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sorting a subset of a dbf file et al

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  • sorting a subset of a dbf file et al

    I know enough to be dangerous and need some help ...

    I have a dbf file with each record containing a name, sort field, then 4 true/false fields.

    I need to process this file, multiple times (one for each parameter) in a sequential manner, defined by the sort field.

    Each time I process the file (once for each true/false field), I need to test the respective true/false field if it is "true" then write out a text asc file.

    The problem I am having is that I cannot get the file in the sorted sequence I need so that I can cycle thru it multiple times .. then the issue is how to process/cycle it multiple times...

    The rest is working ..

    Any help would be appreciated..

  • #2
    Re: sorting a subset of a dbf file et al

    The rest is working ..
    And what might the rest be?

    One generally orders a table by setting an approprite index into control.

    tbl_pointer.index_primary_put("tagname")

    or telling Alpha to order the table.

    tbl_pointer.order("somefieldname")
    There can be only one.

    Comment


    • #3
      Re: sorting a subset of a dbf file et al

      the rest is testing if true is in the field and determining if a record should be written or not.

      Now to cycle thru the database ...

      Stan .. thanks for the suggestions . .now to see if I can make them work ..


      ps .. maybe it is me .. but the help does not seem to be very much help at times ...

      Comment


      • #4
        Re: sorting a subset of a dbf file et al

        Stan, I inserted the following ...

        tbl = table.open("hallwebpagemfg")
        tbl_pointer.order("Mfgname")
        tbl.fetch_first()

        and it bombs out on the "tbl_pointer.order line ...

        This is a "dbf" file .. and I thought I read some place where that sorting a dbf file (not using its index) is not possible ...

        Is there other code that must exit for this to work ??

        Comment


        • #5
          Re: sorting a subset of a dbf file et al

          I used tbl_pointer generically to indicate you had to have one. Yours is tbl so you want

          tbl = table.open("hallwebpagemfg")
          tbl.order("Mfgname")
          tbl.fetch_first()
          There can be only one.

          Comment


          • #6
            Re: sorting a subset of a dbf file et al

            Originally posted by BEAMER View Post

            and it bombs out on the "tbl_pointer.order line ...
            Is there a space between .order and line?

            Fieldname should have an underscore instead of a space. Xbasic code thinks there is another word there instead of a fieldname.
            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

            Comment


            • #7
              Re: sorting a subset of a dbf file et al

              Stan and Al,

              As I said I know enough to be dangerous ....

              For some reason I thought you needed a new pointer object .. then realized that I already had the one I needed.

              I changed it accordingly .. and it worked like a charm ..

              Now to tackle the recycling for each of the T/F fields ..

              Thanks ...

              Comment


              • #8
                Re: sorting a subset of a dbf file et al

                I hope there is someone that can help me with this as I have come to an impasse ....

                I get an "expected value" error message (which to me tells me nothing ....
                .... on the line ....

                FileName = "d:\temp\" + category[IndxNum]


                I am also toying with how to make

                if tbl.activecode = .T. then

                change to

                if tbl.telephony = .T. then ...... on cycle 2

                and

                if tbl.strcable = .T. then ... on cycle 3

                ... etc.. etc.. to the last cycle .. that would be appreciated ...

                Any HELP would be appreciated ..


                Here is the code ..

                '
                dim tbl as P
                dim category[0] as C
                dim IndxNum as N
                dim FileName as C
                '
                msgbox("Starting Process")
                '
                category[] = "Activecode"
                category[] = "Telephony"
                category[] = "Strcable"
                category[] = "Security"
                category[] = "Avproducts"
                category[] = "Outside"
                category[] = "Iptelephony"
                category[] = "Specialneeds"
                category[] = "Ipsecurity"
                category[] = "Ipsupport"
                IndxNum = category.size()
                '
                tbl = table.open("hallwebpagemfg")
                tbl.index_primary_put("Mfgname")
                IndxNum = 1
                while IndxNum < (IndXNum + 1)
                FileName = "d:\temp\" + category[IndxNum]
                FileName = FileName + ".txt"
                file_pointer = file.create(FileName, FILE_RW_EXCLUSIVE)
                tbl.fetch_first()
                while .NOT. tbl.fetch_eof()
                if tbl.activecode= .T. then
                file_pointer.write_line(trim(tbl.mfgname) + " " + trim(tbl.mfghtml))
                end if
                tbl.fetch_next()
                end while
                IndxNum = IndxNum + 1
                file_pointer.flush()
                file_pointer.close()
                end while
                msgbox("Completed Process")

                Comment


                • #9
                  Re: sorting a subset of a dbf file et al

                  Backslash has several meanings in xbasic expressions. Check the documentation for an explanation.

                  You need

                  FileName = "d:\temp\\" + category[IndxNum]

                  or

                  FileName = "d:\temp"+chr(92) + category[IndxNum]
                  There can be only one.

                  Comment


                  • #10
                    Re: sorting a subset of a dbf file et al

                    Stan, thanks for your help .. it solved the file problem .... and as I suspected .. this has lead to another question ..

                    if I have a field name in an array variable called "category[IndxNum"] how do I get the contents of that field that is located in the table "tbl".

                    And the other question is I must be misusing the documentation as when I need to find out all the actions that can be applied to the object "tbl" I have no idea how to find it .. any thoughts ..

                    I really appreciate the help .. Don

                    Comment


                    • #11
                      Re: sorting a subset of a dbf file et al

                      if I have a field name in an array variable called "category[IndxNum"] how do I get the contents of that field that is located in the table "tbl".
                      Example is easiest (from the interactive window).

                      Code:
                      dim arr[2] as C
                      arr[1] = "state"
                      arr[2] = "city"
                      
                      tbl = table.open("store")
                      ? tbl.CITY
                      = "Glasgow             "
                      
                      ? eval("tbl."+arr[2])
                      = "Glasgow             "
                      
                      tbl.close()
                      Though not complete you can find most functions and methods that are available to a table pointer in the documentation under the title (strangely enough) Table Functions and Methods. There are a few missing from that topic which you will see in the xbasic explorer or autocomplete in the code editor .
                      Attached Files
                      There can be only one.

                      Comment

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