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Using the Data Access Block for Transaction Management
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Invariably, work must be done transactionally. You have many ways to do many types of transactions. We limit our discussion here to what you can accomplish with the Data Access Application Block, which is a transaction on a single connection to a single data store. The block leverages the transaction capabilities built into the Managed Providers. The transaction model in the block is very simple. Many of the ExecuteXYZ methods you ve already examined have a different overloaded method footprint that accepts an instance of an IDBTransaction instance. When this is present, the work is done in a transaction. This interface exposes the Commit and Rollback methods, which determine the fate of the work that s been done in the transaction. Transactions are created by another factory method of the Database object. Let s have a look. Here you ll increase royalty paid to authors from the pubs database by 10 percent (a very fine idea indeed). First you ll update the royalty schedule. You ll then need to cascade this update to the titles table, where royalty (in a gross denormalization of the pubs schema) is carried as well. If this cascade update fails, you ll need to roll back the initial update of the royalty amounts. private void UpdateRoyalties() { Database db = DatabaseFactory.CreateDatabase(); IDbConnection cn = db.GetConnection(); string sql1 = "update roysched set royalty = royalty * 1.1"; string sql2 = "update titles set titles.royalty = roysched.royalty " + "FROM roysched INNER JOIN " + "titles ON roysched.title_id = titles.title_id"; DBCommandWrapper cwRoyal = db.GetSqlStringCommandWrapper(sql1); DBCommandWrapper cwTitle = db.GetSqlStringCommandWrapper(sql2);
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CHAPTER 11 DATA ACCESS LAYER SERVICES
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IDbTransaction xaction = null; try { cn.Open(); xaction = cn.BeginTransaction(); db.ExecuteNonQuery(cwRoyal, xaction); db.ExecuteNonQuery(cwTitle, xaction); xaction.Commit(); } catch { if (xaction != null) xaction.Rollback(); } finally { cn.Close(); } } As you can see from the code, the Managed Provider transaction model has an extremely thin wrapper provided by the block. The preceding example takes control of the connection lifetime from the Database object. This works much the same way the DataAdapter.Fill method does. If the transaction is open when the Execute method is called, the Database object will use it and leave it open; otherwise, it opens, executes, and closes the connection. This method of transaction management will work only when all work is being done on a single connection. For transactions that span databases or data providers, Microsoft Distributed Transaction Coordinator (MSDTC) must be enrolled via COM+. For more information on transactions, see 7 for a discussion of distributed transactions, and 12 for an examination of the in-memory transaction model available in the .NET Framework 2.0 that automatically enrolls the resource managers needed as the scope of a transaction increases.
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A Developer s Survey of SQL Server 2005
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Traditionally, an ASP .NET developer s concern regarding the application architecture ends at the database. Sure, you may need to decide between using stored procedures or queries, or you may need to work with the data administrator to define the data schemas, but the brunt of the design and the implementation is normally passed to those who live and breathe tables, views, stored procedures, triggers, and Transact-SQL (T-SQL). With the introduction of SQL Server 2005, however, come several new features that blur the sharp line between application and database concerns. Most notably, SQL Server 2005 provides a feature called Common Language Runtime (CLR) integration, which allows managed code to execute within the SQL Server 2005 process and interact directly with the data. Other new features of particular interest to application developers include Service Broker and XML as a native type. Although a detailed drill down of each of the features is beyond the scope of this book, this section provides an overview of each with the information you need to correctly position and leverage them in your architecture.
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