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Mohamed Jamal
 Post subject: Polymorphic resultset using SQLServer 2005
PostPosted: Wed Apr 04, 2007 7:39 pm 
Newbie

Joined: Fri Mar 09, 2007 2:57 pm
Posts: 3
Location: Cold Canada
I'm having an issue executing a search for all polymorphic types using the Criteria API.

I have the following classes:
- AbstractClassA
- ClassB extends AbstractClassA
- ClassC extends AbstractClassA

AbstractClassA has properties of type TEXT

Code:
Criteria criteria = session.createCriteria(AbstractClassA .class, "ae");
List results = criteria.list();


Unfortuantely
SQLServer 2005 spits out the exection:
Quote:
SEVERE: The text data type cannot be selected as DISTINCT because it is not comparable.
Exception in thread "main" org.hibernate.exception.SQLGrammarException: could not execute query
at ...


The resulting sql is actually a union on the tables that represent ClassB and ClassC. On the microsoft forum this is listed as an issue, does anyone have a work around?

http://forums.microsoft.com/MSDN/ShowPo ... 7&SiteID=1

Thanks.
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Mohamed Jamal
 Post subject:
PostPosted: Thu Apr 12, 2007 3:49 pm 
Newbie

Joined: Fri Mar 09, 2007 2:57 pm
Posts: 3
Location: Cold Canada
Ok,

I found the answer in a previous post in the forum.
http://forum.hibernate.org/viewtopic.php?t=971583

Apparently, the problem can circumvented by extending the SQLServerDialect Class.

Code:
public class MOSQLServerDialect extends SQLServerDialect {

    public boolean supportsUnionAll() {
        return true;
    }
}


Then simply ensure you specify the new dialect in your Hibernate.cfg.xml

Enjoy.
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