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To continue exploring the world of relational databases, let s further analyze the three logical tables we ve been looking at so far. To make life easier, let s give them names now: the table containing products is Product, the table containing categories is Category, and the last one is our old friend, Department. No surprises here! These tables implement the most common kinds of relationships that exist between tables, the One-to-Many and Many-to-Many relationships, so you have the chance to learn about them.

So far, we ve discussed some basic tax concepts; the features of the tax application; and the theory of inheritance, interfaces, and components. We re ready to implement the tax engine. The preferred approach is to design the core idea and then create the other pieces, or dependencies.

Note Some variations of these two relationship types exist, as well as the less popular One-to-One relationship.

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Putting everything together and starting with the tax engine, we can create the following interface structure. public interface ITaxEngine { double CalculateTaxToPay(ITaxAccount account); ITaxDeduction CreateDeduction( double amount); ITaxIncome CreateIncome( double amount); ITaxAccount CreateTaxAccount(); } public interface ITaxAccount { void AddDeduction(ITaxDeduction deduction); void AddIncome(ITaxIncome income); double GetTaxRate( double income); ITaxDeduction[] Deductions { get; } ITaxIncome[] Income { get; } } public interface ITaxIncome { double RealAmount { get; } double TaxableAmount { get; } } public interface ITaxDeduction { double Amount { get; } } The structure has four interfaces: ITaxIncome, ITaxDeduction, ITaxEngine, and ITaxAccount. ITaxIncome and ITaxDeduction are pure behavioral interfaces. Pure behavioral means the interface does one thing, but it might be implemented in conjunction with other interfaces. ITaxEngine and ITaxAccount are behavioral functional interfaces. Behavioral functional means that the interfaces are typically implemented by themselves, and usually not with another interface.

In the One-to-One relationship, each row in one table matches exactly one row in the other. For example, in a database that allowed patients to be assigned to hospital beds, you would hope that there would be a Oneto-One relationship between patients and beds! Database systems don t support enforcing this kind of relationship, because you would have to add matching records in both tables at the same time. Moreover, two tables with a One-to-One relationship can be joined to form a single table. No One-to-One relationships are used in this book.

Set Target Cell Must Have Precedents Containing Numbers on the Active Sheet: This message appears if the cell referenced in the Set Target Cell box contains something other than a formula that depends on cells on the active sheet, some of which must be changing cells as referenced in the By Changing Cells box To address this problem, correct the contents of the Set Target Cell box to reference a single cell on the active worksheet containing a formula that depends on changing cells on the active worksheet Too Many Adjustable Cells: This message appears if the number of cells referenced in the By Changing Cells box exceeds Solver s limits To correct this problem, reduce the number of cells referenced in the By Changing Cells box.

Note Generally speaking, the naming convention used to define a type is verbose and self-explanatory.

One-to-Many Relationships The One-to-Many relationship happens when one record in a table can be associated with multiple records in the related table, but not vice versa. In our catalog, this happens for the Department-Category relation. A specific department can contain any number of categories, but each category belongs to exactly one department. Figure 5-2 better represents the One-toMany relationship between departments and categories.

I use names like TaxEngine, BaseTaxEngine when defining classes. But when I define interfaces, I use identifiers prefixed with a capital I, like ICanadaEngine and ITaxEngine. The capital I is a common convention used to identify interfaces. You should use this notation to be consistent with other .NET code.

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