Hi Honoria
Inheritance is not specified by the EJB specification (even in 2.0).
The current specification has been mostly thought for RDBMS persistence.
If you need inheritance (that I can understand) you can either :
* use a specific container that includes an O/R mapping tool
* use a specific container that supports a pure ODBMS
The current EJB component model is not an object model at all. If you need
full object support only an ODBMS container can help you. JOnAS will provide
in a next release a container that will support ODBMS, in SMP mode (Session
beans that can access pure Java objects, transparently stored in an ODBMS, a
kind of CMP mode extended to all Java).
JOnAS will later support a complete CMP mode where Entity Beans will support
inheritance, collections, references, transparent navigation.
We can hope that the EJB specification will also evolve to support a more
complete object model.
Right now, most of EJB containers provide data access only through JDBC. And
JDBC doesn't provide anything to support inheritance, because RDBMS will
never support it (that's too orthogonal with the relational model).
Best Regards,
Eric Samson
LIBeLIS, Liberty for Large IS
+33 6 0302 5341
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
-----Message d'origine-----
De : [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]De la part de Honoria Sauciuc
Envoye : mercredi 10 janvier 2001 15:23
A : [EMAIL PROTECTED]
Objet : CMP 1.1 IsA limitation
Hi!
I am doing a research for the best EJB container that
would fit my needs and I have a question I would like
to know the answer to, because I don't have the time
to test it my self. I am sorry if I didn't know where
to search to the answer but I didn't find the part of
docs that would clear this in my mind. Here it is:
I hear some EJB containers does not support IsA type
inheritance for Container Managed Persistence Entity
Beans. Is it really a container problem or a CMP 1.1
specification one? Does Jonas support such inheritance?
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