A query has to specify an entity kind as its minimum parameter, and then doing a count and seeing if its equal to zero for a known entity kind would be the best way.
On Mar 13, 1:44 pm, vchalmel <[email protected]> wrote: > hi ! > > I want to set up an initialization script, and i must, in a first > part, check if the appengine datastore is empty. > I tried to send a query, with : > > query.setUnique(true); > if(query.execute()==null) > > But it throws a null pointer exception. > > How to check that my datastore is empty ? -- 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.
