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Web View one to many (cartesian product)

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  • Web View one to many (cartesian product)

    I want to use a grid in the web which is based on a VIEW. This view is based on a one to may relationship. (Basically a cartesian product)

    1 Header can have several sub lines.. But I want to display them as lines in ONE grid. Not 2 grids linked toegether. This can be done if I could connect to a SQL database . Just define the view there and use the view in the grid. But not using DBF files.

    In Alpha you have SETS: but you cannot use this in the web environment.
    You also have MAPPED TABLES, but unfortunately these only support ONE to ONE relationships.

    So I do not see a possiblity to solve the issue using Alpha with DBF tables.
    But I am hoping somebody sees a solution..

    See also thread:
    http://msgboard.alphasoftware.com/al...d.php?p=471390

    regards, Ron

  • #2
    Re: Web View one to many (cartesian product)

    Ron,

    If you have a view of say customer as the parent and charges as the child, and custname, custid and custphone are in the parent, and then say prodname, amount, and units are in the child, you can set up a grid with the 1st 3 columns of each line coming from the parent, and the next 3 columns coming from the child. So, the column headings would be custname, custid, custphone, prodname, amount, and units, and each line would be a record from the child, witjh the 1st 3 columns getting its data from the parent.

    Is this what you mean?

    Gary
    Gary S. Traub, Ph.D.

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    • #3
      Re: Web View one to many (cartesian product)

      In the A5 web for a one - to - many linkage you can use the grid linker.

      But I'm not sure that will provide the answer for you.

      Take one step back and explain what you are doing with the cartesian product. There may be another way to solve the problem.
      Al Buchholz
      Bookwood Systems, LTD
      Weekly QReportBuilder Webinars Thursday 1 pm CST

      Occam's Razor - KISS
      Normalize till it hurts - De-normalize till it works.
      Advice offered and questions asked in the spirit of learning how to fish is better than someone giving you a fish.
      When we triage a problem it is much easier to read sample systems than to read a mind.
      "Make it as simple as possible, but not simpler."
      Albert Einstein

      http://www.iadn.com/images/media/iadn_member.png

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      • #4
        Re: Web View one to many (cartesian product)

        Al, thanks you, but I would like to display it in ONE grid as opposed to the gridlinker which displays two grids linked together.

        Gary, Yes that is what I mean. Now I hope you have a solution for that.

        You say: "you can set up a grid with the 1st 3 columns of each line coming from the parent, and the next 3 columns coming from the child. So, the column headings would be custname, custid, custphone, prodname, amount, and units, and each line would be a record from the child, witjh the 1st 3 columns getting its data from the parent."

        But how would you do that; Step by step, please?


        regards, Ron
        Last edited by rleunis; 09-25-2008, 08:38 AM.

        Comment


        • #5
          Re: Web View one to many (cartesian product)

          Hi Ron,

          Actually, I do that a lot. I should habve pointed out that you should flip the tables, i.e, in your view, make charges the parent and customer the child. Then the grid will show all the records of the charges table, and the parent fields will be available for display on each line.

          Gary
          Gary S. Traub, Ph.D.

          Comment


          • #6
            Re: Web View one to many (cartesian product)

            and the parent fields will be available for display on each line.


            This should say "and the CUSTOMER fileds ..."
            Gary S. Traub, Ph.D.

            Comment


            • #7
              Re: Web View one to many (cartesian product)

              Gary,

              But But how would you do that; Step by step, please?
              Would you define a Mapped Table?

              You can only adress ONE table in a grid. Please let me know, step by step. regards, Ron

              Comment


              • #8
                Re: Web View one to many (cartesian product)

                But But how would you do that; Step by step, please?
                Would you define a Mapped Table?

                You can only adress ONE table in a grid. Please let me know, step by step. regards, Ron


                Ron,

                No mapped table would be needed.

                You can address more than one table in a Grid - You started the thread stating that you want to use a View. A View allows you to specify relationships between tables, much like a set. It defines a one to one relationship, true. But the key in what I described above is to flip the tables. Think of this way: If you did not use a view, and based the grid on just the charges table, your grid would show all the charges. Or you could even filter the grid (with an argument based on a session variable perhaps) and just show all the charges for a particular customer or for a particular date or whatever you want. Now the only thing missing from this would be that you want the first few columns to contain data that is not in the charges table, it is in the customer table. You could create calculated fields based on lookup() and pull in the data that way. Or you could use a view, set up with charges as the parent and customer as the child. If you use the view:

                1. Go to the query tab, and select the View option in the radio button.

                2. Define the tables to include in the view, i.e. first add the charges table, and then add the customer table.

                3. In the Link properties of the customer (child) table, leave the defaults but the last 2 fields, regarding the link expression should be the common field from each table that you are linking them by - probably something like custid.

                4. Now click on the Fields in View button, and on the left you will see a drop down that displays the charges table with its fields. Select the fields you want from the charges table. After that, clik on the drop down, and select the customer table. Now the fields from the customer table will show. Select the fields from the customer table. Now you have defined the fields that you will display on the grid, drawn from TWO TABLES.

                5. Now go to the Fields tab, and the fields that you just defined in the Fields in View section (step 4) will show as Available fields. Select all of these.

                Save the grid, and voila!

                Gary
                Gary S. Traub, Ph.D.

                Comment


                • #9
                  Re: Web View one to many (cartesian product)

                  Voila !

                  Yes that worked ! Thank you very much for giving this solution which actually goes against my feeling of defining a ONE to MANY relationship...

                  But heck it works. I do now get all the fields duplicated when there are more than one child. Just have to see what it does if there are no childs, but there is a parent..Probably no entry in this case.

                  Thanks again Gary. I owe you one. regards, Ron

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