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In this chapter, I build the same DAO implementation upon two different persistence APIs. The first of these is JDBC, the standard database connectivity API in JSE and Java EE. In practice, almost all developers have at least a passing familiarity with the JDBC API. My second DAO implementation is based on the Hibernate ORM framework. I have chosen to use Hibernate because it is a popular and effective tool, because Spring provides comprehensive support for it, and because it is the ORM tool that I am most familiar with. Unfortunately, Hibernate (along with the other ORM tools) is too complicated to explain in detail in this chapter. I am therefore forced to assume that you have some familiarity with Hibernate and to restrict my explanations to the limited parts of it that I happen to use in my examples. Nonetheless, if you are not familiar with Hibernate, I would recommend that you skim through the Hibernate section later in this chapter to see what features you are missing. This is especially true if you are familiar with another ORM tool, as many of the techniques applied to using the Hibernate framework within Spring will be analogous to those required to use other ORM frameworks. Speaking of which, Spring offers support for the following APIs and frameworks: JDBC Java Persistence API (JPA) Java Data Objects (JDO)

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Listing 4-4. Finding the IDs of All Open Tournaments SELECT t.TourID FROM Tournament t WHERE t.TourType = 'Open'

VerticalAlignment="Center" Margin="5" Grid.Row="3" /> <TextBox Text="{Binding Title, Mode=TwoWay}" Height="24" Margin="5" Grid.Column="1" Grid.Row="2" /> <TextBox Text="{Binding ISBN, Mode=TwoWay}" Height="24" Margin="5" Grid.Column="1" Grid.Row="3" /> 11. Rebuild and run your application. Update any of the fields, and leave the focus on the control. You ll see that the two-way binding is triggered, and the corresponding field is also updated, as shown in Figure 5-5.

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Hibernate Common Client Interface (CCI) iBATIS SQL Maps Oracle TopLink You may not be familiar with the relatively new JPA and JDO specifications, however. These are standard APIs, rather than specific frameworks. Indeed, Hibernate can be used as a JPA implementation, and there are a number of JDO implementations such as Java Persistent Objects (JPOX) and Orient. As with JDBC, in principle a cleanly written JPA or JDO application may be ported to a completely different implementation without affecting the application s behavior.

We can replace the list of explicit values (36, 38, 40) in Listing 4-2 with the SQL statement (Listing 4-4) that will retrieve the current values for Open tournaments, as shown in Listing 4-5. I ve indented the nested part of the query (sometimes called a subquery) so you can see it more clearly.

Figure 5-5. Two-way binding in action Congratulations! You have just created a Silverlight application that allows for two-way data binding. We will now move on to look at data binding lists of data to the two list controls provided in Silverlight: DataGrid and ListBox.

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2 covered the architecture of our example program, and in this section I will quickly review those parts of it that are directly pertinent to this chapter. Figure 4-1 shows the basic relationship between the service layer, the DAO layer, and the underlying data store (typically a relational database).

Listing 4-5. A Nested Query to Find All Entries in Open Tournaments SELECT e.MemberID FROM Entry e WHERE e.TourID IN (SELECT t.TourID FROM Tournament t WHERE t.TourType = 'Open')

In addition to binding to data, elements can be bound directly to other elements, which can significantly improve the readability and efficiency of your code. The syntax for binding to an element is very similar to binding to a data item, the only difference is that in the binding an ElementName is specified, which is very much like setting the ItemsSource to the Element. As an example, if you wanted to bind the IsEnabled property of a control to a checkbox s IsChecked property. Assuming the checkbox is named EnableButton, the binding syntax would be the following. IsEnabled="{Binding IsChecked, Mode=OneWay, ElementName=EnableButton}" Notice that the binding is the same as it would be when binding to a data source, except that we have added the ElementName=EnableButton. Let s try this out in an exercise.

You can understand a nested query by reading it from the inside out. The inside SELECT statement retrieves the set of required tournament IDs from the Tournament table, and then the outside SELECT finds us all the entries from the Entry table for tournaments IN that set. To work correctly with the IN keyword, the nested part of the query must return a list of single values.

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