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Figure 24-1. Three-tier design The important detail about three-tier design is that information travels from only one level to an adjacent level. In other words, your user interface code shouldn t try to directly access the database and retrieve information. Instead, it should go through the second level and then arrive at the database. This basic organization principle can t always be adhered to, but it s a good model to follow. When you create a component it s almost always used in the second level to bridge the gap between the data and the user interface. In other words, if you want to fill a list of

product categories in a list box, your user interface code calls a component, which gets the list from the database and then returns it to your code. Your web page code is isolated from the database and if the database structure changes, you need to change one concise component instead of every page on your site.

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The straightforward solution, most widely used in such situations, consists of using LIKE in the WHERE clause of the SELECT statement. The following query returns all the products that have the word mask somewhere in their description: SELECT Name FROM Product WHERE Description LIKE '%mask%' The percent (%) wildcard is used to specify any string of zero or more characters. Placing it before and after the word to be searched for guarantees that you ll get all the products whose description contains the word mask. This technique using WHERE and LIKE was used when building the SearchCatalog stored procedure for the ASP.NET 1.0 (but not in the ASP.NET 1.1) edition of this book, and is also presented in the Product Catalog case study in The Programmer s Guide to SQL (Apress, 2003). This is the fastest method for manually searching the catalog. In this edition of the book, we chose to present two other methods, which are not as fast as this one, but provide better search results.

Figure 4-7. Adding a count of the number of Players 4. Switch to the Code view of the page. Add the following code immediately before opening the database connection in the DropDownList1_SelectedIndexChanged event handler (the additional code is shown in bold): // create the count query string strCommandTextCount = "SELECT COUNT(*) FROM Player WHERE @ManufacturerID = 0 OR Player.PlayerManufacturerID = @ManufacturerID"; SqlCommand myCommandCount = new SqlCommand(strCommandTextCount, myConnection); SqlParameter myParameterCount = new SqlParameter(); myParameterCount.ParameterName = "@ManufacturerID"; myParameterCount.SqlDbType = SqlDbType.Int; myParameterCount.Value = DropDownList1.SelectedValue; myCommandCount.Parameters.Add(myParameterCount); // open the database connection myConnection.Open(); // count the players for the manufacturer lblCount.Text = Convert.ToString(myCommandCount.ExecuteScalar()); 5. Execute the page. As well as seeing the selected Manufacturer s Players, the number of Players available will be displayed. Initially, the count will be 20, as you re not filtering the results. Selecting a Manufacturer, such as Apple, will filter the results, and the count of the Players will be adjusted accordingly, as shown in Figure 4-8.

If three-tier design is the overall goal of component-based programming, encapsulation is the best rule of thumb. Encapsulation is the principle that you should create your application out of black boxes that hide information. So, if you have a component that logs a purchase on an e-commerce site, that component handles all the details and allows only the essential variables to be specified. For example, this component might accept a user ID and an order item ID and then handle all the other details. The calling code doesn t need to worry about how the component works or where the data is coming from it just needs to understand how to use the component. (This principle is described in a lot of picturesque ways. For example, you know how to drive a car because you understand its component interface the steering wheel and pedals not because you understand the low-level details about internal combustion and the engine. As a result, you re able to transfer your knowledge to many different types of automobiles, even if they have dramatically different internal workings.)

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