Updating stock from checkout success page

Hi there,
Could you possibly tell me what code I would need to decriminate the stock level in my database by the ecart quantity field on arrival at the checkout success page, presuming there is one or more items in the cart?

this will take some custom coding to accomplish. in the code examples i give, I am going to use the cart name eCart1, you will need to modify the cart code to match your cart object name.

it will require a recordset, an update behavior and an eCart loop around them.

first, you need to create a recordset to look up the current quntity, assuming the name of the table is "products", the ID columnn is name "productID", and the name of the stock column is "productStock", the recordset query would look like:

SELECT productStock FROM products WHERE productID = paramCartID

in the variables section create a new variable as:
name: paramCartID
type: integer
default value: -1
runTime value: $eCart1->DisplayInfo("ID")


then you need code to set a variable to hold the stock from the recordset minus the quantity in the cart, we'll use a get variable:

<?php $_GET['productStock'] = ($row_recordSetname['productStock'] - $eCart1->DisplayInfo("Quantity")); ?>

on the bindings panel, click the plus button and select URL Variable, set the name to productStock

Now you will need to add an update record behavior.

for the key column, select the productID column, for the valuer, click the lightning bolt and select the ID column from the cart object.

do not set a redirect.

on the second step of the update record wizard, select the productStock column, click the lightning bolt and select the productStock URL Variable.

you then need to add the cart loop around those pieces so the final code has this structure:

<?php
while (!$eCart1->EOF())      {
?>
<product stock lookup recordset>
<set the productStock URL variable
<update record behavior>
<?php
  $eCart1->MoveNext();
}
$eCart1->MoveFirst();
?>

Thats really helpful - thank you so much for your very comprehensive reply.
I've given it a go, but I think I've missed something or got some code snippet slightly wrong. My recordset is inventory. I'm looking up the record via the unique barcode (InvBarcode) and the Stock Field is InvInStock. I also called the url variable InvInStock. My code looks like this, but I'm getting a blank page in the browser. There are server behavious after this in the code, but when I strip this code chunk out the page still works, so I'm guessing its in here somewhere:

<?php
while (!$OkeefeCart->EOF()) {
?>
<?php
$BarcodeParam_rsInventory = "-1";
if (isset($OkeefeCart->DisplayInfo("Barcode"))) {
$BarcodeParam_rsInventory = (get_magic_quotes_gpc()) ? $OkeefeCart->DisplayInfo("Barcode") : addslashes($OkeefeCart->DisplayInfo("Barcode"));
}
mysql_select_db($database_cmsconn, $cmsconn);
$query_rsInventory = sprintf("SELECT * FROM inventory WHERE inventory.InvBarcode = %s", GetSQLValueString($BarcodeParam_rsInventory, "int"));
$rsInventory = mysql_query($query_rsInventory, $cmsconn) or die(mysql_error());
$row_rsInventory = mysql_fetch_assoc($rsInventory);
$totalRows_rsInventory = mysql_num_rows($rsInventory);?>
<?php $_GET['InvInStock'] = ($row_rsInventory['InvInStock'] - $OkeefeCart->DisplayInfo("Quantity")); ?>

<?php
// WA Application Builder Update
if (!$OkeefeCart->IsEmpty()) // Trigger
{
$WA_connection = $cmsconn;
$WA_table = "inventory";
$WA_redirectURL = "";
if (function_exists("rel2abs")) $WA_redirectURL = $WA_redirectURL?rel2abs($WA_redirectURL,dirname(__FILE__)):"";
$WA_keepQueryString = false;
$WA_indexField = "InvBarcode";
$WA_fieldNamesStr = "InvInStock";
$WA_fieldValuesStr = "".$_GET['InvInStock'] ."";
$WA_columnTypesStr = "none,none,NULL";
$WA_comparisonStr = "=";
$WA_fieldNames = explode("|", $WA_fieldNamesStr);
$WA_fieldValues = explode("|", $WA_fieldValuesStr);
$WA_columns = explode("|", $WA_columnTypesStr);

