JPA
Query q=em.createQuery("select sum(o.montant) from Operation o join
o.codTransac t join o.codCaisse c where (t.sens='D')and
(c.dateCaisse=o.dateOp)");
Query q = em.createQuery("DELETE FROM Subscription s WHERE s.subscriptionDate < :today");
q.setParameter("today", new Date());
int deleted = q.executeUpdate();
Date now = new Date();
Date thirtyDaysAgo = new Date(now.getTime() - (30 * MS_IN_DAY));
Query q = em.createQuery("Select m from Message m "
+ "where m.targetTime < :now and m.targetTime > :thirtyDays");
q.setParameter("now", now);
q.setParameter("thirtyDays", thirtyDaysAgo);
List<Message> results = (List<Message>) q.getResultList();
