final public function truncate() {
      $this->connection();
      $this->sql = "TRUNCATE TABLE {$this->table};";

      if($this->driver=='firebird'||$this->driver=='sqlite')
         $this->sql = "DELETE FROM {$this->table};";

      // $this->fetch(false);
      $this->fetch();

      return $this->resultset?true:false;
   }