PRB: Load From Stream Fails When Specifying MSPersist Provider

When you try to specify a connection string to use the persist provider to open from a valid ADO stream object, you receive the following error message:

When a stream is used to open a recordset, there should be no parameters specified other than the source parameter of the open method.

Remove any parameter other than the source of the recordset as follows:

If you want to reconnect to a connection to allow updating, you can associate an active connection after opening the Recordset.

This behavior is by design.

Steps to Reproduce Behavior

1. Start a new Visual Basic project. Form1 is created by default.
2. Add a Command button (Command1) to Form1.
3. Add a Reference to Microsoft ActiveX Data Objects 2.x Library.
4. Paste the following code in the general declaration section of Form1.
   
   Note You must change User ID <User ID> and password <Strong Password> to the correct values. Make sure that User ID has the appropriate permissions to perform this operation on the database.

   Option Explicit
   Dim rs As ADODB.Recordset
   Dim stm As ADODB.Stream
   
   Private Sub Persist_To_XML_File()
   
       Set rs = New Recordset
   
       If Dir("C:\MyFile.xml") <> "" Then
           Kill "C:\MyFile.xml"
       End If
       
       rs.Open "SELECT * FROM authors", "DSN=pubs;uid=<User ID>;pwd=<Strong Password>;", _
                adOpenStatic, adLockReadOnly, adCmdText
       rs.Save "C:\MyFile.xml", adPersistXML
   
       MsgBox ("XML file was created successfully!")
   
       rs.Close
       Set rs = Nothing
   
   End Sub
   
   
   Private Sub Command1_Click()
       
       ' Create an XML file via the Authors table in Pubs
       Persist_To_XML_File
       
       ' Populate the recordset by opening a Stream object
       MsgBox ("Now.. will populate the recordset by opening a Stream object")
       Load_RS_From_Stream
       MsgBox ("Process was done successfully!")
       
   End Sub
   
   Sub Load_RS_From_Stream()
       
      Set rs = New Recordset
      Set stm = New ADODB.Stream
      
      stm.Open         ' Open a stream object
      stm.Charset = "iso-8859-1"   ' character set strings code for ANSI, ASCII
      'Load a Stream object from the XML file
      stm.LoadFromFile "C:\MyFile.xml"
      
      ' Uncommenting the connection string in the following line generates error 3001
      rs.Open stm ', "Provider=MsPersist"
   
      While Not rs.EOF             'Get first field for all records in the recordset
          Debug.Print rs(0)
          rs.MoveNext
      Wend
      
      stm.Close
      Set stm = Nothing
      
      rs.Close
      Set rs = Nothing
   
   End Sub
   					

5. Run the code to notice the behavior.

For more information on the recordset persistence, please refer to the Platform SDK for Windows 2000 or to the MSDN Library online.