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It is possible to keep the result of a query in a new permanent table (sometimes called a snapshot), but we usually don t want to do that because it will become out of date if the underlying data changes What we usually want to do is save the instructions so that we can ask the same question another day Consider our phone list query Every so often after the membership of the club has been updated, we might want to see a new phone list Rather than having to write the query in Listing 2-7 each time, we can save the instructions in what is known as a view Listing 2-13 shows how we can create a view so we can see upto-date phone lists.

The logic of the JDBC-based DAO implementation is easy to follow for any of the individual methods, but it does have its own complexity. For example, the method used to read in an Account object populates the Roles set. This operation may be entirely redundant; if the

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Figure 3-9. The StackPanel control with horizontal orientation 2. Notice that all the buttons are touching each other, which is unattractive. You can easily space them out by using their Margin property. In addition, you can center the buttons by setting the StackPanel control s HorizontalAlignment property to Center. Other options for HorizontalAlignment include Left, Right, and Stretch (which stretches the content to the left and right). Make the following changes to adjust the buttons: <Grid x:Name="LayoutRoot" Background="White"> <StackPanel Orientation="Horizontal" HorizontalAlignment="Center"> <Button Width="100" Height="30" Content="Button 1" Margin="5"></Button> <Button Width="100" Height="30" Content="Button 2" Margin="5"></Button> <Button Width="100" Height="30" Content="Button 3" Margin="5"></Button> </StackPanel> </Grid> After you have made these changes, your buttons are spaced out nicely in the center of the application, as shown in Figure 3-10.

We have to give the view a name, which can be anything we want (PhoneList seems sensible), and then we supply the SQL statement (as in Listing 2-7) for retrieving the appropriate data..

code that consumes the materialized UserAccount object does not make use of the role information, then we have made unnecessary JDBC calls. Individually this is insignificant, but collectively the performance hit can be substantial enough to matter. In addition to performance, there are other issues of complexity. The SQL statements used to retrieve the information are somewhat redundant in their design, reflecting the similarities of the underlying tables. Hibernate alleviates these and other problems. At the expense of some leaky abstractions of the detail of JDBC-based data access, the use of Hibernate significantly reduces the overall complexity of the application logic, making your DAO implementations shorter and easier to understand.

Microsoft designed the control framework so that any object can be contained within another object. One way you can enhance your layout is by nesting a layout control within another layout control. In this example, you will nest a StackPanel control within another StackPanel control, but realize that you can nest any layout control within any other layout control to get the exact layout functionality you are seeking. 1. 2. In Visual Studio 2010, create a new Silverlight application named NestedStackPanel and allow Visual Studio to create a Web Application project to host the application. In the MainPage.xaml file, add the following items: A StackPanel control to the root Grid with its Orientation property set to Horizontal and the HorizontalAlignment property set to Center. Within that StackPanel, add two buttons with the labels Button Left and Button Right. In between the two buttons, add another StackPanel with Orientation set to Vertical and VerticalAlignment set to Center. Within that nested StackPanel, include three buttons with the labels Button Middle 1, Button Middle 2, and Button Middle 3.

Listing 2-13. Creating a View So You Can Use the Same Query Many Times CREATE VIEW PhoneList AS SELECT m.LastName, m.FirstName, m.Phone FROM Member m

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