[hibernate-dev] Could UUID be one of the default strategy when AUTO is requested

[Gail Badner]

There are some jiras for using UUIDs (in general, not specifically for IDs) for using a single mapping that would work for different dialects:
- https://hibernate.atlassian.net/browse/HHH-9562
- https://hibernate.atlassian.net/browse/HHH-9574 

It seems that these are related...

----- Original Message -----
> From: "Gunnar Morling" <gunnar at hibernate.org>
> To: "Sanne Grinovero" <sanne at hibernate.org>
> Cc: "Hibernate Dev" <hibernate-dev at lists.jboss.org>
> Sent: Monday, January 19, 2015 8:15:42 AM
> Subject: Re: [hibernate-dev] Could UUID be one of the default strategy when AUTO is requested
> 
> We discussed a while ago whether it should be pluggable how AUTO is
> resolved:
> https://lists.jboss.org/pipermail/hibernate-dev/2014-November/011948.html
> 
> I still think that's a good idea.
> 
> In the case of OGM, it may even be a bit more complex. For example with
> MongoDB the following should result in IDENTITY being used (which is mapped
> to store-assigned object ids) rather than UUID:
> 
>     @Id
>     @GeneratedValue(strategy = GenerationType.AUTO)
>     @Type(type = "objectid")
>     String id;
> 
> So the @Type would have to be taken into account as well for mapping AUTO.
> 
> > For String, I wonder if someone would argue that it should actually map
> to a string-encoded output of a sequence.. "1", "2" ...
> 
> I don't think you can use sequences with String (only numeric values), so
> anyone having this expectation would also be unhappy as of today.
> 
> --Gunnar
> 
> 
> 2015-01-19 15:58 GMT+01:00 Sanne Grinovero <sanne at hibernate.org>:
> 
> > On 19 January 2015 at 13:33, Emmanuel Bernard <emmanuel at hibernate.org>
> > wrote:
> > > Hey,
> > >
> > > I am throwing an idea, let me know what you think.
> > > If the return type of the id property of an entity is either String or
> > UUID, could we automatically consider one fo the uuid strategy as the one
> > matching AUTO?
> >
> > +1
> > That seems spot-on for the UUID type.
> > For String, I wonder if someone would argue that it should actually
> > map to a string-encoded output of a sequence.. "1", "2" ...
> > I'd personally agree that this is horrible and it should default to
> > UUID, just wondering.
> >
> > Would this violate any spec?
> >
> > >
> > > It would be useful for Hibernate OGM but I am also thinking that it
> > makes equal sense to Hibernate ORM users.
> > >
> > > Thoughts? I’m sure there are incompatibilities I have not think of.
> > >
> > > Emmanuel
> > > _______________________________________________
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> > > hibernate-dev at lists.jboss.org
> > > https://lists.jboss.org/mailman/listinfo/hibernate-dev
> >
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