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Loop construct

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    Loop construct

    Back to my Orienteering database.

    The area where I do this is about 150 square kilometers. I've divided it up into 20 zones, labeled A, B, C ... A control is a member of a zone.

    When I go out to check controls in the fall, I want to print up lists of controls in each zone in a format I can load them into my GPS.

    In access I had to make a form that asked for a letter that ran a macro that ran a querry that would produce a file called exports.txt. And I had to do this separately for each zone.

    My background is in perl. In perl or in any procedural language I would do something like this:

    foreach $zone ('A' .. 'Z') {
    Do a subroutine with $zone that creates $Zone.txt
    }

    Loop constructs are impossible in access. Does Alpha5 have the ability to run a querry on table A with filter parameters either specified in line, or in table B.


    E.g. another example: The clues have 8 boolean fields depending on which races in the season I'm planning to use them. (This way I can set up multiple races in advance.) These fields are labeled R1 to R8

    Now what I would like is
    Table A: My clue table.
    Table B: 8 rows each with a name, and 8 trinary fields that can be true, false, or don't care.
    Query "Make Race tables" runs through Clues 8 times. Each time using one row of table B as it's criteria, and creating a new table called Name

    So if B had a row
    Race_1 T _ _ _ _ _ _ _
    Then after the queery ran there would be a new table Race_1 that had all the clues that had R1 set to True. (A clue can be used on more than one race.)

    Is this do-able?

    #2
    You can certainly do this in A5. I think you've asked a lot of anyone to do all of this for you from the message board, though in the end most of it isn't hard. Have you spent some time with the A5 help? If you have experience with other languages then finding the syntax should be about what you need.

    An orienteering course.... I was the Michigan state champ in Boy Scouts way back when...
    -Steve
    sigpic

    Comment


      #3
      Sherwood,

      "trinary fields" ? These are foreign to Alpha Five. The older Foxpro 2.6 format used to store data in Alpha Five's DBF tables supports logical data types that are True or False. An empty logical field is False, and it's not possible to disinguish between an empty logical field and a False field. The DBF format is fixed width doesn't support nulls as they are understood in other languages.

      Having said that there are lots of tools in Alpha Five that can be used to automate repeating sequences.

      -- tom

      Comment


        #4
        Originally posted by Steve Workings
        You can certainly do this in A5. I think you've asked a lot of anyone to do all of this for you from the message board, though in the end most of it isn't hard. Have you spent some time with the A5 help? If you have experience with other languages then finding the syntax should be about what you need.

        An orienteering course.... I was the Michigan state champ in Boy Scouts way back when...
        Sorry, maybe I came on the wrong way. I'm not looking for exact methods, or asking anyone to write code for me. Most of what I'm looking for is, "Try the index under "foo", or "check out the action "bar", or at most a "here's how I did something sort of like that. "

        Thanks for the tip.

        Comment


          #5
          Sherwood, it seems to me that you might benefit from studying the batch processing capabilities of Alpha Five. These are called "operations" in Alpha Five. I would imagine a filtered export operation could produce the text file you need for a single zone. Once you have it working for a single zone you could modify the underlying script to use a variable in the filter expression (instead of an explicit zone identifier). Then you could write a simple script that steps through all the zones and 'runs' the saved export operation for each zone.

          -- tom

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