Is it possible to write this Query as a TypedQuery and let the two Long's run into a Object with two public Long fields inside.
Query q = em.createQuery(
"SELECT c.id, COUNT(t.id) " +
"FROM PubText t " +
"JOIN t.comm c " +
"WHERE c.element = ?1 " +
"GROUP BY c.id");
q.setParameter(1, e);
List<?> rl = q.getResultList();
Iterator<?> it = rl.iterator();
HashMap<Long, Long> res = new HashMap<Long, Long>();
while (it.hasNext()) {
Object[] n = (Object[]) it.next();
res.put((Long)n[0], (Long)n[1]);
}
return res;
JPA has a feature just for this - constructor expressions:
Query q = entityManager.createQuery("SELECT NEW com.example.DTO( c.id, COUNT(t.id)) FROM ...");
List<DTO> dtos = q.getResultList();
Your DTO class can be a POJO. All it will need is a public constructor accepting 2 Long
s. Please note that you have to provide a fully qualified name of your class after the NEW
operator.