Re: [hibernate-dev] Programmatic entity mapping API

[Steve Ebersole]

On Tue, Oct 24, 2017 at 8:38 AM Gunnar Morling  wrote:

> Sure. But it's great to know that you'd find it useful and can imagine
> adding it. Thanks!
>

In fact we have similar requirement in ORM itself for hibernate-envers,
 but again the initial expectation is supporting this at the boot-model
level, not the runtime-model level.  Ultimately I'd like to use Jandex as
the thing that is built - for many reasons.
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Re: [hibernate-dev] Programmatic entity mapping API

[Gunnar Morling]

2017-10-24 15:08 GMT+02:00 Steve Ebersole :

> Of course you pick the easy case to illustrate :)  A single entity with
> nothing but basic attributes or self-referential associations is going to
> be relatively simple.  The trickier stuff is adding 2 entities with
> association between them, "property-ref" FKs, etc.  Then your fluent API is
> not so fluent.
>

Yeah, I just made up something quickly to ignite the discussion. I also
expect it to be more complex when done completely.


>
> Overall I can see the utility of this but:
>
>1. I'm not sure your intention here with exposing this from Session,
>but a huge -1 to in any way allowing this even after the SessionFactory is
>built.
>
> Ah, I knew I'd get that wrong ;)

I just meant to illustrate there's *some* entry point into the API, full
ack it should be on the SF/EMF level of course.

>
>1. Related to this, I can definitely see exposing this to build the
>boot-time model as in the org.hibernate.mapping package - but not so much
>the runtime model.  Ultimately as we move to Jandex for describing the
>boot-time model specifically I can see this API building those structures.
>2. Not a high priority for me.  In fact between 6 and then the Jandex
>work I mentioned, I do not foresee having time to work on this
>
> Sure. But it's great to know that you'd find it useful and can imagine
adding it. Thanks!


>
> On Tue, Oct 24, 2017 at 6:36 AM Alessio Stalla 
> wrote:
>
>> That would be great for framework developers as well.
>>
>> Il 24 ott 2017 12:01, "Gunnar Morling"  ha scritto:
>>
>> > Anyone with thoughts on this? To elaborate, here's what I have in mind:
>> >
>> > EntityMapping mapping = session.addEntityMapping();
>> > mapping.entity( Person.class )
>> > .table( "PERSONS" )
>> > .property( "personId" )
>> > .id()
>> > .strategy( Strategy.IDENTITY )
>> > .property( "phoneNumbers" )
>> > .oneToMany()
>> > .mappedBy( "person" )
>> > .property( "favouriteColor" )
>> > .converter( ColorConverter.class );
>> >
>> > I'm curious whether others think that'd be useful or not.
>> >
>> > Vlad, perhaps you have any insights from the field?
>> >
>> > Cheers,
>> >
>> > --Gunnar
>> >
>> >
>> >
>> >
>> > 2017-10-13 21:21 GMT+02:00 Gunnar Morling :
>> >
>> > > Hi all,
>> > >
>> > > This has crossed my mind for a few times: should we provide a
>> > programmatic
>> > > API in Hibernate ORM for mapping entities, as an alternative mapping
>> > > definition source to annotations and XML? I.e. something similar to
>> the
>> > > programmatic mapping APIs we have in Hibernate Validator and Search.
>> > >
>> > > It'd probably be a fair bit of work (though giving lots of fun with
>> API
>> > > design), but I can see how it could be appealing to folks preferring
>> > > API-style ways of configuring their stack, which seems more and more
>> en
>> > > vogue these days. Using lambda expressions would be attractive
>> especially
>> > > when it comes to plugging in custom behaviours, e.g. for value
>> > generators.
>> > >
>> > > Any thoughts?
>> > >
>> > > --Gunnar
>> > >
>> > >
>> > ___
>> > hibernate-dev mailing list
>> > hibernate-dev@lists.jboss.org
>> > https://lists.jboss.org/mailman/listinfo/hibernate-dev
>> >
>> ___
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>> hibernate-dev@lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/hibernate-dev
>>
>
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Re: [hibernate-dev] Programmatic entity mapping API

[Steve Ebersole]

Of course you pick the easy case to illustrate :)  A single entity with
nothing but basic attributes or self-referential associations is going to
be relatively simple.  The trickier stuff is adding 2 entities with
association between them, "property-ref" FKs, etc.  Then your fluent API is
not so fluent.

