/**
  * Insert batch statement
  *
  * Generates a platform-specific insert string from the supplied data.
  *
  * @param	string	$table	Table name
  * @param	array	$keys	INSERT keys
  * @param	array	$values	INSERT values
  * @return	string|bool
  */
 protected function _insert_batch($table, $keys, $values)
 {
     // Multiple-value inserts are only supported as of SQL Server 2008
     if (version_compare($this->version(), '10', '>=')) {
         return parent::_insert_batch($table, $keys, $values);
     }
     return $this->db->db_debug ? $this->db->display_error('db_unsupported_feature') : FALSE;
 }