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Sum of a child table field in the parent table

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    Sum of a child table field in the parent table

    What is the best way to get the sum of the values of a field in a child table into a field in the parent table without using the posting field rule? Is there a function similar to the total() function I can use in the parent table, but faster than dbsum() or totalsum().

    Thanks
    Lee Goldberg
    Software Development and Sales
    Shore Consultants Ltd.
    [email protected]
    www.shorecon.com

    #2
    Re: Sum of a child table field in the parent table

    You could do it in the OnSave event for the form. If your calculated total is displayed then that object has a value. Try a table.change_begin() to pass that value to the field you want to update.

    OnSave

    dim tbl as p
    dim vTotal as n
    dim commit_flag as L
    vTotal = tot_calc_field.value
    tbl = table.current() 'should always be the header or parent table
    on error goto ERRMSG
    commit_flag =.t.
    tbl.change_begin()
    tbl.your_field_name = vTotal
    tbl.change_end(commit_flag)
    end
    ERRMSG:
    commit_flag = .f.
    RESUME NEXT
    Robin

    Discernment is not needed in things that differ, but in those things that appear to be the same. - Miles Sanford

    Comment


      #3
      Re: Sum of a child table field in the parent table

      Thanks Mo, that is actually what I currently have in place, however, it can't be form dependent because, well it's a complex explanation, but basically, I have it set up so that the value of the field I want to sum is dependent upon values in parent and grandparent tables, and when those values change then the values in the child table change and the total of the values needs to change as well.

      I want to move away from data entry on a form with a large set because it can be sluggish so I want to break the form down meaning that I can no longer use this form dependent process. I also used the posting field rule for a while too but soon realized that it was not catching a change in value when the child table value changed due to a variable it was dependent upon is another table.
      Lee Goldberg
      Software Development and Sales
      Shore Consultants Ltd.
      [email protected]
      www.shorecon.com

      Comment


        #4
        Re: Sum of a child table field in the parent table

        Here is a sample.

        If you goto the worksheet form and add items to the ws_items table. you will see that the total_bill field posts to the total_bill field for the worksheets table. Then the worksheets->total_bill is supposed to post to the invoice->inv_amt and the project->tot_wks fields but it does not.
        Lee Goldberg
        Software Development and Sales
        Shore Consultants Ltd.
        [email protected]
        www.shorecon.com

        Comment


          #5
          Re: Sum of a child table field in the parent table

          sorry,here is the sample database
          Lee Goldberg
          Software Development and Sales
          Shore Consultants Ltd.
          [email protected]
          www.shorecon.com

          Comment


            #6
            Re: Sum of a child table field in the parent table

            I'm new to v10 - what do I do with all those zip files inside your zip file?
            Robin

            Discernment is not needed in things that differ, but in those things that appear to be the same. - Miles Sanford

            Comment


              #7
              Re: Sum of a child table field in the parent table

              unzip the folder and then open the rhinotest.adb file inside
              Lee Goldberg
              Software Development and Sales
              Shore Consultants Ltd.
              [email protected]
              www.shorecon.com

              Comment


                #8
                Re: Sum of a child table field in the parent table

                Lee,
                It did for me. I tried adding an item with both the invoice form open and closed and it posted correctly each time. Is there more going on than what we see in the sample?

                As for the projects table, you have PO_NUM mapped to WO_NUM which is not the right match for your post field rule to that table. Also the fields do not match in size so PO 123 is 16 characters one place but only 10 in the other. Alpha is going to match blanks too. Same with your Cust ID and some other fields. They should be the same in the other tables if you want your links to work.

                Edit: I take it back. Now I am not sure that the Invoice header was getting the post after all. I tried fixing the fields so they were the same in all the tables and that didn't help. I deleted the old rules, compacted and added them back. And I tried changing the worksheet header so the save would fire but that didn't work either.

                What about making a saved Post operation? I'll try that...
                Last edited by MoGrace; 06-28-2010, 04:55 PM.
                Robin

                Discernment is not needed in things that differ, but in those things that appear to be the same. - Miles Sanford

                Comment


                  #9
                  Re: Sum of a child table field in the parent table

                  You are right I did notice I had the wrong field name for the one posting rule to the project table. Also, the Alltrim() function will take out any blanks so field size won't matter (i don't think it matters anyways)

                  Anyways, it seems that you are noticing my problem with the field rule not posting to grandparent(or higher) tables.

                  I am just going to write a custom script that passes the values to the tables. We'll see...

                  Maybe you could run a script that would execute a "do posting" event after the values have been posted. I however, am not aware of a function that does that...I think it has to be triggered from the change_end() function and for some reason when a child table posts to a parent table it does not consider it a "changed" field value and therefore the posting event on that parent table is not triggered. hmm...
                  Lee Goldberg
                  Software Development and Sales
                  Shore Consultants Ltd.
                  [email protected]
                  www.shorecon.com

                  Comment


                    #10
                    Re: Sum of a child table field in the parent table

                    It does seem like the post field rule is only reliable when posting from the child to the header. I know I gave up on using them for anything else a long time ago. I thought perhaps v10 had expanded this.

                    Hope you get it worked out - there are a lot of great new functions to try...
                    Robin

                    Discernment is not needed in things that differ, but in those things that appear to be the same. - Miles Sanford

                    Comment

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