Excel函数访问函数

Question

I created UPC check-digit function in excel which is working perfectly fine but i am now in need of creating same thing in MS Access.

here is the code:

Public Function CHECKDIGIT(UPC As String) As String

    If Len(UPC) = 8 Then

        CHECKDIGIT = WorksheetFunction.RoundUp(WorksheetFunction.Sum(Mid(UPC, 1, 1), Mid(UPC, 3, 1), Mid(UPC, 5, 1), Mid(UPC, 7, 1)) * 3 + WorksheetFunction.Sum(Mid(UPC, 2, 1), Mid(UPC, 4, 1), Mid(UPC, 6, 1)), -1) - (WorksheetFunction.Sum(Mid(UPC, 1, 1), Mid(UPC, 3, 1), Mid(UPC, 5, 1), Mid(UPC, 7, 1)) * 3 + WorksheetFunction.Sum(Mid(UPC, 2, 1), Mid(UPC, 4, 1), Mid(UPC, 6, 1)))

    ElseIf Len(UPC) = 12 Then

        CHECKDIGIT = WorksheetFunction.RoundUp(WorksheetFunction.Sum(Mid(UPC, 1, 1), Mid(UPC, 3, 1), Mid(UPC, 5, 1), Mid(UPC, 7, 1), Mid(UPC, 9, 1), Mid(UPC, 11, 1)) * 3 + WorksheetFunction.Sum(Mid(UPC, 2, 1), Mid(UPC, 4, 1), Mid(UPC, 6, 1), Mid(UPC, 8, 1), Mid(UPC, 10, 1)), -1) - (WorksheetFunction.Sum(Mid(UPC, 1, 1), Mid(UPC, 3, 1), Mid(UPC, 5, 1), Mid(UPC, 7, 1), Mid(UPC, 9, 1), Mid(UPC, 11, 1)) * 3 + WorksheetFunction.Sum(Mid(UPC, 2, 1), Mid(UPC, 4, 1), Mid(UPC, 6, 1), Mid(UPC, 8, 1), Mid(UPC, 10, 1)))

    ElseIf Len(UPC) = 13 Then

        CHECKDIGIT = WorksheetFunction.RoundUp(WorksheetFunction.Sum(Mid(UPC, 1, 1), Mid(UPC, 3, 1), Mid(UPC, 5, 1), Mid(UPC, 7, 1), Mid(UPC, 9, 1), Mid(UPC, 11, 1)) + WorksheetFunction.Sum(Mid(UPC, 2, 1), Mid(UPC, 4, 1), Mid(UPC, 6, 1), Mid(UPC, 8, 1), Mid(UPC, 10, 1), Mid(UPC, 12, 1)) * 3, -1) - (WorksheetFunction.Sum(Mid(UPC, 1, 1), Mid(UPC, 3, 1), Mid(UPC, 5, 1), Mid(UPC, 7, 1), Mid(UPC, 9, 1), Mid(UPC, 11, 1)) + WorksheetFunction.Sum(Mid(UPC, 2, 1), Mid(UPC, 4, 1), Mid(UPC, 6, 1), Mid(UPC, 8, 1), Mid(UPC, 10, 1), Mid(UPC, 12, 1)) * 3)

    ElseIf Len(UPC) = 14 Then

        CHECKDIGIT = WorksheetFunction.RoundUp(WorksheetFunction.Sum(Mid(UPC, 1, 1), Mid(UPC, 3, 1), Mid(UPC, 5, 1), Mid(UPC, 7, 1), Mid(UPC, 9, 1), Mid(UPC, 11, 1), Mid(UPC, 13, 1)) * 3 + WorksheetFunction.Sum(Mid(UPC, 2, 1), Mid(UPC, 4, 1), Mid(UPC, 6, 1), Mid(UPC, 8, 1), Mid(UPC, 10, 1), Mid(UPC, 12, 1)), -1) - (WorksheetFunction.Sum(Mid(UPC, 1, 1), Mid(UPC, 3, 1), Mid(UPC, 5, 1), Mid(UPC, 7, 1), Mid(UPC, 9, 1), Mid(UPC, 11, 1), Mid(UPC, 13, 1)) * 3 + WorksheetFunction.Sum(Mid(UPC, 2, 1), Mid(UPC, 4, 1), Mid(UPC, 6, 1), Mid(UPC, 8, 1), Mid(UPC, 10, 1), Mid(UPC, 12, 1)))

