On Tue, Dec 1, 2009 at 3:21 PM, yejun <yej...@gmail.com> wrote: >> id is not the primary key of MessageS, but a 'long' field, _unique_ in >> each entity (so it maps 1-to-1 with the entities). Note: such a query >> doesn't require a specific index. > > Why "such a query doesn't require a specific index"?
I mean, according to the documentation, you can execute such a query without building an index for it, as App Engine provides automatic indexes in such a case. "App Engine provides automatic indexes for the following forms of queries: - queries using only equality and ancestor filters - queries using only inequality filters (which can only be of a single property) - queries with no filters and only one sort order on a property, either ascending or descending - queries using equality filters on properties and inequality or range filters on keys" My query is of the second type. > There's no such thing as unique constraint on google data store. I don't understand what you mean. -- 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-appeng...@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.
