080

# DataSource Config
spring:
  application:
    name: happy-pet-server
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/springbootdemo?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true
    username: root
    password: sql102326
  data:
    redis:
      host: localhost
      port: 6379
      password:
      database: 0
      timeout: 5000ms
  servlet:
    multipart:
      max-file-size: 10MB
      max-request-size: 20MB

mybatis-plus:
  mapper-locations: classpath:mapper/**/*.xml

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

@SpringBootApplication
@MapperScan("com.example.springboot.mapper")
public class Application {

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

编码

package com.example.springboot.entity;

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

@Data
@TableName("`user`")
public class User {
    private Long id;
    private String name;
    private Integer age;
    private String email;
}

package com.example.springboot.mapper;

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

@Mapper
public interface UserMapper extends BaseMapper<User> {

}

开始使用

package com.example.springboot;

import com.baomidou.mybatisplus.core.toolkit.Assert;
import com.example.springboot.entity.User;
import com.example.springboot.mapper.UserMapper;
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 ApplicationTests {

    @Autowired
    private UserMapper userMapper;

    @Test
    void contextLoads() {
        System.out.println(("----- selectAll method test ------"));
        List<User> userList = userMapper.selectList(null);
        Assert.isTrue(5 == userList.size(), "");
        userList.forEach(System.out::println);
    }
}

控制台输出

User(id=1, name=Jone, age=18, email=test1@baomidou.com)
User(id=2, name=Jack, age=20, email=test2@baomidou.com)
User(id=3, name=Tom, age=28, email=test3@baomidou.com)
User(id=4, name=Sandy, age=21, email=test4@baomidou.com)
User(id=5, name=Billie, age=24, email=test5@baomidou.com)