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FMcGeough
 Post subject: Delete "where exists" for child table
PostPosted: Mon Dec 05, 2005 2:44 pm 
Newbie

Joined: Tue Oct 25, 2005 12:32 pm
Posts: 13
Can somebody give me a Hibernate example of delete "where exists" usage? I want to delete all the rows from a child table based on a criteria in the parent. Something like this:

Code:
    DELETE FROM Child
    WHERE EXISTS 
    (SELECT 1 FROM Parent
    WHERE 
    Parent.field1 = 642 
    AND 
    Parent.field2 = 1 
    AND 
    Parent.pkid = Child.fkeyid)


I am using/evaluating Hibernate 3.1 rc3.
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FMcGeough
 Post subject:
PostPosted: Tue Dec 06, 2005 10:27 am 
Newbie

Joined: Tue Oct 25, 2005 12:32 pm
Posts: 13
I figured this out so I wanted to post a reply in case someone else is looking for an example. In HQL

Code:
String hqlDelete = "delete from Child c where exists (from c.parent p where p.field1 = 642 AND p.field2 = 1)";
int numDeleted = session.createQuery(hqlDelete).executeUpdate();


Hibernate automatically adds the foreign key relationship between child and parent to the exists clause.
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