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SQL to Code: How to write it.

Posted on 2006-06-12
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Last Modified: 2012-05-05
I have a form in which are input two dates which I would like to display in a text box by using the AfterUpdate Event of the second date field. The SQL for the query that subtracts the two dates is:

SELECT CInt(([EndDateTime]-[StartDateTime])*1440) Mod 60 AS Minutes, CInt(([EndDateTime]-[StartDateTime])*24) Mod 24 AS Hours, Format([Hours],"0") &  " hours, " & Format([Minutes],"0") & " minutes" AS Elapsed
FROM tblTrades;

How would I write that in code format?

Thanks.
RWW
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Question by:PstWood
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Expert Comment

by:harfang
ID: 16890682
Hello PstWood

A translation to VB could look like this:


Private Sub txtEndDateTime_Click()

    Dim lngMinutes As Long
    Dim lngHours As Long

    lngMinutes = CInt((txtEndDateTime - txtStartDateTime) * 1440) Mod 60
    lngHours = CInt((txtEndDateTime - StartDateTime) * 24) Mod 24
    txtElapsed = Format(lngHours, "0") & " hours, " & Format(lngMinutes, "0") & " minutes"

End Sub


You can also use the exact same syntax you had in the query for textboxes on your form. For example, start with a textbox txtMinutes, and use:

    = CInt(([EndDateTime]-[StartDateTime])*1440) Mod 60

And continue with txtHours and txtElapsed. Then hide those you don't want (or, of course, incorporate the definitions of Minutes and Hours into the last expression, making one very long but valid expression...


(°v°)
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Accepted Solution

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harfang earned 125 total points
ID: 16890701
I just noticed the Mod 24. If you do want a wrap at 24 hours, you can use simply this:

    = Format(EndDateTime-StartDateTime, 'h" hours, "n" minutes"')

Or, in VB:

    txtElapsed = Format(EndDateTime - StartDateTime, "h"" hours, ""n"" minutes""")

I was under the impression you needed the function to *allow* results over 24 hours. Incidentally, I think I would do it like this, though:

Private Sub txtEndDateTime_Click()

    Dim lngMinutes As Long

    lngMinutes = CLng((txtEndDateTime - txtStartDateTime) * 1440)
    txtElapsed = (lngMinutes \ 60) & " hours, " & (lngMinutes Mod 60) & " minutes"

End Sub

Anyway, good luck!
(°v°)
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Author Comment

by:PstWood
ID: 16894433
Yep. That worked. I made the following changes to include Me. for the text boxes being used.

Private Sub EndDateTime_AfterUpdate()

    Dim lngMinutes As Long

    lngMinutes = CLng((Me.EndDateTime - Me.StartDateTime) * 1440)
    Me.Duration = (lngMinutes \ 60) & " hours, " & (lngMinutes Mod 60) & " minutes"

End Sub

Thanks again.
RWW
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LVL 58

Expert Comment

by:harfang
ID: 16894510
Glad it worked, and success with your application!
(°v°)
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