MDB2 & mysql escape string ?

Hello everybody, thank you for letting me post onto your forums. This is my first project with PEAR & MDB2.

I don't really understand how to secure a variable to use within a database query string, like with mysql_real_escape_string.
Would the following code be considered as sane please ?

$res_username_password = $objMDB2->query('SELECT `iUserID`, `sPassword` FROM `users` WHERE `sName` = '.$objMDB2->quote($_POST['s_password'], 'text'));

Thank you in advance for your help

That looks safe.

I use $objMDB2->escape( $input_here );

im not sure what the difference is....