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Best way to tackle inventory control? I have several ideas...need help.

Thread began 2/17/2010 12:49 pm by sam308940 | Last modified 2/18/2010 11:11 pm by sam308940 | 1115 views | 5 replies |


Best way to tackle inventory control? I have several ideas...need help.

Ok i need to tackle setting up some inventory control - but - im unsure what idea to move forward with. i have items that have both size and color options.

i have 2 tables in the database
1 table is the main product (SHIRT)
1 table is the subitems with the size/color/inventory (Size: LARGE, Color: BLUE, Inventory: 5)

----IDEA 1-------
on the product display page i plan to display only items that have > 0 inventory. My thought was to use a JOIN statement in the recordset to pull info from what has been ORDERED already. IE INVENTORY minus ORDERED = available amount.

My issue here is - HOW do i do the subtraction?
I have used before SUM, MAX, COUNT etc - but how do you subtract? It doesnt seem there is any function called DIFFERENCE.

----IDEA 2-------
another idea was to update the inventory field after the order is placed. (IE have this occur on the success page). However - this seems to be tricky when there is more than 1 item that is ordered. Im stumped as to how i would pull the recordset of multiple items - or do one at a time and have a recordset for each.

I need some guidance on which is the best idea, if there are better ideas, and HOW TO MOVE FORWARD ON WHICHEVER IS THE BEST.

Please assume I am dumb as a rock and give me the extreme basic 123 steps of how I should approach this.

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Eric Mittman

I think you should go with the first idea, doing this via idea 2 would require some hand editing of code.

You would need to craft the query with a join, you can do some math directly in the sql like this:

SELECT (table1.inventory - table2.ordered) AS available_inventory
FROM table1 JOIN table2 ON = table2.foreignkey
WHERE available_inventory > 0

Obviously this is just an example of how you could do this in a query, your query will look different. Please post back with any additional questions that you have about this or any other part.

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i so get it now.
i just couldnt figure out where to put the darn subtraction part!


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Eric Mittman

Nice, always happy to hear the gears turning.

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what i do for inventory control is on the eCart Object i create a new field wich i called Stack then on the Calculations panel i added a new calculation called substractions and placed this formula:

[Stack] - [Quantity] and the output was number so it should be kind of ([substractions] = [Stack] - [Quantity]), then on the product page where i have the add to cart i bind the products stack from the database to the stack column, and after the transaction is done if aproved from credit card, i use a page where i use the display manager again for printing the recipie or bill, but here i have a hidden php code wich i place next to

<p class="eC_ItemLabel"><?php echo $Ecart->DisplayInfo("Name"); ?>

i put

$FinalStack = $Ecart->DisplayInfo("substractions");
$idProduct = $Ecart->DisplayInfo("idPro");
mysql_select_db($database_XX, $YYYY);
$query_substractions = "UPDATE products SET stock = $FinalStack WHERE idPro = $idProduct" ;
$substractions = mysql_query($query_substractions, $YYYY) or die(mysql_error());

so when this page loads it discounts and updates my stacks.

Hope this helps

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sades - thank you.
i like your trick.

i think im going to try my way - only cause its im head as a plan i understand.

but - i might try your way later - so ill keep you as a friend and bug sometime soon. i think your way is actually better than mine. Im on a tight deadline right now, but later when i have more time i think ill shoot for your method.

hope you dont mind if i pick your brain.


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