Use criteria in a seam action class ?

[giannisapi]

Hi all,

I have made an application using seam-gen . What i  want to do is use hibernate criteria instead of a query. I find it difficult because no matter when I try i cant get it to work.

Below is the method that i want to use criteria in:

 public void queryCars() {

          carsList = new ArrayList<Car>();
           
           EntityManagerImpl entityManagerImpl = (EntityManagerImpl)  entityManager.getDelegate();
             session = entityManagerImpl.getSession();
             Criteria criteria = session.createCriteria(Car.class);
          
          if (make != null) {
               System.out.println("query: " + query);
               criteria.add(Restrictions.eq("brandFK", make));

          }


         
         List<Car> cars= new ArrayList<Car>();;
         carsList.addAll(criteria.list()/*q.getResultList()*/);
         for (Car car : carsList) {
              car.setKivika(1000);
              cars.add(car);
         }

         carsList = new ArrayList<Car>();
         carsList.addAll(cars);
         System.out.println("motorcyclesList size is1 : " + carsList.size());
    }
    

I found this in a tutorial but it does not even compile.

If you could somehow assist me. I know i dont give many infos here(because am lost) but if u can, please help.

Thanks in advance.

Regards,
giannis

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[ralf]

Hey,

i faced the problem too and after some tryouts i found a solution.

Try that:

HibernateSessionProxy proxy = (HibernateSessionProxy) this.entityManager.getDelegate();
Criteria criteria = proxy.createCriteria( MyClass.class );

Does it work??

Ralf

[gonorrhea]

Seam in Action:

When you’re using JPA, you can always get down to the provider interface by calling
the getDelegate() method on the EntityManager instance. But you have to perform
a cast that makes an assumption about the underlying JPA provider:

Session session = (Session) entityManager.getDelegate();

You can define a factory in Seam to hide the cast:

<factory name="hibernateSession" value="#{entityManager.delegate}"
auto-create="true"/>

You then use the @In annotation to inject the value of this factory into your component:

@In private Session hibernateSession;

[giannisapi]

Hi all,

First of all thanks for the replies.

Sorry for the late post but my pc motherboard burnt out so i had to replace it...

The proxy thing seems to be working for me. But this:

'<facory name="hibernateSession" value="#{entityManager.delegate}"
auto-create="true"/>
'

I dont really understand it . So i will have to use sessionproxy.

just one more question. Performance wise, which of the two sollutions iis better?

Regards,
gianis