php PDO Á´½Ó mysql ×î¼òµ¥ ʵÀý

define("DB_SERVER","127.0.0.1");
define("DB_PORT",3306);
define("DB_CATALOG","uab");
define("DB_USERID","root");
define("DB_PASSWORD","");
$dsn="mysql:host=".DB_SERVER.";port=".DB_PORT.";dbname=".DB_CATALOG;
self::$__PDO=new PDO($dsn, DB_USERID, DB_PASSWORD);
//support long connection
self::$__PDO=new PDO($dsn, DB_USERID, DB_PASSWORD, array(PDO::ATTR_PERSISTENT => true));