OracleTransaction.Rollback-Methode

Führt einen Rollback einer noch ausstehenden Transaktion aus.

Namespace: System.Data.OracleClient
Assembly: System.Data.OracleClient (in system.data.oracleclient.dll)

Syntax

'Declaration
Public Overrides Sub Rollback
'Usage
Dim instance As OracleTransaction

instance.Rollback

public override void Rollback ()

public:
virtual void Rollback () override

public void Rollback ()

public override function Rollback ()

Ausnahmen

Hinweise

Ein Rollback der Transaktion kann nur ausgeführt werden, wenn diese noch aussteht (nach dem Aufruf von BeginTransaction, jedoch vor dem Aufruf von Commit).

Beispiel

Im folgenden Beispiel werden eine OracleConnection und eine OracleTransaction erstellt. Darüber hinaus wird die Verwendung der Methoden BeginTransaction, Commit und Rollback veranschaulicht.

Public Sub RunOracleTransaction(ByVal connectionString As String)
    Using connection As New OracleConnection(connectionString)
        connection.Open()

        Dim command As OracleCommand = connection.CreateCommand()
        Dim transaction As OracleTransaction

        ' Start a local transaction
        transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)
        ' Assign transaction object for a pending local transaction
        command.Transaction = transaction

        Try
            command.CommandText = _
                "INSERT INTO Dept (DeptNo, Dname, Loc) values (50, 'TECHNOLOGY', 'DENVER')"
            command.ExecuteNonQuery()
            command.CommandText = _
                "INSERT INTO Dept (DeptNo, Dname, Loc) values (60, 'ENGINEERING', 'KANSAS CITY')"
            command.ExecuteNonQuery()
            transaction.Commit()
            Console.WriteLine("Both records are written to database.")
        Catch e As Exception
            transaction.Rollback()
            Console.WriteLine(e.ToString())
            Console.WriteLine("Neither record was written to database.")
        End Try
    End Using
End Sub

public void RunOracleTransaction(string connectionString)
{
    using (OracleConnection connection = new OracleConnection(connectionString))
    {
        connection.Open();

        OracleCommand command = connection.CreateCommand();
        OracleTransaction transaction;

        // Start a local transaction
        transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted);
        // Assign transaction object for a pending local transaction
        command.Transaction = transaction;

        try
        {
            command.CommandText = 
                "INSERT INTO Dept (DeptNo, Dname, Loc) values (50, 'TECHNOLOGY', 'DENVER')";
            command.ExecuteNonQuery();
            command.CommandText = 
                "INSERT INTO Dept (DeptNo, Dname, Loc) values (60, 'ENGINEERING', 'KANSAS CITY')";
            command.ExecuteNonQuery();
            transaction.Commit();
            Console.WriteLine("Both records are written to database.");
        }
        catch (Exception e)
        {
            transaction.Rollback();
            Console.WriteLine(e.ToString());
            Console.WriteLine("Neither record was written to database.");
        }
    }
}

using System;
using System.Data;
using System.Data.OracleClient;

class Class1
{
    static void Main()
    {
    }

    public void RunOracleTransaction(string connectionString)
    {
        using (OracleConnection connection = new OracleConnection(connectionString))
        {
            connection.Open();

            OracleCommand command = connection.CreateCommand();
            OracleTransaction transaction;

            // Start a local transaction
            transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted);
            // Assign transaction object for a pending local transaction
            command.Transaction = transaction;

            try
            {
                command.CommandText = 
                    "INSERT INTO Dept (DeptNo, Dname, Loc) values (50, 'TECHNOLOGY', 'DENVER')";
                command.ExecuteNonQuery();
                command.CommandText = 
                    "INSERT INTO Dept (DeptNo, Dname, Loc) values (60, 'ENGINEERING', 'KANSAS CITY')";
                command.ExecuteNonQuery();
                transaction.Commit();
                Console.WriteLine("Both records are written to database.");
            }
            catch (Exception e)
            {
                transaction.Rollback();
                Console.WriteLine(e.ToString());
                Console.WriteLine("Neither record was written to database.");
            }
        }
    }

Plattformen

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.

Versionsinformationen

.NET Framework

Unterstützt in: 2.0, 1.1

Siehe auch

Referenz

OracleTransaction-Klasse
OracleTransaction-Member
System.Data.OracleClient-Namespace
Commit
BeginTransaction