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Update and CancelUpdate Methods Example (VB)

This example demonstrates the Update method in conjunction with the CancelUpdate method.

'BeginUpdateVB
Public Sub Main()
    On Error GoTo ErrorHandler

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

    ' recordset and connection variables
    Dim rstEmployees As ADODB.Recordset
    Dim Cnxn As ADODB.Connection
    Dim strCnxn As String
    Dim strSQLEmployees As String
     ' buffer variables
    Dim strOldFirst As String
    Dim strOldLast As String
    Dim strMessage As String
    
    ' Open connection
    Set Cnxn = New ADODB.Connection
    strCnxn = "Provider='sqloledb';Data Source='MySqlServer';" & _
        "Initial Catalog='Pubs';Integrated Security='SSPI';"
    Cnxn.Open strCnxn
     
    ' Open recordset to enable changes
    Set rstEmployees = New ADODB.Recordset
    strSQLEmployees = "SELECT fname, lname FROM Employee ORDER BY lname"
    rstEmployees.Open strSQLEmployees, Cnxn, adOpenKeyset, adLockOptimistic, adCmdText
    
    ' Store original data
    strOldFirst = rstEmployees!fname
    strOldLast = rstEmployees!lname
    ' Change data in edit buffer
    rstEmployees!fname = "Linda"
    rstEmployees!lname = "Kobara"
    
    ' Show contents of buffer and get user input
    strMessage = "Edit in progress:" & vbCr & _
        "  Original data = " & strOldFirst & " " & _
        strOldLast & vbCr & "  Data in buffer = " & _
        rstEmployees!fname & " " & rstEmployees!lname & vbCr & vbCr & _
        "Use Update to replace the original data with " & _
        "the buffered data in the Recordset?"
    
    If MsgBox(strMessage, vbYesNo) = vbYes Then
        rstEmployees.Update
    Else
        rstEmployees.CancelUpdate
    End If
    
    ' show the resulting data
    MsgBox "Data in recordset = " & rstEmployees!fname & " " & _
       rstEmployees!lname
    
    ' restore original data because this is a demonstration
    If Not (strOldFirst = rstEmployees!fname And _
           strOldLast = rstEmployees!lname) Then
        rstEmployees!fname = strOldFirst
        rstEmployees!lname = strOldLast
        rstEmployees.Update
    End If
   
    ' clean up
    rstEmployees.Close
    Cnxn.Close
    Set rstEmployees = Nothing
    Set Cnxn = Nothing
    Exit Sub
    
ErrorHandler:
    ' clean up
    If Not rstEmployees Is Nothing Then
        If rstEmployees.State = adStateOpen Then rstEmployees.Close
    End If
    Set rstEmployees = 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
' EndUpdateVB

This example demonstrates the Update method in conjunction with the AddNew method.

Attribute VB_Name = "Update"
Show:
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