java - Spring Hibernate 发现了不止一行具有给定外键的行

Question

我在使用 JPA 存储库的 findByProfileId() 方法时遇到问题

这是我数据库中的示例条目(行)。

当我尝试通过 REST ( http://localhost:8080/rest/test/21234 ) 请求时，其中 21234 是上表中的 profile_id。

这是我的 REST 服务。

@RequestMapping(path="/{id}", method = RequestMethod.GET)
public ResponseEntity<?> get(@PathVariable Long id){
    try {
        logger.info("get({})",id);
        logger.info("get({})",Lists.transform(wishlistService.get(id), toRestWishlist));
        return new ResponseEntity<>(Lists.transform(wishlistService.get(id), toRestWishlist), HttpStatus.OK);
    } catch (Exception e) {
        // TODO: handle exception
        logger.error("{}",e.getMessage());
        return new ResponseEntity<>(e.getMessage(), HttpStatus.BAD_REQUEST);
    }
}

这是WishlistServiceImpl

@Override
public List<Wishlist> get(Long id) {
    // TODO Auto-generated method stub
    return repo.findByProfileId(id);
}

这是存储库

@Repository
public interface WishlistRepository extends JpaRepository<Wishlist, Long> {

    List<Wishlist> findByProfileId(Long id);

}

这是我的愿望 list 实体

@Entity
@Table(name = "wishlist")
public class Wishlist {

    @Id
    @GeneratedValue
    @Column(name="wish_Id")
    private Long wishId;

    @OneToOne(cascade= CascadeType.DETACH)
    @JoinColumn(name = "profile_id")
    private Profile profile;

    @OneToMany(
        mappedBy = "wishlist", 
        cascade = CascadeType.DETACH, 
        orphanRemoval = true
    )
    private List<Comment> comments;

    @NotNull
    @Column(name="description")
    private String description;

    @NotNull
    @Column(name="images")
    private String images;

    @Column(name="created_at")
    private Long createAt;

    @Column(name="updated_at")
    private Long updatedAt;

    /* Getters and Setters and toString() */

}

每次发送请求时，我都会在日志中收到此错误

2017-12-08 14:15:54.854  INFO 2620 --- [nio-8080-exec-2] c.s.s.web.controller.WishlistController  : get(21234)
2017-12-08 14:15:54.858  INFO 2620 --- [nio-8080-exec-2] o.h.e.internal.DefaultLoadEventListener  : HHH000327: Error performing load command : org.hibernate.HibernateException: More than one row with the given identifier was found: 21234, for class: com.secret.santa.core.models.Wishlist
2017-12-08 14:15:54.858 ERROR 2620 --- [nio-8080-exec-2] c.s.s.web.controller.WishlistController  : More than one row with the given identifier was found: 21234, for class: com.secret.santa.core.models.Wishlist; nested exception is org.hibernate.HibernateException: More than one row with the given identifier was found: 21234, for class: com.secret.santa.core.models.Wishlist

Answer 1

将Repository中的方法签名声明为:

List<Wishlist> findAllByProfile(Profile profile);

并且您必须传递类似 new Profile(profileId) 的内容。

此外，您可能需要将字段 Profile 中的 @OneToOne 注释更改为 @ManyToOne。