don't know about jdo but as far as castor xml is concerned,
the support for interfaces and polymorphism is great.
see the documentation on xsi:type under the "xml mapping"
section.
/ eitan
----- Original Message -----
From: "Pascal Bleser" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, April 23, 2002 9:07 AM
Subject: Re: [castor-dev] Polymorphism ?
> >>The documentation is not really clear about this, so I'm just
> >>posting my question here: what's the status of polymorphism
> >>support in Castor ?
> >>Has it been reimplemented/fixed ?
>
> > Polymorphism (at least whow I understand it) is done via the extends
attribute and works very well for me.
> > I have created a patch which even allows OQL queries on base types to
return the actual type of that objects. A simple example:
>
> That's exactly what I meant: inheritance.
>
> The idea is that we have base classes that have attributes that are common
to all products.
> But every product has its own extensions in form of additional attributes
and relationships,
> and the only way we see how we could implement this specialization is by
using a
> object-relational mapping: Castor ;-)
>
> But inheritance capabilities in Castor would also mean that we can store
inheritance paths
> into several tables or just in one (which is not normalized, but faster).
> I think that Castor does support that, right ?
>
> My point is that Castor is known not to support polymorphysm, but is that
still true
> (we made an evaluation of Castor some months ago and it still appears to
be like
> that in the documentation) ? Is the documentation outdated on that point ?
> I not, what exactly is Castor's limitation in that area ?
>
> > wile return A, B and C objects, depending on a tzype column you have to
specify.
> >
> > This patch hasn't been included in the CVS so far, but we're working on
that, and you can have it if you
> > like to apply it for yourself.
>
> I'm not that far right now, but I'll definately keep it in mind.
>
> Thanks for any help about this...
> --
> -o) Pascal Bleser ATOS Origin/Aachen(DE) |
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