testADOEvents.py
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from win32com.client import Dispatch, DispatchWithEvents, constants
import pythoncom
import os
import time
finished = 0 # Flag for the wait loop from (3) to test
class ADOEvents: # event handler class
def OnWillConnect(self, str, user, pw, opt, sts, cn):
# Must have this event, as if it is not handled, ADO assumes the
# operation is cancelled, and raises an error (Operation cancelled
# by the user)
pass
def OnConnectComplete(self, error, status, connection):
# Assume no errors, until we have the basic stuff
# working. Now, "connection" should be an open
# connection to my data source
# Do the "something" from (2). For now, just
# print the connection data source
print "connection is", connection
print "Connected to", connection.Properties("Data Source")
# OK, our work is done. Let the main loop know
global finished
finished = 1
def OnCommitTransComplete(self, pError, adStatus, pConnection):
pass
def OnInfoMessage(self, pError, adStatus, pConnection):
pass
def OnDisconnect(self, adStatus, pConnection):
pass
def OnBeginTransComplete(self, TransactionLevel, pError, adStatus, pConnection):
pass
def OnRollbackTransComplete(self, pError, adStatus, pConnection):
pass
def OnExecuteComplete(self, RecordsAffected, pError, adStatus, pCommand, pRecordset, pConnection):
pass
def OnWillExecute(self, Source, CursorType, LockType, Options, adStatus, pCommand, pRecordset, pConnection):
pass
def TestConnection(dbname):
# Create the ADO connection object, and link the event
# handlers into it
c = DispatchWithEvents("ADODB.Connection", ADOEvents)
# Initiate the asynchronous open
dsn = "Driver={Microsoft Access Driver (*.mdb)};Dbq=%s" % dbname
user = "system"
pw = "manager"
c.Open(dsn, user, pw, constants.adAsyncConnect)
# Sit in a loop, until our event handler (above) sets the
# "finished" flag or we time out.
end_time = time.clock() + 10
while time.clock() < end_time:
# Pump messages so that COM gets a look in
pythoncom.PumpWaitingMessages()
if not finished:
print "XXX - Failed to connect!"
def Test():
import testAccess
try:
testAccess.GenerateSupport()
except pythoncom.com_error:
print "*** Can not import the MSAccess type libraries - tests skipped"
return
dbname = testAccess.CreateTestAccessDatabase()
try:
TestConnection(dbname)
finally:
os.unlink(dbname)
if __name__=='__main__':
Test()