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inventory, writing query

Thread began 12/28/2009 3:23 am by watercolor346374 | Last modified 1/27/2010 3:45 pm by watercolor346374 | 6724 views | 21 replies

watercolor346374

inventory, writing query

Hi,
Once a purchase is made, I want the quantity to be subtracted from my inventory table. My table is set up with inventoryid, prodid, catid, size(if present) and quantity. All products are represented in this table. If I were not working with recordsets and just doing the script with php I would use the query:
$query = "UPDATE inventory set inventory = inventory - $inventory WHERE inventoryid = $inventoryid";
$result7b = mysql_query($query) or die(mysql_error());
and this would update my inventory.
This does not work in my confirm script. I have set up the following rs in the confirm script:
mysql_select_db($database_connMegan, $connMegan);
$query_rsInventory = "SELECT * FROM inventory INNER JOIN products ON products.prodid = inventory.inventoryid";
$rsInventory = mysql_query($query_rsInventory, $connMegan) or die(mysql_error());
$row_rsInventory = mysql_fetch_assoc($rsInventory);
$totalRows_rsInventory = mysql_num_rows($rsInventory);
and the following session:
<?php
if (!session_id()) session_start();
if($_SERVER["REQUEST_METHOD"] == "POST") {
$_SESSION["stock"] = "quantity= quantity- $quantity";
}
?>
How do I write the query, so that the quantity is subtracted on product purchase.
Thank you

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