Hi,
OpenJPA does assign special meaning to '0' value for primary key. For
example, one such special meaning is when an instance X is being merged and
does not have a version field, if primary key value of X is 0, then X is
assumed to be new, otherwise X is considered as an update.
Beyer,Nathan wrote:
>
> 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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