OleDbTransaction.Rollback Metode

Definisi

Ruang nama:

System.Data.OleDb

Rakitan:

System.Data.OleDb.dll

Paket:

System.Data.OleDb v9.0.0-preview.4.24266.19

Sumber:

OleDbTransaction.cs

Mengembalikan transaksi dari status tertunda.

public:
 override void Rollback();

public override void Rollback ();

override this.Rollback : unit -> unit

Public Overrides Sub Rollback ()

Pengecualian

Exception

Terjadi kesalahan saat mencoba melakukan transaksi.

InvalidOperationException

Transaksi telah dilakukan atau digulung balik.

-atau-

Koneksi terputus.

Contoh

Contoh berikut membuat OleDbConnection dan OleDbTransaction. Ini juga menunjukkan cara menggunakan BeginTransactionmetode , , Commitdan Rollback .

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

Keterangan

Transaksi hanya dapat digulung balik dari status tertunda (setelah BeginTransaction dipanggil, tetapi sebelumnya Commit dipanggil). Transaksi akan digulung balik jika dibuang sebelum Commit atau Rollback dipanggil.

Lihat juga

• Melakukan Transaksi