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In listing 7.9, the Category object s items variable is marked by the @ManyToMany annotation and is the owning side of the bidirectional association. In contrast, the Item object s categories variable signifies the subordinate bidirectional many-tomany association. As in the case of one-to-many relationships, the @ManyToMany annotation is missing the optional attribute. This is because an empty Set or List implicitly means an optional relationship, meaning that the entity can exist even if no associations do. As a handy reference, we summarize the various elements available in the @OneToOne, @OneToMany, @ManyToOne, and @ManyToMany annotations in table 7.3.

Table 7.3 Elements available in the @OneToOne, @OneToMany, @ManyToOne, and @ManyToMany annotations Element targetEntity cascade fetch optional mappedBy @OneToOne Yes Yes Yes Yes Yes @OneToMany Yes Yes Yes No Yes @ManyToOne Yes Yes Yes Yes No @ManyToMany Yes Yes Yes No Yes

22. Add the following code into the MainPage_Loaded event handler:

Summary

Figure 7-32. Navigate to the Add content page, and select Webform. 3. After you click Save, you will need to begin adding fields that appear on the web form (see Figure 7-33); click the Add button to progress to the next screen.

If you have used EJB 2, you might be familiar with the container-managed relationship (CMR) feature of entity beans with bidirectional relationships. This feature monitored changes on either side of the relationship and updated the other side automatically. CMR is not supported in this version because entities can possibly be used outside of containers. However, mimicking this feature is not too hard using a few extra lines of code. Let us take the User-BillingInfo one-to-one relationship, for example. The code for changing the BillingInfo object for a User and making sure both sides of the relationship are still accurate would look like this:

WebClient xmlClient = new WebClient(); xmlClient.DownloadStringCompleted += new DownloadStringCompletedEventHandler(xmlClient_DownloadStringCompleted); xmlClient.DownloadStringAsync(new Uri("videodata.xml", UriKind.RelativeOrAbsolute)); After you type DownloadStringCompleted type += and press the Tab key twice to autocomplete raising the event and also automatically create the xmlClient_DownloadStringCompleted event handler. Your code should now look like this: public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); Loaded += new RoutedEventHandler(MainPage_Loaded); } void MainPage_Loaded(object sender, RoutedEventArgs e) { WebClient xmlClient = new WebClient();

user.setBilling(billing); billing.setUser(user);

7.4 Summary

xmlClient.DownloadStringCompleted += new DownloadStringCompletedEventHandler(xmlClient_DownloadStringCompleted); xmlClient.DownloadStringAsync(new Uri("videodata.xml", UriKind.RelativeOrAbsolute)); } void xmlClient_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e) { throw new NotImplementedException(); } } }

Figure 7-33. Begin adding fields that appear on the web form. 4. Fill out the form components, such as Label, Field Key, and more; the options vary depending on the field type selected in the previous step. Make sure to click submit at the bottom of the page after you re finished configuring the field. Follow steps 3 and 4 to create additional fields. You can also add e-mail responses to forms by clicking the E-mails link immediately above the list of fields, as shown in Figure 7-34. If an e-mail address field was created as a form component, it will appear in this list, allowing the form to send an e-mail to the user who submitted the form. Enter or select the correct e-mail address, and click Add.

In this chapter, we discussed basic domain modeling concepts: entities, relationships, and how to define them using JPA. The lightweight API makes creating rich, elegant, object-oriented domain models a simple matter of applying annotations or deployment descriptor settings to plain Java objects. The even greater departure from the heavyweight, framework code laden approach of EJB 2 is the fact that the new persistence API can be separated altogether from the container, as you ll see in upcoming chapters. It is interesting to note that the API doesn t directly control relationship multiplicity. In the case of one-to-one and many-to-one relationships, the optional element somewhat specifies the multiplicity of the relationship. However, in the case of one-to-many and many-to-many relationships, the API does not enforce multiplicity at all. It is instead the responsibility of the programmer to control the size of the collection holding entity references (java.util.Set objects in our examples) and therefore control multiplicity. In chapter 8 we move on to the next step in building the ActionBazaar persistence layer and show you how to map the entities and relationships we created to the database using object-relational mapping.