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From "Beyer,Nathan" <NBE...@CERNER.COM>
Subject what to expect - jpa spec or impl discretion
Date Mon, 21 Jul 2008 15:15:31 GMT
I'm trying to write a bit of code that's portable between JPA providers and ran into a few
differences and I'd like to know if they are undefined bits of the spec or just me doing something
silly.

1.	0 is considered null for primary key fields (@Id) of type int, long - OpenJPA DOES NOT
do this, but other providers, such as EclipseLink do. Is this in the spec or up for debate?

2.	Return value of native queries is an Object[] or a List - Consider the following snippets
		
		 // LOG is table name with a 'sequence' column/field of Java type 'long'
        final Query query = entityManager.createNativeQuery("SELECT MIN(e.sequence), MAX(e.sequence)
FROM LOG e");
        final Object result = query.getSingleResult();
		
		With OpenJPA a Object[] is returned, in EclipseLink a List is returned. Is this defined
anywhere? How can I define it.


Thanks,
-Nathan

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