Overall I can see the utility of this but:

   1. I'm not sure your intention here with exposing this from Session, but
   a huge -1 to in any way allowing this even after the SessionFactory is
   built.
   2. Related to this, I can definitely see exposing this to build the
   boot-time model as in the org.hibernate.mapping package - but not so much
   the runtime model.  Ultimately as we move to Jandex for describing the
   boot-time model specifically I can see this API building those structures.
   3. Not a high priority for me.  In fact between 6 and then the Jandex
   work I mentioned, I do not foresee having time to work on this


On Tue, Oct 24, 2017 at 6:36 AM Alessio Stalla 
wrote:

> That would be great for framework developers as well.
>
> Il 24 ott 2017 12:01, "Gunnar Morling"  ha scritto:
>
> > Anyone with thoughts on this? To elaborate, here's what I have in mind:
> >
> > EntityMapping mapping = session.addEntityMapping();
> > mapping.entity( Person.class )
> > .table( "PERSONS" )
> > .property( "personId" )
> > .id()
> > .strategy( Strategy.IDENTITY )
> > .property( "phoneNumbers" )
> > .oneToMany()
> > .mappedBy( "person" )
> > .property( "favouriteColor" )
> > .converter( ColorConverter.class );
> >
> > I'm curious whether others think that'd be useful or not.
> >
> > Vlad, perhaps you have any insights from the field?
> >
> > Cheers,
> >
> > --Gunnar
> >
> >
> >
> >
> > 2017-10-13 21:21 GMT+02:00 Gunnar Morling :
> >
> > > Hi all,
> > >
> > > This has crossed my mind for a few times: should we provide a
> > programmatic
> > > API in Hibernate ORM for mapping entities, as an alternative mapping
> > > definition source to annotations and XML? I.e. something similar to the
> > > programmatic mapping APIs we have in Hibernate Validator and Search.
> > >
> > > It'd probably be a fair bit of work (though giving lots of fun with API
> > > design), but I can see how it could be appealing to folks preferring
> > > API-style ways of configuring their stack, which seems more and more en
> > > vogue these days. Using lambda expressions would be attractive
> especially
> > > when it comes to plugging in custom behaviours, e.g. for value
> > generators.
> > >
> > > Any thoughts?
> > >
> > > --Gunnar
> > >
> > >
> > ___
> > hibernate-dev mailing list
> > hibernate-dev@lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/hibernate-dev
> >
> ___
> hibernate-dev mailing list
> hibernate-dev@lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/hibernate-dev
>
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Re: [hibernate-dev] Programmatic entity mapping API

[Alessio Stalla]

That would be great for framework developers as well.

Il 24 ott 2017 12:01, "Gunnar Morling"  ha scritto:

> Anyone with thoughts on this? To elaborate, here's what I have in mind:
>
> EntityMapping mapping = session.addEntityMapping();
> mapping.entity( Person.class )
> .table( "PERSONS" )
> .property( "personId" )
> .id()
> .strategy( Strategy.IDENTITY )
> .property( "phoneNumbers" )
> .oneToMany()
> .mappedBy( "person" )
> .property( "favouriteColor" )
> .converter( ColorConverter.class );
>
> I'm curious whether others think that'd be useful or not.
>
> Vlad, perhaps you have any insights from the field?
>
> Cheers,
>
> --Gunnar
>
>
>
>
> 2017-10-13 21:21 GMT+02:00 Gunnar Morling :
>
> > Hi all,
> >
> > This has crossed my mind for a few times: should we provide a
> programmatic
> > API in Hibernate ORM for mapping entities, as an alternative mapping
> > definition source to annotations and XML? I.e. something similar to the
> > programmatic mapping APIs we have in Hibernate Validator and Search.
> >
> > It'd probably be a fair bit of work (though giving lots of fun with API
> > design), but I can see how it could be appealing to folks preferring
> > API-style ways of configuring their stack, which seems more and more en
> > vogue these days. Using lambda expressions would be attractive especially
> > when it comes to plugging in custom behaviours, e.g. for value
> generators.
> >
> > Any thoughts?
> >
> > --Gunnar
> >
> >
> ___
> hibernate-dev mailing list
> hibernate-dev@lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/hibernate-dev
>
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[hibernate-dev] Programmatic entity mapping API

[Gunnar Morling]

Hi all,

This has crossed my mind for a few times: should we provide a programmatic
API in Hibernate ORM for mapping entities, as an alternative mapping
definition source to annotations and XML? I.e. something similar to the
programmatic mapping APIs we have in Hibernate Validator and Search.

It'd probably be a fair bit of work (though giving lots of fun with API
design), but I can see how it could be appealing to folks preferring
API-style ways of configuring their stack, which seems more and more en
vogue these days. Using lambda expressions would be attractive especially
when it comes to plugging in custom behaviours, e.g. for value generators.

Any thoughts?

--Gunnar
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