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In SQL Server, a stored procedure can also perform a distributed transaction (one that involves multiple data sources and is typically hosted on multiple servers). By default, every transaction begins as a local transaction, but if you access a database on another server, the transaction is automatically upgraded to a distributed transaction governed by the Windows DTC (Distributed Transaction Coordinator) service.

Most ADO.NET data providers include support for database transactions. Transactions are started through the Connection object by calling the BeginTransaction() method. This method returns a provider-specific Transaction object that s used to manage the transaction. All Transaction classes implement the IDbTransaction interface. Examples include SqlTransaction, OleDbTransaction, OracleTransaction, and so on. The Transaction class provides two key methods: Commit(): This method identifies that the transaction is complete and that the pending changes should be stored permanently in the data source. Rollback(): This method indicates that a transaction was unsuccessful. Pending changes are discarded, and the database state remains unchanged. Typically, you use Commit() at the end of your operation. However, if any exception is thrown along the way, you should call Rollback(). Here s an example that inserts two records into the Employees table: string connectionString = WebConfigurationManager.ConnectionStrings["Northwind"].ConnectionString; SqlConnection con = new SqlConnection(connectionString); SqlCommand cmd1 = new SqlCommand( "INSERT INTO Employees (LastName, FirstName) VALUES ('Joe','Tester')"); SqlCommand cmd2 = new SqlCommand( "INSERT INTO Employees (LastName, FirstName) VALUES ('Harry','Sullivan')"); SqlTransaction tran = null; try { // Open the connection and create the transaction. con.Open(); tran = con.BeginTransaction();

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// Enlist two commands in the transaction. cmd1.Transaction = tran; cmd2.Transaction = tran; // Execute both commands. cmd1.ExecuteNonQuery(); cmd2.ExecuteNonQuery(); // Commit the transaction. tran.Commit(); } catch { // In the case of error, roll back the transaction. tran.Rollback(); } finally { con.Close(); } Note that it s not enough to create and commit a transaction. You also need to explicitly enlist each Command object to be part of the transaction by setting the Command.Transaction property to the Transaction object. If you try to execute a command that isn t a part of the current transaction while the transaction is underway, you ll receive an error. However, in the future this object model might allow providers to support more than one simultaneous transaction on the same connection.

Instead of using separate command objects, you could also execute the same object twice and just modify its CommandText property in between (if it s a dynamic SQL statement) or the value of its parameters (if it s a parameterized command). For example, if your command inserts a new record, you could use this approach to insert two records in the same transaction.

An important aspect of a large application is knowing when certain things happen in other parts of the application. Even better is the ability to do something the instant that event happens. For this purpose, Django includes a signal dispatcher that allows code to broadcast the occurrence of an event, while providing a method for other code to listen for those broadcasts and react accordingly, the instant the event occurs. It identifies the type of event being broadcast by allowing code to define unique signals to dispatch. This concept of dispatching and the code that enables it isn't unique to Django, but its implementation is customized for the needs of a Web application. This implementation is located at , though it s designed to be used through the simple object, available at . Django uses signals in a variety of places, many of which have been documented elsewhere in this book, in the areas where they re used. The following sections discuss in more generality how signals and dispatching work, and how to register listeners for particular events.

To test the rollback features of a transaction, you can insert the following line just before the Commit() method is called in the previous example: throw new ApplicationException(); This raises an exception, which will trigger a rollback and ensure that neither record is committed to the database. Although an ADO.NET transaction revolves around the Connection and Transaction objects, the underlying commands aren t different from a stored procedure transaction. For example, when you call BeginTransaction() with the SQL Server provider, it sends a BEGIN TRANSACTION command to the database.

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