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A number of technologies that support transactions are available for use in version 1.x of the .NET Framework. Which one you select depends on the requirements of the transactional infrastructure. Because of the resource expense and performance hit incurred by introducing a transaction into a process, you should select the cheapest technology that does the job.
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The first of these are transactions that you can create and manage from within a stored procedure. We ll examine Transact-SQL running on SQL Server, but other database vendors products expose similar functionality for whatever language is available for coding procedures (e.g., PSQL in Oracle). Building transactions right into the database stored procedures results in transaction logic that is managed by the database server, is optimized by the database engine, and runs in the same process space of the server. A stored procedure can start a transaction and call other stored procedures in the database and their work will be included in the transaction. The downside to this approach is that it tends to move business logic coding into the database layer. Transactions frequently reflect business rules, so to code the transaction within the stored procedure code naturally introduces business logic into this tier of your application. You re also limited to a single database within which to do your transactional modifications. You can overcome this in SQL Server using linked servers, but you re definitely limited to modifying SQL Server data.
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Note A linked server in SQL Server is a server that is virtualized locally. That is, a linked server acts as
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an alias for an external database, and makes the database look like it s on the local SQL Server, even though it s located on an entirely different server.
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T-SQL is an unmanaged language that lacks the eloquence and clarity of C# code. Stored procedure support for exception handling is also limited (these limitations can be overcome with SQL Server 2005, which enables you to write stored procedures using C#, see the last section of 11). You also lose the ability to dynamically compose a transaction, as whatever work is being done in the stored procedure becomes the work done in the transaction. Any attempt to overcome this will invariably result in more business logic in your database layer. You can do transactions on a single connection with ADO.NET transactions. This overcomes some of the problems using T-SQL transactions, as it moves the transaction management logic into your C# code, where structured error handling and the other niceties of managed code execution can be leveraged. It s also easier to dynamically compose transactions by calling an arbitrary set of stored procedures determined by business logic (although this still requires some design consideration and coding and is not as easy as the attribute-based system available in COM+). Here s a simple procedure doing some database work in a transaction. (See XActionIE.aspx in the Web12 project.) public static void SingleDBUpdate(Hashtable ht) { using (SqlConnection cnn = new SqlConnection(WebStatic.ConnectionString)) { string sql; cnn.Open(); SqlTransaction tx = cnn.BeginTransaction(); try
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CHAPTER 12 TRANSACTIONS
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{ foreach(string key in ht.Keys) { sql = "INSERT INTO Tuples (keyValue, dataValue) " + "VALUES ('{0}', '{1}') "; sql = string.Format(sql, key, ht[key]); SqlCommand insert = new SqlCommand(sql, cnn, tx); insert.ExecuteNonQuery(); } tx.Commit(); } catch (Exception e) { tx.Rollback(); HttpContext.Current.Response.Write(e.Message); } finally { cnn.Close(); } } } Here you re explicitly tied to a single connection. You can pass this connection around to dynamically compose the commands that make up the connection, but are still tied to a single data source. To span data sources, you must enlist the services of the DTC via COM+. (See Mover.cs in the App_Code directory of the Web12 project.) [Transaction(TransactionOption.Required)] public class Mover : ServicedComponent { [AutoComplete] public void Move() { using(SqlConnection cnnDB1 = new SqlConnection(Database1), cnnDB2 = new SqlConnection(Database2)) { SqlCommand cmdDeleteDB1 = new SqlCommand("DELETE ...", cnnDB1); SqlCommand cmdInsertDB2 = new SqlCommand("INSERT ...", cnnDB2); // ADO.NET connections automatically enlist into // the DTC transaction cnnDB1.Open(); cnnDB2.Open(); cmdDeleteDB1.ExecuteNonQuery();
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