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Our application is centered around the entity classes that represent the data that we will be manipulating. The database access logic to ensure that these entities are correctly represented in the database is implemented within DAO classes. These hide the specific database access mechanism from the service layer above it. We should be able to swap out one DAO implementation (for example, a Hibernate-based DAO) for any other (for example, a plain JDBC-based one) with no changes to the implementation of the service layer. In fact, the only additional changes necessary should be in the configuration of the application context to ensure that the alternative DAO is set up and injected into the appropriate service classes. Figure 4-2 shows the entities that our DAO classes will service. They are the UserAccount and UserRole classes representing user authorizations in the application.

Note Prior to Silverlight 4, in order for an element to support element binding it had to derive from the FrameworkElement class. This unfortunately left out a number of objects that would ideally support element binding. In Silverlight 4, any object that derives from the DependencyObject now supports element binding. This opens up many new binding opportunities in Silverlight directly through XAML, such as supporting transformations.

Have another look at the tables in Figure 4-1. How else might we have retrieved entries for Open tournaments We did this in the previous chapter using a join. We can join the two tables Entry and Tournament on their common fields TourID. Then select just those rows that are for Open tournaments and retrieve (or project) the MemberID column. The SQL statement is in Listing 4-6.

The basic implementation of the UserAccount bean is shown in Listing 4-1.

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To help explain element to element binding in Silverlight, let s build a very simple application. The application will include a button and a checkbox. When the checkbox is checked, the button is enabled, when the checkbox is unchecked, the button is disabled. Let s get started. 1. Create a new Silverlight application in Visual Studio 2010. Name the project ElementBinding, and allow Visual Studio to create a Web application project to host your application. Edit the MainPage.xaml file to add a StackPanel to the root Grid. Place a ToggleButton and CheckBox named EnableButton within that StackPanel so the ToggleButton appears above the CheckBox. Add a margin of 20 on the StackPanel and 5 on the ToggleButton and CheckBox to add some spacing between the controls. The code for the page follows: <Grid x:Name="LayoutRoot" Background="White"> <StackPanel Margin="20"> <ToggleButton Margin="5" Content="Click to Toggle" /> <CheckBox x:Name="EnableButton" IsChecked="true" Margin="5" Content="Enable Button" /> </StackPanel> </Grid>

Listing 4-6. Using a Join to Find All Entries in Open Tournaments SELECT e.MemberID FROM Entry e INNER JOIN Tournament t ON e.TourID = t.TourID WHERE t.TourType = 'Open'

package com.apress.timesheets.entity; import java.util.*; import javax.persistence.*; public class UserAccount { private Long id; private String accountName; private Set<UserRole> roles = new HashSet<UserRole>(); public UserAccount() { } public UserAccount(final String accountName) { this.accountName = accountName; } public Long getId() { return id; } public void setId(final Long id) { this.id = id; } public Set<UserRole> getRoles() { return roles; }

Next, we need to bind the ToggleButton s IsEnabled property to the CheckBox s IsChecked property. We will do this with one way binding as described earlier in this chapter, and we will set the ElementName to EnableButton, which is the name we gave our CheckBox. The updated source code should now look like the following: <Grid x:Name="LayoutRoot" Background="White"> <StackPanel Margin="20"> <ToggleButton Margin="5" Content="Click to Toggle" IsEnabled="{Binding IsChecked, Mode=OneWay, ElementName=EnableButton}" /> <CheckBox x:Name="EnableButton" IsChecked="true" Margin="5" Content="Enable Button" /> </StackPanel> </Grid>

The SQL statements in Listings 4-5 and 4-6 retrieve the same information. As I ve said a number of times, there are often several different ways to write a query in SQL. The more methods you are familiar with, the more likely you will be able to find a way to express a complicated query.

public void setRoles(final Set<UserRole> roles) { this.roles = roles; } public String getAccountName() { return accountName; } public void setAccountName(String accountName) { this.accountName = accountName; } } I have chosen the UserAccount bean for our example because user account management is a common requirement for web applications. It also has the advantages of some reasonably complex associations with one other bean, the UserRole entity (implementation not shown), which make the DAO implementation sufficiently nontrivial to be used as a starting point for real-world applications. Figure 4-3 shows the tables that will be used to represent these entities in the database. There are a pair of tables corresponding to the entities themselves, and a join table representing the relationship between the user accounts and the roles. As always, all of the examples in this chapter are provided in the Source Code/Download area of the Apress website (www.apress.com).

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