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I thought it would be fun to build a DataGrid that contains a list of starting hands in poker. If you have ever watched poker on TV, you most likely heard the players refer to things like pocket rockets and cowboys. These are simply nicknames they have given to starting hands. The DataGrid you are going to build in this example will look like Figure 5-12.

The @Id annotation marks the property as representing the primary key of the entity. Although I am using a surrogate key that will be generated automatically (see @GeneratedValue), there is nothing to prevent you from assigning one of your business attributes as the primary key field, and if you need to use multiple attributes, additional annotations are available to support this.

Listing 4-18. SQL Statement to Retrieve Members Who Have Entered a Tournament SELECT m.Lastname, m.FirstName FROM Member m WHERE EXISTS (SELECT * FROM Entry e WHERE e.MemberID = m.MemberID)

Figure 5-12. DataGrid with custom columns 1. Create a new Silverlight application called DataGridCustomColumns. Allow Visual Studio to create a Web Site project to host the application.

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The @GeneratedValue annotation is used here to indicate that the primary key (Id) attribute that it is attached to will be generated by Hibernate rather than being explicitly assigned. This reduces the burden on the developer quite considerably. Because I have not specified any further details, the generated value will be created in the default manner for the underlying database, allowing you to take advantage of database-specific features without creating a dependency on the specific database in your implementation. This usage does, however, require you to create an appropriate set of database objects to support Hibernate. In the case of HSQLDB, which I use in my example configuration, this entails the use of an identity type on the primary key column.

Because the actual values retrieved by the inner query are not important, the inner query usually has the form SELECT * FROM. Another feature of this type of query is that the inner and outer sections are usually correlated. By this we mean that the WHERE clause in the inner section refers to values in the table in the outer section. This allows us to compare values in two tables at once, and

After the project is loaded, right-click the DataGridCustomColumns project and select Add New Item. In the Add New Item dialog box, select Code File for the template, and name the class StartingHands.cs, as shown in Figure 5-13. Click the Add button to add the class to the project.

The @Column annotation can be used to specify a column name (other than the default of the attribute name), or as here can be used to indicate that additional constraints should apply to the column. I have specified that the accountName attribute is unique, and that it should not accept a null value.

I find the easiest way to visualize this is as illustrated in Figure 4-4. We write out a member s name (from the outer section) if there is a matching row in the Entry table (inner section). It is difficult to think of a sensible EXISTS query that doesn t correlate values in the inner and outer sections. Consider Listing 4-19.

Figure 5-13. Adding a new class to the Silverlight project 3. Now define the StartingHands class. The class will contain four properties: Nickname (string), Notes (string), Card1 (string), and Card2 (string). Also create a static method in the class called GetHands(), which returns an ObservableCollection of StartingHands instances. The code follows: using using using using using using using using using using System; System.Net; System.Windows; System.Windows.Controls; System.Windows.Documents; System.Windows.Ink; System.Windows.Input; System.Windows.Media; System.Windows.Media.Animation; System.Windows.Shapes;

The @ManyToMany annotation indicates the relationship between the two entities. Any UserAccount may be associated with any UserRole entity and vice versa. The fetch type of

Listing 4-19. What Does This Query Return SELECT m.Lastname, m.FirstName FROM Member m WHERE EXISTS (SELECT * FROM Entry e)

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