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Excel VBA SQL statement to get last ID

Posted on 2011-09-10
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Last Modified: 2012-05-12
Hi

In Excel VBA I am trying to get the last ID entered in a SQL table
How do I modify the following code to assign the
results of my SELECT statement to a string variable
called sMyLastID?
Dim oSQL As String
    
    On Error GoTo EH
    
    Set con = New ADODB.Connection
    
    con.Open "Provider=SQLOLEDB;Data Source=196.220.43.237,1441;Network Library=DBMSSOCN;Initial Catalog=test;User ID=murbhhh;Password=chfff;"

    Set cmd = New ADODB.Command
    
    'Check last ID ---------------------------
    Dim oLastID As Variant
    oLastID = "SELECT MAX(ID) FROM Table1"
    With cmd
        .CommandText = oLastID
        .CommandType = adCmdText
        .ActiveConnection = con
        .Execute
    End With
    '------------------------------------------

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Question by:Murray Brown
6 Comments
 
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Expert Comment

by:Friman001
ID: 36516536
I could help easier if this was C#, but from what I see, you should just be able to say oLastId.ToString() and that should be holding the last ID.
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LVL 60

Expert Comment

by:Kevin Cross
ID: 36516685
You want to assign it to variable during the execute.
e.g.,
intID = .ExecuteScalar()

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LVL 60

Expert Comment

by:Kevin Cross
ID: 36516694
Sorry, it has been awhile since I messed with ADODB. You are using the Command object, so there is only Execute. Principle is the same, but looks more like this:
oLastID = "SELECT MAX(ID) AS ID FROM Table1"
With cmd
    .CommandText = oLastID
    .CommandType = adCmdText
    .ActiveConnection = con
    Set rs = .Execute
End With

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Where rs is an ADODB.Recordset, so you can get at the ID (note: I added an alias to your SQL string) like rs("ID"). You could use the column index since there will be only one. The index array starts at 1 if I am not mistaken so rs(1) but can always try rs(0). *smile*
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Accepted Solution

by:
AgeOfEmpires earned 2000 total points
ID: 36517147
I typically use a command object if executing a stored procedure or a query that doesn't return info.  Otherwise I use a recordset to access the data.  I've not included any error checking for failed connection, incorrect query statements, etc.

Sub test()
  Dim sMyLastID As String
  Dim con As ADODB.Connection
  Dim rs As ADODB.Recordset
  
  Set con = New ADODB.Connection
  con.Open   ----your connection string here----
  
  Set rs = New ADODB.Recordset
  
  rs.Open "Select MAX(ID) From Table1", con, adOpenForwardOnly, adLockReadOnly
  If Not rs.EOF() Then
    sMyLastID = CStr(rs.Fields(0).Value)
    MsgBox "Max ID = " & sMyLastID
  Else
    MsgBox "Error processing query"
  End If
  
  rs.Close
  con.Close
  Set rs = Nothing
  Set con = Nothing
  
End Sub

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Author Closing Comment

by:Murray Brown
ID: 36517304
Thanks very much
0
 
LVL 4

Expert Comment

by:AgeOfEmpires
ID: 36517450
Glad I could help
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