Thanks a lot Michael. The merge functionality is what I was looking for. This also exposed a flaw in our model I think. We keep using the auto-increment primary keys which would make merge() impossible to use in the scenario I was describing. Right?
> > The easiest way to do auto "insert or update" given an object that > you've loaded from a file is to use merge(): > > myobj = session.merge(myobj) > > which will do the SELECT for you. If the object is already loaded, no > SELECT is emitted. > > So it follows then that you can SELECT all the rows of the table ahead > of time, keep them referenced in a collection: > > all_objects = session.query(MyStuff).all() > > then you can merge() each element you pull from the file as needed, > and no additional SQL should be emitted to fetch any of it. --~--~---------~--~----~------------~-------~--~----~ 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 sqlalchemy+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
