On Feb 26, 2009, at 1:29 AM, 一首诗 wrote:
> > The document says: > > ==================================================== > Expunge removes an object from the Session, sending persistent > instances to the detached state, and pending instances to the > transient state: > > ==================================================== > > I hoped that if an instance was expunged from a session, I might use > it safely as a container of some temp data without fearing trigger any > database query. > > But I found that if an object is 'expunge'd , it's properties will > not be accessible anymore. > > So, when should we use expunge? Or it is kept for sqlalchemy inner > use only? you can reattach the object to a session later if you need it to be part of a transaction again. it can be used for caching scenarios, for example. But I agree most reasonable applications probably won't use expunge() very much. --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
