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Core Business Logic placement

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  • Core Business Logic placement

    I am new to Alpha Five but not to software development and I'm trying to get an idea of the deeper capabilities of Alpha Five V11.

    Where would I put core data business logic to be used by multiple components and pages without having to repeat a call to that functionality? Having it execute simply when a particular data event happens or a data field changes. For example:

    Given I have a ecommerce site, when a customer adds an item to their cart I want the inventory amount to have the same quantity put 'on reserve'.

    I do not want to do this in a grid component because I will have several components that can add items to the cart (normal products, related items, special just for that customer, etc.). I do not want to put it on the database as a trigger because I may have additional business logic that would not work well in SQL. I imagine this will involve XBasic, but where do I put that logic?

    David

  • #2
    Re: Core Business Logic placement

    Depends.

    I have an app with a MySQL back end, and as a result the logic is scattered.

    If the logic is only database, like creating tho one you suggested, then I may create a MySQL trigger that monitors the table and makes changes whenever there is an insert, update or delete. Only issue is you can only have one before and one after trigger for each of insert, update and delete.

    If the logic is heavily database and used in more than one place, I create a MySQL stored procedure or stored function, then invoke it with the conn.execute(call...). Those are very fast to execute.

    If the logic includes a lot of computation or data manipulation that is not primarily database, then I create an Alpha UDF (User defined function). You build those in the "Code" tab of the desktop control panes, then combine them in a ...aex library which you can publish as part of the web publish routine.

    Otherwise as you suggest, it gets programmed over and over in the various web grid events and callbacks.
    Pat Bremkamp
    MindKicks Consulting

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