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Note that at this moment, these attributes don t make much of a difference for a potential customer, because the products can t be ordered yet but that detail will be taken care of in the next chapters.

The data tier components that support the product attributes feature include three data tables (Attribute, AttributeValue, and ProductAttributeValue) and a stored procedure named GetProductAttributeValues. The three data tables follow: Attribute stores the name of the attributes, such as Size or Color. AttributeValue contains the possible attribute values for each attribute group. There is a One-to-Many relationship between Attribute and AttributeValue. Each attribute take Color, for example can have several values associated with it Red, Orange, Yellow, and so on. We need this table to help us to link the AttributeID (like 1 for Color) to AttributeValueIDs for its possible values (Red, Orange, Yellow, and so on). So, it will contain three columns: AttributeID, which is found in the Attribute table and tells us what kind of attribute we are talking about (for example, a color or a size); AttributeValueID, the integer we assign to uniquely identify the items in the AttributeValue table itself; and Value, which will hold the text description, like Orange, Red, Small, Large, and so on. ProductAttributeValue is an associate table implementing a Many-to-Many relationship between the Product and AttributeValue tables, with (ProductID, AttributeValueID) pairs (the AttributeValue table will allow us to quickly and easily populate this table).

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foreach(string description in controller.RoomGroupingIterator()) { // Do something with the description } The foreach syntax is simpler. It doesn t matter that we ve lost the information about which offset is which description, because that information is useless. Remember we are dealing with a linked list that can change its order however it pleases. Thus, having a numeric identifier is completely meaningless. The only reliable way to find a room grouping is to know its description or hold a specific index for the collection.

Note The system you re implementing doesn t permit an attribute to affect the price of the product. For example, a white balloon will always have the same price as a black balloon. If you need to have different product prices, you need to create different products. If you need to support attributes that affect the product price, one option would be to extend the ProductAttributeValue table by including data about the change in the product price and making many other changes and additions to the business tier and presentation tier code. We advise you not to make any changes at this time, as they would propagate to the following chapters as well, making the task of following the book more difficult.

Note Unless you are absolutely sure that the collection you are manipulating does not move elements

Create a scenario to forecast next year s projected incoming cash flow from registrants based on normal weather the day of the race. Note that the only change between this scenario and the previous scenario is the number of day-of-race registrants, which is expected to be higher for normal race-day weather than for rainy race-day weather. 1. Select cells B6 through F8. 2. Click Tools Scenarios. 3. Click Add.

You learned in 5 that database diagrams can help in understanding the relationships among data tables. A visual representation of these tables and of the relationships among the attribute tables can be seen in Figure 6-2. If you are new to databases, you should take a moment to study this diagram so that the following code is easier for you to negotiate and understand.

around, holding an index as a unique description of the object can be dangerous, and potentially could corrupt the state of an application. In this chapter, I have already illustrated two other techniques that can be used to reference a particular object: a handle and an indexer.

Figure 6-2. Diagram describing the relationships among the data tables required to implement product attributes Let s start by updating the BalloonShop database and then implementing the new stored procedure catalog_get_ProductAttributeValues in the following exercise.

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