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because ADO.NET uses connection pooling to keep a small set of open connections ready to use. As long as you don t change the connection string, every time you call SqlConnection.Open() you receive one of these already-open connections, thereby avoiding the overhead of setting up a new connection.

The code uses its own private FillDataSet() function to make the code more concise. This isn t made available to clients. Instead, the GetItems() and GetCategories() methods use the FillDataSet() function.

In the controller file you will need to extend the AppController object already being called by Cake when the application is launched. To do so, another important convention is at work. Listing 4-1 shows how to name the controller class in the file and how to extend the AppController object. Listing 4-1. Inside the Controller 1 2 3 4 < class RecordsController extends AppController { } >

To use this component in a web application, you first have to make sure the appropriate connection string is configured in the web.config file, as shown here: <configuration> <connectionStrings> <add name="AdBoard" connectionString= "Data Source=localhost\SQLEXPRESS;Initial Catalog=AdBoard;Integrated Security=SSPI" /> </connectionStrings> ... </configuration> Next, compile and copy the component DLL file, or add a reference to it if you re using Visual Studio. The only remaining task is to add the user interface for the web page that uses the component. To test this component, you can create a simple test page. In the example shown in Figure 23-9, this page allows users to browse the current listing by category and add new items. When the user first visits the page, it prompts the user to select a category.

he preceding chapters have introduced four Excel what-if data analysis tools: Goal Seek, data tables, scenarios, and Solver. This chapter presents a case study demonstrating how a fictional running club, called the Ridge Running Cooperative, might use each of these what-if tools to produce reports and tools to assist runners. In the exercises in this chapter, you will use Goal Seek to forecast membership dues, data tables to forecast race paces, scenarios to forecast race-day cash flow, and Solver to forecast race-day finish times as well as pair up race relay teams.

Figure 23-9. The AdBoard listing Once a category is chosen, the matching items display, and a panel of controls appears, which allows the user to add a new entry to the AdBoard under the current category, as shown in Figure 23-10.

In order to access the component more easily, the web page imports its namespace: Imports DatabaseComponent The page code creates the component to retrieve information from the database and displays it by binding the DataSet to the drop-down list or GridView control: Public Partial Class AdBoard Inherits System.Web.UI.Page Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles Me.Load If Not Page.IsPostBack Dim DB As New DBUtil() lstCategories.DataSource = DB.GetCategories() lstCategories.DataTextField = "Name" lstCategories.DataValueField = "ID" lstCategories.DataBind() pnlNew.Visible = False End If End Sub Protected Sub cmdDisplay_Click(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles cmdDisplay.Click Dim DB As New DBUtil() gridItems.DataSource = DB.GetItems( _ Val(lstCategories.SelectedItem.Value)) gridItems.DataBind() pnlNew.Visible = True End Sub Protected Sub cmdAdd_Click(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles cmdAdd.Click Dim DB As New DBUtil() Try DB.AddItem(txtTitle.Text, txtDescription.Text, _ Val(txtPrice.Text), Val(lstCategories.SelectedItem.Value)) gridItems.DataSource = DB.GetItems( _ Val(lstCategories.SelectedItem.Value)) gridItems.DataBind()

Notice that on line 2 in Listing 4-1 I ve extended the AppController object by starting a new class and naming the class RecordsController. The name of the class will always need to match up to the file name of the controller and be camel case1 with the word Controller. If, for example, this controller were for the orders table, line 2 would contain the class name OrdersController, and the file name would be orders_controller.php. If you follow this convention, Cake will be able to dispatch the request to the correct controller and run the correct action.

Catch err As FormatException ' An error occurs if the user has entered an ' invalid price (non-numeric characters). ' In this case, take no action. ' Another option is to add a validator control ' for the price text box to prevent invalid input. End Try End Sub End Class