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Groups > comp.lang.java.help > #1024

Re: CriteriaQuery and JPA

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Il 07/09/2011 20:02, Lew ha scritto:
> Read the Javadocs for 'Root#get(String attributeName)'.  You gave a 'null' attribute name, and what you tried to do wasn't giving an attribute *name*, but an attribute *value*.

UPDATE.
It's not the where clause causing problem... Infact even without where 
clause the result is always empty.
I try with this code:

CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder();
CriteriaQuery filter = criteriaBuilder.createQuery(MyClass.class);
Root<MyClass> from = filter.from(MyClass.class);
filter.select(from);
TypedQuery<MyClass> q = entityManager.createQuery(filter);	
List<MyClass> results = q.getResultList();

The resulting query is :
Hibernate: select myclass0_.username as username4_ from MYCLASS myclass0_

I tried with Query too:
String sQuery = "SELECT mc FROM MyClass mc ";
Query query = entityManager.createQuery(sQuery);
List<MyClass> results = query.getResultList();

but with no success...

What's the problem?? Can you help me??

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CriteriaQuery and JPA Lele <lamia@mail.lcom> - 2011-09-07 15:15 +0200
  Re: CriteriaQuery and JPA Lew <lewbloch@gmail.com> - 2011-09-07 11:02 -0700
    Re: CriteriaQuery and JPA Lele <lele@lele.com> - 2011-09-08 09:48 +0200
    Re: CriteriaQuery and JPA Lele <lelel@lele.com> - 2011-09-08 15:03 +0200
      Re: CriteriaQuery and JPA markspace <-@.> - 2011-09-08 06:39 -0700
        Re: CriteriaQuery and JPA Lele <lelel@lele.com> - 2011-09-08 16:53 +0200
          Re: CriteriaQuery and JPA Lew <lewbloch@gmail.com> - 2011-09-08 09:05 -0700

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