many to many CMR

[index]

Hi,
I checked sources for exercise 7. I'm trying to understand the way Jboss handles many to many relationships. Questions are - Do I need to create link table? Do I need to map the link table in descriptors - how? Does jboss handle that (create table) automatically?

Thanks, Milan

[index]

hi, is there anyone?
I just wonder how these examples work at all - there are no relationships declarations in jbosscmp-jdbc.xml
Aren't these declaration supposed to be there?
Milan

[zeroshot]

i was impressed on how jboss did this i declared a many-many relationship in the ejb-jar.xml and jboss created the link table on its own with the necessary stuff needed

[slaboure]

Hello,

By default, JBoss can take decision by itself if you don't specify anything. Consequently, most CMP2 applications do not require a jboss specific deployment descriptor at all (at least during prototyping, when you don't care about table names, etc.)

Cheers,


sacha

[destr0]

Okay, so I finally found out that jboss will generate the linking table on it's own for a many to many relationship. But is it possible to map a pre-existing linking table for the link between two tables in a many to many relationship? I can't find any examples of how to do this in the orielly book, or in the jboss-specific workbook. I just want to use a pre-existing link table that I already have.

[slaboure]

Yes, this is described in the JBossCMP specific book in details.

Cheers,


sacha

[musophil]

I believe the J2EE Patterns book available at www.theserverside.com provides a good clear explination of different approaches to achieving CMR with or without control control by the container.

Its a good book, although lacks XDoclet.