与 XML 映射文件等效的 Hibernate @embeddable 注释? [英] Hibernate @embeddable annotation equivalent for XML mapping file?

问题描述

我有一个类，我正在创建一个 Hibernate 映射，其中包含一个我无法修改的遗留对象，因此它没有必要的 id 字段来很好地与 Hibernate 配合使用.我想将遗留对象注释为我的新类的 @Embedded 字段，并为遗留对象编写一个 hbm.xml 文件，并注意它是可嵌入的.有没有办法做到这一点?我见过的唯一关于嵌入对象的文档是指注释对象而不是使用 XML.

I have a class that I am creating a Hibernate mapping which contains a legacy object that I can't modify, so it doesn't have the necessary id field to play nicely with Hibernate. I would like to annotate the legacy object as an @Embedded field of my new class and write an hbm.xml file for the legacy object and note that it is embeddable. Is there a way to do this? The only documentation for embedding objects I've seen refers to annotating objects instead of using XML.

我意识到我可以扩展遗留对象并对其进行适当的注释，但这些情况可能会经常发生，所以我想尽可能避免这种情况.

I realize that I could extend the legacy object and annotate it appropriately, but these case might occur frequently so I'd like to avoid that if possible.

推荐答案

@Embedded 的 XML 对应物是 ，见 5.1.5.嵌入对象(又名组件).

The XML counterpart of @Embedded is <component>, see 5.1.5. Embedded objects (aka components).

但是，它与@Embeddable/@Embedded 对的工作方式不同，您需要在 中描述组件类的所有属性.hbm.xml 包含类，类似这样:

However, it doesn't work the same way as the @Embeddable/@Embedded pair, you need to describe all properties of the component class in .hbm.xml of the containing class, something like this:

<class name = "NewClass">
    ...
    <component name = "legacyObject">
        ... properties of the legacy class ...
    </component>
</class>

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