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That is it! No coding is required for this demo. Run the sample and will see that the ToggleButton is enabled, as shown in Figure 5-6.

As well as asking a question such as What are the IDs of members who have entered an Open tournament it is just as likely that we might want to know What are the IDs of members who have NOT entered an Open tournament They sound very similar, but once we start using negatives in our questions, we have to be very careful about what we really mean. In 7, we will investigate such questions using set operations, but to keep this chapter complete, I ll talk about how negatives impact the use of nested queries in particular. Listings 4-5 and 4-6 showed two SQL statements for retrieving member IDs for members who have entered an Open tournament. As a first attempt, novices will often amend these queries slightly by changing = to <> or by changing IN to NOT IN, as in Listing 4-7 and Listing 4-8.

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As you will see in 10, the unit tests for the example have been written to use identical test code (aside from setup and teardown of the DAO itself) against the three DAO implementations, making it far more likely that we will have compatible versions. The interface shown in Listing 4-2 is divided by comments into four sections: Create, Read, Update, and Delete, which form the CRUD mnemonic. These are the basic operations that most applications will need to perform on their data, so they will usually need to exist in some form. Your specific methods should be tailored to the requirements of your application.

Now uncheck the Enable Button checkbox and you will see that the ToggleButton is no longer enabled, as shown in Figure 5-7.

Listing 4-7. Using NOT IN: What Does This Query Retrieve SELECT e.MemberID FROM Entry e WHERE e.TourID NOT IN (SELECT t.TourID FROM Tournament t WHERE t.TourType = 'Open')

The data grid type of control has been around for ages and has been the primary choice for developers who need to display large amounts of data. The DataGrid control provided by Silverlight is not just a standard data grid, however. It contains a great deal of rich user functionality that, in the past, has been present only in third-party data grid components. For example, the Silverlight DataGrid handles resizing and reordering of grid columns. Figure 5-8 shows an example of a very simple DataGrid, where the columns were automatically generated. Notice how the column titled Male is a check box. The DataGrid control has built-in intelligence to automatically show Boolean data types as check box cells.

package com.apress.timesheets.dao; import java.util.List; import com.apress.timesheets.entity.UserAccount; public interface UserAccountDao { // Create methods public void create(UserAccount account); // Read methods public List<UserAccount> list(); public UserAccount read(Long id); public UserAccount read(String accountName); // Update methods public void update(UserAccount account); // Delete methods public void delete(UserAccount account); public void delete(Long id); } In fact, the You Ain t Gonna Need It (YAGNI) principle of agile programming suggests that I may already have produced a more complicated API than is strictly required for the timesheet application, although it is still useful for the purposes of my examples. In a real application, your API should be driven by the requirements and should not necessarily reflect Listing 4-2 exactly. If one of the CRUD operations is not required by your application s use cases, there is no need to implement it.

Listing 4-8. Using <>: What Does This Query Retrieve SELECT e.MemberID FROM Entry e INNER JOIN Tournament t ON e.TourID = t.TourID WHERE t.TourType <>'Open'

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