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The EntityManager, also introduced in EJB 3.0, is the client s gateway to entity management services offered by the EJB 3.0 persistence framework. Client sessions must obtain an EntityManager instance before interacting with persistent entity instances. The EntityManager provides support for querying, updating, refreshing, and removing existing entity instances, and registering entity classes to create new persistent objects with identity.

Figure 14-14. All users now set to active One of the options that you can set on the Account settings page is whether users receive e-mail notifications when their accounts are created. If you have that option enabled, when you enable an account the user is automatically notified via e-mail that their account is now ready for them to log in to the website.

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The EntityManager maintains a cache of instances within a transactional context called a persistence context. The persistence context allows the EntityManager to track modified, created, and removed entity instances, and to reconcile entity instances with changes that were committed by external transactions concurrent with the EntityManager s own transaction. Entity instances queried through the EntityManager may be freely passed to clients both inside and outside the EJB container. Clients may access and update the entity data as they would an ordinary Java object. To apply changes back to the persistent store, the

If you look at this list and think about it for a minute, you can see that these modules make up about 90 percent of any web site you would want to create. For instance, here are some things that a hypothetical web site would need: An account login module to keep track of users and to allow users access to different pages A user account module for people to register for your web site An announcements module to let users know what is going on at your business A contacts module to let users call or e-mail you A text/HTML module in several places to contain the content of your web site A banners module that allows you to show paid advertising A search input and results module set to allow users to search your web site Did I miss anything Probably quite a bit. You get the drift though. This is pretty much a one-stop shop for web site creation.

client calls the merge() method on the EntityManager, within a transactional scope, and the EntityManager persists the state of the entity data into the back-end store.

Summary

Since baby blue is fine with me, I will leave this class alone. You will notice from Listing 11-1 that the cell containing the content pane uses the contentpane class. You will change this to use the controlpanel class. The code is as follows:

An EntityManager instance can be acquired both from within the EJB container (Java EE) and outside it (Java SE). This offers clients the flexibility to interact with persistent entity beans in a uniform way, without regard to whether the persistence code is running inside or outside the Java EE container.

<tr> <td id="ControlPanel" runat="server" class="controlpanel" valign="top" align="center"> </td> </tr>

Listing 3-13 gives an example of a session bean acquiring an EntityManager instance through container injection.

In this chapter, I covered the basics of administering a Drupal website. I explained the key administrative tasks associated with running your new site. Depending on the complexity of your site and the features you have deployed, there may be other administrative tasks that are specific to those additional features. This list will get you started down the path to ensuring that your site is backed up, error free, and up to date. For additional Drupal administrative topics, visit the Drupal.org website. Wow, we ve covered a lot of information up to this point. You now have the knowledge necessary to build simple to complex websites on Drupal, and you now know how to administer your new site. That a lot of information to digest, and you may be wondering where to start when setting up a new site. That s the focus on the next and last chapter of the book, helping you navigate through the process of creating a successful Drupal website.

@Stateless public class CustomerManager { @PersistenceContext("03-Unit") private EntityManager em; public void createCustomer() { final Customer cust = new Customer(); cust.setName("Moneybags MgGee"); em.persist(cust); } }

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