I have case where I have class A and joined-subclasses B, C. The data is in 3 tables. All queries on base class are resolved as joins to B and C. For performance reasons I would like to use base classes table ONLY to load super class part of all instances, is there a way to do this without specifying all the properties?

Thanks for ideas,
Lukasz

check implicit, explicit words in the reference guide

I assume that you are speaking about:
<class
polymorphism="implicit|explicit"

it sound fine, but this is controlled in configuration layer and I am looking for something that could be controlled in application layer - in query string.

I would like to use both implicit and explicit :)

Workaround for this would be an ability to set <joined-subclass lazy=

Likewise, the special property class accesses the discriminator value of an instance in the case of polymorphic persistence. A Java class name embedded in the where clause will be translated to its discriminator value.

from eg.Cat cat where cat.class = eg.DomesticCat

it's in the reference guide....

I think I am looking for opposite idea.

Let say I have mapping:


I have Cats, Wild Cats, and Domestic Cats.
Now I would like to display a list of all cats using general cat information only (the one from base Cat class). I would like to get instances of Cat class including Cats, Wild Cats, and Domestic Cats. But I do not want the hibernate engine to load subclass specific data - especially LOB's:)

Does any one have an idea how to load superclass specific data only?

Lukasz