How can I retrieve a collection property using criteria Api

问题

I want to retrieve a collection property using criteria

   public class A {  
       private Collection<B> property  
       // getters and setters
   }  
   public class B {
      private int status
      // getters and setters
   }

My criteria code is as follows:

Criteria cr = getSession().createCriteria(A.class)     
cr.createAlias("property", "prop")
cr.add(Restrictions.eq("prop.status", status));
cr.setProjection(Projections.property("prop"));
cr.list();

It's obvious this code doesn't work I wanted to simply demonstrate my intentions. I know how to achieve this using HQL, but I have to use Criteria API. Is what I am aiming for even possible using Criteria ?

回答1:

What wrong with this solution ?

Criteria cr = getSession().createCriteria(B.class);
 cr.add(Restrictions.eq("status", status));
 cr.list(); 

回答2:

Unfortunately what I want to achieve is not possible with Hibernate Criteria. If someone needs something like that you should create a namedQuery , as awfull as that migh be to you or just use hql.

Peter

来源：https://stackoverflow.com/questions/3608220/how-can-i-retrieve-a-collection-property-using-criteria-api