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Okay, let s write some code! You ll start by writing the DatabaseHandler class, which will be a support class that contains generic functionality needed in the other business tier methods. Then you ll create a business tier class named Catalog, which uses the DatabaseHandler class to provide the functionality required by the presentation tier. The Catalog class will contain methods such as GetDepartments (which will be used to generate the list of departments), GetCategories, and so on. The only method we ll need to add to the Catalog class in this chapter is GetDepartments. Although in this chapter we won t need all this functionality, we ll write the complete code of the DatabaseHandler class. DatabaseHandler will have the following methods: Prepare is a wrapper for the PDO::prepare method, which is used to create a prepared statement. Execute executes an SQL command that doesn t return records from the database, such as INSERT, DELETE, or UPDATE statements. GetOne returns a single value from the database. We can use this method to call database functions that return a single value, such as one that returns the subtotal of a shopping cart. * GetRow is used to execute queries that return a single row of data. GetAll is used to execute queries that return more rows of data, such as when requesting the list of departments.

17-8

TABLE 1-1

One of the disappointments for C++ programmers moving to C# is the lack of templates. Templates provide the ability to create parameterized types. For example, if you create an integer array class, you might someday need a floating-point array class. Templates provided a clean way to accomplish this, without requiring you to cut and paste code from the integer array class to the floating-point array class. Templates generally were implemented in such a way that behind the scenes the compiler was in fact doing almost exactly that, but it wasn t something the programmer needed to get involved with. It s extremely unlikely that templates will ever be added to C#. Currently, the developers of C# are looking at other alternatives for providing generic implementations that won t involve templates as such. The .NET Framework provides features such as array classes, so scenarios such as the preceding example won t likely present a problem. In other scenarios, however, some form of generics would be extremely useful.

5. Load index.php in your browser, click on a product to view its product details page, and admire the results (refer to Figure 16-1 at the beginning of this chapter). You must be logged in to add new reviews.

Overview The sign of an effective development tool is that it offers sufficient flexibility so that it works for you instead of forcing you to change your lifestyle to accommodate it Until Microsoft Visual Studio NET appeared, previous versions, in my opinion, were only good enough for debugging, not for editing and general use I'm pleased to say that Visual Studio NET, although still having some quirks, is what I'm using for my editing and development needs The main reason is that compared to previous versions of Visual Studio, Visual Studio NET is a paragon of extensibility If you don't think something behaves correctly or you think a feature is missing, you'll find that Visual Studio NET finally contains the capabilities to actually correct and fix the shortcoming.

This call is required by the Web Form Designer. <System.Diagnostics.DebuggerStepThrough()> _ Private Sub InitializeComponent()

Even better is that today I have an answer to one of the most common questions I used to get when I worked at NuMega: How did you guys get a window inside Visual Studio Well, my answer doesn't matter anymore because anyone can do it Nearly every developer has an idea for a tool or a view that belongs inside the IDE but until now has had no way of getting that tool or view in there With the new Visual Studio NET extensibility model, anyone can now put his or her own windows inside the IDE The means of doing this is also documented and supported much better than the special Package Partner Program you had to go through in previous versions of Visual Studio to hook into the IDE There are three elements to the extensibility functionality: macros, add-ins, and wizards Visual Studio .

With Qt s rich collection of widgets, you might think there isn t much need or room for you to create your own widgets, but there are two reasons you might want to. First, there may simply not be a widget with the appearance and behavior your need; creating a new widget by composing simpler widgets or by performing the widget drawing and event handling yourself lets you create an entirely custom widget. Second, creating a custom widget is the trick to performing your own drawing in an application using other widgets. Qt provides the QWidget class, a base class to all widgets; when you create a widget, you subclass QWidget and override specific methods to indicate how your widget should set its size relative to its layout, handle incoming events, and paint its contents.

To provide access to the web page, create a link to the HTML file. You can add links to a Links list, or place links anywhere on a SharePoint web part page using the Content Editor Web Part.