SqlTransaction.Commit SqlTransaction.Commit SqlTransaction.Commit SqlTransaction.Commit Method

Definizione

Esegue il commit della transazione di database.Commits the database transaction.

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

Implementazioni

Eccezioni

Si è verificato un errore durante il tentativo di eseguire il commit della transazione.An error occurred while trying to commit the transaction.

È già stato eseguito il rollback o il commit della transazione.The transaction has already been committed or rolled back.

-oppure--or-

La connessione non funziona.The connection is broken.

Esempi

Nell'esempio seguente vengono creati SqlConnection un oggetto SqlTransactione un oggetto.The following example creates a SqlConnection and a SqlTransaction. Viene inoltre illustrato come utilizzare i Commitmetodi, BeginTransactione. RollbackIt also demonstrates how to use the Commit, BeginTransaction, and Rollback methods. Viene eseguito il rollback della transazione in caso di errore.The transaction is rolled back on any error. Try/Catchla gestione degli errori viene utilizzata per gestire eventuali errori durante il tentativo di eseguire il commit o il rollback della transazione.Try/Catch error handling is used to handle any errors when attempting to commit or roll back the transaction.

private static void ExecuteSqlTransaction(string connectionString)
{
    using (SqlConnection connection = new SqlConnection(connectionString))
    {
        connection.Open();

        SqlCommand command = connection.CreateCommand();
        SqlTransaction transaction;

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

        // Must assign both transaction object and connection
        // to Command object for a pending local transaction
        command.Connection = connection;
        command.Transaction = transaction;

        try
        {
            command.CommandText =
                "Insert into Region (RegionID, RegionDescription) VALUES (100, 'Description')";
            command.ExecuteNonQuery();
            command.CommandText =
                "Insert into Region (RegionID, RegionDescription) VALUES (101, 'Description')";
            command.ExecuteNonQuery();

            // Attempt to commit the transaction.
            transaction.Commit();
            Console.WriteLine("Both records are written to database.");
        }
        catch (Exception ex)
        {
            Console.WriteLine("Commit Exception Type: {0}", ex.GetType());
            Console.WriteLine("  Message: {0}", ex.Message);

            // Attempt to roll back the transaction.
            try
            {
                transaction.Rollback();
            }
            catch (Exception ex2)
            {
                // This catch block will handle any errors that may have occurred
                // on the server that would cause the rollback to fail, such as
                // a closed connection.
                Console.WriteLine("Rollback Exception Type: {0}", ex2.GetType());
                Console.WriteLine("  Message: {0}", ex2.Message);
            }
        }
    }
}
Private Sub ExecuteSqlTransaction(ByVal connectionString As String)
    Using connection As New SqlConnection(connectionString)
        connection.Open()

        Dim command As SqlCommand = connection.CreateCommand()
        Dim transaction As SqlTransaction

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

        ' Must assign both transaction object and connection
        ' to Command object for a pending local transaction.
        command.Connection = connection
        command.Transaction = transaction

        Try
            command.CommandText = _
              "Insert into Region (RegionID, RegionDescription) VALUES (100, 'Description')"
            command.ExecuteNonQuery()
            command.CommandText = _
              "Insert into Region (RegionID, RegionDescription) VALUES (101, 'Description')"

            command.ExecuteNonQuery()

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

        Catch ex As Exception
            Console.WriteLine("Commit Exception Type: {0}", ex.GetType())
            Console.WriteLine("  Message: {0}", ex.Message)

            ' Attempt to roll back the transaction.
            Try
                transaction.Rollback()

            Catch ex2 As Exception
                ' This catch block will handle any errors that may have occurred
                ' on the server that would cause the rollback to fail, such as
                ' a closed connection.
                Console.WriteLine("Rollback Exception Type: {0}", ex2.GetType())
                Console.WriteLine("  Message: {0}", ex2.Message)
            End Try
        End Try
    End Using
End Sub

Commenti

Il Commit metodo è equivalente all'istruzione Transact-SQL COMMIT TRANSACTION.The Commit method is equivalent to the Transact-SQL COMMIT TRANSACTION statement. Non è possibile eseguire il rollback di una transazione dopo che è stato eseguito il commit, perché tutte le modifiche sono diventate una parte permanente del database.You cannot roll back a transaction once it has been committed, because all modifications have become a permanent part of the database. Per ulteriori informazioni, vedere Commit Transaction (Transact-SQL) .For more information, see COMMIT TRANSACTION (Transact-SQL) .

Nota

Try/Catchper eseguire il commit o il rollback di un, è necessario utilizzare SqlTransactionsempre la gestione delle eccezioni.Try/Catch exception handling should always be used when committing or rolling back a SqlTransaction. Sia Commit InvalidOperationException che Rollback generano un'istruzione se la connessione viene terminata o se è già stato eseguito il rollback della transazione nel server.Both Commit and Rollback generates an InvalidOperationException if the connection is terminated or if the transaction has already been rolled back on the server.

Per ulteriori informazioni sulle transazioni di SQL Server, vedere Transactions (Transact-SQL).For more information on SQL Server transactions, see Transactions (Transact-SQL).

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