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PlayerStorage: At this point, it becomes obvious that the sample database design is (deliberately) flawed and that the Storage Type entries should really be in their own table This would mean you could bind the available Storage Types to a list Web control and keep control of the Storage Types for the Players But since the types are in the Player table, we re allowing users to enter any Storage Type that they want This is a good example of one of the repercussions of bad database design The list of Manufacturers is populated using a simple query to return just the ManufacturerID and ManufacturerName columns from the Manufacturer table You saw how to do this in 6 You could also have used a SqlDataSource to populate the DropDownList.

Note that Android will still destroy and re-create your activity, even if you have the orientation set to a specific value as shown here. If you wish to avoid that, you will also need to set android:configChanges in the manifest, as described earlier in this chapter.

Once the Web controls are set up as required, the user can enter the details of the new Player and click the Insert Player button to save the Player to the database Here, you see the first problem with the page..

Let s look at each of these files in turn Starting at the top you ll see the DB_CONFIG file This is the configuration file for the repository s Berkeley DB environment You might need to edit this file to change some of the parameters used by Berkeley DB (eg, large repositories might need to increase the number of locks available to Berkeley DB) We discuss this file and how you can make changes to it later in the section Berkeley DB Tuning Next, there are five files named __db001 through __db005 These are internal Berkeley DB bookkeeping databases, and you shouldn t need to concern yourself with them They re managed entirely by Berkeley DB itself Now you ll see a number of Berkeley DB database files that are used by Subversion directly.

All of the scenarios presented in this chapter assume that you rotate the screen by opening the keyboard on the device (or by pressing Ctrl+F12 in the emulator). Certainly, this is the norm for Android applications. However, we haven t covered the iPhone scenario. You may have seen one (or several) commercials for the iPhone, showing how the screen rotates just by turning the device. Some Android devices, such as the HTC Magic, will behave the same way. With other devices, though, you do not get this behavior; instead, the screen rotates based on whether the keyboard is open or closed. However, even for those devices, it is easy for you to change this behavior, so your screen will rotate based on the position of the phone. Just add android:screenOrientation = "sensor" to your AndroidManifest.xml file (from the Rotation/RotationFive sample project):

Rerun the Web site and enter a new Player without a name, cost, or storage type. Now save the Player. Instead of the Player being saved, an error has been trapped and an error message displayed, as shown in Figure 8-4. Entering invalid data and trying to save it causes a SqlException to be raised and handled by the catch clause of your data-access code. If you add a breakpoint to the code within the catch clause, you ll see that the exception is thrown because you re trying to convert an empty string (an nvarchar) to a numeric value, and it s not a valid cast. Figure 8-5 shows this information. A multitude of different errors can arise if you don t validate entries made by the user when inserting and updating data to the database. We ll look at validating the user s input in the Validating Data section later in this chapter, and you ll update this example so that invalid data can t make its way to the database. For now, you must enter values in all of the columns.