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OdbcTransaction.Rollback Yöntem

Tanım

Bekleyen durumdan bir işlemi geri alır.

public:
 override void Rollback();
public:
 virtual void Rollback();
public override void Rollback ();
public void Rollback ();
override this.Rollback : unit -> unit
abstract member Rollback : unit -> unit
override this.Rollback : unit -> unit
Public Overrides Sub Rollback ()
Public Sub Rollback ()

Uygulamalar

Özel durumlar

İşlem işlemeye çalışılırken bir hata oluştu.

İşlem zaten kaydedilmiş veya geri alınmış.

-veya-

Bağlantı kesildi.

Örnekler

Aşağıdaki örnek bir OdbcConnection ve OdbcTransactionoluşturur. Ayrıca , Commitve Rollback yöntemlerinin BeginTransactionnasıl kullanılacağını da gösterir.

public static void ExecuteTransaction(string connectionString)
{
    using (OdbcConnection connection =
               new OdbcConnection(connectionString))
    {
        OdbcCommand command = new OdbcCommand();
        OdbcTransaction transaction = null;

        // Set the Connection to the new OdbcConnection.
        command.Connection = connection;

        // Open the connection and execute the transaction.
        try
        {
            connection.Open();

            // Start a local transaction
            transaction = connection.BeginTransaction();

            // Assign transaction object for a pending local transaction.
            command.Connection = connection;
            command.Transaction = transaction;

            // Execute the commands.
            command.CommandText =
                "Insert into Region (RegionID, RegionDescription) VALUES (100, 'Description')";
            command.ExecuteNonQuery();
            command.CommandText =
                "Insert into Region (RegionID, RegionDescription) VALUES (101, 'Description')";
            command.ExecuteNonQuery();

            // Commit the transaction.
            transaction.Commit();
            Console.WriteLine("Both records are written to database.");
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
            try
            {
                // Attempt to roll back the transaction.
                transaction.Rollback();
            }
            catch
            {
                // Do nothing here; transaction is not active.
            }
        }
        // The connection is automatically closed when the
        // code exits the using block.
    }
}
Public Sub ExecuteTransaction(ByVal connectionString As String)

    Using connection As New OdbcConnection(connectionString)
        Dim command As New OdbcCommand()
        Dim transaction As OdbcTransaction

        ' Set the Connection to the new OdbcConnection.
        command.Connection = connection

        ' Open the connection and execute the transaction.
        Try
            connection.Open()

            ' Start a local transaction.
            transaction = connection.BeginTransaction()

            ' Assign transaction object for a pending local transaction.
            command.Connection = connection
            command.Transaction = transaction

            ' Execute the commands.
            command.CommandText =
                "Insert into Region (RegionID, RegionDescription) VALUES (100, 'Description')"
            command.ExecuteNonQuery()
            command.CommandText =
                "Insert into Region (RegionID, RegionDescription) VALUES (101, 'Description')"
            command.ExecuteNonQuery()

            ' Commit the transaction.
            transaction.Commit()
            Console.WriteLine("Both records are written to database.")

        Catch ex As Exception
            Console.WriteLine(ex.Message)
            ' Try to rollback the transaction
            Try
                transaction.Rollback()

            Catch
                ' Do nothing here; transaction is not active.
            End Try
        End Try
        ' The connection is automatically closed when the
        ' code exits the Using block.
    End Using
End Sub

Açıklamalar

İşlem yalnızca bekleme durumundan geri alınabiliyor (çağrıldıktan sonra BeginTransaction ancak çağrılmadan önce Commit ). İşlem, daha önce Commit atılması veya Rollback çağrılması durumunda geri alınır.

Şunlara uygulanır

Ayrıca bkz.