private function _dumpDatabase($filename, $dbname, $droptable)
 {
     $filename .= ".sql";
     $filename = $this->folder . DIRECTORY_SEPARATOR . $filename;
     $dbconfigList = BizSystem::getConfiguration()->getDatabaseInfo();
     $dbconfig = $dbconfigList[$dbname];
     if (strtolower($dbconfig["Driver"]) != 'pdo_mysql') {
         return;
     }
     include_once dirname(dirname(__FILE__)) . "/lib/MySQLDump.class.php";
     $backup = new MySQLDump();
     if ($droptable == 1) {
         $backup->droptableifexists = true;
     } else {
         $backup->droptableifexists = false;
     }
     if ($dbconfig["Port"]) {
         $dbHost = $dbconfig["Server"] . ":" . $dbconfig["Port"];
     } else {
         $dbHost = $dbconfig["Port"];
     }
     $dbc = $backup->connect($dbHost, $dbconfig["User"], $dbconfig["Password"], $dbconfig["DBName"], $dbconfig["Charset"]);
     if (!$dbc) {
         echo $backup->mysql_error;
     }
     $backup->dump();
     $data = $backup->output;
     file_put_contents($filename, $data);
     @chmod($filename, 0777);
     return $filename;
 }