IDbTransaction Interfaz

Definición

Representa una transacción para realizar en un origen de datos y se implementa mediante proveedores de datos de .NET Framework que acceden a bases de datos relacionales.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
Derivado
Implementaciones

Ejemplos

En el ejemplo siguiente se crean instancias de las clases derivadas SqlConnection y SqlTransaction.The following example creates instances of the derived classes, SqlConnection and SqlTransaction. También se muestra cómo usar los métodos BeginTransaction, Commity Rollback.It 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

Comentarios

La interfaz de IDbTransaction permite que una clase heredada implemente una clase de transacción, que representa la transacción que se va a realizar en un origen de datos.The IDbTransaction interface allows an inheriting class to implement a Transaction class, which represents the transaction to be performed at a data source. Para obtener más información sobre las clases de transacción, consulte transacciones y simultaneidad.For more information about Transaction classes, see Transactions and Concurrency.

Una aplicación no crea una instancia de la interfaz IDbTransaction directamente, sino que crea una instancia de una clase que hereda IDbTransaction.An application does not create an instance of the IDbTransaction interface directly, but creates an instance of a class that inherits IDbTransaction.

Las clases que heredan IDbTransaction deben implementar los miembros heredados y, normalmente, definir miembros adicionales para agregar funcionalidad específica del proveedor.Classes that inherit IDbTransaction must implement the inherited members, and typically define additional members to add provider-specific functionality. Por ejemplo, la interfaz IDbTransaction define el método Commit.For example, the IDbTransaction interface defines the Commit method. A su vez, la clase OleDbTransaction hereda esta propiedad y también define el método Begin.In turn, the OleDbTransaction class inherits this property, and also defines the Begin method.

Notas a los implementadores

Para promover la coherencia entre .NET Framework proveedores de datos, asigne un nombre a la clase heredera en el formulario Prv transacción, donde Prv es el prefijo uniforme dado a todas las clases de un espacio de nombres de proveedor de datos de .NET Framework específico.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. Por ejemplo, Sql es el prefijo de la clase SqlTransaction en el espacio de nombres System.Data.SqlClient.For example, Sql is the prefix of the SqlTransaction class in the System.Data.SqlClient namespace.

Propiedades

Connection

Especifica el objeto de conexión que se va a asociar a la transacción.Specifies the Connection object to associate with the transaction.

IsolationLevel

Especifica IsolationLevel para esta transacción.Specifies the IsolationLevel for this transaction.

Métodos

Commit()

Confirma la transacción de base de datos.Commits the database transaction.

Dispose()

Realiza tareas definidas por la aplicación asociadas a la liberación o al restablecimiento de recursos no administrados.Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.

(Heredado de IDisposable)
Rollback()

Revierte una transacción desde un estado pendiente.Rolls back a transaction from a pending state.

Se aplica a