The only portable way I know is by queries which return both, the actual entity
and the computed value as two different result elements, e.g.
EntityManager em;
Query q = em.createQuery("SELECT o, COUNT(o.positions) FROM OrderEntity o ...");
List<Object[]> results = q.getResultList();
for (Object[] result: results) {
OrderEntity order = (OrderEntity)result[0];
order.setPositionCount((Integer)result[1]);
//... do something with your order
}
This is of course somehow selfmade but maybe it helps :-)
Regards,
Jan
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