提取ecshop的mysql类的方法

<?php
header("Content-Type:text/html;charset=utf-8");
date_default_timezone_set("Etc/GMT-8");
error_reporting(E_ALL ^ E_NOTICE);
define('IN_ECS', true);
define('EC_CHARSET', 'utf-8');
define('ROOT_PATH', dirname(__FILE__).'\..\\');
define('DATA_DIR', 'data');
$db_host = "localhost:3306";
$db_name = "test";
$db_user = "root";
$db_pass = "";
require(ROOT_PATH.'Classes/cls_mysql.php');
$db = new cls_mysql($db_host, $db_user, $db_pass, $db_name);
?>

<?php
global $db;
require_once 'Classes/connfig.php';
$sql = 'SELECT id FROM table WHERE uid='1';
$row = $db->getOne($sql);
echo $row;
?>