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Filter Expression Problems

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  • Filter Expression Problems

    I have researched the Alpha message board and the learn alpha.com site for examples that would solve my problem.

    I have simple set, parent="customer.dbf", child="invoice_no", records are linked one to many using the customer_id field which is the same format in both tables.

    I am trying to use the "tablesum" function to total the value of all invoices for the "customer->customer_id" value that is displayed on screen.tablesum("invoice_no","invoice_no->customer_id=customer->customer_id","invoice_total").

    I have tried, I believe every possible combinations of "'s, +'s and 's in the filter expression to get this to work.

    The results are always the same error messages, "expected value", "filter not logical expression", or "'customer->customer_id' not found"

    If I substitute a value (ie:217) in the filter in place of
    "customer->customer_id", the function works fine.

    Can anyone provide in site into the correct syntax?

  • #2
    RE: Filter Expression Problems

    Just a first quick glance

    tablesum("invoice_no","invoice_no->customer_id=customer->customer_id","invoice_total").

    The documentation shows this as

    tablesum("invoice_no.dbf","invoice_no->customer_id=customer->customer_id","invoice_total").
    There can be only one.

    Comment


    • #3
      RE: Filter Expression Problems

      But you said it worked for specified values, so that can't be it.
      There can be only one.

      Comment


      • #4
        RE: Filter Expression Problems

        Stan

        Yes, when a value is substituted for the field "customer->customer_id", the filter works wheither the search table is identified as "invoice_no.dbf" or just "invoice_no".

        thanks for your interest

        Comment


        • #5
          RE: Filter Expression Problems

          Mike,

          Invoice_no.dbf (within the scope of tablesum() has no idea about the set or it's structure or the database customer. Thus you can not reference customer->customer_id in the filter expression. You can do this (assuming character type);

          screen.tablesum("invoice_no","invoice_no->customer_id='"+customer->customer_id+"'","invoice_total")

          Let's say the customer_id is "123456". The filter evaluates to an expression that looks like

          "invoice_no->customer_id='123456'"

          If it is a numeric field, then it would look like this

          screen.tablesum("invoice_no","invoice_no->customer_id='"+LTRIM(STR(customer->customer_id))+"'","invoice_total")

          P.S. DBSUM() would be alot faster.

          Regards,

          Ira J. Perlow
          Computer Systems Design & Associates
          [email protected]
          Regards,

          Ira J. Perlow
          Computer Systems Design


          CSDA A5 Products
          New - Free CSDA DiagInfo - v1.39, 30 Apr 2013
          CSDA Barcode Functions

          CSDA Code Utility
          CSDA Screen Capture


          Comment


          • #6
            RE: Filter Expression Problems

            Ira

            Thanks for your response. I pasted your expression into my calculated field. This time when I pressed "evaluate" I did not get the error messages as before, but did get "screen not found".

            I went ahead and checked it in the form view, but the only information it showed in the field was the name of the calculated field. Have I missed something, should the form name be inserted, etc?

            I did build an expression using dbsum and it worked fine. The reason I would like to be able to use "tablesum" is that I ultimately want to check for a date range as well.

            Thanks

            Mike Walsh

            Comment


            • #7
              RE: Filter Expression Problems

              Mike -
              For what it is worth I will sometimes split the tablesum over two fields. One for the filter, one for the tablesum. This way I can tinker with the " ' "s in a filter, evaluting the expression so I get the right result. Especially this is handy when you throw in date ranges or more complex filters. Of course, as Ira notes, they are not fast... But they do let me simply get the job done and not have to sweat out the better database design the way I SHOULD.

              Comment


              • #8
                RE: Filter Expression Problems

                Mike,

                Tablesum() is a function that is not a form or table method.

                You can say things like

                variablename=tablesum(...)

                Regards,

                Ira J. Perlow
                Computer Systems Design & Associates
                [email protected]
                Regards,

                Ira J. Perlow
                Computer Systems Design


                CSDA A5 Products
                New - Free CSDA DiagInfo - v1.39, 30 Apr 2013
                CSDA Barcode Functions

                CSDA Code Utility
                CSDA Screen Capture


                Comment


                • #9
                  RE: Filter Expression Problems

                  Stephan

                  I don't understand what you mean "split the tablesum over two fields.


                  Thanks

                  Mike

                  Comment


                  • #10
                    RE: Filter Expression Problems

                    Mike:

                    Why don't you simply drag a New Calculated Field from the toolbar on to the form, give it a name, tell it to total the records in the embedded browse and use the "Advanced" button to make sure that the grouping definition is exactly as you want it. A5 will do the formula for you. Much simpler than any other method.

                    Finian
                    Finian

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