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The Price field holds the monetary value of the cost of each product in the table. Since it will be a currency value, the data type will be a smallmoney type, and the field not allow null values. At this point, you might be asking yourself, why not have a field for shipping cost and sales tax when charging sales tax for the products sold You will be dealing with these values; however, they are considered to be aggregate values, and it is a good practice to not store aggregate values within your database schema. Instead, these values will be automatically calculated.

If you are used to developing for other databases, you are also probably used to having tools to inspect and manipulate the contents of the database, beyond merely the database s API. With Android s emulator, you have two main options for this. First, the emulator is supposed to bundle in the sqlite3 console program and make it available from the adb shell command. Once you are in the emulator s shell, just execute sqlite3, providing it the path to your database file. Your database file can be found at the following location:

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Continuing along with products, the next table you ll create should be the ProductCategory table. This table will be a fairly simple table with only a few fields because this table will be what is known as a lookup table. In other words, it will give specific category names to all the products while associating them to the Products table with a unique ID. Table 8-2 shows the specifics of the ProductCategory table. Table 8-2. ProductCategory Table

There is no automatic discovery of permissions at compile time; all permission failures occur at runtime. Hence, it is important that you document the permissions required for your public APIs, including content providers, services, and activities intended for launching from other activities. Otherwise, the programmers attempting to interface with your application will have to find out the permission rules by trial and error. Furthermore, you should expect that users of your application will be prompted to confirm any permissions your application says it needs. Hence, you need to document for your users what they should expect, lest they get confused by the question posed by the phone and elect to not install or use your application.

In the following sections, I ll discuss the individual fields of the ProductCategory table. Figure 8-13 shows the fields.

Here, your.app.package is the Java package for your application (e.g., com.commonsware.android), and your-db-name is the name of your database, as supplied to createDatabase(). The sqlite3 program works, and if you are used to poking around your tables using a console interface, you are welcome to use it. If you prefer something a little friendlier, you can always copy the SQLite database off the device onto your development machine, and then use a SQLite-aware client program to putter around. Note, though, that you are working off a copy of the database; if you want your changes to go back to the device, you will need to transfer the database back over. To get the database off the device, you can use the adb pull command (or the equivalent in your IDE, or File Manager in the Dalvik Debug Monitor Service, discussed

The ProductCategoryID field is the unique identifier in the table along with being the primary key. As a result, it will have a data type of int and not allow any null values.

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