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'Set up the SettingName Parameters dbCmdParametersAdd("@SettingName", _ DataSqlDbTypeVarChar)Value = SettingName dbConnOpen() ReadValueFromDatabase = CStr(dbCmdExecuteScalar()) dbConnClose() Catch ex As Exception Return StringEmpty End Try End Function First, let s discuss the objects used in this function SQL is a string variable representing the parameterized SQL statement that retrieves the value associated with the name passed into the function The dbConn variable is a SqlConnection object used to connect to the database where your Settings table is located Notice that the connection string used to initialize dbConn comes right from the Config class you implemented earlier, so make sure the connection string in your Webconfig file has the appropriate connection information Finally, the dbCmd is a SqlCommand object that you use to set up parameters and execute the SQL statement you defined earlier.

After the variables are defined, the code in the function is straightforward First, the code sets up the @SettingsName parameter name, type, and value for the dbCmd object using the tactics described earlier Then it opens the database and executes the statement using the ExecuteScalar function of the dbCmd object ExecuteScalar returns a single value from the database as an Object that must be cast into its target type In this case, it is a string containing the value of the setting name passed into the function The result of ExecuteScalar is assigned to the name of the function, indicating that it is to be returned when the function exits After that, the code closes the database, the function terminates, and the value is returned If an error occurs at all during this process, an empty string is returned as a default value.

you are using Tomcat as explained in this example, you will find servlet.jar in the /lib directory of the Tomcat installation.

With this function, reading a setting from the database can be accomplished using the following statement: Dim MyString as String = ReadValueFromDatabase("MyString") Dim MyInteger as Integer CInt(ReadValueFromDatabase("MyInteger") Note that if ReadValueFromDatabase("MyInteger") returns an empty or nonnumerical string, then an exception will be thrown..

To get started, you will need the chapter source that comes along with this book, which contains all the resources for the next sections.

One of the most important aspects of reducing data duplication is intelligent searching functionality. Searching is often the first line of defense against data duplication because users are expected to check to see if data exists before entering it into a system. The problem is that most

searches use exact-match searches. This can be detrimental in terms of data duplication because it requires the user to enter search criteria exactly as they appear in the database, which is problematic because data can have alternate spellings, abbreviated forms, or be entered incorrectly. SQL soundex functions allow you to search using phonetics instead of exact spelling. In other words, you can use soundex functions to search for words that sound like the word entered. For example, say you have a database full of U.S. presidents. One of your users is searching for Harry Truman in the database. Because the user is a horrible speller, they are actually searching for Hairy Trueman. If your system uses exact-match searching, then the search won t turn up any results. If your system uses phonetic searching with the SQL soundex functions, then a search for Hairy Trueman will match on Harry Truman because Hairy and Harry are phonetic matches, and Trueman and Truman are also phonetic matches. You should become familiar with two SQL soundex functions if you want to use phonetic searching. One is the Soundex function, and the other is the Difference function. They are covered next.

Listing 2-5. LoggingServlet.java import import import import import javax.servlet.*; javax.servlet.http.*; java.io.PrintWriter; java.io.IOException; org.apache.log4j.*;

Create a project to host the game. Here is how: 1. Click New Android Project from the toolbar, and enter the following information (see Figure 3-4): 2. Name: ch03.SpaceBlaster Build Target: Android 1.1 or Android 1.5 Application Name: Space Blaster Package Name: ch03.game.sb Activity: SpaceBlaster Min SDK version: 3 for 1.5, 2 for 1.1