OleDbTransaction.Rollback OleDbTransaction.Rollback OleDbTransaction.Rollback OleDbTransaction.Rollback Method

Definición

Revierte una transacción desde un estado pendiente.Rolls back a transaction from a pending state.

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

Excepciones

Error al intentar confirmar la transacción.An error occurred while trying to commit the transaction.

Ya se confirmó o revirtió la transacción.The transaction has already been committed or rolled back.

O bien-or-

Se interrumpió la conexión.The connection is broken.

Ejemplos

En el ejemplo siguiente se OleDbConnection crea un OleDbTransactiony un.The following example creates an OleDbConnection and an OleDbTransaction. También se muestra cómo usar los BeginTransactionmétodos Commit, y Rollback .It also demonstrates how to use the BeginTransaction, a Commit, and Rollback methods.

public void ExecuteTransaction(string connectionString)
{
    using (OleDbConnection connection =
               new OleDbConnection(connectionString))
    {
        OleDbCommand command = new OleDbCommand();
        OleDbTransaction transaction = null;

        // Set the Connection to the new OleDbConnection.
        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 OleDbConnection(connectionString)
        Dim command As New OleDbCommand()
        Dim transaction As OleDbTransaction

        ' Set the Connection to the new OleDbConnection.
        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

Comentarios

Solo se puede revertir la transacción desde un estado pendiente (después BeginTransaction de llamar a, pero antes Commit de que se llame a).The transaction can only be rolled back from a pending state (after BeginTransaction has been called, but before Commit is called). La transacción se revertirá en caso de que se elimine antes Commit de que se llame a o. RollbackThe transaction will be rolled back in the event it is disposed before Commit or Rollback is called.

Se aplica a

Consulte también: