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There is no persistent connection between a web server and a web browser client In order for a web server to scale to hundreds of thousands of connections per day, there can t be a persistent connection No server could handle this Also, the Internet is built to withstand breaks in communication lines If a line goes down or a router goes bad, the connection can be rerouted via another path The Internet is error-resistant and self-healing to an extent There is also so much traffic over the Net that holding a connection open between two computers would take up too much precious bandwidth The Internet s statelessness allows you to surf to a site and then go have dinner with no harm done and no bandwidth taken.

An entity may declare named JPQL statements inside @NamedQuery annotations to define reusable queries. An @NamedQuery consists simply of a name and a queryString containing the JPQL text. @NamedQuery names must be unique across the persistence unit.

Finishing-Up the Menus on Your Site With the pages in place, you re now ready to finalize the menus on your site. Revisit the navigational structure you defined in Phase I, task F to ensure that you ve addressed all of the navigational requirements for your new site. For a description of how to create menus visit 5.

@Entity @NamedQueries({ @NamedQuery(name="findAllInventory", queryString="select object(o) from Inventory o"), @NamedQuery(name="findInventoryByYear", queryString="select object(o) from Inventory o where o.year=:year"), @NamedQuery(name="findInventoryByRegion", queryString="select object(o) from Inventory o where o.region= 1 ") }) public class Inventory implements Serializable { . . . }

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But how does a site remember you How are you able to shop online and have the cart constantly updated This is all an illusion and a great deal of programming There are ways to achieve the personalized experience you know from modern-day web sites I am sure you have shopped online, used a shopping cart, and so on You ve probably also come back to some of these sites and they remember you Cool, huh The most common way to simulate state is though a session ID Once you hit a web server and request a page, the server sends the page with a session ID to the browser Each time you make another call to the web server, the browser sends this session ID back to the server with your request This session ID is used to track you and what you are doing at the moment.

Queries may take bind parameters, either as named parameters or indexed parameters. To invoke the queries from the previous section, client code, such as a session bean, might issue the following calls:

Finalizing the Configuration At this point, the site should be configured and ready to go. In this phase, make sure that you have created all of the user roles, have assigned the appropriate permissions to those roles, and you have configured how users accounts will be created. Visit 3 for a description of how to define roles and assign permissions.

It is also used as a security token to allow you to see some pages and not others, depending upon your login Session IDs are often fleeting For example, with some sites, when you log on and get a session ID, the web server starts a countdown timer If you do not get back to the site within a certain timeout period, the session ID expires and the web server logs you out automatically You see this a lot with e-commerce sites..

@Stateless public class InventoryManagerBean implements InventoryManager, InventoryManagerLocal { . . . /** <code>select object(o) from Inventory o</code> */ public List<Inventory> findAllInventory() { return em.createNamedQuery("findAllInventory").getResultList(); } /** <code>select object(o) from Inventory o where o.year=:year</code> */ public List<Inventory> findInventoryByYear(Object year) { return em.createNamedQuery("findInventoryByYear").setParameter("year", year).getResultList(); } /** <code>select object(o) from Inventory o where o.region= 1 </code> */ public List<Inventory> findInventoryByRegion(Object p1) { return em.createNamedQuery("findInventoryByRegion").setParameter(0, p1).getResultList(); } . . . }

Note that the findInventoryByYear query takes a named parameter, :year, whereas findInventoryByRegion uses an indexed parameter, 1. These approaches are equivalent, but require different setParameter() calls when binding the parameters prior to query execution time, as shown in the previous sample code.

Note You should note that in traditional web site development, state management is quite the programming task. However, by using ASP.NET, you are covered. Microsoft takes all the state management stuff out of the programmer s hands and manages it automatically for you. There are still ways, however, to manage state yourself if needed.

Creating Content Now that we have the site configured, content types created, views defined, panels created, and user roles and permissions defined its the time to create content on your site.

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