如何在Hibernate中将元素添加到延迟加载的集合而不会导致集合加载？ [英] How can I add an element to a lazily-loaded collection in Hibernate without causing the collection to load?

问题描述

它在锡上说的是什么;我想修改Hibernate中的一个集合而不强制加载集合，因为它是一个大量的数据（大约100,000条记录，单调递增）。

What it says on the tin; I want to modify a collection in Hibernate without forcing the collection to load, since it is a large volume of data (~100,000 records, monotonically increasing).

现在，我通过调用 getEvents（）.add（newEvent）来添加一个元素到这个列表中，这当然会导致 events

Right now, I add an element to this list by calling getEvents ().add (newEvent) which, of course, causes events to be populated.

以下是贴图：

Here's the mapping:

<bag name = "events" inverse = "true" cascade = "all-delete-orphan"
 order-by = "event_date desc" lazy = "true">
  <key>
<column name = "document_id" length = "64" not-null = "true" />
  </key>
  <one-to-many class = "EventValue" />
</bag>

我应该怎么做？

How should I be doing this?

推荐答案

完成此操作的一种方法是在父对象（让我们将其称为Parent）和事件之间创建双向关联，并配置您的hibernate映射，以使关系由Event管理。

One way to accomplish this would be to create a bidirectional association between the parent object (let's call it Parent) and the Event and configure your hibernate mappings such that the relationship is managed by Event.

为了达到这个目的，你的Hibernate映射看起来像这样：

To accomplish this, your Hibernate mappings would look something like:

<class name="Parent"...>
    ...
    <bag name="events" lazy="true" inverse="true"...>...</bag>
    ...
</class>

<class name="Event"...> 
    <many-to-one name="parent">
    ...
</class>

您的代码看起来像这样：

And your code would look something:

myEvent.setParent(parentObject);
eventDao.save(myEvent);

希望这会有所帮助。祝你好运。

Hope this helps. Good luck.

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