OleDbTransaction.Rollback メソッド

定義

トランザクションを保留状態からロールバックします。Rolls back a transaction from a pending state.

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

例外

トランザクションをコミットしようとしてエラーが発生しました。An error occurred while trying to commit the transaction.

トランザクションは既にコミットまたはロールバックされています。The transaction has already been committed or rolled back.

- または --or-

接続が切れています。The connection is broken.

次の例ではOleDbConnectionOleDbTransactionとを作成します。The following example creates an OleDbConnection and an OleDbTransaction. また、、、およびBeginTransaction Rollbackの各メソッドのCommit使用方法も示します。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

注釈

トランザクションは、保留状態からのみロールバックできます (がBeginTransaction呼び出された後、がCommit呼び出される前)。The transaction can only be rolled back from a pending state (after BeginTransaction has been called, but before Commit is called). トランザクションは、またCommit Rollbackはが呼び出される前に破棄されたイベントでロールバックされます。The transaction will be rolled back in the event it is disposed before Commit or Rollback is called.

適用対象

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