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* listen/notify with python pgdb
@ 2003-03-11 17:16 george young <gry@ll.mit.edu>
2003-03-12 05:28 ` Re: listen/notify with python pgdb Horst Herb <subscriptions@gnumed.net>
0 siblings, 1 reply; 2+ messages in thread
From: george young @ 2003-03-11 17:16 UTC (permalink / raw)
To: pgsql-interfaces
[postgresql 7.3, python 2.3a1, pygresql-3.4-pre021201]
Does anyone use listen/notify with pgdb, the python DB-API
interface? I've done a crude hack, but maybe someone has a nicer one?
{Yes, I know notify is not part of the python DB-API: I'm trying
to stay as close to portable API's and still get the work done...}
Here's what I'm doing:
#pgdb_extended.py
'''This is a small wrapper module for pgdb, the Python DB-SIG 2.0
compliant implentation for postgresql access from python.
This wrapper adds just one member function, viz. 'pgdbCnx.getnotify()'.
getnotify just calls the postgresql libpq C API function getnotify() to
get notify messages resulting corresponding to sql 'listen' commands that
have been made.'''
from pgdb import *
def getnotify(self):
return self._pgdbCnx__cnx.getnotify()
pgdbCnx.getnotify = getnotify
-- George
--
I cannot think why the whole bed of the ocean is
not one solid mass of oysters, so prolific they seem. Ah,
I am wandering! Strange how the brain controls the brain!
-- Sherlock Holmes in "The Dying Detective"
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: listen/notify with python pgdb
2003-03-11 17:16 listen/notify with python pgdb george young <gry@ll.mit.edu>
@ 2003-03-12 05:28 ` Horst Herb <subscriptions@gnumed.net>
0 siblings, 0 replies; 2+ messages in thread
From: Horst Herb @ 2003-03-12 05:28 UTC (permalink / raw)
To: pgsql-interfaces
george young wrote:
> [postgresql 7.3, python 2.3a1, pygresql-3.4-pre021201]
> Does anyone use listen/notify with pgdb, the python DB-API
> interface? I've done a crude hack, but maybe someone has a nicer one?
we are doing it quite extensively in our "gnumed" project, and it works
to our satisfaction.
We run the "listener" in a background thread which then posts messages
on receiving backend notifications.
However, we are using the pyPgSql python adapter, not the pgdb one.
Have a look at
http://savannah.gnu.org/cgi-bin/viewcvs/*checkout*/gnumed/gnumed/gnumed/client/python-common/gmBacke...
Horst
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2003-03-11 17:16 listen/notify with python pgdb george young <gry@ll.mit.edu>
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