IDbTransaction Interfaccia

Definizione

Rappresenta una transazione da eseguire in un'origine dati e viene implementata dai provider di dati .NET Framework che accedono a database relazionali.Represents a transaction to be performed at a data source, and is implemented by .NET Framework data providers that access relational databases.

public interface class IDbTransaction : IDisposable
public interface IDbTransaction : IDisposable
type IDbTransaction = interface
    interface IDisposable
Public Interface IDbTransaction
Implements IDisposable
Derivato
Implementazioni

Esempi

Nell'esempio seguente vengono create istanze delle classi derivate SqlTransaction, SqlConnection e.The following example creates instances of the derived classes, SqlConnection and SqlTransaction. Viene inoltre illustrato come utilizzare i BeginTransactionmetodi, Commite. RollbackIt also demonstrates how to use the BeginTransaction, Commit, and Rollback methods.

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

L' IDbTransaction interfaccia consente a una classe che eredita di implementare una classe di transazione, che rappresenta la transazione da eseguire in un'origine dati.The IDbTransaction interface allows an inheriting class to implement a Transaction class, which represents the transaction to be performed at a data source. Per ulteriori informazioni sulle classi di transazione, vedere transazioni e concorrenza.For more information about Transaction classes, see Transactions and Concurrency.

Un'applicazione non crea direttamente un'istanza dell' IDbTransaction interfaccia, ma crea un'istanza di una classe che eredita. IDbTransactionAn application does not create an instance of the IDbTransaction interface directly, but creates an instance of a class that inherits IDbTransaction.

Le classi che IDbTransaction ereditano devono implementare i membri ereditati e in genere definiscono membri aggiuntivi per aggiungere funzionalità specifiche del provider.Classes that inherit IDbTransaction must implement the inherited members, and typically define additional members to add provider-specific functionality. Ad esempio, l' IDbTransaction interfaccia definisce il Commit metodo.For example, the IDbTransaction interface defines the Commit method. A sua volta, OleDbTransaction la classe eredita questa proprietà e definisce anche il Begin metodo.In turn, the OleDbTransaction class inherits this property, and also defines the Begin method.

Note per gli implementatori

Per promuovere la coerenza tra .NET Framework provider di dati, denominare la classe che Prv eredita nella Prv transazione del modulo dove è il prefisso uniforme assegnato a tutte le classi in uno spazio dei nomi del provider di dati .NET Framework specifico.To promote consistency among .NET Framework data providers, name the inheriting class in the form Prv Transaction where Prv is the uniform prefix given to all classes in a specific .NET Framework data provider namespace. Ad esempio, Sql è il prefisso SqlTransaction della classe nello System.Data.SqlClient spazio dei nomi.For example, Sql is the prefix of the SqlTransaction class in the System.Data.SqlClient namespace.

Proprietà

Connection

Specifica l'oggetto Connection da associare alla transazione.Specifies the Connection object to associate with the transaction.

IsolationLevel

Specifica l'oggetto IsolationLevel per questa transazione.Specifies the IsolationLevel for this transaction.

Metodi

Commit()

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

Dispose()

Esegue attività definite dall'applicazione, come rilasciare o reimpostare risorse non gestite.Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.

(Ereditato da IDisposable)
Rollback()

Esegue il rollback di una transazione da uno stato in sospeso.Rolls back a transaction from a pending state.

Si applica a