HQL update problem

public void saveGuest(List<Long> listid) throws HibernateException{ SessionFactory sf=HibernateSessionFactory.getSessionFactory(); System.out.println(listid);

    //long ID=0;
    try {
        session=sf.openSession();
    Query qry=  session.createQuery("update NewContactVO set guestflag ='y' where id in (:listid) " );
    qry.setParameterList("listid", listid);
    String m= qry.getQueryString();
    System.out.println(m);
        int res=qry.executeUpdate();
        System.out.println("updated record are"+res);
        //transaction=session.beginTransaction();
        //transaction.commit();
    } catch (Exception e) {
        e.printStackTrace();
    }
    finally{
        session.close();
    }
}

console============= updated record are2 is showing 2 rows updated but still there is no change in database table HQL plz help