Hibernate的细节处理（三）-优快云博客

本文介绍了Hibernate框架中关于标识属性的功能，如传递性重新附加、Session.saveOrUpdate()等，并强调了为了充分利用Hibernate特性（如懒加载），持久化类应避免声明为final及包含public final方法的重要性。

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In fact, some functionality is available only to classes which declare an identifier property: • Transitive reattachment for detached objects (cascade update or cascade merge) - see Section 10.11, “Transitive persistence” • Session.saveOrUpdate() • Session.merge()
 虽然hibernate并不要求每一个要被持久化的对象都有一个id标识，但是有一些方法只对有id标识的对象有效。

A central feature of Hibernate, proxies, depends upon the persistent class being either non-final, or the implementation of an interface that declares all public methods. You can persist final classes that do not implement an interface with Hibernate, but you won't be able to use proxies for lazy association fetching - which will limit your options for performance tuning. You should also avoid declaring public final methods on the non-final classes. If you want to use a class with a public final method, you must explicitly disable proxying by setting lazy="false".

为了使用hibernate的一些核心特性（例如懒加载），尽量将要被持久化的类设置成非final的，并且要确保持久化类实现的interface不要含有非public的方法。 If you want to use a class with a public final method, you must explicitly disable proxying by setting lazy="false".