SqlTransaction Classe

Definição

public ref class SqlTransaction sealed : MarshalByRefObject, IDisposable, System::Data::IDbTransaction

public ref class SqlTransaction sealed : System::Data::Common::DbTransaction

public sealed class SqlTransaction : MarshalByRefObject, IDisposable, System.Data.IDbTransaction

public sealed class SqlTransaction : System.Data.Common.DbTransaction

type SqlTransaction = class
    inherit MarshalByRefObject
    interface IDbTransaction
    interface IDisposable

type SqlTransaction = class
    inherit DbTransaction

Public NotInheritable Class SqlTransaction
Inherits MarshalByRefObject
Implements IDbTransaction, IDisposable

Public NotInheritable Class SqlTransaction
Inherits DbTransaction

Herança

Object

MarshalByRefObject

SqlTransaction

Herança

Object

MarshalByRefObject

DbTransaction

SqlTransaction

Implementações

IDbTransaction IDisposable

Exemplos

O exemplo seguinte cria um SqlConnection e um SqlTransaction. Também demonstra como usar os BeginTransactionmétodos , Commit, e Rollback . A transação é revertida em caso de erro ou se for descartada sem ter sido previamente confirmada. Try / Catch O tratamento de erros é usado para tratar quaisquer erros ao tentar comprometer ou reverter a transação.

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();

        // 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()

        ' 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

Observações

A aplicação cria um SqlTransaction objeto ao chamar BeginTransaction o SqlConnection objeto. Todas as operações subsequentes associadas à transação (por exemplo, confirmar ou abortar a transação) são realizadas no SqlTransaction objeto.

Para mais informações sobre transações SQL Server, consulte Transações Explícitas e Transações Eficientes de Codificação.

Ver também

• Transações Locais
• Visão geral ADO.NET