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t this point, we have a complete and functional e-commerce web site. However, this doesn t stop us from adding even more features to make it more useful and pleasant for visitors. By adding a product reviews system to your web site, you can increase the chances that visitors will return to your site, either to write a review for a product they bought or to see what other people think about that product. A review system can also help you learn your customers tastes, which enables you to improve the product recommendations and even make changes in the web site or the structure of the product catalog based on customer feedback. To make things easy for both the customer and us, we ll add the list of product reviews and the form to add a new product review to the product details pages. The form to add a new product will show up for only registered users, because we decided not to allow anonymous reviews (however, you can easily change this if you like). We ll create the code for this new feature in the usual way, starting from the database and finishing with the user interface (UI).

Figure 4-11. Missing connections for New York Figure 4-11 illustrates that recursion with value types does not work. It shows that there are connections from New York to Montreal. But following the connection to Montreal, it would appear that New York has no connections, which is blatantly false, because we can see the connection from New York to Montreal. When value types are assigned, you are copying contents of the value type and thus getting a snapshot of the state of an object at some period in time. In essence, the code illustrates the chicken-and-egg problem of defining the connections for a particular city and then assigning them. For value types, how can you assign the connection of one city to another when the to-be-assigned connection does not exist The short answer is you can t. The long answer is you can, but it would mean executing an infinite loop, which is of no use to us, because we want to do something with the data once it has been assigned.

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The product reviews feature is simple enough. It is governed by two simple design decisions: The list of reviews and the interface elements necessary for adding new reviews should be displayed below the list of product recommendations on the product details pages, as shown in Figure 21-1. Only registered users can write product reviews. If the user is not logged in, we should invite the reader to log in and write a review, as shown in Figure 21-2. We store the product reviews in a database table named review, which is manipulated by two stored procedures CatalogGetProductReviews and CatalogAddProductReview whose names are self-describing. The other code we ll write will only package this functionality in a form that is accessible to your visitors.

To fix the chicken-and-egg problem, we need to use reference types instead of value types. This means we need to change the declaration of Node from a struct to a class, as follows: public class Node { public static Node[] RootNodes; public string CityName; public double X; public double Y; public Node[] Connections; public Node(string city, double x, double y) { CityName = city; X = x; Y = y;

Figure 21-2. Log in and write a review!

Connections = null; } } The change is a one-liner. After the switch, if we executed the same assignment code as in the previous section when Node was a value type, the data structure shown in Figure 4-12 would be created.

The Sensitivity report (available only for problems that do not contain integer constraints), shown in Figure 4-12, lists the following: The adjustable cells addresses and their names if ones were assigned The adjustable cells final values after Solver was run The reduced cost, which is the change in the optimum problem s outcome per unit change in the upper or lower bounds of the variable The objective coefficient, which measures the relative relationship between the changing cell and the target cell (for example, if a changing cell s value is 1.32, and the target cell s value is 96, the objective coefficient will be 1.32 divided by 96, or 0.01375) The allowable increase and allowable decrease, which indicate how much the problem s objective coefficient can change before the optimum solution changes

Follow the steps of this exercise to create the database table, stored procedures, business tier, and presentation tier functionality required for the product reviews feature.

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