update multiple columns

[khaja.jab]

i want to update my columns with different content.

This is my table structure

+----+---------+
| id | content |
+----+---------+
| 2 | abc |
+----+---------+
| 14 | def |
+----+---------+
From my code i am able to update only single column only.
can anyone help me please...

<?php
$hostname = "localhost";
$username = "";
$password = "";
$database = "";

// Connect to the database
mysql_connect($hostname, $username, $password) OR DIE("Unable to connect");
mysql_select_db("$database") or die("Unable to select database");

if (isset($_POST['ud_date'])) {
   $query = sprintf("UPDATE test_mysql SET content='%s' WHERE id=%d",
                mysql_real_escape_string($_POST['ud_date']),
                2);
   if (mysql_query($query)) {
       echo 'update query succeeded';
   } else {
       else echo 'update query failed';
   }
} else {
   echo 'please submit the form';
}