From: Philipp Meier <meier@...>
Date: 2002-08-28T19:15:51+09:00
Subject: Re: Distributed Object Container


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On Wed, Aug 28, 2002 at 05:41:58PM +0900, Tom Sawyer wrote:
> On Wed, 2002-08-28 at 02:04, Philipp Meier wrote:
> > I recently stumbled over OJB (http://jakarta.apache.org/ojb/) which is a
> > object relational bridge including a ODMG 3.0 complient API. Although I
> > didn't tried it yet I think something like that is missing for ruby. Of
> > course, the API must be ruby like. The concept of blocks in ruby would
> > be great for transaction demarkation (sic?), e.g. I imagine writing db
> > access or generally access to persistent object like this:
> >=20
> > def add_item_to_cart(item_ids)
> > 	transaction.serializable do
> > 		@warehouse.queryByValue(:id, item_ids) do |item|
> > 			item.instock -=3D 1
> > 			@cart[@item] +=3D 1
> > 		end
> > 	end
> > end
>=20
> while your example is bit more then i have yet provided, if your are
> interested in being able to move you objects in and out of a database
> with minimal fuss, i have created DBize (soon to be released as well) it
> is primarily a mixin module that makes an object instantly
> "relationable". it also provides for subrecords (i.e. many-to-one table
> relationships).

I remember your post but already made a db persistence mixin myself.
What I actually want goes a little further: transactions not tied to a
db. That's why i used the example above, a cart usually is held in
memory and not in a db. Or think of atomic transactions spanning a db
and files or a printer (mark bill as printed in db if and only if it's
succesfully printed).

-billy.

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