Can HQL Select on the result set of another query?

Question

Can HQL Select on the result set of another query?
For example:

SELECT COUNT(*) FROM (SELECT * FROM Table)

I can do it in SQL but w

Answer 1

there is no way to do subquery in from clause in HQL even if the database support it, I solved this problem by putting the query into the sql as a store procedure, then call the procedure in HQL. For example:

Insert the procedure into your sql:

DELIMITER $$
CREATE PROCEDURE `procedure_name`(
  `arg_name` INT,
) BEGIN
     your query here
END;
$$
DELIMITER ;

Then, if you use hibernate, call this procedure from java code as below:

Query query = session.createSQLQuery("CALL procedure_name(:arg_name)");
query.setParameter("arg_name", args);
List list = query.list();

Hope this can help you.