Save and Open Methods Example (VB)

These three examples demonstrate how the Save and Open methods can be used together.

Assume that you are going on a business trip and want to take along a table from a database. Before you go, you access the data as a Recordset and save it in a transportable form. When you arrive at your destination, you access the Recordset as a local, disconnected Recordset. You make changes to the Recordset, and then save it again. Finally, when you return home, you connect to the database again and update it with the changes you made on the road.

First, access and save the Authors table.

'BeginSaveVB  

    'To integrate this code  
    'replace the data source and initial catalog values  
    'in the connection string  

Public Sub Main()  
    On Error GoTo ErrorHandler  

    'recordset and connection variables  
    Dim rstAuthors As ADODB.Recordset  
    Dim Cnxn As ADODB.Connection  
    Dim strCnxn As String  
    Dim strSQLAuthors As String  

    ' Open connection  
    Set Cnxn = New ADODB.Connection  
    strCnxn = "Provider='sqloledb';Data Source='MySqlServer';" & _  
        "Initial Catalog='Pubs';Integrated Security='SSPI';"  
    Cnxn.Open strCnxn  

    Set rstAuthors = New ADODB.Recordset  
    strSQLAuthors = "SELECT au_id, au_lname, au_fname, city, phone FROM Authors"  
    rstAuthors.Open strSQLAuthors, Cnxn, adOpenDynamic, adLockOptimistic, adCmdText  

    'For sake of illustration, save the Recordset to a diskette in XML format  
    rstAuthors.Save "c:\Pubs.xml", adPersistXML  

    ' clean up  
    rstAuthors.Close  
    Cnxn.Close  
    Set rstAuthors = Nothing  
    Set Cnxn = Nothing  
    Exit Sub  

ErrorHandler:  
    'clean up  
    If Not rstAuthors Is Nothing Then  
        If rstAuthors.State = adStateOpen Then rstAuthors.Close  
    End If  
    Set rstAuthors = Nothing  

    If Not Cnxn Is Nothing Then  
        If Cnxn.State = adStateOpen Then Cnxn.Close  
    End If  
    Set Cnxn = Nothing  

    If Err <> 0 Then  
        MsgBox Err.Source & "-->" & Err.Description, , "Error"  
    End If  
End Sub  
'EndSaveVB  

At this point, you have arrived at your destination. You will access the Authors table as a local, disconnected Recordset. You must have the MSPersist provider on the computer that you are using to access the saved file, a:\Pubs.xml.

Attribute VB_Name = "Save"  

Finally, you return home. Now update the database with your changes.

Attribute VB_Name = "Save"  

See Also

Open Method (ADO Recordset)
Recordset Object (ADO)
More About Recordset Persistence
Save Method