Hi,
For 1-N relationships, I use a reverse referencing mechanism. I A has n B,
then I have a field in B hwich has the type of the remote interface of A.
Then I make a finder method in A that return a Collection of B remote
interfaces.
All that in CMP on JBoss. The life is beautiful ;)
This is mandatory for EJB 1.1.
The disadvantage is that I store EJBObject as key in the database so bye bye
direct SQL.
If one A can share multiple B with another A, then I think its is possible
to do something like having a Collection of remote interfaces of, look at
jbosstest for an example. But I do not think the EJB 1.1 spec require
anything for that. Not sure.
For n-m nothing in the 1.1 spec but having a C in the middle is one
solution.
If you follow the principle of having one unique key for any tables, you
could also use this a field of primitive type wich saves the direct SQL
problem. If multiple field is part of a key the PK object will be serialize
to the database so again bye bye SQL.
Vincent.
-----Message d'origine-----
De : [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]De la part de Florian Bischof
Envoye : lundi 26 fevrier 2001 17:40
A : [EMAIL PROTECTED]
Objet : [jBoss-User] CMP Relationships
Hi all,
is there an example, documentation or tutorial for relationships
(1-n/n-m) between container-managed persistence entity beans existing
(working on JBoss)?
Anyone already using CMP-relations on jBoss?
Thanks
Florian
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