Using ADODB to write to Excel file - excel

Question

I hope someone can give me some direction using the ADODB methods to accomplish my goal.
Brief explanation:
Currently I have code in Outlook VBA that searches an email. If the email passes criteria the Outlook macro opens an Excel workbook, loops through column A to see if an ID number exists. If it does it updates other columns (1 or more columns), if not it creates a new row and writes data into Columns A-C for that row. Then saves and closes the workbook.
I want to speed up the process and the limiting factor is opening the excel workbook (located on a share drive). I have used a simple ADODB macro to read data in another workbook and have seen the speed increases possible. I want to implement that here.
I have been able to establish connection to the workbook from Outlook and place data into a recordset. BUT I don't know how to "loop" through the first column to see if the ID exists yet or not, and further more how to write data into the columns in the workbook (UPDATE SQL command?).
ExcelConnection Code:
Public Sub ExcelConnect(msg As Outlook.MailItem, LType As String)
Dim lngrow As Long
Dim SourceFile As Variant 'used
Dim SourceSheet As String 'used
Dim SourceRange As String 'used
SourceFile = "T:\Capstone Proj\TimeStampsOnlyTest.xlsx"
SourceSheet = "Timestamps"
SourceRange = "A2:F500"
Dim rsCon As Object 'used
Dim rsData As Object 'used
Dim szConnect As String ' used
Dim szSQL As String ' used
Dim lCount As Long
If Val(Application.Version) < 12 Then
szConnect = "Provider=Microsoft.Jet.OLEDB.4.0;" & _
"Data Source=" & SourceFile & ";" & _
"Extended Properties=""Excel 8.0;HDR=Yes"";"
Else
szConnect = "Provider=Microsoft.ACE.OLEDB.12.0;" & _
"Data Source=" & SourceFile & ";" & _
"Extended Properties=""Excel 12.0;HDR=Yes"";"
End If
szSQL = "SELECT * FROM [" & SourceSheet$ & "$" & SourceRange$ & "];"
Set rsCon = CreateObject("ADODB.Connection")
Set rsData = CreateObject("ADODB.Recordset")
rsCon.Open szConnect
rsData.Open szSQL, rsCon, 0, 1, 1
'***Need Help implementing a way to find exisiting ID numbers, or if Exisiting = 0 then INSERT new row into worksheet***'
Select Case LType '// Choose which columns based on Type
Case "MDIQE"
' If columnvalue = 0 Then
' Update column value
Case "MDIQ"
' If columnvalue = 0 Then
' Update column value
'
'........
'
Case "MDIF"
' If columnvalue = 0 Then
' Update column value
'
End Select
'Error handing & success messagebox
End sub
Thank you for the help,
Wagner

Answer 1

In your SELECT statement, include a WHERE clause to search for the ID in column A, something like this:
SELECT COUNT(*) c
FROM [sourceSheet$sourceRange]
WHERE <ColumnAName> = <ID>
note, this is pseudocode, you'll have to properly assemble the statement just like you did when you assigned a string to szSQL
Then check your result set for the value of c, something like this:
If rsData.Fields("c").value = 0 Then
'ID was NOT found, execute SQL INSERT here
Else
'ID was found, execute SQL UPDATE here
End If
i.e., treat your Excel worksheet like a database.
Of course, it would be better if you could use Access as a database (or SQL Server, or Oracle, or ...) since, well, that's what they're designed to do. But I understand that sometimes you've just got to roll with what you've got.