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

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北海茫月
北海茫月 2021-02-01 02:43

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

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

Object foo = em.createQuer         


        
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  •  粉色の甜心
    2021-02-01 03:36

    COUNT(t) specifically returns java.lang.Long. When its appears on its own in this context it is returned as-is.

    (In other contexts the Long generated by COUNT may be wrapped, but not today.)

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