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With this completed, your class is set up to notify bound clients of changes to the Title and ISBN properties. But you still need to take one more step. By default, when you bind a source to a target, the BindingMode is set to OneWay binding, which means that the source will send the data to the target, but the target will not send data changes back to the source. In order to get the target to update the source, you need to implement two-way (TwoWay) binding.

In this chapter, you have looked at the core classes of the Spring framework and the configuration files associated with the creation of bean factories from which your configured beans are obtained. In the next chapter, you will look at the facilities that Spring provides for accessing databases, the foundation blocks of any enterprise application.

Listing 4-3. Using NOT IN Keyword SELECT e.MemberID FROM Entry e WHERE e.TourID NOT IN (36, 38, 40)

Note Earlier, I mentioned that there are three options for BindingMode. The third option is OneTime binding. In this mode, the values are sent to the target control property when the object is set to the DataContext. However, the values of the target property are not updated when the source value changes.

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n this chapter, you will look at Spring s support for databases. Spring provides libraries to help you create ordinary JDBC-based data access, but it also provides some support for several Object Relational Mapping (ORM) tools. The examples in this chapter are both based around the data access object (DAO) pattern. This is not the only way in which you can use Spring, but is probably the commonest approach in general use at the moment.

The real usefulness of the IN keyword is that we can use another SQL statement to generate the values in the set. For example, the reason that someone may have been interested in the set of tournaments (36, 38, 40) might have been because they are the Open tournaments. Thus, we might want to generate a list of Open tournaments and feed that list into the IN clause. Let s look at a specific example of a query feeding into IN. I ve reproduced a few of the columns of the Member table along with the Entry and Tournament tables in Figure 4-1. In Listings 4-1 and 4-2, the Open tournaments were explicitly stated in the query by listing each ID. If a new Open tournament is added to the Tournament table, then the query will need to be changed to include that tournament s ID in the set. However, we can construct another query to retrieve the IDs of all the Open tournaments, as shown in Listing 4-4.

10. To change to two-way binding, add the Mode=TwoWay parameter when defining the {Binding} on a control, as follows: <TextBlock Text="Book Title" VerticalAlignment="Center" Margin="5" /> <TextBlock Text="ISBN-13" VerticalAlignment="Center" Margin="5" Grid.Row="1" /> <TextBox Text="{Binding Title, Mode=TwoWay}" Height="24" Margin="5" Grid.Column="1" /> <TextBox Text="{Binding ISBN, Mode=TwoWay}" Height="24" Margin="5" Grid.Column="1" Grid.Row="1" /> <TextBlock Text="Book Title" VerticalAlignment="Center" Margin="5" Grid.Row="2" /> <TextBlock Text="ISBN-13"

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