Microsoft KB Archive/172313

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Article ID: 172313

Article Last Modified on 3/2/2005


  • Microsoft Visual Basic 5.0 Enterprise Edition

This article was previously published under Q172313


When connecting to an Oracle database using DAO and ODBCDirect, the application hangs when an Insert statement is within a Begin/Commit Transaction and that procedure is called the second time.


This is caused by a known problem in the Microsoft ODBC Driver for Oracle, Msorcl10.dll, version 1.0.


To work around this problem the QueryTimeout property of the Connection object must be set to zero (0). Uncomment the following line of code to make the example run without error:

   Cn.QueryTimeout = 0


Microsoft has confirmed this to be a problem in the Microsoft ODBC Driver for Oracle, Msorcl10.dll. This issue has been resolved with the 2.0, or higher, version of the Microsoft Oracle ODBC Driver. This driver can be obtained in Visual Studio 5.0 and higher, MDAC 1.5 or higher, and the Data Access Software Development Kit (SDK).


Steps to Reproduce Behavior

  1. Create a Standard EXE project with two Command Buttons on the new Form.
  2. Add this code to the General Declarations section:

          Option Explicit
          Dim Ws As Workspace
          Dim Cn As Connection
          ' Note that the parameters in the connection string must be changed
          ' to match your configration.
          Private Sub Command1_Click()
             On Error Resume Next
             MousePointer = vbHourglass
             Cn.Execute "DROP TABLE CODETEST"
             MousePointer = vbNormal
             MsgBox "Table Created"
          End Sub
          Private Sub Command2_Click()
          Dim strSQL As String
          Dim Qd As QueryDef
          Dim txtValue As String
          txtValue = "abc"
             strSQL = "insert into codetest (code) values ('" & txtValue & "')"
             Set Qd = Cn.CreateQueryDef("", strSQL)
             Qd.Execute  'Fails here the second time
             If (Err.Number <> 0) Then
                 MsgBox ("[cmdExecute_Click] - " + Err.Description)
             End If
          MsgBox "Click me again and I will crash"
          End Sub
          Private Sub Form_Load()
          Dim strConn As String
             Command1.Caption = "Create Table"
             Command2.Caption = "Enter Data"
             'Replace <data source name>, <user ID>, and <password> with the
             'DSN, user ID, and password for your Oracle system.
             strConn = "odbc;dsn=<data source name>; _
             uid=<user ID>;pwd=<password>"
             Set Ws = CreateWorkspace("", "admin", "", dbUseODBC)
             Set Cn = Ws.OpenConnection("", dbDriverNoPrompt, False, strConn)
            'Cn.QueryTimeout = 0 ' This is the workaround line of code
          End Sub
          Private Sub Form_Unload(Cancel As Integer)
          End Sub
  3. Change the , <user ID>, and <password> in the connect string (strConn) to the DSN, user ID, and password for your Oracle system.
  4. Save the Project.
  5. Run the Project by pressing F5.
  6. Click on the Create Table button (The user database may have to be changed in the code to match your setup).
  7. Click on the Enter Data button. The first time one record is inserted. Clicking on the "Enter Data" button the second time will hang the application. Go into the Task Manager (CNTL, ALT, DELETE) to Exit the app.

Additional query words: kbODBC kbOracle kbDatabase kbDriver kbVB kbDAO

Keywords: kbbug kbfix kbodbc200fix kboracle kbdriver kbmdacnosweep KB172313