/**
  * Seek on result
  *
  * @param int $offset
  * @return bool|void
  */
 public function seek($offset = 0)
 {
     if ($offset < $this->count()) {
         if ($r = $this->adapter->data_seek($this->result, $offset)) {
             $this->current = $this->adapter->fetch_assoc($this->result);
             return $r;
         }
     }
     return false;
 }