Hi Werner, On Aug 28, 1:39 am, "Werner F. Bruhin" <[EMAIL PROTECTED]> wrote: > Mike, > > Sent this a bit to quickly > > > > Mike wrote: > > Hi, > > > I am working on a wxPython application that saves data to various > > tables in our MS SQL Server 2000. I connect to one table and get data > > using a session. This works great. I then do a session.close() and > > then a conn.close() where conn = engine.connect(). This seems to work > > as expected as well. The problem happens when I connect to the second > > table. I get the data from the second table just fine, but when I try > > to update it using my 2nd session object, I get the following error: >
<traceback snipped> > > To get the data, I do the following: > > > pref = session.query(Acct_Prefs).filter_by(empID=self.emp_id, > > pref_name='last_payPeriod').first() > > > Then I change a value like this: > > > pref.pref_value = someValue > > > Finally, I do a session.flush() and session.commit(). I've tried using > > just a commit(), but I get the same error. Since I can run this second > > session by itself in IDLE, I think the 1st session or connection or > > something is somehow messing up the second one. Any ideas on what is > > going on would be great. I'm still pretty green with SA, by the way. > > > I am developing on Windows XP, Python 2.5.2 and using SqlAlchemy > > 0.4.7. I can upgrade if you guys think that's the issue. > > I am no expert in SA, but I am converting my application over to it. > > Why are you closing the session? As I walked in this morning, I realized that closing one session and opening a second one was probably stupid. I was trying to avoid mapping tables unless I needed them, but I think I'll just map all of them. > > You can work with many tables and do all your queries all in the one > session. > > self.session = Session() > pref = self.session.query(db.Preferences).get(1) > # change pref here > self.session.commit() > > cellar = self.session.query(db.Cellar).get(1) > # change cellar here > self.session.commit() > > etc etc Does this work for multiple databases? This particular program I am working on will be connecting to 2 or 3 databases and a table or three in each of those. I'm pretty sure I have to create separate engines for each db and probably bind separate sessions for those. > > I think in most wxPython application you would create the session in > wx.App.OnInit and close it in wx.App.OnExit. > > Should you package your application with py2exe you should probably > include this in your OnExit method: > > self.session.close_all() > self.engine.dispose() > > I was seeing that my application would hang on closing if I did not do > this. I am using Firebird SQL, it might be something to do with that db > as I heard from others using SA that they did not see this problem. > > Werner Thanks for the quick reply. Mike --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
