他 return null，来自我的存储库，具有 UUID，主 ID

Question

我有一个这样的实体，带有 uuid pk 密钥...

package com.bonrefil_rest_api.bonrefil_rest_api.data.entity;

import lombok.*;
import org.hibernate.annotations.GenericGenerator;
import org.hibernate.annotations.NotFound;
import org.hibernate.annotations.NotFoundAction;

import javax.persistence.*;
import java.util.*;

@Entity
@Table(name = "annonce")
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class Annonce {
    @Id
    @GeneratedValue(generator = "UUID")
    @GenericGenerator(name = "UUID", strategy = "org.hibernate.id.UUIDGenerator")
    @Column(length = 16, name = "annonce_id", nullable = false, updatable = false)
    private UUID annonce_id;

    @Column(nullable = false)
    private String name;

    @Column(nullable = false)
    private String title;

    @Column(nullable = false)
    private String description;

    @Column(nullable = false)
    private double price;

    @Column(nullable = false)
    private int quantity;

    @Column(nullable = false)
    private String salesTerms;

    @JoinColumn(name = "author_client_id")
    private UUID author;

    @OneToOne(mappedBy = "annonce", optional = false)
    private AnnoncePicture picture;

    @ManyToMany
    @JoinTable(name = "annonce_carts",
            joinColumns = @JoinColumn(name = "annonce_id"),
            inverseJoinColumns = @JoinColumn(name = "cart_id"))
    private List<Cart> cartList = new ArrayList<>();

    @OneToMany(mappedBy = "conversationOnAnnonce")
    private Collection<Conversation> conversationList = new ArrayList<>();

    @ManyToMany(mappedBy = "annonceList")
    private List<Categorie> categorieList = new ArrayList<>();

    @Enumerated
    @ElementCollection(fetch = FetchType.LAZY)
    private List<State> states;

    @OneToMany(mappedBy = "noteFor")
    private Collection<Note> noteList;

    @Temporal(TemporalType.TIMESTAMP)
    @Column(name = "createdAt", insertable = false, columnDefinition = "DATETIME DEFAULT NOW()")
    private Date createdAt;
    @Column(name = "updateAt", nullable = true, columnDefinition = "DATETIME")
    private Date updateAt;

    @Column(nullable = false)
    private String categorie;

}

我有一个这样的存储库

@RepositoryRestResource
public interface AnnonceRepository extends JpaRepository<Annonce, UUID> {
    List<Annonce> getAllByCategorie(String categorie);
    List<Annonce> findAnnonceByAuthor(Client author);
}

一个控制器用于检索一个 uuid 像这样的 annonce

 @GetMapping("/{annonce_id}")
    public ResponseEntity<Optional<AnnonceDTO>> getOne(@PathVariable UUID annonce_id){
        return ResponseEntity.ok(annonceService.getOne(annonce_id));
    }

以及

的服务

@Override
    public Optional<AnnonceDTO> getOne(UUID annonceId) {
        if (!annonceRepository.existsById(annonceId))
            throw new ElementNotFoundException();

        return annonceRepository.findById(annonceId).map(annonceMapper::toDTO);

    }

我试试邮递员

http://localhost:8080/annonce/0e7b4f11-b7eb-4c83-83e3-d08955ddd7ae

但是 return 为空，并且该行在我的 mysql 数据库中...

我没有错误，只是为空，我一直在寻找原因，但我没有找到，但还有一些事情要知道？...使用 UUID？...我已经看到了在我的数据库上，该行是 blob，我在数据库上尝试 select，这只适用于 unhex，但是在 spring 上，UUID 是 fonctionnaly inside ?..

有人可以帮助我，

非常感谢?..

这里也是mysql

Answer 1

我找到了在存储库上查询的解决方案....

@Query("SELECT CASE WHEN COUNT(a) > 0 THEN true ELSE false END FROM Annonce a WHERE a.annonce_id = :annonceId")     
Boolean ifExistByUuid(@Param("annonceId") UUID annonce_id);    
@Query("SELECT a FROM Annonce a WHERE a.annonce_id= ?1")     
Annonce findOneByUuid(UUID annonce_id);

非常感谢您的帮助....工作正常....

他 return null，来自我的存储库，具有 UUID，主 ID

He return null, from my repository with UUID, primary id

java

uuid

spring

hibernate