private function _countObjectsInCollection()
    {
        $select = Statement::get(
            'GET_COLLECTION_OBJECT_COUNT',
            [
                '@collection' => $this->_name
            ]
        );
        $count = $this->_connector->query($select)->fetch();
        if ($count) {
            return (int) $count[0];
        } else {
            return 0;
        }
    }