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The Show Trial Solution dialog box will display one of the following messages: Solver Paused, Current Solution Values Displayed on Worksheet: This message appears if the Solver Options dialog box s Show Iteration Results check box is selected or you press the Esc key to interrupt Solver. The Maximum Iteration Limit Was Reached; Continue Anyway : This message appears when Solver has completed the maximum number of iterations allowed in the Solver Options dialog box s Iterations box. The Maximum Time Limit Was Reached; Continue Anyway : This message appears when Solver has run for the maximum number of seconds allowed in the Solver Options dialog box s Max Time box. In the Show Trial Solution dialog box, you can either click the Stop button to stop Solver s solution process and display the Solver Results dialog box, or click the Continue button to have Solver continue the solution process and display its next trial solution. You can also click the Save Scenario button to save the current trial solution s results as a scenario.

Here s the template column used earlier for stock information with an editing template: <asp:TemplateField HeaderText="Status"> <ItemStyle Width="100px" /> <ItemTemplate> <b>In Stock:</b> <%# Eval("UnitsInStock") %><br /> <b>On Order:</b> <%# Eval("UnitsOnOrder") %><br /> <b>Reorder:</b> <%# Eval("ReorderLevel") %> </ItemTemplate> <EditItemTemplate> <b>In Stock:</b> <%# Eval("UnitsInStock") %><br /> <b>On Order:</b> <%# Eval("UnitsOnOrder") %><br /><br /> <b>Reorder:</b> <asp:TextBox Text='<%# Bind("ReorderLevel") %>' Width="25px" runat="server" id="txtReorder" /> </EditItemTemplate> </asp:TemplateField> Figure 17-14 shows the row in edit mode When binding an editable value to a control, you must use the Bind() method in your data binding expression instead of the ordinary Eval() method Only the Bind() method creates the two-way link, ensuring that updated values will be returned to the server..

Here is where Cake s scaffolding comes in. Recall that in Listing 3-2, line 4, you called the object variable $scaffold. When the dispatcher receives the URL and finds that you are requesting the Items controller, it looks for a default function named index(). First, however, it notices that you have told it to render the scaffolding (line 4), and since you haven t specified a function in the controller called index() yet, the dispatcher will fetch the built-in views and render a standard list view for the items table in the database. After launching the Items controller in the browser, you should get a screen like Figure 3-2.

Figure 17-14. Using an edit template One interesting detail here is that even though the item template shows three fields, the editing template allows only one of these to be changed. When the GridView commits an update, it will submit only the bound, editable parameters. In the previous example, this means the GridView will pass back a @ReorderLevel parameter but not a @UnitsInStock or @UnitsOnOrder parameter. This is important, because when you write your parameterized update command, it must use only the parameters you have available. Here s the modified SqlDataSource control with the correct command: <asp:SqlDataSource ID="sourceProducts" runat="server" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="SELECT ProductID, ProductName, UnitPrice, UnitsInStock, UnitsOnOrder,ReorderLevel FROM Products" UpdateCommand="UPDATE Products SET ProductName=@ProductName, UnitPrice=@UnitPrice, ReorderLevel=@ReorderLevel WHERE ProductID=@ProductID"> </asp:SqlDataSource>

Now that you have your template ready, why not add an extra frill, such as a validator, to catch editing mistakes In the following example, a RangeValidator prevents changes that put the ReorderLevel at less than 0 or more than 100:

Figure 3-2. Cake s scaffolding feature rendering a list view of the items table Notice that no items appear in this list view; you haven t created any yet. Normally, you would have to go into the Items controller, create a new function named add(), and then specify each operation for adding a new record in the items table. But Cake s scaffolding will handle all the CRUD operations for you. You can see the link on the screen named New Item. Click it, and you will have a complete add view generated by the scaffold (see Figure 3-3). Scaffolding is useful because in one line of code you can translate typical databasehandling methods into a web interface. In a short amount of time, you can interact with the database through your Cake application and, consequently, the browser as well. Later, you ll build more dynamic schemes that will use multiple tables simultaneously, and the scaffolding will tell you quickly whether you ve effectively linked the associations in the models. Valuable as it is, Cake s scaffolding does have some limitations. For example, you cannot easily change the look or order of the fields in the forms. To do that, you need to generate a different view file separate from the scaffolding views, which would also require you to write the whole add() and edit() functions in the Items controller. For this and other reasons, the scaffold feature is not intended for production-level output. You will discover more about its utility, however, as you create more elaborate skeletons from which to build more powerful applications.