I am currently trying to update my database var by adding 1 to my entries variable each time someone enters the same Voucher_ref number

this is my code but its not working
HOW DOES ONE ADD TO A VARIABLE IN YOUR DATABASE THROUGH DREAMWEAVER UPDATE
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if ((isset($_POST["MM_update"])) && ($_POST["MM_update"] == "form1") {
$updateSQL = sprintf("UPDATE competition SET entries = entries + 1 WHERE voucher_ref=%s",

GetSQLValueString($_POST['voucher'], "text");

mysql_select_db($database_octoblu, $octoblu);
$Result1 = mysql_query($updateSQL, $octoblu) or die(mysql_error());
}

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Hi
I think you can do that directly in sql without having to read the actual values, something like this will do it . . . .

UPDATE table_name SET column_name = column_name + 1 WHERE <where_condition>;