Примеры методов Update и CancelUpdate (Visual Basic)Update and CancelUpdate Methods Example (VB)

В этом примере демонстрируется метод Update в сочетании с методом CancelUpdate .This example demonstrates the Update method in conjunction with the CancelUpdate method.

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  
    End If  
    ' show the resulting data  
    MsgBox "Data in recordset = " & rstEmployees!fname & " " & _  
    ' restore original data because this is a demonstration  
    If Not (strOldFirst = rstEmployees!fname And _  
           strOldLast = rstEmployees!lname) Then  
        rstEmployees!fname = strOldFirst  
        rstEmployees!lname = strOldLast  
    End If  
    ' clean up  
    Set rstEmployees = Nothing  
    Set Cnxn = Nothing  
    Exit Sub  
    ' 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  

В этом примере демонстрируется метод Update в сочетании с методом AddNew .This example demonstrates the Update method in conjunction with the AddNew method.

Attribute VB_Name = "Update"  

См. такжеSee Also

Метод CancelUpdate (ADO) CancelUpdate Method (ADO)
Объект Recordset (ADO) Recordset Object (ADO)
Метод UpdateUpdate Method