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Set session variable to current record number

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    #1

    Set session variable to current record number

    (Please note that I am referring to grid components and A5W pages running on the WAS.)

    Objective: to set the value of a numeric session variable to the value of the current record number in the active table.

    Structure: In my first A5W page (Page 1.a5w) I have a grid that is set to "Add Records Only." After a new record has been successfully entered (upon a successful Submit operation), Page 1.a5w then redirects to a second A5W page (Page 2.a5w). Page 2.a5w contains a grid that is set to "Allow Update." This grid on Page 2.a5w ONLY updates records in the table-it does not insert or add new records.

    Page 2.a5w contains a filter that selects a record equal to the number of the last record that was added in Page 1.a5w. That filter value in Page 2.a5w is a numeric session variable (session.targetRec_N) that was set in Page 1.a5w.

    Everything is working fine except...I cannot successfully set the value of session.targetRec_N to the current record number. In the CanInsertRecord event of the grid on Page 1.a5w, I currently have the following code:

    tbl=table.current()
    recnum=tbl.recno()
    session.targetRec_N=recnum

    If I comment out the code above and add a line directly below it that assigns a constant to session.targetRec_N (e.g., session.targetRec_N=150) everything works as expected-i.e., the session variable is successfully passed to Page 2.a5w and it is correctly used in the filter expression. So I know the filter on Page 2.a5w is correct and I also know that session.targetRec_N is being passed to Page 2.a5w.

    With what I have now, Page 2.a5w always updates Record = 1 in the table. I just need to set the session variable to the value of the current record in the table.

    Any suggestion, strategies or insights would be greatly appreciated.
    Tags: None
    #2
    Re: Set session variable to current record number

    I'm not sure where or when the CanInsertRecord fires. But I believe, it cannot detect the current record. This portion of your code cannot work the way you intend within the context of a web page:

    tbl=table.current()
    recnum=tbl.recno()

    Because: the web page is necessarily static and there is no "current" table nor is there a "current" record, nor does the web page no the record # that the server side A5 assigns. The WAS gets the command from the page to write the record, and the server carries it out, but i don't think it works the way your code suggests. I think you have to grab some input value on your web page (like an ID #), pass it to a variable, and then send that filter to your 2nd page.
    Last edited by Peter.Greulich; 12-18-2006, 11:49 PM.
    Peter
    AlphaBase Solutions, LLC

     [email protected]
    https://www.alphabasesolutions.com

    Comment

      #3
      Re: Set session variable to current record number

      Hey Peter, thanks for the response. Let me ask....

      If, as you say, the CanInsertRecord event cannot detect the current record then how does the WAS know which record to insert? Does the WAS simply look up the record count for that table and add "1" to generate the record number for that CanInsertRecord event?

      My question is a bit off topic but I found your remark interesting.

      Richard

      Comment

        #4
        Re: Set session variable to current record number

        Originally posted by rjonas View Post
        Does the WAS simply look up the record count for that table and add "1" to generate the record number for that CanInsertRecord event?
        Richard,

        I believe your statement above is correct. The recod # is automatcially assigned by the dbf engine on the server side. It does not yet exist when you submit the new record. Once the server receives the data, it creates a new record # incrementing by 1, as you say. That is why your code idea won't work - as far as I know. You need to grab some unique value that you are inputting on the web page to do what you want. Having said that, there probably is a way to do what you want, but I'm afraid that I don't have an answer for you. Maybe someone else has?
        Peter
        AlphaBase Solutions, LLC

         [email protected]
        https://www.alphabasesolutions.com

        Comment

          #5
          Re: Set session variable to current record number

          Thanks Peter. I appreciate your time and thoughts.

          Comment

            #6
            Re: Set session variable to current record number

            hi Richard

            just a thought

            if you created a new blank record and then displayed
            the
            Page 2.a5w contains a grid that is set to "Allow Update."
            then you would have the record no and if the user failed to
            submit a proper record simply delete it later
            better for user (1 form to fill in) and you( i form to create)
            i would think

            just a thought
            regards

            martin
            www.jollygreenthumb.com

            Comment

              #7
              Re: Set session variable to current record number

              Thanks Martin.

              Anyone else have ideas or info to offer?

              Comment

                #8
                Re: Set session variable to current record number

                Richard,

                I struggled with the same isue for a while, and finally came to the following conclusion:

                In some cases, I need to update a linking table as well as the table that the grid is based on. In those cases, I use a dialog component for the data entry, then a grid component for editing.

                If I don't have that extra need, then I just use the grid component set to allow both insert and update.

                The closest I came to accomplishing what you are trying is to use a fetch_last() in the edit page to get the last page, but of course, if y are in a multi-user environment, that could fail.

                Pat
                Pat Bremkamp
                MindKicks Consulting

                Comment

                  #9
                  Re: Set session variable to current record number

                  Thanks Pat....I appreciate your time and info.

                  Comment

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