ผมต้องการ update DB หลายๆ record พร้อมๆกันครับ รบกวนด้วยครับ

$id=$_POST['id'];
$readStatus= '1';
// Decode
$de_user_id = (isset($_GET['touserid'])) ? $_GET['touserid'] : '';
$_SESSION["touserid"] = base64_decode($de_user_id);
					
$touserid = $_SESSION["touserid"];
$fromuserid = $_SESSION["UserID"];

$strSQL = "Select fromuserID, touserID FROM haanee_privatemessages WHERE touserID = '$fromuserid' AND readit = '0' ";	
$objQuery = mysql_query($strSQL);
$objResult = mysql_fetch_array($objQuery);
$count_row = mysql_num_rows($objQuery);
	for($i=0;$i<$count_row;$i++){
		$strSQL = "UPDATE haanee_privatemessages SET readit = '$readStatus' WHERE pmID = '$id' ";
		$objQuery = mysql_query($strSQL);
	}