VBScript create a multi-dimensional array and add to it?

Question

This is a doozy for me haha, I\'ve pretty much checked nearly every page on Google Search and I still don\'t quiet understand how to do it.

I want to create a multi

Answer 1

This may be off-topic, but after seeing your exact code, why aren't you using the built-in ADO function: GetRows() ?

    sub grabdata
        SQL_query = "SELECT * FROM MSAccess_table"
        Set rsData = conn.Execute(SQL_query)
        If Not rsData.EOF Then aData = rsData.GetRows()         
    end sub

This returns all your column # as the first index, and the rows (data) in the second.

So to loop through it, you would:

If IsArray(aData) Then
    For x = lBound(aData,2) to uBound(aData,2) 'loops through the rows
        Col1 = aData(0,x)
        Col2 = aData(1,x)
        Col3 = aData(2,x)
        Response.Write "Row #" & x+1 & "<br>"
        Response.Write "This is the data in Column1: " & Col1 & "<br>"
        Response.Write "This is the data in Column2: " & Col2 & "<br>"
        Response.Write "This is the data in Column3: " & Col3 & "<br>"
    Next
End If

*NOTE: Rows (and columns) start on 0 in the array by default.

Answer 2

set rs = conn.execute(strQry)

arrRAY = rs.GetRows()

if isarray(arrRAY) then
  do stuff
end if

Answer 3

(1) The best way to get an ADO resultset into a two-dimensional array is to use the .GetRows method. Then your problem just vanishes.

(2) There are two kind of arrays in VBScript. Fixed arrays are declared by specifying their UBounds:

Dim aFix(2, 3)

They can't be resized. Dynamic arrays can be changed by ReDim [Preserve]. The best way to create such an array is

ReDim aDyn(2, 3)

if you know the starting size, or

Dim aDyn : aDyn = Array()

if you want to start with an empty one. The catch 22 is: you can use Preserve only for the last dimension.

(3) Your

Dim data2()

is an abomination - a fixed array of no size. It's a pity that the 'compiler' is too stupid to catch such a beast that VBScript can't handle properly:

>> Dim data2()
>> WScript.Echo UBound(data2)
>>
Error Number:       9
Error Description:  Subscript out of range

The nastiness of the Dim a() statement is hidden by the fact that a later ReDim will store a proper dynamic array into that variable:

>> Dim data2() ' <-- abomination
>> ReDim data2(1,1) ' <-- overwritten by a dynamic array
>> data2(0,0) = 0
>> ReDim Preserve data2(1,5) ' last dimension increased; 'old' data preserved
>> data2(1,5) = 1
>> WScript.Echo data2(0,0), data2(1,5)
>>
0 1

Update wrt jmbpiano's comment:

(1) I gave evidence that you can't get the UBound for a variable dimmed with (), so I stick to my claim that such beasts are abominations. Just look at the question (or this one) to see that using the () will give you trouble.

(2) I said that you should use ReDim a(KnownUbound) to 'declare' a dynamic array with known size, but I didn't give evidence for the 'Option Explicit'-compatibility of this idiom. So :

Option Explicit
ReDim a(4711)
ReDim b(4,7,1,1)
a(0) = "qed"
b(0,0,0,0) = "qed"
WScript.Echo b(0,0,0,0)

output:

cscript 19888987.vbs
qed