Hi,
I created a named query like this:
| @NamedQuery(name = "topItems", query = "select i from Orderitem oi inner
join oi.item i group by i order by sum(oi.quantity) desc")
|
| public Collection<Item> getTopItems()
| {
| Query q = em.createNamedQuery("topItems");
| q.setMaxResults(25);
| return (Collection<Item>) q.getResultList();
| }
|
But this doesn't seem to work like I expect it to work: I get an exception from
the JDBC-driver :( It seems like my database (MySQL) doesn't like the
"sum(oi.quantity)" in the order by clause :(
well, I played with the sql, and it seems like MySQL would prefer something
like this:
| @NamedQuery(name = "topItems", query = "select i, sum(oi.quantity) as qty
from Orderitem oi inner join oi.item i group by i order by qty desc")
|
But this in turn doesn't seem to work with hibernate, at least I tried to
evaluate this expression in the HQL-Editor, and hibernate could not create a
SQL-statment :(
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http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4024559#4024559
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