使用Hibernate Criteria API检索嵌入式或组件 [英] Retrieve emebedded or component using Hibernate Criteria api

问题描述

我把这个类映射为一个实体，我们称它为Person。 Person与Address有嵌入式/组件关系。我无法使用将返回地址对象的条件。
我试过这个：

$ p $ Criteria.createCriteria（Address.class）


哪个不行。我想我需要通过实体，但是我需要某种投影？

  Criteria.createCriteria（Person.class ）。<<这里是什么???>> 
  

建议？

解决方案

组件的生命周期由其所有者控制;他们不被视为协会。因此，您无法从查询中自行检索组件。您可以在标准中使用它。

假设您的Address类在Person中映射为address，您可以执行下列操作： p>

  Criteria.createCriteria（Person.class）
 .add（Restrictions.eq（address.street，street）） ; 
  

I have this class mapped as a entity, lets call it Person. Person has an embedded/component relation to Address. I am having trouble using a Criteria that would return Address objects. I have tried this:

Criteria.createCriteria(Address.class)

Which does not work. I guess I need to go through the entity but then I would need some kind of projection?

Criteria.createCriteria(Person.class).<<what goes here???>>

Suggestions?

解决方案

Component's lifetime is controlled by its owner; they are NOT considered associations. You therefore cannot retrieve component by itself from a query. You can, however, use it in criteria.

Assuming your "Address" class is mapped as "address" within "Person", you could do something like:

Criteria.createCriteria(Person.class)
 .add(Restrictions.eq("address.street", street));

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