FIX: "Object invalid or no longer set" Error with Microsoft Jet

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When opening and closing connections or recordsets using the Microsoft ODBC Driver for Access or the Microsoft OLE DB Provider for Jet, the following error may be reported:
Object invalid or no longer set.
After this error is reported, no more recordsets or connections can be opened from the same process.

Other possible error messages reported to the client application include:
Too many tables open.
Cannot open any more tables.


To resolve this problem, install the latest Microsoft Jet 4.0 service pack 6. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

239114 How To: Obtain the Latest Service Pack for the Microsoft Jet 4.0 Database Engine


Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was fixed in Jet 4.0 Service Pack 6 (SP6).

More Information

To reproduce the problem, run the following Microsoft Visual Basic for Applications (VBA) code:
Public Sub Jet_TableID_Repro()
Dim conn As ADODB.Connection
Dim cmd As ADODB.Command
Dim rs As ADODB.recordset
Dim i As Long

Set conn = New ADODB.Connection
' Modify this connection string to point to some blank database.
conn.Open "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\YourTestDatabase.mdb;"

' Drop and re-create test query.
On Error Resume Next
conn.Execute "drop procedure sp_param_test", , adExecuteNoRecords
On Error GoTo 0
conn.Execute "create procedure sp_param_test as " & _
"parameters iInput Long; " & _
"select iInput as iOutput;", , adExecuteNoRecords

For i = 1 To 10000

' Code should fail at around 2000-3000 iterations.
Set rs = New ADODB.recordset
Set cmd = New ADODB.Command
Set cmd.ActiveConnection = conn
cmd.CommandType = adCmdStoredProc
cmd.CommandText = "sp_param_test"
cmd.Parameters.Append cmd.CreateParameter("iInput", adInteger)
cmd.Parameters(0).value = 12

' This will fail at around 2000-3000 iterations.
rs.Open cmd, , adOpenKeyset, adLockOptimistic
Set cmd = Nothing
Debug.Print i
Set rs = Nothing

Next i

End Sub

ID articolo: 304536 - Ultima revisione: 19 giu 2014 - Revisione: 1