What does JPA EntityManager.getSingleResult() return for a COUNT query?

Question

What does EntityManager.getSingleResult() return for a COUNT query?

So.. what is the precise runtime type of foo?

Object foo = em.createQuer         


        

Answer 1

Native queries can return different objects for a COUNT based on the database driver; however, all those objects extend java.lang.Number, which implements the longValue() method.