/**
* 静态方法，返回数据库连接实例
*/
public static function getInstance()
{
if (self::$instance == null) {
self::$instance = new MySql();
}
return self::$instance;
}
/**
* Get instance returns the currently instantiated object of this DB class.
* This forces only one connection to the MySQL server
* @return DB object
*/
public static function Instance()
{
global $config;
if (!self::$instance) {
self::$instance = new self($config['database']);
}
return self::$instance;
}
