Hibernate / NHibernate：如何将子类作为超类的实例持久化 [英] Hibernate/NHibernate : how to persist subclass as instance of superclass

问题描述

我有两个类，我想通过NHibernate持久化：
- Cat，它有一个名称和一个Id，
- Kitten，它是Cat的子类（没有额外的公共属性）。

出于愚蠢的原因，我想知道是否可以仅映射Cat？所以当我坚持Kitten的时候，它被保存为一个Cat，当我重新加载它时，它被加载为一个Cat。

附加约束：
- 当尝试，NHibernate崩溃，因为它不知道小猫。
- 但是我不想添加歧义值，因为我不想让Hibernate实例化Kitten子类。

非常感谢！ p>

编辑：
我忘了写明确使用ISession.Save（Cat，kitten）。我的问题发生在级联保存期间。

解决方案

老问题，我想我必须改用接口。

I have two classes I would like to persist via NHibernate: - Cat, which has a name and an Id, - Kitten, which is a subclass of Cat (no extra public properties).

For stupid reasons, I would like to know if it is possible to map Cat only? So that when I persist Kitten, it is saved as a Cat and when I reload it, it is loaded as a Cat.

Additional constraints : - When trying, NHibernate crashed because it did not know Kitten. - However I do not want to add a discriminator value, as I do not want Hibernate to instantiate the Kitten subclass.

Thank you very much!

EDIT : I forgot to write that using explicit ISession.Save("Cat", kitten) works. My problem occurs during a cascading save.

解决方案

Old question, I guess I would have to use interfaces instead.

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