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You don t need to use stored procedures if you want to perform database operations. You can directly send the SQL commands from an external application to SQL Server. When using stored procedures, instead of passing the SQL code you want executed, you just pass the name of the stored procedure and the values for any parameters it might have. Using stored procedures for data operations has the following advantages: Storing SQL code as a stored procedure usually results in better performance because SQL Server generates and caches the stored procedure execution plan when it s first executed. Using stored procedures allows for better maintainability of the data access and manipulation code, which is stored in a central place, and permits easier implementation of the three-tier architecture (the stored procedures forming the data tier). Security can be better controlled because SQL Server permits setting different security permissions for each individual stored procedure. SQL queries created ad hoc in C# code are more vulnerable to SQL injection attacks, which is a major security threat. Many Internet resources cover this security subject, such as the article at http://www.sitepoint.com/article/sql-injection-attacks-safe. This might be a matter of taste, but having the SQL logic separated from the C# code keeps the C# code cleaner and easier to manage; it looks better to call the name of a stored procedure than to join strings to create a SQL query to pass to the database. Your goal for this section is to write the GetDepartments stored procedure; but first, let s take a quick look at SQL.

Figure 1-10. Updated solution structure that contains three projects The added Example3 project has a single file called Class1.cs, which is a plain-vanilla source code file.

SQL (Structured Query Language) is the language used to communicate with modern Relational Database Management Systems (RDBMSs). Most database systems support a particular dialect of SQL, such as T-SQL for SQL Server and PL/SQL (Procedural Language extensions to SQL) for Oracle. Because T-SQL is a big subject when analyzed in detail, we ll briefly introduce it and cover just enough so you ll understand the code in your stored procedures.

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Figure 6-2. A more extensive inheritance tree illustrating how functionality can be enhanced In Figure 6-2, all of the cars are related in that they are the 530 line. The new model is the BMW 530xi Sports Wagon, which, from an inheritance perspective, is based on the functionality of the BMW 530xi. But here is the twist: the functionality of the 530xi Sports Wagon requires you to get accustomed to the Sports Wagon. For example, even though you press a single button to open the trunk, the Sports Wagon s trunk is slightly different from the trunk in the 530xi and 530i, and thus exposes the driver to a slightly different user interface and behavior. When you use inheritance to overload functionality, you are adding functionality that is called in the same way, but is used and behaves differently. With this form of inheritance, you don t just change behavior, you also change the user interaction. In our example, we will use inheritance to extend functionality, and not override or overload.

Tip For further SQL reference, we also recommend Beginning SQL Queries (Apress, 2008).

For the area problem, goal seek to determine the radius when the area is 17. 1. Click Tools Goal Seek. 2. In the Set Cell box, type or click cell A13. 3. In the To Value box, type 17. 4. In the By Changing Cell box, type or click cell A10. 5. Click OK, and click OK again. Answer: An area of 17 results in a radius of about 2.3.

The basic and most important SQL commands are SELECT, INSERT, UPDATE, and DELETE. Their names are self-explanatory, and they allow you to perform basic operations on the database. You can use SQL Server Management Studio Express to test these commands with your newly created Department table. Start SQL Server Management Studio Express, log in to your local SQL Server Express instance (by default, named localhost\SqlExpress), and then execute the following command, which connects you to the BalloonShop database. (To execute the command, click New Query to open a new query window, type the command you want to execute, and finally use the Execute button on the toolbar. Alternatively, choose Query Execute, or press the F5 shortcut key.) USE BalloonShop After executing this command, you should get a Command(s) completed successfully message. After you connect to the database, you re ready to test the SQL commands you re about to learn. Be aware that each SQL command has many optional arguments, and they can become more complex than those presented here. Still, to keep the presentation short and simple, you ll learn the most important and frequently used parameters, and we ll get into more details later in the book.

So far, the test code would call a data member reference, as in this line: cls.ExchangeRate = 123.45; The data member would be implemented as follows: public abstract class CurrencyTrader { public double ExchangeRate; } Exposing the data member using a public scope worked in previous chapters, but we don t really want to do this because we are exposing the internal state of the object. In object-oriented programming, exposing the internal state is a bad idea (as explained in more detail shortly).

The SELECT statement is used to query the database and retrieve selected data that match the criteria you specify. Its basic structure is SELECT <column list> FROM <table name(s)> [WHERE <restrictive condition>]

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