Microsoft KB Archive/172592

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Article ID: 172592

Article Last Modified on 7/2/2004


  • Microsoft Visual Basic 5.0 Enterprise Edition
  • Microsoft Visual Basic 6.0 Enterprise Edition
  • Microsoft Visual Basic 4.0 32-Bit Enterprise Edition

This article was previously published under Q172592


FoxPro 2.x tables can be opened as read/write under DAO. Following the same procedure for Visual FoxPro tables will open the tables as read only. ISAM drivers are being used under DAO. The following method will open free tables and tables that are part of a Visual FoxPro database as read/write with RDO. In addition to providing read/write access to these files, the ODBC driver also provides greater performance than the Installable ISAM driver.

If data validity checks are not made, Visual FoxPro database integrity could be violated for tables that are part of a database.


  1. Create a form with two text boxes and 5 CommandButtons. Be sure to select the Remote Data Object under References for the Project.
  2. Place the following captions on command1 through command5 buttons:

  3. Place the following code in the General Declarations section of the form's code:

          Option Explicit
          Dim cn As New rdoConnection
          Dim rs As rdoResultset
          Dim SQL As String
          Private Sub Command1_Click()
          End Sub
          Private Sub Command2_Click()
            rs(1) = Text2.Text
          End Sub
          Private Sub Command3_Click()
            Set rs = Nothing
            Set cn = Nothing
            Unload Me
          End Sub
          Private Sub Command4_Click()
             If Not (rs.EOF) Then
               Text1.Text = rs(0)
               Text2.Text = rs(1)
           End If
         End Sub
          Private Sub Command5_Click()
            If Not (rs.BOF) Then
               Text1.Text = rs(0)
               Text2.Text = rs(1)
            End If
          End Sub
          Private Sub Form_Load()
            ' Using a DSN-less connection to open a free table
            cn.Connect = "SourceType=DBF;" _
                & "SourceDB=C:\Vfp\Samples\Data;" _
                & "Driver={Microsoft Visual FoxPro Driver}"
            cn.CursorDriver = rdUseOdbc
            cn.EstablishConnection "rdDriverNoPrompt"
            SQL = "select * from customer"   'this should be a free table
            Set rs = cn.OpenResultset(SQL, rdOpenKeyset, rdConcurRowVer)
            Text1.Text = rs(0)
            Text2.Text = rs(1)
          End Sub
  4. Press the F5 key to run the form. Make changes by editing text box 2, pressing edit, and then updating. Verify that changes have been made to the table by running the form several times.

NOTE: The Source in the connect statement above will need to be altered for your system. Source points to a directory containing the table.


For more information explaining why Visual FoxPro Databases are opened as read-only under DAO, please see the following article in the Microsoft Knowledge Base:

161307 : How To Use Visual FoxPro Tables in Visual Basic 4.0

For more information on using DSN-Less connections, please see the following article in the Microsoft Knowledge Base:

147875 : How To Use "DSN-Less" ODBC Connections with RDO and DAO

Additional query words: kbVBp500 kbVBp600 kbdse kbDSupport kbVBp kbVBp400 kbDAO kbVFP200

Keywords: kbhowto KB172592