Re: Repository Question

[Thomas Mahler]

Hi again,

Russell Smyth wrote:

This also means that  Class A cannot have a reference to or
collection of Class B, correct?

It's not a problem to have such references. But OJB won't be able to treat them automatically. You need explicit broker calls to store instances of the different classes.

You will typically write a thin managing layer on top of the PersistenceBroker to automate this mechanism.

cheers,
Thomas

In our application an object in DB-A has a logical collection of objects in DB-B

Russell

-----Original Message-----
From: Thomas Mahler [mailto:thma@;apache.org]
Sent: Wednesday, November 06, 2002 1:21 PM
To: OJB Users List
Subject: Re: Repository Question


Hi Russel,

Russell Smyth wrote:

In the doc for the repository.xml there is the following statement:

"The jdbc-connection-descriptor element specifies the default jdbc connection for the repository. All class-descriptor elements that do not specify their own jdbc-connection-descriptor will use the default jdbc connection"

This statement implies that class-descriptor elements
can specify a jdbc-connection-descriptor, however the
dtd does not reflect this, nor does it work (I tried!)

The documentation is not accurate in this respect. In the early days of OJB you could specify a jdbc-connection per class.
AT some point in time we decided to have only one jdbc-connection-descriptor per repository.

If you want to work with multiple DBs in parallel you can still do it. You just have to work with multiple broker working against multiple repositories.

SO the idea is to have class A defined in Repository RepA and Class B in RepB.
RepA points to databaseA and RepB to databaseB.

The only drawback of the new solution: Your application must know that A must be looked up in RepA and not in RepB. You will need some additional configuration mechanism to hold this information.

cheers,
Thomas

Is there a way to do per-class jdbc-connection config?
I honestly am not sure how this would work, but it would
be very usefull for my current application where we have
one set of data in one db and another in another, and they
are logically related, so we would like to have ojb
perform the relation for us.

Thanks
Russell

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