I have the following SQL that I am having problems converting to HQL. A NPE is getting thrown -- which I think has something to do with the SUM function. Also, I'd like to sort on the subselect alias -- is this possible?
SQL (subselect):
SELECT q.title, q.author_id,
(SELECT IFNULL(SUM(IF(vote_up=true,1,-1)), 0)
FROM vote WHERE question_id = q.id) AS votecount
FROM question q ORDER BY votecount DESC
HQL (not working)
SELECT q,
(SELECT COALESCE(SUM(IF(v.voteUp=true,1,-1)), 0)
FROM Vote v WHERE v.question = q) AS votecount
FROM Question AS q
LEFT JOIN q.author u
LEFT JOIN u.blockedUsers ub
WHERE q.dateCreated BETWEEN :week AND :now
AND u.id NOT IN (
SELECT ub.blocked FROM UserBlock AS ub WHERE ub.blocker = :loggedInUser
)
AND (u.blockedUsers IS EMPTY OR ub.blocked != :loggedInUser)
ORDER BY votecount DESC
Here is the working HQL if anyone is interested:
SELECT q,
(SELECT COALESCE(SUM(CASE v.voteUp WHEN true THEN 1 ELSE -1 END), 0)
FROM Vote v WHERE v.question = q) AS votecount
FROM Question AS q
LEFT JOIN q.author u
LEFT JOIN u.blockedUsers ub
WHERE q.dateCreated BETWEEN :week AND :now
AND u.id NOT IN (
SELECT ub.blocked FROM UserBlock AS ub WHERE ub.blocker =:loggedInUser
)
AND (u.blockedUsers IS EMPTY OR ub.blocked !=:loggedInUser)
ORDER BY col_1_0_ DESC
Notice the ORDER BY col_1_0_
There is an open issue with Hibernate -- it does not correctly parse aliases and since the aliases are renamed in the query, an error will be thrown. So, col_1_0_ is basically a workaround --it's the name Hibernate generates. See issue: http://opensource.atlassian.com/projects/hibernate/browse/HHH-892
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