Question

Here is my HQL:

Query query = createQueryOnCurrentSession("DELETE Email e " +
                "where " +
                "(status = :sent and creationTime <= :creation)" +
                "or " +
                "(status = :error and maxEttempts >= :maxEttempts)");

Here is the generated SQL:

delete from `email` where `status`=? and `creation_time`<=? or `status`=? and `attempts`>=?

Question: why are the brackets not in the SQL?
I would expect it to be:

delete from `email` where (`status`=? and `creation_time`<=?) or (`status`=? and `attempts`>=?)

may be as alternative I will delete in 2 requests?

delete from `email` where `status`=? and `creation_time`<=?
delete from `email` where `status`=? and `attempts`>=?

Answer 1

It’s actually a feature.

Since and has precedence over or, hibernate knows it, and removes brackets.

You don’t need those brackets there.