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How to create virtual field for detail display

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    How to create virtual field for detail display

    I would like to create a virtual field on my detail display. I want to compute and display the AGE based on the DOB which is in the source table. I cannot create edit the table structure and create a calculated field as it is a linked table (to access now eventually to Mysql). so how do I add fields such as this?

    Bob
    Bob Alston
    -------------------------------------------------------------------
    http://webpages.charter.net/bobalston/bob1.htm
    Alpha five v11 Tips

    #2
    Re: How to create virtual field for detail display

    maybe I'm not understanding, but....

    at Grid.Query , after you have the connectionName, you can base the query on:
    Table/View
    SQL Select Statement
    Stored Procedure

    I would select Sql Select Statement, and use the builder to get the table, but add in a field that does the calculation you need.
    MSQL since 2010
    A5V11 since Feb 2012

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      #3
      Re: How to create virtual field for detail display

      Great. Thanks. so Simple but I never thought of it.

      Guess I will have to find out how/what/if there are functions I can use in the sql as the calculation of age is not trivial.

      bob
      Bob Alston
      -------------------------------------------------------------------
      http://webpages.charter.net/bobalston/bob1.htm
      Alpha five v11 Tips

      Comment


        #4
        Re: How to create virtual field for detail display

        perhaps you need something more sophisticated, but try this for starters

        DateDiff (yy , StartDate, EndDate)

        that will give you the years between the starting date (presumably DOB) and your ending date (presumably now, so that's GetDate()

        So it's:

        select DOB , dateDiff(yy,DOB,getdate() ) as Age from TableBlah


        if you need years and days, you'll need to take the expression up a notch;. basically you replace the yy with dd, divide the total by 365 - I'd have to think a bit..
        MSQL since 2010
        A5V11 since Feb 2012

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          #5
          Re: How to create virtual field for detail display

          Thanks. That works slick.

          And it is automatically recalculated after the record is updated.


          slightly revised syntax:
          SELECT *, yearsbetweendates(DOB, currentdate() ) AS Age FROM tbl_Client_Data

          Works slick. thanks again!!!
          bob
          Last edited by bobalston; 02-27-2012, 01:22 AM.
          Bob Alston
          -------------------------------------------------------------------
          http://webpages.charter.net/bobalston/bob1.htm
          Alpha five v11 Tips

          Comment


            #6
            Re: How to create virtual field for detail display

            I think it's easier than you're thinking....

            I just grabbed one of my tables that has a date

            I made an updateable grid

            I added the column to the query -
            datediff(yy, DOB, GetDate()) as Age

            I set age to be a label (not a text box)

            I did a live preview
            I changed a date
            I saved the row; the age updated

            OR - are you asking for the age to update before you submit the row?

            actually - you can probably do this a number of other ways too - this is just the way I'd do it since I'm comfortable with SQL
            MSQL since 2010
            A5V11 since Feb 2012

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