    ElseIf Len(UPC) = 17 Then

        CHECKDIGIT = WorksheetFunction.RoundUp(WorksheetFunction.Sum(Mid(UPC, 1, 1), Mid(UPC, 3, 1), Mid(UPC, 5, 1), Mid(UPC, 7, 1), Mid(UPC, 9, 1), Mid(UPC, 11, 1), Mid(UPC, 13, 1), Mid(UPC, 15, 1)) + WorksheetFunction.Sum(Mid(UPC, 2, 1), Mid(UPC, 4, 1), Mid(UPC, 6, 1), Mid(UPC, 8, 1), Mid(UPC, 10, 1), Mid(UPC, 12, 1), Mid(UPC, 14, 1), Mid(UPC, 16, 1)) * 3, -1) - (WorksheetFunction.Sum(Mid(UPC, 1, 1), Mid(UPC, 3, 1), Mid(UPC, 5, 1), Mid(UPC, 7, 1), Mid(UPC, 9, 1), Mid(UPC, 11, 1), Mid(UPC, 13, 1), Mid(UPC, 15, 1)) + WorksheetFunction.Sum(Mid(UPC, 2, 1), Mid(UPC, 4, 1), Mid(UPC, 6, 1), Mid(UPC, 8, 1), Mid(UPC, 10, 1), Mid(UPC, 12, 1), Mid(UPC, 14, 1), Mid(UPC, 16, 1)) * 3)

    ElseIf Len(UPC) = 18 Then

        CHECKDIGIT = WorksheetFunction.RoundUp(WorksheetFunction.Sum(Mid(UPC, 1, 1), Mid(UPC, 3, 1), Mid(UPC, 5, 1), Mid(UPC, 7, 1), Mid(UPC, 9, 1), Mid(UPC, 11, 1), Mid(UPC, 13, 1), Mid(UPC, 15, 1), Mid(UPC, 17, 1)) * 3 + WorksheetFunction.Sum(Mid(UPC, 2, 1), Mid(UPC, 4, 1), Mid(UPC, 6, 1), Mid(UPC, 8, 1), Mid(UPC, 10, 1), Mid(UPC, 12, 1), Mid(UPC, 14, 1), Mid(UPC, 16, 1)), -1) - (WorksheetFunction.Sum(Mid(UPC, 1, 1), Mid(UPC, 3, 1), Mid(UPC, 5, 1), Mid(UPC, 7, 1), Mid(UPC, 9, 1), Mid(UPC, 11, 1), Mid(UPC, 13, 1), Mid(UPC, 15, 1), Mid(UPC, 17, 1)) * 3 + WorksheetFunction.Sum(Mid(UPC, 2, 1), Mid(UPC, 4, 1), Mid(UPC, 6, 1), Mid(UPC, 8, 1), Mid(UPC, 10, 1), Mid(UPC, 12, 1), Mid(UPC, 14, 1), Mid(UPC, 16, 1)))

    ElseIf Len(UPC) <> 8 Or Len(UPC) <> 12 Or Len(UPC) <> 13 Or Len(UPC) <> 14 Or Len(UPC) <> 17 Or Len(UPC) <> 18 Then

        CHECKDIGIT = "MISSING DIGITS"

    End If
End Function

Is there any easy way to convert this to MS Access? To my knowledge not all formulas will transfer directly to access so I image I will need to build custom function in Access too.

Any idea how to go with this?

Thanks, Slav

Answer 1

The following code should work equally well in Excel and Access:

Public Function CHECKDIGIT(UPC As String) As String
    Dim n As Integer
    Dim i As Integer

    Select Case Len(UPC)
        Case 8, 12, 13, 14, 17, 18
            n = 0
            For i = 1 To Len(UPC) - 1
                If ((Len(UPC) - i) Mod 2) = 1 Then
                    n = n + CInt(Mid(UPC, i, 1)) * 3
                Else
                    n = n + CInt(Mid(UPC, i, 1))
                End If
            Next
            CHECKDIGIT = CStr(Int(n / 10 + 0.99) * 10 - n)

        Case Else

            CHECKDIGIT = "MISSING DIGITS"

    End Select
End Function

Answer 2

Thank you for the code YowE3K. I think there is something missing in that code. When i run it against results i get using my code It fails.

UPC CHCKDIGIT   NEW CHKDIGIT
018371009355    5   5
00018371009355  5   5
7501206634004   4   10
00018371019354  4   14
018371019354    4   14

Also by using function i just found out that i cant use the function as part of data entry validation. I will have to use formula using what Comintern suggested above.

Thank you both guys for helping with this.