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How to recind SQL_Lookup() Function

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  • How to recind SQL_Lookup() Function

    Hi all,

    Part of an application I am building includes a UX for technicians to use to perform vehicle inspections. They need to enter the odometer reading for each inspection. I want to validate the input to ensure that the reading entered today is at least higher than the reading from yesterday, or the last known reading. I was thinking of using the SQL_Lookup function to get the information from the vehicles table. Here are my questions?

    1. Is there a way to force the SQL_Lookup() Function to include the odometer reading and only return that value
    2. Where would be the best place to test? Do I do it immediately after the user inputs the odo reading or wait and do in in the onDialogValiadate

    Is there a better way?

    Thanks

    Darren
    Last edited by PhotoHog; 03-01-2016, 10:35 AM. Reason: Typing error

  • #2
    Re: How to recind SQL_Lookup() Function

    1) Is your function call returning the most recent odometer reading along with other fields (columns) in the table? If so then you can control which fields are returned by the 4th parameter - "result_expression".

    Is your function returning odometer readings from multiple records? If so (which I suspect is the case here if you are reading a history table), then try the second function shown below, SQL_GET_VALUES. With that function you would have to try setting the descending order parameter to true (.T.) and setting the limit filter to 1 and specify a filter on vehicle ID.

    A value = sql_lookup(C connection ,C table ,C filter, C result_Expression [,SQL::arguments arguments ] )
    c Values = sql_get_values(Connection as A, table as c, filter as c, result_expression as c [, flagDistinct as L [, Limit as n [, flagDescendingOrder as L [, arguments as sql::arguments ]]]])

    2) Without knowing more (like, when the program knows what vehicle is being dealt with), this question cannot be answered. But the safest thing to do is to always validate on the server side. If you can or want you can try throwing in on the client-side too, it's just a matter of timing.

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    • #3
      Re: How to recind SQL_Lookup() Function

      This quick Video may help.

      Also the demo UX

      Peter

      Play Video

      WhoIsTheCustomer.a5wcmp
      Insanity: doing the same thing over and over again and expecting different results.
      Albert Einstein, (attributed)
      US (German-born) physicist (1879 - 1955)

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