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When the controller renders views, Cake will automatically look for a file with the same name as the action. Views correspond to actions contained in the controller script and are housed in a folder named after the controller. The first step in creating a view to be used as output for a controller script is to create the folder in app/views that matches with the name of the controller. View folders are lowercase and plural just like the naming convention for database tables. For the orders_controller.php file, you would create the folder app/views/orders. View files match actions in the controller, so they must be named accordingly. When a controller action is called, Cake will automatically search for a corresponding view following a specific naming scheme. Using the Orders example, let s say you wanted the user to be able to see the order before placing it. So, you create an action in the orders_controller.php file called review. In this action (which is literally a PHP function in the controller script), you pull some variables together and send them to the view following the MVC structure. Cake will automatically search for a view called app/views/orders/review.ctp (.ctp is the common extension for all Cake views, not .html or .php). Table 4-1 contains a breakdown of the naming conventions for model, controller, and view files. Notice that the view files are named after a matching action in the controller and that the folder name containing the views matches the name of the controller.

The board s activities director has committed to producing these tools on compact disc (CD), which will be distributed to attending club members at the annual meeting. The board s treasurer and activities director have decided to use the Excel what-if tools to produce these reports and tools. The following sections present a series of exercises to allow you to practice producing these reports and tools.

Using a dedicated database component is a great way to keep your code efficient and wellorganized. It also makes it easy for you to apply changes later. However, this has a drawback namely, you need to write quite a bit of code to create a web page and a separate data-access component. In 16, you saw that you could simplify your life by using components such as the SqlDataSource to encapsulate all your data access details. Unfortunately, that code-free approach won t work if you re using a separate component or will it It turns out there is a way to get the best of both worlds and use a separate data-access component and easier web page data binding. Instead of using the SqlDataSource, you use the ObjectDataSource, which defines a link between your web page and your component. This won t

save you from writing the actual data access code in your component, but it will save you from writing the tedious code in your web page to call the methods in your component, extract the data, format it, and display it in the page.

Note The ObjectDataSource allows you to create code-free web pages, but you still need to write the code

s Note The earliest versions of Cake used the file extension .thtml for view files, but this was changed to

in your component. You shouldn t view this as a drawback after all, you need to write this code to get fine-grained control over exactly what s taking place and thereby optimize the performance of your data access strategy.

In the following sections, you ll learn how to take the existing DBUtil class presented earlier and use it in a data-bound web page. You ll learn how to replicate the example shown in Figure 23-9 and Figure 23-10 without writing any web page code.

.ctp for CakePHP 1.2. If you do come across older Cake applications, be sure to change these view files extensions to the now standardized .ctp extension.

In this section, you will use Goal Seek to forecast next year s total club membership dues. This section s exercises are available in the Excel workbook named Ridge Running Exercises.xls, which is available for download from the Source Code area of the Apress web site (http://www.apress.com). These exercises data is on the workbook s Membership Dues worksheet, as shown in Figure 5-1.

Essentially, the ObjectDataSource allows you to create a declarative link between your web page controls and a data access component that queries and updates data. Although the ObjectDataSource is remarkably flexible, it can t support every conceivable component you could create. In fact, for your data component to be usable with the ObjectDataSource, you need to conform to a few rules: Your class must be stateless. That s because the ObjectDataSource will create an instance only when needed and destroy it at the end of every request. Your class must have a default, no-argument constructor. All the logic must be contained in a single class. (If you want to use different classes for selecting and updating your data, you ll need to wrap them in another higher-level class.) The query results must be provided as a DataSet, DataTable, or some sort of collection of objects. (If you decide to use a collection of objects, each data object needs to expose all the data fields as public properties.) Fortunately, many of these rules are best practices that you should already be following. Even though the DBUtil class wasn t expressly designed for the ObjectDataSource, it meets all these criteria.