Criteria Builder Create new Object In Select Statement

Question

I was wondering if it\'s possible to create such query like :

em.createQuery(
        \"SELECT NEW EmpMenu(p.name, p.department.name) \"
            + \"FROM Pro         


        

Answer 1

Yes, Criteria API does have have construct similar to JPQL constructor expressions. Result class is set via construct method in CriteriaBuilder.

Your JPQL query expressed as an criteria query is:

CriteriaBuilder cb...
CriteriaQuery<EmpMenu> q = cb.createQuery(EmpMenu.class);
  Root<Project> c = q.from(Project.class);
  q.select(cb.construct(EmpMenu.class,
      c.get("name"), c.get("department").get("name")));