休眠集合未在子代移动时更新 [英] Hibernate collection not updated on child move

问题描述

我继承了休眠映射，无法将子节点从一个父节点移动到另一个父节点.我得到重复的引用，或者得到一个错误.

I'm inherited a hibernate mapping and am having trouble moving a child node from one parent node to another. Either I get a duplicate reference, or I get an error.

我在树上有位置.我想将一个叶子节点移动到另一个叶子位置.在代码中，我试图这样做:

I have locations in a tree. I want to move one leaf node to another leaf position. In code I'm trying to do this:

GeographicLocation oldParent = location.getParent();
location.setParent(newParent);
newParent.getChildren().add(location);
oldParent.getChildren().remove(location);

原因:

org.hibernate.ObjectDeletedException: deleted object would be re-saved by cascade (remove deleted object from associations): [com.test.GeographicLocation#11]

如果我删除行oldParent.getChildren().remove(location)，则newParent节点正确指向子级，但是oldParent仍然还有对子级的引用(！).

If I remove the line oldParent.getChildren().remove(location), the newParent node correctly points to the child, but the oldParent still has a reference to the child as well(!).

休眠配置文件中的代码段

Snippets from hibernate config file:

<class name="GeographicLocation" table="GeographicLocation">
  <id column="GeographicLocationId" name="geographicLocationId" type="java.lang.Long">
    <generator class="native">
      <param name="sequence">GeographicLocationId</param>
    </generator>
  </id>

<many-to-one class="com.test.GeographicLocation"
   foreign-key="ParentFK" name="parent">
  <column name="parent"/>
</many-to-one>

<bag cascade="all,delete-orphan" inverse="true" lazy="false" name="children">
  <key column="parent" not-null="true"/>
  <one-to-many class="com.test.GeographicLocation"/>
</bag>

我使用Hibernate的时间不长.我的理解是，作为受管理对象的location节点在修改后会自行保存.由于休眠配置文件指定了cascade=all，因此对集合的更改也会将更改保存到子级.但是，我似乎找不到删除旧参考文献的合法方法.有帮助吗?

I haven't been using Hibernate very long. My understanding is that the location node, being a managed object, will save itself when modified. Since the hibernate config file specifies cascade=all changes to the collection will also save changes to the child. However, I can't seem to find a legal way to remove the old reference. Any help?

推荐答案

我将从映射中删除delete-orphan，因为它说一旦从集合中删除元素，就应将其删除(即显然不是您想要的).

I would remove the delete-orphan from the mapping, since it says that as soon as you remove an element from the collection, it should be removed (which is clearly not what you want).

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