.class property does not function in polimorphic queries

rocket · **Posted:** Thu Jul 01, 2004 4:24 pm

Hi all,
I have one class "Element" and 2 joined classes "System" and "Frame" that are, obviously, specializations.
Thus, I try to execute a simple select, like this:

Code:

from Element e where e.class = System

But it does not return nothing!

My model is:

Code:

        +-----------------+
        |                 |
        |n elements       |n permissions
     Element          Permission
         A
         |
         | <<joined>>
         |
   +-----+-----+
   |           |
  System     Frame
  |1 system    |n frames
  |            |
  +------------+

I need to select all elements that are "systems" from association between Permission and Element.
I try this, but it does not function:

Code:

select e from Permission p join p.elements e where e.class = System

Thanks for all.

steve · **Posted:** Fri Jul 02, 2004 1:46 am

Are your classes in packages? I don't think class names specified in the where clause look at the auto-imported class names. Use the FQN of the class System.