s.createSQLQuery( "delete from TRUCK" ).executeUpdate();
l = s.createQuery("from Vehicle").list();
assertEquals(l.size(),4);
Car c = (Car) s.createQuery( "from Car where owner = 'Kirsten'" ).uniqueResult();
c.setOwner("NotKirsten");
assertEquals(0,s.getNamedQuery( "native-delete-car" ).setString( 0, "Kirsten" ).executeUpdate());
assertEquals(1,s.getNamedQuery( "native-delete-car" ).setString( 0, "NotKirsten" ).executeUpdate());