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Second, you ll need to insert a virtual SD card for the simulator, which you can do by configuring the simulator. I prefer the option of using a directory on the host PC filesystem, which allows me to easily view files as they are created, modified, and destroyed. In Eclipse, this option is available in the run configuration, as shown in Figure 2-7.

Right-click the design surface and select Add New Inheritance. Select Person as the base entity and Instructor as the derived entity. Right-click the design surface and select Add New Inheritance. Select Person as the base entity and Student as the derived entity. Remove the PersonId properties from both the Student and the Instructor entities. Right-click the TimeStamp property in the Person entity and view the Properties. Set the Concurrency Mode to Fixed.

(permissions) (owner) (group) (everyone) (file size) (last modified)

The resulting model is shown in Figure 14-11. The code in Listing 14-8 demonstrates what happens in the model when an out-of-band update happens.

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You will probably encounter security prompts when you run the application on the device. Dealing with these prompts is covered in depth in 9. For now, simply provide all permissions whenever the device asks for them. How do you debug when things go wrong Most developers have their favorite techniques. Remember, you can view any information that is printed to the System.out log. When the application is running on the device, never underestimate the usefulness of attaching it to your IDE for an interactive debugging session!

The ls command followed by the al option can show you the permissions, as indicated in the following example:

Figure 14-10. A database diagram with our Person table and the related Instructor and Student tables

If you would like to further enhance the behavior of this app, here are some tasks you can try for extra credit. These go above and beyond the improvements made in later chapters. Instead of using hard-coded media formats, parse the supported types provided by System.getProperty() and provide the user with a list of options. Let the user choose the file name. Check to make sure they are saving in a valid location. Suggest alternatives locations to save the file, such as internal storage. Touches like this will make an app particularly intuitive and useful.

cedge:/Users cedge$ ls -al total 16 drwxrwxrwx 8 root drwxrwxr-t 35 root -rwxrwxrwx 1 cedge -rwxrwxrwx 1 root drwxrwxrwx 16 318admin drwxrwxrwt 10 root drwxrwxrwx 38 cedge drwxrwxrwx 12 postgres

Listing 14-8. Testing the model by applying a rogue update using (var context = new EFRecipesEntities()) { var student = new Student { Name = "Joan Williams", EnrollmentDate = DateTime.Parse("1/12/2010") }; var instructor = new Instructor { Name = "Rodger Keller", HireDate = DateTime.Parse("7/14/1992") }; context.People.AddObject(student); context.People.AddObject(instructor); context.SaveChanges(); } using (var context = new EFRecipesEntities()) { // find the student and update the enrollment date var student = context.People.OfType<Student>() .First(s => s.Name == "Joan Williams"); Console.WriteLine("Updating {0}'s enrollment date", student.Name); // out-of-band update occurs Console.WriteLine("[Apply rogue update]"); context.ExecuteStoreCommand(@"update chapter14.person set name = 'Joan Smith' where personId = (select personId from chapter14.person where name = 'Joan Williams')"); // change the enrollment date student.EnrollmentDate = DateTime.Parse("5/2/2010"); try { context.SaveChanges(); } catch (OptimisticConcurrencyException ex) { Console.WriteLine("Exception: {0}", ex.Message); } } The following is the output of the code in Listing 14-8: Updating Joan Williams's enrollment date [Apply rogue update] Exception: Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted since entities were loaded. Refresh ObjectStateManager entries.

Congratulations! You have taken a giant step forward in mastering BlackBerry programming. As you have seen, the media capture APIs offered by RIM are quite powerful, providing control over the hardware capabilities of recent devices. You must consider your target market and decide what devices to support, and then check what media capture options are provided on that target. You can use MMAPI to embed media capture functions into your own application, giving you a high level of control over the user experience. Alternately, you can use RIM s Invoke API to pass off control to a native application, and then observe the results on your own. Media capture can be a compelling application by itself; it s no coincidence that new RIM phones come pre-loaded with a camera app. The most exciting apps, though, are those that use capture to obtain data and then do interesting things with it. In 3, we ll start looking at ways to display the media you have captured.

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