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Complicated data validation

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  • Complicated data validation

    I am working with a client on a database applicateion. I need a complicated validation for their application that will need to involve a SQL query. Currently I have a dialog entry screen that is triggered on entry or edit. I assume that I can write either custom javascript or xbasic to do what I need but that is honestly a bit over my head.

    The validation needs to look at three fields on the entry screen and determine if that combination already exists or is unique. My Idea was to put code in the validation portion of the third field that would do a sql query and see if there were any records returned in the resultset. If there were a record the validation would fail with a message. In this case I need to have a unique combination of DevelopmentName, Unit Number and Time Period. Only one record can exist in the development for the unit number and time period.

    This table is used for 8 developments and only two of them require this validation on the record.

    I have been combing documentation and looking at examples in the client side and server side functions but haven't come up with anything to help.

    I have developed this application without need for any real coding just standard Alpha 5 web components so I am really new to having to write javascript or xbasic.

    I did have to write a conversion routine in xbasic to convert data from old system to MS Sql database but not part of a validation.

  • #2
    Re: Complicated data validation

    The easiest way to validate 3 fields is to Concatenate them in a redundant field. It drives purist nuts but is simple.

    Field 1 =abc
    Field 2 = 999
    Field 3 = xyz

    I have edited this 3 times now as some characters are not allowed.

    Field 4 which is Calculated = abc999xyz
    Set it as Unique or Primary and it will trap dupes.
    See our Hybrid Option here;

    In fairness to alcohol, I have done some stupid things when I was sober too!


    • #3
      Re: Complicated data validation

      Here is a simple option if you are working with UX controls (code is just taken from other examples - write your own):

      Create a hidden list object. Put it on a panel card that you don't show.
      Add a search part to the list
      Use the three fields as criteria for the search part

      Perform the search example:
      var listObj = {dialog.object}.getControl("LIST1");

      if (listObj) {
      listObj.searchList({searchMode : 'auto', maxRows: 1});

      After the list has been filtered, you can use javascript to determine the number of records:
      var lObj = {dialog.object}.getControl('ID_of_your_list');
      var count = lObj._state.recordCount;

      There are many ways to do what you want. This is just another one.


      • #4
        Re: Complicated data validation

        Hi Ron,

        I'm going to start by saying I haven't tested the code shown below but the idea is
        to use that function to validate the data entered. If the function finds a match
        (development name , unit number, and time period) it will return as true.

        From there, the code is simply if dataexists(control1,control2,control3),"Failed","Passed") .

        I can give a better example if I have actual data to work with.

        function dataexists as l (devname as c, unitnum as c, timeperiod as c)
        dim funcArgs as sql::arguments
        dim funcCN as sql::cn
        set = devname
        set funcArgs.unit = unitnum
        set funcArgs.period = timeperiod
        if sql_lookup(funcCN,<sqlTable>,"develpmentname = :name and unitnumber=:unit and timeperiod=:period","count(*)",funcArgs) > 0 then
        	dataexists = .t.
        	dataexists = .f.
        end function
        Gregg is a great site to test and share sql code