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There is little commonality of API between these classes. Although the DaoSupport class exists as the parent of the specific implementations, it is really there to aid in the management of the support classes life cycles and has a distinctly minimal API. The template classes don t even share a common root class or interface. Despite the API differences, there are strong similarities in the purpose of the two classes regardless of the particular framework that is being used. The DAO support class provides a base for your own DAO implementation class. Typically, it will manage a DataSource used to obtain connections to the database. It will also provide factory methods allowing a template implementation to be obtained. The purpose of the template is to wrap up as much of the boilerplate code associated with database access as possible, allowing you to focus purely on your novel application logic.

The inner part of the nested query can return a single value, a set of values, or a set of rows. The inner and outer queries can be independent to some extent, or they can be correlated.

Note When you are binding a collection of data to a DataGrid or ListBox, you may be tempted to use the List generic class. The problem with using the List class is that it does not have built-in change notifications for the collection. In order to bind a DataGrid and ListBox to dynamic data that will be updated, you should use the ObservableCollection generic class. The ObservableCollection class represents a collection of dynamic data that provides built-in notification when items in the collection are added, removed, or refreshed.

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Any moderately experienced Java developer certainly any developer experienced enough to have recognized a need for the Spring framework in their architecture will have some basic experience with JDBC. Developing software with Spring s support for JDBC does not require you to learn fundamentally new libraries, but it does provide a suite of helper classes that can substantially cut down on the boilerplate logic required in your implementation particularly the various minutiae of managing connection, statement, and result set resources and ensuring that they are released reliably and in the right order.

Inner queries that return a single value are often useful in the situation of a simple select operation to retrieve a subset of rows. Let s consider the handicaps of our members, as shown in Figure 4-5.

Now that you have the XAML and the class defined, you can wire them up. To do this, first create an event handler for the Loaded event of the page, as follows:

The DAO will honor the interface defined in Listing 4-2. However, to play nicely with Spring, the DAO needs to allow the resources it will take advantage of to be injected. To this end, and for its other benefits, my implementation extends the JdbcDaoSupport class. This implementation accepts a standard JDBC DataSource implementation as one of its properties, allowing the implementation to be configured directly from Spring. In addition to providing this convenience, JdbcDaoSupport provides a very large suite of helper methods to allow you to carry out basic JDBC operations without the usual boilerplate logic. For example, Listing 4-3 shows how a JDBC method from a non-Spring application might be implemented to obtain an instance of our entity class.

If we want to find those members with a handicap less than 16, then this can be done simply with the SQL in Listing 4-13.

public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); this.Loaded += new RoutedEventHandler(Page_Loaded); } void Page_Loaded(object sender, RoutedEventArgs e) { } } 5. When the page is loaded, you want to call GetData() from the GridData class and bind that to the DataGrid s ItemsSource property, as follows: public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); this.Loaded += new RoutedEventHandler(Page_Loaded); } void Page_Loaded(object sender, RoutedEventArgs e) { this.grid.ItemsSource = GridData.GetData(); }

public void traditionalDelete(final Long id) { Connection conn = null; PreparedStatement stat = null; try { conn = getDataSource().getConnection(); stat = conn.prepareStatement(DELETE_BY_ID); stat.setLong(1, id); stat.execute(); } catch( final SQLException e ) { } finally { try { if( stat != null) stat.close(); } catch( SQLException e ) { log.log(Level.SEVERE,"Problem closing statement",e); }

Listing 4-13. SQL Statement to Retrieve Members with Handicaps Less Than 16 SELECT * FROM Member m WHERE m.Handicap < 16

} 6.

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