使用 spring boot、crud 存储库、hibernate 和 postgres 使用非自动生成的 id 级联父子

Question

当我尝试使用特定 ID（非自动生成）保存一些相关实体时，我遇到了 crudRepository（Spring boot-hibernate-postgres）和级联问题。 我花了一些时间谷歌搜索但没有成功。

这是方法：

  private String importSourceInfo() {
    SourceCompany sourceCompany= new SourceCompany();
    sourceCompany.setName("companyName");
    sourceCompany.setId(UUID.fromString("2bf05cbc-d530-11eb-b8bc-0242ac130003"));
    Set<SourceUser> sourceUsers = new HashSet<>();

    SourceUser sourceUser= new SourceUser();
    sourceUser.setName("dev-team");
    sourceUser.setId(UUID.fromString("4bede7a0-d530-11eb-b8bc-0242ac130003"));
    sourceUser.setCompany(sourceCompany);

    sourceUsers.add(sourceUser);
    sourceCompany.setUsers(sourceUsers);

    SourceInfo sourceInfo= new SourceInfo();
    sourceInfo.setSourceUser(sourceUser);
    sourceInfo.setSourceCompany(sourceCompany);
    sourceInfo.setId(UUID.fromString("74a52aa0-d530-11eb-b8bc-0242ac130003"));
    sourceInfo.setVersion("v1");
    sourceInfo.setDescription("company v1");

    sourceInfoRepository.save(sourceInfo);
    return "SourceInfo has been imported!";
}

这些是模型：

来源信息：

@Data
@Entity
@EqualsAndHashCode(onlyExplicitlyIncluded = true)
@Table(name = "source_info")
public class SourceInfo {

    @Id
    @EqualsAndHashCode.Include
    private UUID id;

    @ManyToOne(cascade=CascadeType.PERSIST)
    @JoinColumn(name = "fk_source_user", referencedColumnName = "id")
    private SourceUser sourceUser;

    @ManyToOne(cascade=CascadeType.PERSIST)
    @JoinColumn(name = "fk_source_company", referencedColumnName = "id")
    private SourceCompany sourceCompany;

    @Column(columnDefinition = "text")
    private String description;

    private String version;
}

来源公司：

@Data
@Entity
@EqualsAndHashCode(onlyExplicitlyIncluded = true)
@Table(name = "source_company")
public class SourceCompany {
    @Id
    @EqualsAndHashCode.Include
    private UUID id;

    private String name;

    @OneToMany(cascade = CascadeType.PERSIST, mappedBy = "company")
    private Set<SourceUser> users;

}

来源用户：

@Data
@Entity
@EqualsAndHashCode(onlyExplicitlyIncluded = true)
@Table(name = "source_user")
public class SourceUser {
    @Id
    @EqualsAndHashCode.Include
    private UUID id;

    private String name;

    //ref
    @ManyToOne
    @JoinColumn(name = "fk_source_company")
    private SourceCompany company;
}

这是错误：

javax.persistence.EntityNotFoundException: Unable to find xxx.sp_model.sustainability.model.utils.SourceCompany with id 2bf05cbc-d530-11eb-b8bc-0242ac130003
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$JpaEntityNotFoundDelegate.handleEntityNotFound(EntityManagerFactoryBuilderImpl.java:163) ~[hibernate-core-5.4.27.Final.jar!/:5.4.27.Final]
at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:216) ~[hibernate-core-5.4.27.Final.jar!/:5.4.27.Final]
at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:332) ~[hibernate-core-5.4.27.Final.jar!/:5.4.27.Final]
at org.hibernate.event.internal.DefaultLoadEventListener.doOnLoad(DefaultLoadEventListener.java:108) ~[hibernate-core-5.4.27.Final.jar!/:5.4.27.Final]
at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:74) ~[hibernate-core-5.4.27.Final.jar!/:5.4.27.Final]
at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:113) ~[hibernate-core-5.4.27.Final.jar!/:5.4.27.Final]
at org.hibernate.internal.SessionImpl.fireLoadNoChecks(SessionImpl.java:1186) ~[hibernate-core-5.4.27.Final.jar!/:5.4.27.Final]
at org.hibernate.internal.SessionImpl.internalLoad(SessionImpl.java:1051) ~[hibernate-core-5.4.27.Final.jar!/:5.4.27.Final]
at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:697) ~[hibernate-core-5.4.27.Final.jar!/:5.4.27.Final]

我认为 hibernate 想要更新子 sourceCompany 而不是保存它（如果是新的）。但我不知道如何解决它。 （我还需要以更复杂的结构扩展最终解决方案，所以我需要一个通用解决方案，因为原则上应用程序的 id 是自动生成的并且一切正常，现在需要在后端设置这些 ID 以便保存特定的 ID。）

Answer 1

我认为您遇到了 Spring Data JPA 存储库无法检测是否调用 EntityManager.persist 与 EntityManager.merge 的限制。您需要致电EntityManager.persist 来完成这项工作。