Cancels execution of a pending asynchronous method call (ODBCDirect workspaces only).
Syntax
expression .Cancel
expression A variable that represents a Connection object.
Remarks
Use the Cancel method to terminate execution of an asynchronous Execute or OpenConnection method call (that is, the method was invoked with the dbRunAsync option). Cancel will return a run-time error if dbRunAsync was not used in the method you're trying to terminate.
An error will occur if, following a Cancel method call, you try to reference the object that would have been created by an asynchronous OpenConnection call (that is, the Connection object from which you called the Cancel method).
Example
This example uses the StillExecuting property and the Cancel method to asynchronously open a Connection object.
Sub CancelConnectionX()
Dim wrkMain As Workspace
Dim conMain As Connection
Dim sngTime As Single
Set wrkMain = CreateWorkspace("ODBCWorkspace", _
"admin", "", dbUseODBC)
' Open the connection asynchronously.
' Note: The DSN referenced below must be configured to
' use Microsoft Windows NT Authentication Mode to
' authorize user access to the Microsoft SQL Server.
Set conMain = wrkMain.OpenConnection("Publishers", _
dbDriverNoPrompt + dbRunAsync, False, _
"ODBC;DATABASE=pubs;DSN=Publishers")
sngTime = Timer
' Wait five seconds.
Do While Timer - sngTime < 5
Loop
' If the connection has not been made, ask the user
' if she wants to keep waiting. If she does not, cancel
' the connection and exit the procedure.
Do While conMain.StillExecuting
If MsgBox("No connection yet--keep waiting?", _
vbYesNo) = vbNo Then
conMain.Cancel
MsgBox "Connection cancelled!"
wrkMain.Close
Exit Sub
End If
Loop
With conMain
' Use the Connection object conMain.
.Close
End With
wrkMain.Close
End Sub