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Observe that the procedure got a plan that was reused eight times, but in this case the procedure is nothing but a shell for the dynamic SQL batch . The dynamic SQL batch got four parameterized plans one for each unique string that was executed; in other words, one for each unique combination of parameters . And as you can see, each such plan was used twice . Each plan is different and is optimal for the given inputs . Multiple invocations with the same argument list will efficiently reuse previously cached parameterized execution plans . When you re done, run the following code for cleanup:

IF IF IF IF IF IF /* IF OBJECT_ID('dbo.GetOrders', 'P') IS NOT NULL DROP PROC dbo.GetOrders; OBJECT_ID('dbo.Orders', 'U') IS NOT NULL DROP TABLE dbo.Orders; OBJECT_ID('dbo.fn_GetOrders', 'IF') IS NOT NULL DROP FUNCTION dbo.fn_GetOrders; OBJECT_ID('dbo.GetOrders0', 'P') IS NOT NULL DROP PROC dbo.GetOrders0; OBJECT_ID('dbo.GetOrders1', 'P') IS NOT NULL DROP PROC dbo.GetOrders1; OBJECT_ID('dbo.GetOrders2', 'P') IS NOT NULL DROP PROC dbo.GetOrders2; ... other procedures ... */ OBJECT_ID('dbo.GetOrders15', 'P') IS NOT NULL DROP PROC dbo.GetOrders15;

(Application State)

Pivot queries rotate data from a state of rows to columns, and unpivot queries rotate data from a state of columns to rows . I covered pivoting and unpivoting techniques in T-SQL Querying . Static pivot and unpivot queries cannot handle an unknown number of elements that must be rotated . I ll show you how to deal with an unknown number of elements by using dynamic SQL .

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In my examples, I ll use the Sales .Orders table from the InsideTSQL2008 database . The following static PIVOT query returns total freight values by shipper and shipping country (for brevity I listed only three of the existing countries):

USE InsideTSQL2008; WITH PivotInput AS ( SELECT shipperid, shipcountry, freight FROM Sales.Orders )

Many J2EE presentation layers employ the Model-View-Controller (MVC) pattern because of the common distributed application requirement of serving many types of users with different access rights and functional needs from a single user interface. As such, the MVC pattern has been mapped onto the J2EE web components in various ways, which we will characterize generally here. A servlet most often acts as the controller component for the application, although a JSP page can be used in some cases. This controller (often referred to as a front controller) performs general functionality, such as access control and request logging. It may then employ one or more helper components to assist in request-specific processing. These can be virtually any type of Java class, but are often JDBC- or EJB-aware components that integrate with other tiers of the application. Once request processing has been completed, the request and response data are forwarded to the view component. This is usually a JSP. The view component in turn uses helpers to assist in rendering the response data in an appropriate format. These helper classes are usually custom tags and JavaBeans. A full implementation of the MVC pattern in J2EE is depicted in figure A.3. The examples in chapter 5 use this pattern, but substitute XML technologies for certain J2EE components to make the solution even more robust. The case study in chapter 6 uses the MVC pattern with an XSLT servlet filter as the view component.

SELECT * FROM PivotInput PIVOT(SUM(freight) FOR shipcountry IN ([Argentina],[Austria],[Belgium]/* other countries */)) AS P;

This generates the following output:

shipperid ---------3 1 2 Argentina ---------55.54 131.97 411.07 Austria -------2107.10 2218.57 3065.83 Belgium -------279.73 269.00 731.41

When using a static query, you have to know in advance which items you want to rotate . Suppose that you need to write a solution that handles all shipping countries that exist in the table . The list of distinct countries may change because of changes in the Orders table . Therefore, you need to construct the query string dynamically by querying the distinct shipping countries that appear in the data and use dynamic SQL to execute the batch of code you constructed, like so:

Controller (Servlet)

In the MSN Messenger window, double-click the name of an online contact with whom you want to start a conversation. In the Conversation window, type Hello!, and then click Send.

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