public int count ( ) { Integer result = null ; if ( result == null ) { SimpleQuery q = this . isKeysOnly ( ) ? this : this . clone ( ) . keysOnly ( ) ; result = getDatastoreService ( ) . prepare ( q . getQuery ( ) ) . countEntities ( fetchOptions ) ; } return result ; }
Counts the number of instances returned from this query . This method will only retrieve the matching keys not the entities themselves .