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Let s now get our feet wet by examining some code for JPA. We ll pick a representatively complex domain object, Category, and see what it might look like in Java code. The Category class in listing 7.1 is a simple POJO class that is a domain object built using Java. This is a candidate for becoming an entity and being persisted to the database. As we mentioned earlier, the Category domain object may have the category name and modification date as attributes. In addition, there are a number of instance variables in the POJO class that express domain relationships instead of simple attributes of a category. The id attribute also does more than simply serving as a data holder for business logic and identifies an instance of the Category object. You ll learn about identity in the next section.

Answers to these questions and explanations of why each answer choice is correct or incorrect are located in the Answers section at the end of the book.

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Notice that the only changes were to add the runat="server" attribute to each control and the form tag. This attribute tells ASP.NET to create server control instances for each of these items. ASP.NET removes the runat attribute when rendering the page for the browser. In addition, the action attribute was removed from the form tag, because with ASP.NET you typically send the data back to the same page. You must define the ID attribute value for every tag that you add the runat="server" attribute to. The value of this ID attribute becomes the name of the control instance in your code. Visual Studio automatically adds a default ID attribute when you add an HTML control. If you decide that you no longer need to program an HTML server control in server code, you should convert it back to a plain HTML element. Each HTML server control in a page uses resources, so it is good practice to minimize the number of controls that the ASP.NET page needs to work with on the server. To do so, open the page in Source view, and then remove the runat="server" attribute from the control s tag. If the HTML element is referenced by client-side script, you should not remove its ID attribute.

I covered many aspects of joins and set operations and demonstrated new techniques that you might find handy. Remember that the old-style proprietary syntax for outer joins is not supported any more and will work only under a backward compatibility mode. At the same time, other types of joins that use the ANSI SQL:1989 syntax are fully supported, as this syntax is still part of the standardalthough when using the older syntax for inner joins, there's a risk of getting a Cartesian product when you forget to specify a WHERE clause. SQL Server 2005 introduces native operators for EXCEPT and INTERSECT. It also provides other tools that allow simple solutions for achieving EXCEPT ALL and INTERSECT ALL.

As you ve seen elsewhere in this book, C# allows you to create classes that are complex, with many different properties, which sometimes are objects of other classes as well. You ve also seen how to create collections of objects that you can manipulate in different ways. Sometimes that complexity works against you, though. Suppose you have a class that represents shipping orders for a warehouse. You could keep a ton of

Sample of Visual Basic Code Protected Sub Page_PreInit(ByVal sender As Object, ByVal e As System.EventArgs) _ Handles Me.PreInit Select Case Request.QueryString("theme") Case "Blue" Page.Theme = "BlueTheme" Exit Select Case "Pink" Page.Theme = "PinkTheme" Exit Select Case Else Page.Theme = "GreenTheme" Exit Select End Select End Sub Sample of C# Code Protected void Page_PreInit(object sender, EventArgs e) { switch (Request.QueryString["theme"]) { case "Blue": Page.Theme = "BlueTheme"; break; case "Pink": Page.Theme = "PinkTheme"; break; default: Page.Theme = "GreenTheme"; break; } }

String[] sa = new String[100]; Object[] oa = sa; // oa refers to an array of String elements oa[5] = "Jeff"; // Perf hit: CLR checks oa's element type for String; OK oa[3] = 5; // Perf hit: CLR checks oa's element type for Int32; throws // ArrayTypeMismatchException

Then you will obtain a listing of the processes on the machine that includes the PIDs, as shown in Figure 12-13.

<server> <classpath codebase="./lib" archives="jboss-cache.jar, jgroups.jar"/> <mbean code="org.jboss.cache.TreeCache" name="jboss.cache:service=TreeCache"> <depends>jboss:service=Naming</depends> <depends>jboss:service=TransactionManager</depends> <attribute name="TransactionManagerLookupClass"> org.jboss.cache.GenericTransactionManagerLookup </attribute> <attribute name="ClusterName">MyCluster</attribute> <attribute name="NodeLockingScheme">PESSIMISTIC</attribute> <attribute name="CacheMode">REPL_SYNC</attribute> <attribute name="IsolationLevel">REPEATABLE_READ</attribute> <attribute <attribute <attribute <attribute name="FetchInMemoryState">false</attribute> name="InitialStateRetrievalTimeout">20000</attribute> name="SyncReplTimeout">20000</attribute> name="LockAcquisitionTimeout">15000</attribute>

Before going any further with customization and replacement, let s briefly review the behavior of the default session state module so you can fully understand the changes you can implement. The whole session mechanism is controlled by the HTTP session module. This module hooks up three application events AcquireRequestState, ReleaseRequestState, and EndRequest. The tasks accomplished by each event handler are described in Figure 9-1. If you re content with the preceding logic, you probably don t need to replace the session module altogether. Otherwise, you should use the steps outlined next as a basis for building your own module.

5 a variation on this example,

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