java 如何用Spring Data JPA管理多个List集合双方的关系

ecbunoof  于 2023-01-04  发布在  Java
关注(0)|答案(1)|浏览(169)

Stack java 11 springboot 2.7我不能,创建了一个有多重关系的实体模式,我有几个错误,我不能摆脱它我不,最好的错误是什么?
用户实体应仅将此数据保存到备份
Address实体应仅保存此数据,并级联有关保存的委托,并且引用ID永远不会更改。

@Data
@NoArgsConstructor
@AllArgsConstructor
@Entity
@Table(...)
@EntityListeners(AuditingEntityListener.class)
@Builder
public class AdressMSSEntity {

    @Id
    @Column(name = "...")
    private String adress;

    @ManyToOne(optional = false)
    @JoinColumn(name = "...")
    private UserEntity useEntity;

    @OneToMany(fetch = FetchType.EAGER, mappedBy = "adress", cascade = CascadeType.ALL, orphanRemoval = true)
    private List<DelegueEntity> delegueEntities;

    @OneToMany(fetch = FetchType.EAGER, mappedBy = "adressDelegue")
    private List<DelegueEntity> delegationRecues;

}

@Data
@AllArgsConstructor
@Entity
@Table(name = "...")
@EntityListeners(AuditingEntityListener.class)
@Builder
@NoArgsConstructor
public class DelegueEntity {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "...")
    private Integer id;

    @ManyToOne
    @JoinColumn(name = "...")
    private AdressEntity adress;

    @ManyToOne
    @JoinColumn(name = "...")
    private AdressEntity adressDelegue;

}

@Data
@NoArgsConstructor
@AllArgsConstructor
@Entity
@Table(...)
@EntityListeners(AuditingEntityListener.class)
@Builder
public class UserEntity {

    @Id
    @Column(name = "...")
    private String idTech;

    @OneToMany(fetch = FetchType.EAGER)
    @Cascade({PERSIST, MERGE, REMOVE, REFRESH, DETACH})
    private List<AdressEntity> listAdressEntity;

}



@Repository
@Transactional
@PersistenceContext
public interface IAdressRepositoryJpa extends JpaRepository<AdressEntity, String> {
    Page<AdressEntity> findByAdressContaining(String adress, Pageable pageable);

    Page<AdressEntity> findByUserEntityIdTechContaining(String idTech, Pageable pageable);

    Page<AdressEntity> findByUserEntityContainingAndAdressContaining(String adress, String idTech,
                                                                                     Pageable pageable);

    @Query("select distinct a  from AdressEntity a left join DelegueEntity d.adress where a.adress "
            + "= :adress.adress")
    List<AdressEntity> findAllDelegueEntitiesAdressByAdressEntity(
            @Param("adress") AdressEntity adress);

    @Query("select distinct a  from AdressEntity a left join DelegueEntity d.adressDelegue = :adress.adress")
    List<AdressEntity> findAllDelegationsRecuesAdressDelegueByAdressEntity(
            @Param("adress") AdressEntity adress);

    @Query("select distinct a  from AdressEntity a left join UserEntity i.idTech = :adress.adress")
    List<AdressEntity> findAllUserEntityIdTechByAdressEntity(
            @Param("adress") AdressEntity adress);

}
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlserverEntityManager' defined in class path resource [.../PersistenceSqlserverAutoConfiguration.class]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory; nested exception is org.hibernate.loader.MultipleBagFetchException: cannot simultaneously fetch multiple bags: [....UserEntity.listAdressEntity, ....AdressEntity.delegationRecues]
ryevplcw

ryevplcw1#

要在两个实体之间建立双向关系,你需要使用@ManyToMany注解。这里有一篇很好的文章解释了如何做到这一点:Many-To-Many Relationship in JPA

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