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javajpajava-ee-6jpql

How do I limit JPQ output?

I need to limit number of entities returned by a query to some certain value inside a JPA query (through JPQL). Particularly:

select m from Manual m //constraint

e.g. in sql (mysql syntax) I would do it like:

select * from Manual limit 1

The only solution that comes up is simply to get all entities and then choose first one, which is out of the question. Any ideas?

Solution

  • To do that I may limit Query instance, as follows:

    em.createQuery("select m from Manual m").setMaxResults(1).getSingleResult()