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Solved problem with function A5_ADD_FIELDS_TO_TABLE

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  • Solved problem with function A5_ADD_FIELDS_TO_TABLE

    Thought I'd share the solution to a problem I hit with function A5_ADD_FIELDS_TO_TABLE on the desktop.

    Rather than having to export records, modify structure, import records on a table when I add fields to a table, I have been using the AUTOEXEC script to add any missing fields to a table. This has been working well for several years until I hit an error trying to update the structure of a table on a network optimised workstation.

    It seems obvious now, but you can't update the structure directly on a network optimised copy of the database as the fields don't actually exist!

    Resolution was to recode the AUTOEXEC to use this syntax:

    a5_add_fields_to_table(a5.Get_Master_Path()+"\<tablename>.dbf","<fieldname>,<type>,<length>")

    instead of the standard:

    a5_add_fields_to_table("<tablename>,"<fieldname>,<type>,<length>")

    This works for both standard and network optimised databases (I assume the "\" before the tablename is discarded by Alpha) removing the need to test/code different solutions for local & networked implementations.

    Hope this helps somebody some day.

  • #2
    Re: Solved problem with function A5_ADD_FIELDS_TO_TABLE

    Hi Jon,
    Why would the '\ be discarded when it is a necessary part of the path statement? When working with local or server tables it is a good idea to test first if a5.get_master_path() returns blank or not, then construct the path accordingly.
    Robin

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

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    • #3
      Re: Solved problem with function A5_ADD_FIELDS_TO_TABLE

      Robin, I get the impression that the '\' is ignored if at the beginning of the tablename e.g. a5.get_master_path() = "". This doesn't work in DOS - file not found, but appears to be valid in Alpha. If it's a bug, I hope Alpha don't fix it!

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      • #4
        Re: Solved problem with function A5_ADD_FIELDS_TO_TABLE

        Any of the path functions return the path without the final \

        ? a5.Get_Path()
        = "H:\Buyers\Public\Grocery Merchandising\WklyChg"

        So to have a valid path you have to add the backslash.
        There can be only one.

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        • #5
          Re: Solved problem with function A5_ADD_FIELDS_TO_TABLE

          Stan, my point was that if running on a standard database and a5.get_master_path() returns an empty string the leading "\" does not cause a problem for the subsequent (in this case) a5_add_fields_to_table call e.g. both a5_add_fields_to_table("<tablename>,"<fieldname>,<type>,<length>") AND a5_add_fields_to_table("\<tablename>,"<fieldname>,<type>,<length>") work.

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          • #6
            Re: Solved problem with function A5_ADD_FIELDS_TO_TABLE

            It only matters if you have to add the path since otherwise A5 is looking in the adb path.
            Robin

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

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            • #7
              Re: Solved problem with function A5_ADD_FIELDS_TO_TABLE

              Originally posted by MoGrace View Post
              It only matters if you have to add the path since otherwise A5 is looking in the adb path.
              Mostly true.

              Except when I rely that it does and it doesn't.

              So I tend to provide the path. Except when I forget.

              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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