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Add Fields to existing table

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  • Add Fields to existing table

    Can any kind person provide a piece of code that will add fields to an existing table with a for next loop. I have used this code to create a table but I cannot 'crack' the code to add to an existing table.

    table.create_begin("F1","c",16) 'Create table "telephonebook"
    table.field_add("S1","c",16) 'First time around
    table.field_add("T1","c",16)

    for x = 2 to 150
    table.field_add("F" + ltrim(str(x)),"c",16) 'Create field for Forename
    table.field_add("S" + ltrim(str(x)),"c",16) 'Create field for Surname
    table.field_add("T" + ltrim(str(x)),"c",16) 'Create field for Telephone Number
    next x

    table.create_end("c:\seniors Alpha 5\telephonebook")
    Regards
    Ron


    The reward for work well done is more work!

  • #2
    Re: Add Fields to existing table

    The easiest I know is table.add_fields() as in.

    Code:
    fields = <<%str%
    Product,c,20
    Price,n,10,2
    Notes,m
    %str%
    table.add_fields("table1", fields)
    There can be only one.

    Comment


    • #3
      Re: Add Fields to existing table

      Stan

      Thank you for that, but I have many fields to add, all of the same structure, and doing that way would be just as long as editing the table structure. Is there another function that can be used. Incidentally, did you know you have a famous name. Stanley Mathews was a famous English Football (Soccer) player!

      Regards

      Ron
      Regards
      Ron


      The reward for work well done is more work!

      Comment


      • #4
        Re: Add Fields to existing table

        Try this to build the list to feed to table.add_fields(). I used 15 so the display would be visible on screen.

        Code:
        flds = ""
        for x = 2 to 15 
        flds = flds+"F" + ltrim(str(x))+",c,16"+crlf()
        flds = flds+"S" + ltrim(str(x))+",c,16"+crlf()
        flds = flds+"T" + ltrim(str(x))+",c,16"+crlf()
        next x
        ui_msg_box("",flds)
        Note that the above yields the equivalent structure of

        Code:
        fields = <<%str%
        Product,c,20
        Price,n,10,2
        Notes,m
        %str%
        ui_msg_box("",fields)
        Last edited by Stan Mathews; 08-09-2011, 11:57 AM.
        There can be only one.

        Comment


        • #5
          Re: Add Fields to existing table

          Stan
          Thank you.
          I have not tested this one, but how long can a string be? No pun intended.
          Regards
          Ron
          Regards
          Ron


          The reward for work well done is more work!

          Comment


          • #6
            Re: Add Fields to existing table

            I don't think there's a practical limit in this usage.

            Code:
            flds = ""
            for x = 2 to 200 
            flds = flds+"F" + ltrim(str(x))+",c,16"+crlf()
            flds = flds+"S" + ltrim(str(x))+",c,16"+crlf()
            flds = flds+"T" + ltrim(str(x))+",c,16"+crlf()
            next x
            n = len(flds)
            ? n
            = 6249.000000
            There is a limit of 1023 fields per table. (Specifications)
            There can be only one.

            Comment


            • #7
              Re: Add Fields to existing table

              Stan

              Thank you. This is a very tidy way.

              Regards
              Ron
              Regards
              Ron


              The reward for work well done is more work!

              Comment


              • #8
                Re: Add Fields to existing table

                Ron

                When I see a data structure like this it always raises the question of why.

                So if we know more about what you are trying to do, perhaps we can suggest a solution.

                Looking at your previous posts leads me to believe there may be another solution.
                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

                Comment


                • #9
                  Re: Add Fields to existing table

                  Ron, I presume you know about creating Tables using Text?
                  Somewhere in the distant past I created a Data Dictionery app with specific Rules for the naming, format and size of the Fields which in turn created a CSV which could then be used to create a Table.
                  Prevented Duplicate Name Errors, Formatting Errors etc. as they were covered by the (somewhat simple) Field Rules.
                  It on a BT Server somewhere now.
                  Ted Giles
                  Example Consulting - UK
                  .

                  sigpichttp://ec12.example-software.com//
                  See our site for Alpha Support, Conversion and Upgrade.

                  Comment

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