[hibernate-dev] [OGM] Behavior of GenerationType.IDENTITY with OGM

[Gunnar Morling]

Ah, is that specified somewhere? I couldn't find anything in the spec from
a quick look.


2014/1/20 Emmanuel Bernard <emmanuel at hibernate.org>

> The problem is that in JPA, IDENTITY returns a long, not a UUID.
>
> On Mon 2014-01-20 12:23, Gunnar Morling wrote:
> > Hi,
> >
> > While reviewing the PR for batch operations in OGM [1], I took some time
> to
> > better understand OGM's approaches for id generation.
> >
> > Now I'm wondering about how GenerationType.IDENTITY is implemented. The
> > corresponding generator (OgmIdentityGenerator) just delegates to a
> > table-based strategy, so an id is always pre-allocated and then passed
> into
> > the dialect when creating a tuple.
> >
> > I think it would be nice to have proper support for server-generated ids,
> > in particular since some stores return the inserted id directly from the
> > insert operation, i.e. without requiring another read.
> >
> > For the time being, as the current implementation doesn't really adhere
> to
> > the semantics of GenerationType.IDENTITY, should we raise an error when
> > using it instead of silently using another strategy?
> >
> > Thoughts?
> >
> > --Gunnar
> >
> > [1] https://hibernate.atlassian.net/browse/OGM-175
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