Converting early binding to late binding (VBA ADODB)

I think this should do it:

Function SQL_DoThisThing(rng As Range, DateVal As Date, PeriodVal As Integer, AM As String) As Boolean
    ' constants required from ADODB library
    Const adCmdStoredProc As Long = 4
    Const adParamInput   As Long = 1

    Dim cmd              As Object
    Dim conn             As Object
    Dim prm              As Object
    Dim strConn          As String
    Dim strSQL           As String
    Dim ProcName         As String

    Set RecSet = CreateObject("ADODB.Recordset")
    SQL_DoThisThing = False
    ProcName = "someStoredProcedureName"

    On Error GoTo errhandler

    strConn = "Provider=SQLOLEDB.1;" & "Data Source=" & sqlAdr & "; Initial Catalog=" & sqlDb & ";Trusted_connection=yes;"
    Set conn = CreateObject("ADODB.Connection")
    conn.Open strConn

    Set cmd = CreateObject("ADODB.Command")
    cmd.CommandTimeout = 0
    cmd.CommandText = ProcName
    cmd.CommandType = adCmdStoredProc
    cmd.ActiveConnection = conn

    Set prm = cmd.CreateParameter("Date", adDate, adParamInput, 20)
    cmd.Parameters.Append prm
    cmd.Parameters("Date").Value = DateVal

    Set prm = cmd.CreateParameter("Period", adVarChar, adParamInput, 20)
    cmd.Parameters.Append prm
    cmd.Parameters("Period").Value = PeriodVal

    Set prm = cmd.CreateParameter("AM", adVarChar, adParamInput, 20)
    cmd.Parameters.Append prm
    cmd.Parameters("AM").Value = AM

    'Execute the Stored Procedure
    cmd.ActiveConnection = strConn
    Set spobj = cmd.Execute()


    rng.CopyFromRecordset spobj
    SQL_DoThisThing = True

    conn.Close

errhandler:


End Function

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instead of New ADODB.xxx, use CreateObject("ADODB.xxx"), at all Dim var AS xxx, remove (or comment out) the "AS xxx" part.

Note the combination:

Dim cmd as New ADODB.Command

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becomes:

Dim cmd 'as New ADODB.Command
Set cmd = CreateObject("ADODB.Command")

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and delete the reference from your project.

Thanks a lot guys! It did help a lot and It makes perfect sense. However the code debugs on "cmd.Parameters.Append prm".

Function SQL_DoThisThing(rng As Range, resDate As Date, numDays As Integer, AM As String) As Boolean

        Dim cmd As Variant
        Dim conn As Variant
        Dim prm As Variant
        
        Set RecSet = CreateObject("ADODB.Recordset")
        Set conn = CreateObject("ADODB.Connection")
        Set cmd = CreateObject("ADODB.Command")
        
        Dim strConn As String
        Dim strSQL As String
        Dim ProcName As String
        
        Const adCmdStoredProc As Long = 4
        Const adParamInput   As Long = 1
    
        SQL_DoThisThing= False
        ProcName = "someStoredProcedureName"
        
        On Error GoTo errhandler
        
        strConn = "Provider=SQLOLEDB.1;" & "Data Source=" & sqlAdr & "; Initial Catalog=" & sqlDb & ";Trusted_connection=yes;"
        conn.Open strConn

        cmd.CommandTimeout = 0
        cmd.CommandText = ProcName
        cmd.CommandType = adCmdStoredProc
        cmd.ActiveConnection = conn
                

        Set prm = cmd.CreateParameter("DateStart", adDate, adParamInput, 20)
        cmd.Parameters.Append prm  '<<<<------ debugs
        cmd.Parameters("DateStart").Value = resDate
        
        Set prm = cmd.CreateParameter("NumberOfdays", adVarChar, adParamInput, 20)
        cmd.Parameters.Append prm
        cmd.Parameters("NumberOfdays").Value = numDays

        Set prm = cmd.CreateParameter("AggregationMethod", adVarChar, adParamInput, 20)
        cmd.Parameters.Append prm
        cmd.Parameters("AggregationMethod").Value = AM
        
        cmd.ActiveConnection = strConn
        Set spobj = cmd.Execute()
        
        
        rng.CopyFromRecordset spobj
        SQL_DoThisThing = True


        conn.Close
errhandler:
        
        
    End Function

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Any suggestions?

Try declaring your variables as Object, not Variant. If that doesn't work, please tell us what the error is.

Did not work with Object, it returns runtime error 3708 (parameter object is improperly defined. inconsistent or incomplete information was supplied)

Thanks a lot! Great help :)