2009/6/24 Ian Lewis <ianmle...@gmail.com> > If you used numeric keys then you can do pagination by key in order to get > all items from the datastore and count them. Basically this involves > querying the datastore several times, each time filtering on keys that are > greater than the highest key from the results of the previous query. You > won't want to do this often as it will likely take to long to do it in a > single request so you'll probably only want to do it once and store the > value in a counter for later use. > > If you are using key names and don't have a way of pulling unique data, say > via a create time DateTimeProperty, then I'm afraid you're kind of out of > luck. You could try different filters and pull the data locally and compare > the keys to get unique entities but that sounds like a serious pain. Someone > else might have a better idea in this case.
Pagination by key works regardless of if you're using key names or IDs. -Nick Johnson > > Ian > > On Wed, Jun 24, 2009 at 6:52 AM, alf <alberto....@gmail.com> wrote: > >> >> hi, >> >> assuming you have more than 1000 rows and you have no counter store in >> a entities what is the best away to know how many rows has a entitie. >> >> I think is better time to time request numbers of rows per entity to >> has a incremental counter and always have in mind insert and delete >> >> many thaks. >> >> > > > -- > ======================================= > 株式会社ビープラウド イアン・ルイス > 〒150-0012 > 東京都渋谷区広尾1-11-2アイオス広尾ビル604 > email: ianmle...@beproud.jp > TEL：03-5795-2707 > FAX：03-5795-2708 > http://www.beproud.jp/ > ======================================= > > > > > -- Nick Johnson, App Engine Developer Programs Engineer Google Ireland Ltd. :: Registered in Dublin, Ireland, Registration Number: 368047 --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
