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The calling code can t use the same elegant CustomerAccount objects, but it can be assured that account transfers are protected from error. Because all the database operations are performed at once, they can use a database stored procedure for greater performance and can use a transaction to ensure that the withdrawal and deposit either succeed or fail as a whole:

Note Using the ISNULL and NULLIF functions avoids calling WordCount twice for each word (this trick significantly improves performance). Visit SQL Server 2005 Books Online for more information about how these functions work.

To iterate through the contents of a DataReader, you use its Read() method. If you haven t worked with reader objects in general before, the idea is simple. A reader has a pointer that you use to keep track of where you are in the information coming through your reader. If you like, it s the same kind of thing that happens when you use your finger to keep your place on a book page. Until you open the book and start to read, you can t see anything. The same thing applies in code. You can t access anything until you call Read() the first time, and each time you call Read() after that, the DataReader lets another row through for you to use. Read() will also return a Boolean value each time you call it: true if there s another row for you to work with and false if you ve reached the end of the query results, as shown in Figure 5-1.

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' Set the account and transfer details. Dim amount As Decimal = 1000 Dim accountIDOne As Integer = 122415 Dim accountIDTwo As Integer = 123447 AccountUtility.FundTransfer(accountIDOne, accountIDTwo, _ amount)

In a mission-critical system, transactions are often required. For that reason, classes that retain little state information are often the best design approach, even though they aren t quite as satisfying from an object-oriented perspective.

You ll implement paging in a bit different way than you did in 4. Back then, you populated the @Products table variable while assigning a row number to each row using the ROW_NUMBER() function, like this: INSERT INTO @Products SELECT ROW_NUMBER() OVER (ORDER BY Product.ProductID) AS Row, ... As you can see, the list of products is sorted on their product IDs before being numbered. This criterion doesn t apply to the list of search results, which need to be sorted in descending order on their search ranking (so more relevant search results are always listed first). We can solve this problem by performing the search in a subquery and then applying the ROW_NUMBER() function on the results (so, using the same technique as in 4) or by using a new trick. We chose the latter method, of course, to play with yet a new T-SQL thing. This time, when creating the @Products table variable (see the following code snippet), you ll make RowNumber an IDENTITY column. This means that it will be automatically assigned

Figure 5-1. Working through rows in a DataReader using the Read() method This means that you can use the call to Read() as the condition in a while loop. If your query returns no results, the first call to Read() ends the loop before you do anything. If not, the code will keep looping until there are no more results. In short, your page needs to have this skeleton code in it: // create the connection SqlConnection myConnection = new SqlConnection(); try { // configure the connection // create the command // open the database connection // run the query SqlDataReader myReader = myCommand.ExecuteReader(); // parse the results while (myReader.Read() == true) {

There is one potential compromise. You can create stateful classes to represent common items such Tip as accounts, customers, and so on, without adding any functionality. Then, you can use these classes as data packages to send information to and from a stateless utility class. (These are the data objects that were described in the beginning of this chapter.)

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