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counting number of date occurences

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  • counting number of date occurences

    I am creating a database to assign permits for launches on two different rivers. I need a way to show (preferably on a form view) how many launches have been assigned already for a particular date, as we have a limit on the number of launches allowed on any particular date. Ideally, I would like a field displayed on the form view that would give me a running count of how many launches have been assigned to date for a specific launch date. Extra ideally, I would like a means of preventing additional launches being assigned to a date that is already “full”, in that the launch limit for that date has been reached. Any help would be greatly appreciated.

  • #2
    Re: counting number of date occurences

    Possibly the reason you haven't gotten any help yet is that there are quite a few ways to do what you want, and I suspect you will end up wanting much more than what you stated. But perhaps the simplest way given no more than what you stated would be to have a separate 2 field table for each river and a separate form for each table (river). The fields would be like LaunchdDate and Total (total # of launches for each date). In field rules make LaunchDate be unique so for each river there is only one record for any given date. Then create a form something like the attached image. Note that the total field on the form is read only--it can be incremented only via the Add a Launch button. For a new date you simply add a new record. For the Add a Launch button, my test code is:
    Code:
    topparent.Commit()
    topparent.Resynch()
    topparent.Refresh_Layout()
    
    DIM form_name as c
    if is_object(topparent.this) then 
        form_name = topparent.name()+".this"
    else
        form_name = ""
    end if 
    
    dim expression_result as n
    expression_result =  eval("Total+1",form_name)
    If expression_result = 21
        msgbox("Quota Full","Sorry, the launch quota for this date is full.")
        end 
    else
        parentform:Total.value = expression_result
        topparent.Commit()
        topparent.Resynch()
        topparent.Refresh_Layout()
    end if
    The Refresh Data button is just so that user1 can be sure user2 hasn't already added a launch if user1 has been dilly dallying since first opening the view of the record. (The same is done before trying to add a new launch in the code above.)

    This is all pretty simple, just 2 simple tables and 2 simple forms. If you end up wanting much more, such as recording the name of the party assigned to each launch, these tables and forms would not suffice and things could get a bit more complex.

    By the way, it would probably not be a good idea to use "Total" as a field name as I did in my testing--use something like L_Total.

    Good luck.

    Raymond Lyons

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