function _SQLConnect($dbtype, $dbhost, $dbuser, $dbpass, $dbname, &$conn)
 {
     parent::_setError(ERRORINFO, -1, -1, __METHOD__ . ' start', false);
     $return = false;
     if ($this->_validateSupportedDatabase($dbtype)) {
         $dsn = "{$dbtype}://{$dbuser}:{$dbpass}@{$dbhost}/{$dbname}";
         $conn = ADONewConnection($dsn);
         if (is_object($conn)) {
             $return = true;
         }
     }
     return $return;
 }