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Why won't this Xbasic script work?

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    Why won't this Xbasic script work?

    Hi all, can someone tell why this xbasic script is not working? It seems to go through the motions with no errors but no fields are updated.

    I'm obviously missing something but have exhausted all variations that I can come up with.


    tbl1 = table.open("racefields.dbf")
    tbl2 = table.open("percentage.dbf")
    tbl2.index_primary_put("date")

    tbl1.fetch_last()
    while .not. tbl1.fetch_eof()

    rec = tbl2.fetch_find(percentage->date)

    if rec > 0 then

    tbl2.change_begin()

    if tbl1.date=tbl2.date.and.tbl1.time2=tbl2.time then

    if tbl1.overplc=1 then

    tbl2.rated1=tbl1.horse
    tbl2.ratrat1=tbl1.ratings
    tbl2.rat1winpc=tbl1.winpc
    tbl2.dist=tbl1.dist

    end if

    tbl2.change_end(.t.)
    else

    ui_msg_box("Error",racefields->date + " is not in your percentage table")

    end if

    tbl1.fetch_prev()

    end while

    tbl1.close()
    tbl2.close()

    ui_msg_box("Operation Completed","All done.")

    end

    Any help would be very much appreciated,
    Regards
    Greg

    #2
    RE: Why won't this Xbasic script work?

    I don�t exactly understand what you are trying to do, but if - percentage->date - is a date field then - if rec > 0 - wont work, you cant use a numerical expression on a date field

    Daniel Weiss
    Daniel Weiss
    EZ Link Software

    Comment


      #3
      RE: Why won't this Xbasic script work?

      It's inadvisable to name fields or indices after built in functions.

      The 'date' field in the percentage table has the same name as the date() function. Is virtually guaranteed to cause trouble when Alpha Five tries to parse the expression.

      Solution is to familiarize yourself with the function names and don't use any of them to identify objects in your system. Date and Time are often used and almost always cause trouble as field names.

      -- tom

      Comment


        #4
        RE: Why won't this Xbasic script work?

        Looks like, in this part---

        tbl2.change_begin()

        if tbl1.date=tbl2.date.and.tbl1.time2=tbl2.time then

        if tbl1.overplc=1 then

        tbl2.rated1=tbl1.horse
        tbl2.ratrat1=tbl1.ratings
        tbl2.rat1winpc=tbl1.winpc
        tbl2.dist=tbl1.dist

        end if

        tbl2.change_end(.t.)

        you may be having trouble with the begin change and change end.

        Seems it would be more logical as:



        if tbl1.date=tbl2.date.and.tbl1.time2=tbl2.time then

        if tbl1.overplc=1 then
        tbl2.change_begin()
        tbl2.rated1=tbl1.horse
        tbl2.ratrat1=tbl1.ratings
        tbl2.rat1winpc=tbl1.winpc
        tbl2.dist=tbl1.dist
        tbl2.change_end(.t.)
        end if
        There can be only one.

        Comment


          #5
          RE: Why won't this Xbasic script work?

          hi,

          There is a file racefields that stores each horse in a particular race as a record. When the race is run each horse is flagged as having finished 1st, 2rd, 3rd or 4th.

          The percentage table store the results. Each record has fields to accomodate the first 4 placegetters in each race along with their win dividend, rating, etc.

          What I'm trying to do is create a record in percentage that has the 4 placegetters (these are flagged manually in the racefields file after each race)along with their dividends, etc.

          I have created a post operation that creates the records in the percentage file based on the date and time of the race and I'm trying to add the 4 placegetters to those records.

          Regards
          Greg

          Comment


            #6
            RE: Why won't this Xbasic script work?

            I think that the line:

            while .not. tbl1.fetch_eof()

            should be:

            while .not. tbl1.fetch_bof()

            you are stepping backwards through the table and starting with the last record so the while statement stops before it starts

            Comment


              #7
              RE: Why won't this Xbasic script work?

              I'm not sure what your intentions are, but it seems to me that you are only changing one record in table 2. If you want to evaluate each record in the table then you would need to use a function to count the records and then use the loop function ending after all of the records are evaluated. Also you may wish to substitute a variable for the "percentage->date" field used in the fetch_find function.

              Comment

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