Save and Open methods example (VB)

Applies to: Access 2013, Office 2013

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

Assume 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, 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. Don't forget you must have the MSPersist provider on the machine that you are using in order to access the saved file, a:\Pubs.xml.

 
'BeginSave2VB 
Public Sub Main() 
 On Error GoTo ErrorHandler 
 
 Dim rst As ADODB.Recordset 
 Set rst = New ADODB.Recordset 
 
 'For sake of illustration, we specify all parameters 
 rst.Open "c:\Pubs.xml", "Provider=MSPersist;", adOpenForwardOnly, adLockBatchOptimistic, adCmdFile 
 
 'Now you have a local, disconnected Recordset - Edit as you desired 
 '(In this example the change makes no difference) 
 rst.Find "au_lname = 'Carson'" 
 If rst.EOF Then 
 Debug.Print "Name not found." 
 Exit Sub 
 End If 
 
 rst!city = "Chicago" 
 rst.Update 
 
 'Save changes in ADTG format this time, purely for sake of illustration. 
 'Note that the previous version is still on the diskette, as a:\Pubs.xml. 
 rst.Save "c:\Pubs.adtg", adPersistADTG 
 
 ' clean up 
 rst.Close 
 Set rst = Nothing 
 Exit Sub 
 
ErrorHandler: 
 'clean up 
 If Not rst Is Nothing Then 
 If rst.State = adStateOpen Then rst.Close 
 End If 
 Set rst = Nothing 
 
 If Err <> 0 Then 
 MsgBox Err.Source & "-->" & Err.Description, , "Error" 
 End If 
End Sub 
'EndSave2VB 

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

 
'BeginSave3VB 
Public Sub Main() 
 On Error GoTo ErrorHandler 
 
 'To integrate this code 
 'replace the data source and initial catalog values 
 'in the connection string 
 
 Dim Cnxn As New ADODB.Connection 
 Dim rst As ADODB.Recordset 
 Dim strCnxn As String 
 
 Set rst = New ADODB.Recordset 
 ' The lock mode is batch optimistic because we are going to 
 ' use the UpdateBatch method. 
 rst.Open "c:\Pubs.adtg", "Provider=MSPersist;", adOpenForwardOnly, adLockBatchOptimistic, adCmdFile 
 
 ' Connect to the database, associate the Recordset with the connection 
 ' then update the database table with the changed Recordset 
 strCnxn = "Provider=SQLOLEDB;Data Source=MySqlServer;Integrated Security=SSPI;Initial Catalog=pubs;" 
 Cnxn.Open strCnxn 
 
 rst.ActiveConnection = Cnxn 
 rst.UpdateBatch 
 
 ' clean up 
 rst.Close 
 Cnxn.Close 
 Set rst = Nothing 
 Set Cnxn = Nothing 
 Exit Sub 
 
ErrorHandler: 
 'clean up 
 If Not rst Is Nothing Then 
 If rst.State = adStateOpen Then rst.Close 
 End If 
 Set rst = 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 
'EndSave3VB