问题描述
我试图在 Spring Boot 上使用 Spring Data JPA 并且我不断收到错误，我无法弄清楚问题是什么:
I was trying to use Spring Data JPA on Spring Boot and I kept getting error, I can't figure out what the problem is:
无法找到具有给定名称 [firstName] 的属性这个 ManagedType [com.example.h2demo.domain.Subscriber]
FirstName 在我的实体类中声明.我之前在不同的项目中使用过一个带有 DAO 的服务类并且工作得很好.
FirstName is declared in my entity class. I have used a service class with DAO before with different project and worked perfectly.
我的实体类(getter 和 setter 也在类中):
My Entity class (getters and setters are also in the class) :
@Entity
public class Subscriber {
@Id @GeneratedValue
private long id;
private String FirstName,LastName,Email;
public Subscriber(long id, String firstName, String lastName, String email) {
this.id = id;
this.FirstName = firstName;
this.LastName = lastName;
this.Email = email;
}
}
...
我的存储库类
@Component
public interface SubscriberRepository extends JpaRepository<Subscriber,Long> {
Subscriber findByFirstName(String FirstName);
Subscriber deleteAllByFirstName(String FirstName);
}
我的服务类
@Service
public class SubscriberService {
@Autowired
private SubscriberRepository subscriberRepository;
public Subscriber findByFirstName(String name){
return subscriberRepository.findByFirstName(name);
}
public Subscriber deleteAllByFirstName(String name){
return subscriberRepository.deleteAllByFirstName(name);
}
public void addSubscriber(Subscriber student) {
subscriberRepository.save(student);
}
}
和我的控制器类:
@RestController
@RequestMapping("/subscribers")
public class SubscriberController {
@Autowired
private SubscriberService subscriberService;
@GetMapping(value = "/{name}")
public Subscriber findByFirstName(@PathVariable("name") String fname){
return subscriberService.findByFirstName(fname);
}
@PostMapping( value = "/add")
public String insertStudent(@RequestBody final Subscriber subscriber){
subscriberService.addSubscriber(subscriber);
return "Done";
}
}
推荐答案
尝试将 private String FirstName,LastName,Email; 更改为 private String firstName,lastName,email;
它应该可以工作.
findByFirstName 尝试按照约定查找不存在的字段 firstName.
findByFirstName in SubscriberRepository tries to find a field firstName by convention which is not there.
关于如何遍历实体内部的属性的进一步参考 https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#repositories.query-methods.query-property-expressions
Further reference on how properties inside the entities are traversed https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#repositories.query-methods.query-property-expressions
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