associative array in vba like php

Question

I need your help for building analytics in Microsoft Excel using VBA.

I have one data sheet with y columns and n lines

Line Number  Firstname  Lastname  Country  Training Hours  Training Status
1            John       Smith     USA      1               Completed
2            Henri      Dupont    France   1               Completed
3            Paul       Walker    USA      25              Incomplete
4            Ron        Howard    USA      10              Completed

And I would like to use array like in php but using VBA

For i = 1 To nblines
    If(array[i]["Country"] = "USA" And array[i]["Training Status"] = "Completed") Then
        myval = myval + array[i]["Training Hours"]
    End If
Next

myval should be 11

Unfortunately I don't find THE solution. I've tried dictionnary, collection and array but without success. Any idea?

Answer 1

You can make the SQL query to the worksheet in the opened workbook (the same way as to any other workbook). In this case the query string will be as follows:

SELECT SUM([Training Hours]) AS Myval FROM [data sheet$] WHERE Country = 'USA' AND [Training Status] = 'Completed';

Here is the code

Sub TestSQLRequest()

    Const adOpenStatic = 3
    Const adLockOptimistic = 3
    Const adCmdText = &H1

    Select Case LCase(Mid(ThisWorkbook.Name, InStrRev(ThisWorkbook.Name, ".")))
        Case ".xls"
            strConnection = "Provider=Microsoft.Jet.OLEDB.4.0;User ID=Admin;Data Source='" & ThisWorkbook.FullName & "';Mode=Read;Extended Properties=""Excel 8.0;HDR=YES;"";"
        Case ".xlsm"
            strConnection = "Provider=Microsoft.ACE.OLEDB.12.0;User ID=Admin;Data Source='" & ThisWorkbook.FullName & "';Mode=Read;Extended Properties=""Excel 12.0 Macro;HDR=YES;"";"
    End Select

    With CreateObject("ADODB.Connection")
        .Open strConnection
        With .Execute("SELECT SUM([Training Hours]) AS Myval FROM [data sheet$] WHERE Country = 'USA' AND [Training Status] = 'Completed';")
            Myval = .Fields("Myval")
        End With
        .Close
    End With

    MsgBox Myval

End Sub

Within the query string, the column names with spaces should be put into square brackets, as well as the name of the worksheet containing data followed by $. It goes without saying that the query can't access to the data, which wasn't saved to the file after some changes have been made to the sheet. Note that Excel 8.0 provider won't work on 64-bit Excel version, try to use Excel 12.0 provider instead (the second strConnection assignment).

Answer 2

So I set my sheet up like this:

Then using the following code I loaded the array and cycled through each line in the array. I added the Hours as they met the condition and displayed the result in the immediate window.

Edit: As far as I know excel does not use column names. So the only way I could come up with is this, Where we add the first row into the array then cycle through them looking for the names in the first row of the array to get the position of that column then use the variable to find again.

A quicker method would likely be an advanced filter with subtotals. Filter on a different page than the data. Or, the best answer would be using a pivot table.

Sub nubuk()

Dim arr() As Variant
Dim smTtl As Double
Dim i&
Dim lastrow As Long
Dim lastcolumn
Dim t&
Dim cntry&, stus&, hrs&

With ActiveSheet
    lastrow = .Cells(.Rows.Count, 1).End(xlUp).Row
    lastcolumn = Cells(1, .Columns.Count).End(xlToLeft).Column
    Debug.Print lastcolumn
    arr = .Range(.Cells(1, 1), .Cells(lastrow, lastcolumn)).Value
End With
For t = 1 To lastcolumn
    Select Case LCase(arr(1, t))
        Case "country"
            cntry = t
        Case "training status"
            stus = t
        Case "training hours"
            hrs = t
        Case Else
    End Select
Next t
For i = LBound(arr, 1) To UBound(arr, 1)
    If arr(i, cntry) = "USA" And arr(i, stus) = "Completed" Then
        smTtl = smTtl + arr(i, hrs)
    End If
Next

Debug.Print smTtl

End Sub