Paulo,
If you are asking can couch be used for transactional systems, such as
banking or payment processing...
The database itself doesn't have any transactional locking mechanism.
However, as all documents are revisions... You could actually add
multiple documents with a transaction_state field, and then upon
completing the transaction update the transaction_state field in that
document.
Because unlike SQL, there are no joins, foreign key restraints or
cascading, in order to have a transaction that touches many "tables",
you would need to rethink your data model to incorporate nested data
structures in single documents.
One current deficiency is that you must retrieve documents in order to
modify a field. However this is easily abtracted in a library or
class such that you could use a specified view to extract a subset of
documents then loop through them to update a specified field, then
either use bulk function or another loop to save the new version.
A function like this in use in psuedocode:
trans = new CouchTransaction("myTransaction")
trans.start()
// do stuff
trans.add(doc,db)
trans.add(another_doc,another_db)
If (condition) {
trans.commit()
}
trans.end()
I'm sure others would have better algorithms for what a
CouchTransaction class might involve, but this is off the top of my
head.
HTH,
Jim
Sent from my iPhone
On Oct 27, 2009, at 8:55 AM, Paulo Cassiano <[email protected]> wrote:
I'm totally newbie in CouchDB, but I belive it could be ready for
production
use. True. I only was thinking about how could I develop some e-
commerce app
using it as DB server... Did you think about it before?
On Tue, Oct 27, 2009 at 1:50 PM, Elf <[email protected]> wrote:
Couchdb is ready for production use.
2009/10/27 Paulo Cassiano <[email protected]>:
OK, infact, that's could be a much bigger question.
But I think I'm not the only guy to think about this... If YOU
were asked
to
do this, how did you do?
On Tue, Oct 27, 2009 at 1:07 PM, Matt Goodall
<[email protected]
wrote:
2009/10/27 Paulo Cassiano <[email protected]>:
Every e-commerce app shows at least one product's picture, along
with
descriptions and other useful information. Does CouchDB supports
images -
JPEG, GIF and so on - files?
Each CouchDB doc can have multiple attachments, see
http://wiki.apache.org/couchdb/HTTP_Document_API#Attachments.
I would say a "product" makes an almost perfect CouchDB document.
The
document itself could contain whatever data the product needed to
describe it (description, options, price, bulk prices, etc, etc)
and
the images of the product would be its attachments.
How could I use CouchDB in an e-commerce app?
That's a much bigger question ;-).
- Matt
--
----------------
Best regards
Elf
mailto:[email protected]
