Hvorfor virker UPDATE ikke?

Min kode (som virker op imod en MS Access database):

-----------------------------------------------------
objConn.Open strConn
Set objRS = Server.CreateObject("ADODB.Recordset")
Set objRS.ActiveConnection = objConn

objRS.CursorLocation = adUseServer
objRS.CursorType = adOpenKeyset
objRS.LockType = adLockOptimistic

strQ = "SELECT * FROM Tabel WHERE Tabel.ID = 100;"

objRS.Open strQ

objRS("Felt") = "test"

objRS.Update

objRS.Close   
objConn.close
set objConn = Nothing
-----------------------------------------------------

HVORFOR virker dette ikke op imod en mySQL database?

Jeg får nemlig følgende fejl:
-----------------------------------------------------
Microsoft OLE DB Provider for ODBC Drivers error '80040e21'

Multiple-step OLE DB operation generated errors. Check each OLE DB status value, if available. No work was done.

/program.asp, line 56
-----------------------------------------------------

Den fejler i UPDATE linjen!

Please help! ;o)