How to get the number of rows in a table in a Datastore?

Question

In many cases, it could be useful to know the number of rows in a table (a kind) in a datastore using Google Application Engine.
There is not clear and fast solution . A

Answer 1

You can count no. of rows in Google App Engine using com.google.appengine.api.datastore.Query as follow:

   int count;   
   Query qry=new Query("EmpEntity");   
   DatastoreService datastoreService = DatastoreServiceFactory.getDatastoreService();
   count=datastoreService.prepare(qry).countEntities(FetchOptions.Builder.withDefaults());