spring-boot-starter-data-mongodb操纵MongoDB入门

spring-boot-starter-data-mongodb操纵MongoDB入门

1.引入依赖

<dependency>
	<groupId>org.springframework.bootgroupId>
	<artifactId>spring-boot-starter-data-mongodbartifactId>
dependency>

application.yml引入依赖

spring:
  data:
    mongodb:
      host: 127.0.0.1
      port: 27017 
      database: students 

2.实体类

/**
 * @Author 编程无忧
 * @Date 2022/1/27 11:32
 * @Desc MongoDB实体类 学生集合
 */

@Data 
@AllArgsConstructor 
@NoArgsConstructor 

//java实体类映射
@Document("students")

public class Students implements Serializable {
    @Id
    private String _id;

    private String id;
    private String name;
    private Integer age;
}

3.Dao层

/**
 * @Author [email protected]
 * @Date 2022/1/27 12:42
 * @Desc
 */
public interface StudentsDao extends MongoRepository<Students,String>{
}

4.service

/**
 * @Author [email protected]
 * @Date 2022/1/27 12:44
 * @Desc
 */
public interface StudentsService {
    List<Students> findAll();

    Students findById(String id);
}

5.实现类

/**
 * @Author [email protected]
 * @Date 2022/1/27 12:45
 * @Desc
 */
@Service
public class StudentsServiceImpl implements StudentsService {
    @Autowired
    private StudentsDao studentsDao;

    /**
     * @return
     */
    @Override
    public List<Students> findAll() {
        return studentsDao.findAll();
    }

    /**
     * @return
     */
    @Override
    public Students findById(String id) {
        return studentsDao.findById(id).get();
    }
}

6.Controller控制层

/**
 * @Author [email protected]
 * @Date 2022/1/27 12:46
 * @Desc
 */
@RestController
@CrossOrigin
@RequestMapping("/students")
public class StudentController {
    @Autowired
    private StudentsService studentsService;

    @GetMapping
    public Result findAll(){
        System.out.println("-----------------------------");
        List<Students> list = studentsService.findAll();
        for (Students comment : list) {
            System.out.println(comment);
        }
        System.out.println("------------------------------"+list.size());
        return new Result(true, StatusCode.OK,list);
    }

    @GetMapping(value = "/{id}")
    public Result<Students> findById(@PathVariable String id){
        Students student = studentsService.findById(id);
        return new Result(true, StatusCode.OK,student);
    }
}

7.结果

以及全局异常拦截：​