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.


    '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
    Set rstAuthors = Nothing
    Set Cnxn = Nothing
    Exit Sub

    '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

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"