java - 实体更新导致错误：拥有实体不再引用 cascade="all-delete-orphan"

Question

我有以下表格实体，因为我正在尝试更新现有记录，但这样做时出现以下错误。我知道我在实体定义中犯了一些错误，但无法弄清楚。感谢你的帮助。

                **A
        -------------------
        |                 |
        B                 C
                      ---------
                      |       |
                      D       E**

@Entity
@Table()
public class A {
    @Id
    Long id;

    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, orphanRemoval=true)
    @JoinColumn(name = "id", referencedColumnName="id",  nullable = false)
    private Set<B> b;

    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, orphanRemoval=true)
    @JoinColumn(name = "id", referencedColumnName="ID",  nullable = false)  
    private Set<C> c;
}

@Entity
@Table()
public class B{
    @Id
    Long id;
}

@Entity
@Table()
public class C{
    @Id
    Long id;
    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, orphanRemoval=true)
    @JoinColumn(name = "id", referencedColumnName="id",  nullable = false)
    private Set<D> D;

    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, orphanRemoval=true)
    @JoinColumn(name = "id", referencedColumnName="ID",  nullable = false)  
    private Set<E> E;
}

@Entity
@Table()
public class D{
    @Id
    Long id;
}

@Entity
@Table()
public class E{
    @Id
    Long id;
}

错误：

org.hibernate.HibernateException：拥有的实体实例不再引用具有 cascade="all-delete-orphan" 的集合：com.entity.CD

at org.hibernate.engine.internal.Collections.processDereferencedCollection(Collections.java:100) ~[hibernate-core-5.3.12.Final.jar:5.3.12.Final]
at org.hibernate.engine.internal.Collections.processUnreachableCollection(Collections.java:51) ~[hibernate-core-5.3.12.Final.jar:5.3.12.Final]
at org.hibernate.event.internal.AbstractFlushingEventListener.flushCollections(AbstractFlushingEventListener.java:262) ~[hibernate-core-5.3.12.Final.jar:5.3.12.Final]
at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:95) ~[hibernate-core-5.3.12.Final.jar:5.3.12.Final]

标签： javahibernatespring-bootspring-data-jpahibernate-5.x

Answer 1

映射取决于关联的所有权，考虑到您的示例，很难指出，但您可以查看这篇文章以更好地理解使用一种或另一种方法以及数据库中的后果。我不知道您的更新是否是这种情况，但是当您更新孩子时，您需要清除过去的集合并使用 addAll 方法来避免此类错误。也检查这个帖子。