public function getMultiLength($multiSqlStmt, $fieldsName)
 {
     \System\database\MultiBaseTable::setMultiSqlStmt($multiSqlStmt);
     $length = \System\database\MultiBaseTable::getMultiListLength($fieldsName);
     if (\System\Entrance::config('IS_DB_DEBUG') == true) {
         sqlDebugLog(\System\database\MultiBaseTable::$lastSql, \System\database\MultiBaseTable::$error);
     }
     return $length;
 }