问奇怪的PHP错误:函数无法识别自己的参数

EN

  public function updateCustomerInternetBanking($value, $column_to_go_by)
  {
    $sql = "
      UPDATE customer c
        JOIN account_import ai ON c.account_import_id = ai.id
        JOIN generic_import gi ON ai.generic_import_id = gi.id
        JOIN import_bundle ib ON gi.import_bundle_id = ib.id
         SET has_internet_banking = 1
       WHERE c.".$column_to_go_by." = ".$this->quote($value)."
         AND ib.id = ".$this->quote($this->getId())."
    ";

    $conn = Doctrine_Manager::connection();
    $conn->execute($sql);
  }

PHP Notice:  Undefined variable: column_to_go_by in /var/www/mcif/lib/model/doctrine/ImportBundle.class.php on line 655