Verteilte Transaktionen für heterogene Datenbanken in MS .NET

1. Einzeltransaktion.
2. Es können verschiedene Datenbanken wie Oracle, MS SQL Server und PostgreSQL sein.
3. Die Reaktion auf eine CRUD-Operation kann erheblich sein.
4. Die Insertionssequenz ist nicht wichtig.

static public int CreateTransactionScope(
    string connectString1, string connectString2,
    string commandText1, string commandText2)
{
    //        StringWriter   
   // .
    int returnValue = 0;
    System.IO.StringWriter writer = new System.IO.StringWriter();

    try
    {
        //  TransactionScope   , 
        //            
        //  .
        using (TransactionScope scope = new TransactionScope())
        {
            using (SqlConnection connection1 = new SqlConnection(connectString1))
            {
                //      
                // TransactionScope   .
                connection1.Open();

                //   SqlCommand    .
                SqlCommand command1 = new SqlCommand(commandText1, connection1);
                returnValue = command1.ExecuteNonQuery();
                writer.WriteLine("   command1: {0}", returnValue);

                //      ,  ,  
                //  command1  .  
                //    using  connection2   connection1, 
                //         connection2 
                //      .   
                using (SqlConnection connection2 = new SqlConnection(connectString2))
                {
                    //       
                    //   connection2 .
                    connection2.Open();

                    //      .
                    returnValue = 0;
                    SqlCommand command2 = new SqlCommand(commandText2, connection2);
                    returnValue = command2.ExecuteNonQuery();
                    writer.WriteLine("    command2: {0}", returnValue);
                }
            } 
            scope.Complete();
        }
    }
    catch (TransactionAbortedException ex)
    {
        writer.WriteLine("   : {0}", ex.Message);
    }

    Console.WriteLine(writer.ToString());

    return returnValue;
}

using (var context = new BloggingContext())
{
    using (var transaction = context.Database.BeginTransaction())
    {
        try
        {
            context.Blogs.Add(new Blog { Url = "http://blogs.msdn.com/dotnet" });
            context.SaveChanges();

            context.Blogs.Add(new Blog { Url = "http://blogs.msdn.com/visualstudio" });
            context.SaveChanges();

            var blogs = context.Blogs
                .OrderBy(b => b.Url)
                .ToList();

           transaction.Commit();
        }
        catch (Exception)
        {
             
        }
    }
}

• Atomizität
• Kohärenz
• Isolation
• Langlebigkeit