MyBatisPlus 基础数据表的增删改查入门简单查询

MyBatisPlus

MyBatisPlus（简称MP）是一个基于MyBatis的增强工具库，简化了MyBatis的开发，提供了很多实用的功能和特性，如自动生成SQL、通用CRUD操作、分页插件、条件构造器、代码生成器等。它不仅简化了开发过程，还提高了开发效率，使得开发者能够更专注于业务逻辑的实现而非繁琐的SQL操作。MyBatisPlus广泛应用于Java项目中，尤其是基于MyBatis的数据库访问层开发。

依赖

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

扫描Mapper

@SpringBootApplication
@MapperScan("com.mybatis.mybatisplusdemo.mapper")  //扫描mapper
public class MyBatisPlusDemoApplication {public static void main(String[] args) {SpringApplication.run(MyBatisPlusDemoApplication.class, args);}
}

数据表

在这里插入图片描述

实体类

@Data
@TableName("employee_235") //映射的表名
public class Emp {private  int id;private  String name;private  String tele;private  char gender;private Date birthday;private  float salary;private  String post;private  int depNo;
}

Mapper接口

@Mapper
public interface EmpMapper extends BaseMapper<Emp> { }

Controller

@RestController
@RequestMapping("/emp")
public class EmpController {@Autowiredprivate EmpMapper empMapper ;@GetMapping("/list")public Result getEmpList(){List<Emp> list= empMapper.selectList(null);return  Result.success("获取成功",list);}
}

{"code":200,"meg":"获取成功","data":[{"id":2024021,"name":"王德法","tele":"1335645465","gender":"男","birthday":"2024-03-21T16:00:00.000+00:00","salary":7544.0,"post":"审核员","depNo":1},{"id":2024091,"name":"张大炮","tele":"13333354634","gender":"男","birthday":"2024-03-22T16:00:00.000+00:00","salary":7557.0,"post":"审核员","depNo":2},{"id":2024101,"name":"李二牛","tele":"13354676765","gender":"男","birthday":"2024-03-23T16:00:00.000+00:00","salary":4574.0,"post":"审核员","depNo":3},{"id":2024185,"name":"张三凤","tele":"13354654543","gender":"男","birthday":"2024-03-20T16:00:00.000+00:00","salary":5201.0,"post":"审核员","depNo":3}]}