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List instances without derived classes

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mogadanez

Post subject: List instances without derived classes

Posted: Tue May 06, 2008 12:03 pm

Newbie

Joined: Thu Jun 22, 2006 12:51 pm
Posts: 10

I have 2 classes

class A{}
class B:A{}
both mapped to same table with descriminator

when i do
ICriteria criteria = session.CreateCriteria( type );
return criteria.List();

It will return all instances of A and B.

Can i query only A List without subtypes?

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FlukeFan

Post subject: List instances without derived classes

Posted: Tue May 13, 2008 11:52 am

Senior

Joined: Thu Jun 21, 2007 8:03 am
Posts: 127
Location: UK

Hi,

If both classes are mapped, then I think it's by design that NHibernate will load all the subclasses when you load the base-type (because in your example B 'is a' A).

The only workaround I can think of is to try something like:

Code:

session
    .CreateCriteria(typeof(A))
    .Add(Expression.Sql("myDiscriminatorColumn = ?", discriminatorValueForClassA))
    .List();

Regards,
Richard

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