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Persistence services make up a group of Java Persistence API (JPA) entities that are mapped to the wine store database schema using annotations. This group of entities is used as a persistence unit that is injected into other components and services to perform queries and CRUD operations on individual entities or groups of entities. Figure 7-4 illustrates the entities, the inheritance model, and the relationships between them. The Customer entity is inherited by the Individual and Distributor entities. InventoryItem, CartItem, and OrderItem entities inherit the WineItem entity. The BusinessContact entity is inherited by the Supplier entity. The wine store persistence unit also contains different types of relationships between these entities (including one-toone, one-to-many, and many-to-many), which will be accessed from the application code. The mappings used in these entities were covered in s 3 and 4. We will focus on the code that is used in other components of this application to integrate this persistence unit.

One of the problems these days with designing websites is that you want to attract people to your site and at the same time you have to make the site useful. This often leads to complex page layouts that sometimes include options to reduce the complexity. You are probably familiar with sites that have an option to make the page printable, for instance. This option usually takes the border away and may apply some additional formatting changes. Seam has a built-in way to change page formatting automatically. This works like internationalization, and the options are referred to as themes. The themes work by defining certain attributes for the pages. Because the idea is to change the look and feel of the page, the two most common parts to change are the template and the cascading style sheet (CSS).

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Figure 9-1. Click the New Post button. Then, enter a title for your post, and click the little square Insert Image icon, as shown in Figure 9-2, which is to the right of the ABC/checkmark icon.

allow the client application to either query the customer based on their e-mail address or perform CRUD operations on the Customer entity in the persistence unit using an injected EntityManager via the @PersistenceContext annotation. Listing 7-1 shows the findCustomerByEmail method in CustomerFacadeBean. This method calls the named query findCustomerByEmail defined in the Individual entity of the wine store persistence unit using the createNamedQuery() method in the EntityManager.

Figure 9-2. Insert Image icon This starts the process of uploading the image. You first click the Browse button and locate the image you want (see Figure 9-3).

Creating a theme works on the same principle as creating language bundles, except this time you will create property files that include your theme-specific information. Our example will include two items: the CSS and a template file. In reality, you could customize the theme as much as you want. Listing 8-10 shows an example of our default theme.

createNamedQuery() is a method in the javax.persistence.EntityManager interface. This method creates an instance of javax.persistence.Query for executing a named query specified in JPQL (Java Persistence Query Language) or native SQL.

public Individual findCustomerByEmail(Object email) { return (Individual)em.createNamedQuery("findCustomerByEmail").setParameter("email", email).getSingleResult(); }

Figure 9-3. Click Browse, and locate an image. Starting at the top of Figure 9-3: After you click the Browse button and locate the desired picture, you can click the Add another image link or move on. In the layout section, I prefer the None option. The other options place the image on the left (with text on the right of the image), center, or right, and so on. For the image size, I like going with Large. You need to click the I accept the Terms of Service check box. Then, you can click the Upload Image button.

In our default theme, we define two properties: the location of the style sheet and the location of the default template, which in this case is in the root web directory. As with internationalization, these bundles need to be stored in the WEB-INF/classes directory and can be stored at different package levels. Of course, for our examples, we will assume that they are stored at the root level. Also as with internationalization, we will set the properties for these in the components.xml file. They will be stored in the Seam session-scoped object ThemeSelector.

Listing 7-2 shows the complete code for CustomerFacadeBean, which has the business methods to perform CRUD operations using the EntityManager. This bean class has two business interfaces, CustomerFacade and CustomerFacadeLocal, which support remote and local client access. Listings 7-3 and 7-4 show the local and remote interfaces for CustomerFacadeBean.

You get a confirmation message after the image is uploaded, and then you can click the Done button (see Figure 9-4).

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