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This chapter gave you a whirlwind tour of data in ASP.NET and showed how your web applications can be used to access data. You looked at ADO.NET and how it works, as well as how to download and install SQL Server 2005 Express. Next, you started writing ADO.NET code to access and read from the database. Then, you wrapped up with a tutorial on how to use the Visual Studio designers and tools to create connections to the database, and bind the GridView and DataList controls to present your data, which resulted in a pretty decent web-based data display application, complete with styling, selection, and pagination without writing a single line of code. You ve barely touched the surface of what is possible with ADO.NET in the .NET Framework, but working through this chapter hopefully has given you a taste of what is possible with this powerful and flexible framework! In the next chapter, you ll take a look at how ASP.NET can be used to deliver web services. These are units of business logic that can be accessed over the network or Internet using standard XML-based messages, and are the foundation of the principles of Software as a Service (SAAS).

<fragment name="col1" type="column"> <fragment name="p1" type="portlet"> <property name="portlet" value="first.firstportlet"/> </fragment> </fragment> </fragment> </fragment> </portal>

MySpaceBook tom = new MySpaceBook( ); tom.Poke("Judith"); tom.Add("Judith","Poor you"); tom.Add("Off to see the Lion King tonight"); } } /* Output Let's register you for SpaceBook All SpaceBook names must be unique Type in a user name: Judith Type in a password: haha Thanks for registering with SpaceBook Welcome Judith. Please type in your password: haha Logged into SpaceBook ======== Judith's SpaceBook ========= Hello world ================================== ======== Judith's SpaceBook ========= Hello world Today I worked 18 hours ================================== Let's register you for SpaceBook All SpaceBook names must be unique Type in a user name: Tom Type in a password: yey Thanks for registering with SpaceBook Welcome Tom. Please type in your password: yey Logged into SpaceBook ======== Judith's SpaceBook ========= Hello world Today I worked 18 hours Tom poked you eTom said: Poor you ================================== ======== Tom's SpaceBook ========= Off to see the Lion King tonight ================================== */

n 4, you looked at an application that queried data from a database and presented the results as HTML to the browser. This is considered a tightly coupled application, where the logic for the UI and the logic for the database are part of the same application module. Consider a case in which a third party would like to use your information and integrate it in their application with their branding and styling delivering HTML wouldn t be sufficient. With requirements like this in mind, XML (Extensible Markup Language) has grown in popularity. It is a way of representing data in a machinereadable format. Here s an example of a simple XML document:

Running Pluto after you deploy the portlets is simple. Just start up Tomcat, and go to the /pluto/portal path for your Tomcat installation (usually http:// localhost:8080/pluto/portal). Select the link that says first , and your first portlet should be up and running!

Notice that in this program there is no need for the ISubject interface. SpaceBook and MySpaceBook reside within the SpaceBookSystem and handle interaction through aggregation (MySpaceBook has a reference to a SpaceBook object) and accessibility modifiers, as discussed earlier.

<recordset> <record id="1"> <address>Street Address</address> <zip>11801</zip> </record> <record id="2"> <address>Street Address</address> <zip>11811</zip> </record> </recordset>

Before we move on to our next example, there are several classes in the portlet API we should cover. The GenericPortlet class is a useful abstract base class we can use for all of our portlets to provide default portlet functionality. The portlet uses the PortletRequest interface and its two subclasses, ActionRequest and RenderRequest, to retrieve information about the end user s request to the portlet, portlet configuration, and the portal s settings. The portlet uses PortletResponse, and its corresponding subclasses, ActionResponse and RenderResponse, to send output to the portal container, set portlet render parameters, and to pass information to the portal or portlet container. We are not going to cover the request and response objects in full in this chapter for more on internationalization, portal settings, and other topics, see 4. This rest of this chapter concentrates on the most commonly used aspects of the request and response objects, including the interplay between portlet actions and portlet rendering. We follow up with a more involved example of a portlet that posts information to itself, changes its own title used by the portal page, and includes images in its HTML content.

We are going to use the GenericPortlet class in the javax.portlet package as the base class for all of our portlets. GenericPortlet implements both the Portlet and the PortletConfig interfaces from the portlet API. We have already touched on the Portlet interface, but we will explain the PortletConfig interface in later chapters.

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