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At the heart of the application is an exchange rate, currency units, and a calculation that combines the exchange rate with the currency units. Thus, a logical first step would be to write test code that combines these elements, something like this: CurrencyTrader cls = new CurrencyTrader(); cls.ExchangeRate = 1.31; double haveUSD = 100.0; double getEUR = cls.Convert(haveUSD); Console.WriteLine("Converted " + haveUSD + " USD to " + getEUR); This code is unique in that the test code has all of the responsibility of making sure the correct data is assigned to the structure. To clarify this, here is the same code with random variable names used instead of the identifiers for the currency variables: CurrencyTrader cls = new CurrencyTrader(); cls.ExchangeRate = dddddedfasffsdf; double ukfkisd = 100.0; double didkfdbnfd = cls.Convert(ukfkisd); Console.WriteLine("Converted " + ukfkisd + " USD to " + didkfdbnfd); This code is structural, rather than architectural. Structural code is code that requires an intelligent programmer a programmer who knows what the individual items mean. Architectural code, on the other hand, is more idiot-proof and requires less knowledge, because many parts are encapsulated. The user needs to understand only how to use the classes. Put another way, structural code is knowing how to add two numbers. Architectural code is knowing how to punch in the two numbers and hit the plus sign on a calculator. You can argue that by not knowing how to add and relying on the calculator, you have no idea if the calculator is doing its job properly. That is a valid point, and that is why tests are important to ensure that the calculator is doing its job properly.

When setting an identity column, you can specify an identity seed, which is the first value that SQL Server provides for that column, and an identity increment value, which specifies the number of units to increase between two consecutive records. By default, identity seed and identity increment values are both set to 1, meaning that the first value will be 1 and the following ones will be generated by adding 1 to the last created value. You don t need to specify other values because you don t care what values are generated anyway. Although it wasn t shown in the earlier Figure 4-9, DepartmentID in your Department table is an identity column. You ll learn how to set identity columns a bit later, when creating the Department table.

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The first test code, which is structural, is not wrong. Structural code forms the basis of what is called a base class. A base class is a class that provides certain functionality that will be reused by other classes. In this case, converting the currency units is functionality that we will need in both the active trader and hotel trader. You define base classes so that you get consistent behavior when performing identical operations. In lieu of base classes, you would need to copy and paste the functionality to reuse it. Base classes have some very important characteristics: Only developers who understand what the base class code is trying to do should use the base class code. To control access, we will use scope. Base classes describe properties and methods. To make use of the base class, the descriptions are assembled to perform a calculation. For example, to perform a currency conversion, you need to manually define the exchange rates and currency units, and execute the conversion method. The manual step-by-step approach gives the developer flexibility.

Note The generated values for identity columns are unique over the life of your table. A value that was generated once will never be generated again, even if you delete all the rows from the table. If you want SQL Server to restart numbering from the initial value, you need to either delete and re-create the table or truncate the table using the TRUNCATE SQL command. Truncating a table has the same effect as deleting and creating it again.

Base classes need extensive testing because their functionality will be used throughout your code. If the base classes have bugs, most likely a large chunk of your code will have bugs.

Indexes are database objects meant to increase the overall speed of database operations. They work by maintaining a special structure of data that reflects the contents of the indexed table, which enables very fast searches on the table. In consequence, indexes speed up table reads, but they slow down insert, delete, and update operations because on those operations, the database server needs to alter not only the table, but also the additional structures created by its index (or indexes). In most real-world applications, the vast majority of database operations are read operations, and the presence of indexes leads to significant overall performance improvements. On a table, you can create one or more indexes, with each index working on one column or on a set of columns. When a table is indexed on a specific column, its rows are either indexed or physically arranged based on the values of that column and the type of index. This makes search operations on that column very fast. If, for example, an index exists on DepartmentID, and then you do a search for department 934, the search is performed very quickly. You should keep the following in mind about indexes:

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