[ZODB-Dev] Multiple independant ZODB

[Matthew Noble]

Thanks Christian.
With a little rooting around based on your advice I have got the independent saving working.
Thanks for your help.
Matt

-----Original Message-----
From: zodb-dev-bounces+mnoble=xype.com at zope.org [mailto:zodb-dev-bounces+mnoble=xype.com at zope.org] On Behalf Of Christian Theune
Sent: 14 May 2010 09:31
To: zodb-dev at zope.org
Subject: Re: [ZODB-Dev] Multiple independant ZODB

On 05/14/2010 10:06 AM, Matthew Noble wrote:
> I have only just started to use ZODB and have been able to use it with
> ease so far.
>
> I want to be able to have access to multiple ZODB databases at the same
> time that are completely independent.
>
> What I cannot see how to do is to keep the changes to the objects from
> each database separate - that is making the transaction commits only
> occur for one database at a time even if changes have occurred to
> multiple databases between commits.
>
> Can the transactions be made specific to a particular database or
> connection?

Yes.

The default transaction functions in transaction.commit/abort/... work 
with a transaction manager that selects the active transaction based on 
the thread from which it is called.

Whenever you open a connection using DB.open() you can pass in a 
different transaction manager and thus get different transactions with 
as many databases as you like.

Christian

-- 
Christian Theune · ct at gocept.com
gocept gmbh & co. kg · forsterstraße 29 · 06112 halle (saale) · germany
http://gocept.com · tel +49 345 1229889 0 · fax +49 345 1229889 1
Zope and Plone consulting and development

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