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Inside WordCount, the challenge is to find an effective way to count how many times @Word appears in @Phrase, because SQL Server doesn t provide a function for this (otherwise, you would have used that function instead of creating your own, right ). The straightforward solution, which implies splitting the phrase where it has spaces (or other delimiter characters) and comparing word by word, is very slow. We ve found a trick that performs the same functionality about five times faster. SQL Server provides the REPLACE function, which replaces all occurrences of a substring in a string with another substring. REPLACE doesn t tell you how many replacements it did, but it returns the modified initial string. REPLACE works much faster than a custom created UDF or stored procedure because it s an internal SQL Server function. You ll use REPLACE to replace the word to search for with a word that is one character longer. Say you want to count how many times the word red appears in This is a red, red mask. Replacing red with redx generates This is a redx, redx mask. The length difference between the initial phrase and the modified phrase tells you how many times the word red appears in the initial phrase (nice trick, eh ). The code that does this appears as follows: /* @BiggerWord is a string one character longer than @Word */ DECLARE @BiggerWord VARCHAR(21) SELECT @BiggerWord = @Word + 'x' /* Replace @Word with @BiggerWord in @Phrase */ DECLARE @BiggerPhrase VARCHAR(2000) SELECT @BiggerPhrase = REPLACE (@Phrase, @Word, @BiggerWord) /* The length difference between @BiggerPhrase and @phrase is the number we're looking for */ RETURN LEN(@BiggerPhrase) - LEN(@Phrase)

Using the component in an actual ASP.NET page is easy. Essentially, your website needs a copy of your component in its Bin directory. ASP .NET automatically monitors this directory and makes all of its classes available to any web page in the application. To create this copy, you use a Visual Studio feature called project references. Here s how it works: First, select your website in the Solution Explorer. Then, select Website Add Reference from the menu. This brings you to the Add Reference dialog box. You can take two approaches here: If your class library project is in the same solution, use the Projects tab. This shows you a list of all the class library projects in your assembly (see Figure 24-4). Select the class library, and click OK. If your class library is in a different solution, or you have the compiled DLL file only (perhaps the component was created by another developer), use the Browse tab (see Figure 24-5). Browse through your directories until you find the DLL file, select it, and click OK.

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Note In order to add a reference to an assembly, you must have already compiled the component project

You then took a brief look at scalar functions and the ExecuteScalar() method as an alternative for returning information from the database when you want to return only one value. At the end of the chapter, you looked at basic error handling and wrote an error handler that ensures you never leave any open connections. The examples that you ve seen so far have been simple pages that performed one task to give you a foundation in using databases and the different queries you can perform. In the next four chapters, you ll build on the techniques you ve developed and learn how to build interactive pages. You ll also start to see the real power that s available to data-driven Web sites.

Either way, .NET copies the compiled DLL file to the Bin directory of your web application (see Figure 24-6). The nice feature is that this file is automatically overwritten with the most recent compiled version of the assembly every time you run the website project. (When you use a project reference instead of a file reference, Visual Studio goes one step further. Every time you run the website project, Visual Studio automatically compiles and updates the component assembly, if you ve changed any part of its source code.)

The implementation shown earlier is fast, but has one drawback: It can t be used to search for words that are similar to (sound like) the words entered by the visitor. For example, in the current database, searching for balloon generates many results, whereas searching for balloons generates a single result. This may or may not be what you want you must decide what works best for your site. You can change this behavior by changing the WordCount function. However, the version that recognizes similar versions of words is very slow because you can t use the REPLACE function anymore you need to manually split the phrase word-by-word in SQL code, which is a time-consuming process. We ll present this modified version of WordCount at the end of the chapter for your reference.

Figure 24-6. A component in the Bin directory When you add a reference, Visual Studio also allows you to use its classes in your code with the usual syntax checking and IntelliSense. If you don t add the reference, you won t be able to use the component classes (and if you try, Visual Studio interprets your attempts to use the class as mistakes and refuses to compile your code).

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