$WA_where_fieldValuesStr = "".$OkeefeCart->DisplayInfo("Barcode") ."";
$WA_where_columnTypesStr = "',none,''";
$WA_where_comparisonStr = "=";
$WA_where_fieldNames = explode("|", $WA_indexField);
$WA_where_fieldValues = explode("|", $WA_where_fieldValuesStr);
$WA_where_columns = explode("|", $WA_where_columnTypesStr);
$WA_where_comparisons = explode("|", $WA_where_comparisonStr);

$WA_connectionDB = $database_cmsconn;
mysql_select_db($WA_connectionDB, $WA_connection);
if (!session_id()) session_start();
$updateParamsObj = WA_AB_generateInsertParams($WA_fieldNames, $WA_columns, $WA_fieldValues, -1);
$WhereObj = WA_AB_generateWhereClause($WA_where_fieldNames, $WA_where_columns, $WA_where_fieldValues, $WA_where_comparisons );
$WA_Sql = "UPDATE `" . $WA_table . "` SET " . $updateParamsObj->WA_setValues . " WHERE " . $WhereObj->sqlWhereClause . "";
$MM_editCmd = mysql_query($WA_Sql, $WA_connection) or die(mysql_error());
if ($WA_redirectURL != "") {
if ($WA_keepQueryString && $WA_redirectURL != "" && isset($_SERVER["QUERY_STRING"]) && $_SERVER["QUERY_STRING"] !== "" && sizeof($_POST) > 0) {
$WA_redirectURL .= ((strpos($WA_redirectURL, '?') === false)?"?":"&").$_SERVER["QUERY_STRING"];
}
header("Location: ".$WA_redirectURL);
}
}
?>
<?php
$OkeefeCart->MoveNext();
}
$OkeefeCart->MoveFirst();
?>

a blank page means a php error. you need to turn error reporting on.

add the following code at line 1:

<?php

error_reporting(E_ALL);

ini_set('display_errors','on');

?>

once we know the error, we can start troubleshooting it.

hmm - well its something in the recordset selection code. I've changed it so it selects the record by ID rather than barcode as I thought this might be giving me the problem, but its still occurring. This is the error report from my apache error log:
PHP Fatal error: Can't use method return value in write context in C:\\wamp\\www\\okeefe\\public_html\\checkout_success.php on line 358

and this is the code chunk to which it refers (line 358 being the 3rd line down):
<?php
$paramInvID_rsInventory = "-1";
if (isset($OkeefeCart->DisplayInfo("InvID"))) {
$paramInvID_rsInventory = (get_magic_quotes_gpc()) ? $OkeefeCart->DisplayInfo("InvID") : addslashes($OkeefeCart->DisplayInfo("InvID"));
}
mysql_select_db($database_cmsconn, $cmsconn);
$query_rsInventory = sprintf("SELECT * FROM inventory WHERE inventory.InvID=%s", GetSQLValueString($paramInvID_rsInventory, "int"));
$rsInventory = mysql_query($query_rsInventory, $cmsconn) or die(mysql_error());
$row_rsInventory = mysql_fetch_assoc($rsInventory);
$totalRows_rsInventory = mysql_num_rows($rsInventory);
?>

ok, just before the recordset code block add this:

<?php $_GET['Barcode'] = $OkeefeCart->DisplayInfo("Barcode"); ?>

then in the recordset, set the runtime value for the paramInvID parameter to use the Querystring variable:
$_GET['Barcode']

Hello dallySP

I followed all the steps of the post to update the inventory of the items in the db but could not.
I looked around the forum eCart but have not found the right solution. Use the eCart 5. You could do? I have to create inventory table in MySQL? Or I can just work with the column ProductStock in the table Products? I have to put the Recordset and the update on that page?
Please, if you have the solution send me an email please. I am a long time trying to do this and when I bought the eCart thought this function was native but found that it is not.
Thank you for your attention.

you can use the product stock column of the products table for this.

where to put the code for this depends on the gateway you are using.

for most local checkout methods, this code can go on the confirm page. If you would like one on one help with accomplishing this, we can assist you in a screen sharing using a Premiere support appointment.

Thanks! Jason

you're welcome.