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Now let s look at how you work with ADO.NET transactions programmatically. Begin by opening the AutoLotDAL Code Library project you created earlier and add a new public method named ProcessCreditRisk() to the InventoryDAL class to deal with perceived a credit risks (note that this example avoids using a parameterized query to keep the implementation simple; however, you d want use such a query for a production-level method): // A new member of the InventoryDAL class. public void ProcessCreditRisk(bool throwEx, int custID)

{ // First, look up current name based on customer ID. string fName = string.Empty; string lName = string.Empty; SqlCommand cmdSelect = new SqlCommand( string.Format("Select * from Customers where CustID = {0}", custID), sqlCn); using (SqlDataReader dr = cmdSelect.ExecuteReader()) { if(dr.HasRows) { dr.Read(); fName = (string)dr["FirstName"]; lName = (string)dr["LastName"]; } else return; } // Create command objects that represent each step of the operation. SqlCommand cmdRemove = new SqlCommand( string.Format("Delete from Customers where CustID = {0}", custID), sqlCn); SqlCommand cmdInsert = new SqlCommand(string.Format("Insert Into CreditRisks" + "(CustID, FirstName, LastName) Values" + "({0}, '{1}', '{2}')", custID, fName, lName), sqlCn); // You will get this from the connection object. SqlTransaction tx = null; try { tx = sqlCn.BeginTransaction(); // Enlist the commands into this transaction. cmdInsert.Transaction = tx; cmdRemove.Transaction = tx; // Execute the commands. cmdInsert.ExecuteNonQuery(); cmdRemove.ExecuteNonQuery(); // Simulate error. if (throwEx) { throw new Exception("Sorry! } // Commit it! tx.Commit(); } catch (Exception ex) {

The two previous functions are both called for their exit status; the calling program needs to know only whether the function succeeds or fails. Functions can also return information from a range of return codes, by setting one or more variables or by printing its results.

Because the database abstraction layer is designed to use identical function names for each database, multiple kinds of database back ends (e.g., MySQL and PostgreSQL) cannot be used simultaneously. However, see http://drupal.org/node/19522 for more information on how to allow both MySQL and PostgreSQL connections from within the same site.

Database error! Tx failed...");

Console.WriteLine(ex.Message); // Any error will roll back transaction. tx.Rollback(); } } Here, you use an incoming bool parameter to represent whether you will throw an arbitrary exception when you attempt to process the offending customer. This allows you to simulate an unforeseen circumstance that will cause the database transaction to fail. Obviously, you do this here only for illustrative purposes; a true database transaction method would not want to allow the caller to force the logic to fail on a whim! Note that you use two SqlCommand objects to represent each step in the transaction you will kick off. Once you obtain the customer s first and last name based on the incoming custID parameter, you can obtain a valid SqlTransaction object from the connection object using BeginTransaction(). Next, and most importantly, you must enlist each command object by assigning the Transaction property to the transaction object you have just obtained. If you fail to do so, the Insert/Delete logic will not be under a transactional context. After you call ExecuteNonQuery() on each command, you throw an exception if (and only if) the value of the bool parameter is true. In this case, all pending database operations are rolled back. If you do not throw an exception, both steps will be committed to the database tables once you call Commit(). Now compile your modified AutoLotDAL project to ensure you do not have any typos.