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select 'new java object' cannot handle collection

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damianharvey

Post subject: select 'new java object' cannot handle collection

Posted: Mon Nov 19, 2007 4:18 pm

Beginner

Joined: Thu May 17, 2007 8:37 am
Posts: 22
Location: London

If I have an entity 'Person' that has an associated collection 'Books' why can't I write a query like this:

Code:

ThisQueryBean thisQueryBean = entityManager.createQuery(
    "select new ThisQueryBean(p, p.books) from Person as p")
    .getResultList();

The problem seems to be with p.books being a collection. If it is an object or primitive then it is fine. The constructor for ThisQueryBean looks like this:

Code:

public ThisQueryBean(Person p, List<Book> books) {
    etc, etc

Is what I am trying to do not supported/stupid? It would be very convenient. The alternative is to do a distinct join which works but doesn't feel as elegant.

Thanks,

Damian

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