Hi!
Guillaume Rousse wrote:
>
> In a well separated layer design, applicative layer should be independant of
> persistance layer. So the use of a OODBMS or A RDBMS should not influate
> modeling in the application layer.
That's a strong statement! An ODBMS enables you to simply make some of
your domain objects persistent, and hence puts you in a position to use
a part of your domain object model as your "database schema" (persistent
object model). What you are saying is that this approach should not be
used because it does not result in a "well separated layer design".
Is this an agreed upon view?
cheers,
gerald
> Entity beans are clearly violating this separation rule. But from what i've
> understood so far, session beans were designed to model process rather than
> concept. Moreover, they have no persistance. So how can you use them to model
> real-world entities ?
> As they are powerful open-source RDBMS, and even hybrid DMBS available, this
> question is important for people aiming public research project, rather than
> e-business.
>
> Le jeu, 02 mar 2000, vous avez �crit :
> > You can use Entity Beans with OODB, but it is overhead and does not add
> > value. Session Beans to pure objects is a very nice model. Very clean on the
> > server side, and forces Service Based Architecture, which we think is a good
> > thing.
>
> Cheers
> --
> Guillaume Rousse
>
> Iremia - Universit� de la R�union
> 15 avenue Ren� Cassin, BP 7151
> 97715 Saint Denis, messagerie cedex 9
> Tel:0262938330 Fax:0262938260 ICQ:10756815
>
> BRIDGEKEEPER: What... is the air-speed velocity of an unladen swallow?
> ARTHUR: What do you mean? An African or European swallow?
>
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