And there is a get_or_insert() method. I guess it's waiting for active transactions to be completed and could be used for synchronization. -- Alex http://sharp-developer.net/
On Dec 12, 8:07 pm, ryan <[email protected]> wrote: > if you create an entity with the same key as an existing entity, e.g. > you do Foo(key_name='bar').put() in one request, then you do the same > thing in another request, the second put() will overwrite the first. > > if this happens in two concurrent transactions and they collide, one > of the transactions will retry and do its put() again, overwriting the > first one. > > if the put()s are outside transactions, it's much less likely that > they'll collide. it's still possible that the datastore could attempt > to perform those writes at the same time, but it's much less likely. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~----------~----~----~----~------~----~------~--~---
