Yannick Gingras wrote: > > Hi, I use Alchemy to connection to a legacy system from which I pull > data to be inserter into a new system that is being built with Python. > > I'm only interested by a tiny fraction of the legacy data and I'm > wondering if it's possible to specify constraints to the mapper do > that > > Obj.query() > > would only fetch rows with col_a == foo and col_b == bar. > > I know how to do that for a field of the object with > > relation(..., primary_join=...) > > How would I do that at the object level?
A couple approaches come to mind: - map Obj to a select() with the restrictions baked in - use Query(obj).select_from() with a restrictive select Making a custom Obj.query property that puts select_from on the query by default is pretty easy too. --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
