復制代碼 代碼如下:

<?
$q = "SELECT `id` FROM `users` WHERE `username`= ' " .$_GET['username']. " ' AND `password`= ' " .$_GET['password']. " ' ";
?>

復制代碼 代碼如下:

<?
$q = "SELECT `id` FROM `users` WHERE `username`= ' " .mysql_real_escape_string( $_GET['username'] ). " ' AND `password`= ' " .mysql_real_escape_string( $_GET['password'] ). " ' ";
?>

復制代碼 代碼如下:

<?
//connection
$database = mysql_connect("localhost", "username","password");
//db selection
mysql_select_db("database", $database);
$q = mysql_query("SELECT `id` FROM `users` WHERE `username`= ' " .mysql_real_escape_string( $_GET['username'] ). " ' AND `password`= ' " .mysql_real_escape_string( $_GET['password'] ). " ' ", $database);
?>