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This time the procedure identified that it was invoked from an outer transaction, and upon error rolled back only its own activity (to the savepoint) . To demonstrate a failed transaction, set XACT_ABORT ON and try again:

SET XACT_ABORT ON; BEGIN TRAN EXEC AddEmp @empid = 1, @empname = 'Emp1', @mgrid = NULL; ROLLBACK SET XACT_ABORT OFF;

You get the following output:

For example, your application may need to determine whether a session object exists for a given user and create one if necessary. If the check needs to occur on every request, encapsulating this logic in an inbound filter makes sense. Perhaps your user interface components produce XML that needs to be translated into an output document based on the user s device type and locale. This logic could be encapsulated in an outbound filter and applied to every response. In chapter 5, we do this very thing using XSLT, a document transformation technology based on XML. This same pattern is used with XSLT the chapter 6 case study. There are many other circumstances where this pattern can be useful. In general, you will use inbound filters to prepare requests for processing and outbound filters for output formatting. Other functionality, such as logging, could be implemented as either type of filter, depending on the data you wish to collect.

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Error detected. Transaction is open and uncommittable. Proc was invoked in an open tran, but tran is uncommittable. Deferring error handling to caller. Msg 50000, Level 14, State 1, Procedure AddEmp, Line 67 Violation of PRIMARY KEY constraint 'PK_Employees'. Cannot insert duplicate key in object 'dbo.Employees'.(Original error number: 2627)

This time the procedure identified a failed transaction opened by the caller, so it deferred the error handling to the caller .

In this final section about error handling, I ll demonstrate how you can trap deadlock errors and apply retry logic for them . I ll also show examples that deal with update conflicts detected when you work with the snapshot isolation level . Here as well, as in a deadlock case, you might want to retry several times before you deem the activity a goner .

Run the test code, which invokes the stored procedure four times, and observe the desired efficient plans shown in Figures 9-5 and 9-6 .

A.1.2

Run the test code again so that each procedure reuses the previously cached plan . Next, run the following code to analyze plan reuse behavior:

SELECT cacheobjtype, objtype, usecounts, sql FROM sys.syscacheobjects WHERE sql LIKE '%27702431-107C-478C-8157-6DFCECC148DD%' AND sql NOT LIKE '%sys%';

BE SURE TO have at least one online contact in your MSN Messenger contacts list, and ask that contact if he or she would mind assisting you before beginning this exercise. USE the Cat picture in the practice file folder for this topic. This practice file is located in the My Documents\Microsoft Press\Laptops and Tablet PCs with Windows XP SBS\Working\SendingFiles folder.

You get the following output, shown here in abbreviated form:

This pattern is familiar to many developers who have written applications requiring multiple user views of the same data. The concept here is that access to an application is centrally managed by a controller component, which often performs security checks and logs request activity. All client requests pass through the controller and are dispatched to a component that renders the user interface. This component is known as the view, and provides a specific user with customized access to the application and its data. Internally, the application actually has a single state (the model) from which all views are derived. This is depicted in figure A.2.

cacheobjtype -------------Compiled Plan Compiled Plan Compiled Plan Compiled Plan Compiled Plan objtype --------Prepared Prepared Prepared Proc Prepared usecounts ---------2 2 2 8 2 sql -----------------------------------... WHERE 1 = 1 AND orderdate = @dt ... WHERE 1 = 1 AND empid = @eid ... WHERE 1 = 1 AND custid = @cid CREATE PROC dbo.GetOrders... ... WHERE 1 = 1 AND orderid = @oid

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