休眠覆盖@transient [英] Hibernate override @transient

问题描述

我有一个映射的超类，它有一个字段，我的数据库中的一些表共享。

我希望用@Transient来注释这个字段，所以大多数实体都会忽略它，但是de- @ Transient或Un- @ Transient它在子实体上。

这可能吗？

谢谢，
Idob

解决方案

您可以使用鉴别符模式

http://docs.jboss.org/hibernate/orm/3.3/reference/en-US/html/ mapping.html

您必须设置父级超类，然后对其进行子类化，如

  ClassWithSharedFields 
 ClassExtensionThatUpdatesCertainFields 
 ClassExtensionThatReadsCertainFields 
  

然后， ClassExtensionThatReadsCertainFields 可以将您不打算更新的字段指定为只读。

这可能有点含糊不清，因此如果您想要更具体的帮助，可以提供一些更具体的例子，说明您的域类需要与您的关系DB。

I have a mapped super class, which has a field that some of the tables in my DB share.

I wish to annotate this field with @Transient so most entities will ignore it, but de-@Transient or un-@Transient it on child entities.

Is this possible?

Thank you, Idob

解决方案

You might be able to use the discriminator pattern

http://docs.jboss.org/hibernate/orm/3.3/reference/en-US/html/mapping.html

You would have to set up a parent super class and then sub-class it, something like

ClassWithSharedFields
ClassExtensionThatUpdatesCertainFields
ClassExtensionThatReadsCertainFields

Then, ClassExtensionThatReadsCertainFields could specify the field that you don't intend on updating as read only.

This might be a bit of a vague suggestion, so if you want more specific help maybe provide some more concrete examples of how your domain classes need to behave in relationship to your DB.

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