it is supported ,use it.... u can find several posts about it in this group joe
On Apr 28, 4:47 am, Chau Huynh <[email protected]> wrote: > On Wed, Apr 28, 2010 at 5:24 AM, Joe Fawzy <[email protected]> wrote: > > select count (this) from User > Since when app engine support group operation? ;-) > > > > > > On Wed, Apr 28, 2010 at 5:24 AM, Joe Fawzy <[email protected]> wrote: > > Hi all > > i am using JDO and i want to count the number of entities so which is > > more efficient > > using a count quert, eg: > > select count (this) from User > > or key only query > > select id from User > > then get the count using resultList.size(); > > > by the way , i know that the recommended way on appengine is to > > precompute but this cannot be done in my case > > thanks > > Joe > > > -- > > You received this message because you are subscribed to the Google Groups > > "Google App Engine for Java" group. > > To post to this group, send email to > > [email protected]. > > To unsubscribe from this group, send email to > > [email protected]<google-appengine-java%2B > > [email protected]> > > . > > For more options, visit this group at > >http://groups.google.com/group/google-appengine-java?hl=en. > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine for Java" 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 > athttp://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" 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-java?hl=en.
