Low level API has a method to do this, in JDO/JPA simply select only key field in your query.
See http://gae-java-persistence.blogspot.com/2009/10/keys-only-queries.html (from Max Ross, GAE team) for details. Regards Lorenzo On Jul 21, 5:21 am, TL <twl.e...@gmail.com> wrote: > I want to run a query and receive a few keys, which I will delete > afterwards. The problem is that queries return the entire entity, > unnecessary work for the data store and the client (which is also > reflected as slower page performance and higher bills). > All I want from the query is the keys. > > In SQL it would be something like > select t.id from table t where t.column > someValue > > Is there a way to get it using the native API or in another way? I > imagine that JPA will do the same if the underlying libraries can only > return full records. -- 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 google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
