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How to Update Inventory in Mysql?

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  • How to Update Inventory in Mysql?

    In a ux component, once a user clicks the save button to save the order header and order detail, how do I update the inventory by lessening the qty sold to the current item inventory? Can anyone provide a sample of this using MYSQL database. Tia

  • #2
    Re: How to Update Inventory in Mysql?

    ideally, you do not keep quantity_on_hand totaled in your table since it can be calculated on the fly. most people will have a total number that total of received + on_order + sold + sale_pending as quantity_available
    you can eliminate some of the fields if not needed, sold and sale pending are obviously negative numbers, they will all be in one table called transaction table with a type in or out.
    however you are free to keep the quantity_on_hand as a number in your inventory if that is your style.
    consider using trigger after insert into the table that deals with your sale.

    a general format of the trigger in your sale_transaction table will be

    UPDATE inventory
    SET qty_on_hand = qty_on_hand - NEW.qty_sold
    WHERE id = New.item_id;
    where inventory is your inventory table
    item_id is foreign key field in your sale_transaction table.
    qty_sold is self explanatory.

    there are many articles on constructing triggers available, if you google MySQL triggers. please refer to them to correct any discrepancy in the code to suit yours.
    Last edited by GGandhi; 11-06-2014, 07:47 AM.
    thanks for reading


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    • #3
      Re: How to Update Inventory in Mysql?

      Thanks so much Govindan for sharing your idea and recommendation. Based on your suggestion, you mean everytime I would want to know the Inventory of every item then I will run a query on the sold items table, received items table, transferred items table , Back order table etc and add , subtract to get the total? I think the disadvatage of this is that you have to keep all the sold items, received items etc , meaning you cannot delete the transaction of every item, and what if there would be millions of transactions for sold and received? and for triggers, based on recommendations of experts on sql server that never ever use triggers as much as possible because it would be very very slow if there are hundreds of users using the app, is it very fast on MYSQL?


      • #4
        Re: How to Update Inventory in Mysql?

        I agree with gandhi. however if your tables get big then just use a stored procedure to generate sub totals and delete the rows that have been totaled. MySQL does not take long to process a million rows if it is properly indexed. As to triggers you are going to be paying hundreds of dollars a month in hosting before you notice a performance drop with triggers.