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Once again, the Id column is the primary key it s an int that is configured as an identity column using the Column Properties window. This table has now been given an identity key; the code in 18 will demonstrate how to support this concept within your business objects. As with the Description field in the Projects table, the LastName and FirstName columns allow Null values even though they have no business meaning. Again, this is merely to illustrate how to build business objects to deal with real-world database designs and their intrinsic flaws.

used the default username token manager or a Kerberos token, we could have used Windows roles to allow or deny access to the service. In these two models, a successfully authenticated user is mapped to a Windows account using the Principal property of the current token.

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The final three methods onCreate(), onOpen(), and onUpgrade() are designed for you to subclass to implement your desired behavior. onCreate() is triggered when the database is initially created and typically used to create tables and load data with insert statements to bring a fresh database into existence. onOpen() is triggered when the database completes opening. You would typically check things such as the read/write status of the database at this point with isReadOnly() to ensure your database is in a known state before working with it. The onUpgrade() method is called when the database needs to be upgraded from an application perspective (remember, we re not talking about SQLite versions here; we re talking about your own application version). You typically start numbering your database version at 1 and increment this to 2, then 3, and so on, as you release new versions of your application. You code your desired alter table, create table, drop table, and other statements within this method to handle graceful upgrades of the database schema for your application as it evolves.

Finally, there s the Assignments table. A many-to-many relationship exists between projects and resources a project can have a number of resources assigned to it, and a resource can be assigned to a number of projects. The way you can represent this relationally is to create a link table that contains the primary keys of both tables. In this case, it will also include information about the relationship, including the date of the assignment and the role that the resource plays in the project, as shown in Figure 3-23.

Now that you are familiar with the helper class that kick-starts the use of SQLite databases within Android, it s time to look at the core SQLiteDatabase class. A SQLiteDatabase object is conceptually easy to understand, being very similar to the underlying database object in the SQLite C API. However, the implementation of a wide range of helper methods and other tools means there s a little more under the wrapper than you might expect. More than 50 methods are available for the SQLiteDatabase class, each with its own nuances and use cases. Many of these are basic helper methods to easily complete simple tasks such as one-table select, insert, update, and delete statements. Rather than an exhaustive list, we ll cover the most important subsets of methods and allow you to explore some of the overloaded methods at your leisure. At any time you can refer to the full online Android documentation for the SQLiteDatabase class at http://developer.android.com/reference/android/database/sqlite/SQLiteDatabase.html

Figure 3-23. Design for the Assignments table The first two columns here are the primary keys from the Projects and Resources tables; when combined, they make up the primary key in the link table. Though the Assigned column is of datetime type, Null values are not allowed. This is because this value can t be empty a valid date is always required. The Role column is also a foreign key, linking back to the Roles table. The data in this table will be used to populate the ProjectResource and ResourceAssignment objects discussed earlier in the chapter. This really drives home the fact that a relational model isn t the same as an object-oriented model. The many-to-many relational design doesn t match up to the object model that represents much of the same data. The objects are designed around the normalization of behavior, while the data model is designed around normalization of data.

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