On Thu, Feb 12, 2009 at 7:50 AM, Neversummer <wrigh...@gmail.com> wrote:
> I want to get a total (sum) from an property on a given entity. I know > that sum() is not supported. Is the best method to query for all > records on the entity in question and work through a loop adding each > records value (the value of the property in question) to a total > variable? Don't do that. That won't scale. Instead, adjust the sum on a separate counter as you insert/change/remove entities that would affect the sum. As Barry said, search for "sharded counter", or look at Brett Slatkin's Google IO talk videos. Dave. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~----------~----~----~----~------~----~------~--~---
