Thanks, but I don't see how that's relevant. Like I said, the ordering of an object's key has no correlation to an object's date.
I'm not trying to simply page. That's trivial using the method listed in your link. What I'm trying to do is page through a set of objects limited by a date range. Chris 2009/4/19 秦锋 <feng.w....@gmail.com>: > > CHeck this: > http://google-appengine.googlegroups.com/web/efficient_paging_using_key_instead_of_a_dedicated_unique_property.txt?gda=7FbhWXcAAACSStSWrftt07H4FK2Rtvurv5Qi9dmYyYZMEnTZCjCsYQQgER4RQV57mxjvIzAWBZmQ3TeCdbqm30Qz_AwgYlIpRbcWRj3jGGBm-fgbnPJIYc4-hXRRmo3Xgj6KgtSLBeZ45alvcyXc30EbEX-RNDZveV4duv6pDMGhhhZdjQlNAw > > On 4月19日, 下午12时32分, Chris <chriss...@gmail.com> wrote: >> I have the model: >> >> class Record(db.Model): >> date = db.DateProperty() >> >> Over 1000 Record instances may contain the same date value. The >> instances are also not created in the order of their dates. >> >> I'm trying to query all instances whose date is within a given range. >> I need to be able to query sets larger than the default max of 1000. >> >> I was thinking of doing something like: >> >> Record.all().filter('date >', startDate).filter('date <', endDate) >> >> But this would limit me at most to the first 1000 records. How would I >> get the next 1000 records, maintaining the range query? I can't use >> the last date value from the previous query as the startDate for the >> next query, since there's no guarantee that the date value has >> changed. For example, I could have 2000 instances with the date >> 2008-1-1, so the first and second query sets have identical filter >> parameters. >> >> Intuitively, I could accomplish this by simply filtering on the >> previous key value (e.g. .filter('key >', lastKeyValue)). >> Unfortunately, App Engine currently prohibits filtering with >> inequality operators on more than one property. >> >> Am I correct in understanding that there's essentially no way to query >> all instances within a specific date range, due to this limitation? >> >> This issue keeps coming up for me, and has been a huge deal-breaker in >> a lot of potential projects I've been working on for App Engine. Any >> advice on how I could work around it would be appreciated. >> >> Chris > > > --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
