Mybatis-plus的使用步骤

Mybatis-plus的简单使用步骤

花开堪折直需折，莫待无花空折枝

导入依赖

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <optional>true</optional>
</dependency>
<!--mybatis-plus-->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.4.1</version>
</dependency>

编写配置文件

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3307/mybatis-plus?serverTimezone=UTC&characterEncoding=utf-8
    username: root
    password: 123456

编写UserMapper继承Mybatis-plus的BaseMapper实现基本的CRUD

• 数据库
  
  

• 用户类

@Data//使用lombok简化代码
public class User {
    @TableId(value = "id",type= IdType.AUTO)
    private int id;
    private String name;
    private int age;
    private String email;
}

• UserMapper,继承BaseMapper，即可使用mybatis-plus自定义的crud方法

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

主启动类加上@MapperScan

@SpringBootApplication
@MapperScan("com.ld.mp.mapper")
public class MpApplication {

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

}

测试

@Autowired
UserMapper userMapper;
@Test
void contextLoads() {
    List<User> users = userMapper.selectList(null);
    users.forEach(user-> System.out.println(user.toString()));
}

结果：