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Log4JS is, as described on its website, a JavaScript logging class similar in spirit to Apache s log4j. Log4JS writes logging output to a customizable logging class. Log4JS can be found at http://log4js.sourceforge.net. Four logging classes are available: alert, write, popup, and console. The alert class pops up logging messages in an alert box. The write logger writes to a new page in the browser. The popup logger writes messages to a separate browser window, which is convenient for keeping track of the log messages. Finally, the console logger writes to Safari s console or to a pop-up window if the browser is not Safari. Log4JS is similar to log4j in that it defines different logging thresholds. The logging thresholds for Log4JS are, in increasing order, DEBUG, INFO, WARN, ERROR, FATAL, and NONE. A logger will only log messages that are of equal or greater value to the logger s threshold. For example, if a logger is created with a threshold of WARN, then logging a message with the info() method will produce no output, but logging a message with the warn(), error(), or fatal() method will output the message. If you ve ever used log4j then using Log4JS will be rather easy. Figure 2-14 shows the simple test used to demonstrate Log4JS. It s a simple page that uses JavaScript to calculate the sum of two integers. Log4JS is used to log messages during the execution of the script. The page s source code is shown in Listing 2-3.

This chapter covered how you can extend your applications directly onto users desktops. You saw how to use the spreadsheet-excel gem to create an Excel spreadsheet report, which can be extremely helpful to end users. Then you created a desktop application that displays beautiful graphs using Gruff and Active Record. As you can see, Ruby isn t a web-only or console-only language. It offers a great deal of flexibility for creating applications that extend directly to the user s desktop in familar formats, including thick-client and common office applications. However, there s no question that Ruby is best known for its usage on the Web. In the next chapter, you ll discover how all of the techniques you ve learned so far can be used with Ruby on Rails, the popular web development framework.

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The ADO.NET components live in several different namespaces in the .NET class library. Together, these namespaces hold all the functionality of ADO.NET. Table 15-2 describes each data namespace.

Contains fundamental classes with the core ADO.NET functionality. This includes DataSet and DataRelation, which allow you to manipulate structured relational data. These classes are totally independent of any specific type of database or the way you connect to it. Not used directly in your code. These classes are used by other data provider classes that inherit from them and provide versions customized for a specific data source. Contains the classes you use to connect to an OLE DB data source and execute commands, including OleDbConnection and OleDbCommand. Contains the classes you use to connect to a Microsoft SQL Server database (version 7.0 or later) and execute commands. These classes, such as SqlCommand and SqlConnection, provide all the same properties and methods as their counterparts in the System.Data.OleDb namespace. The only difference is that they are optimized for SQL Server and provide better performance by eliminating the extra OLE DB layer (and by connecting directly to the optimized TDS interface). Contains structures for SQL Server specific data types such as SqlMoney and SqlDateTime. You can use these types to work with SQL Server data types without needing to convert them into the standard .NET equivalents (such as System.Decimal and System.DateTime). These types aren t required, but they do allow you to avoid any potential rounding or conversion problems that could adversely affect data. Contains the classes you use to connect to an Oracle database and execute commands, such as OracleConnection and OracleCommand. Contains the classes you use to connect to a data source through an ODBC driver and execute commands. These classes include OdbcConnection and OdbcCommand.

eporting does not take place in a vacuum. Reports are written for a specific purpose for a given set of users. Technical choices like what language do I use and how do I deliver the information are heavily influenced by the users and by the purpose of the report. After all, your users must be able to access the report for it to be useful. Perhaps the most powerful method to deliver reports to your user is via the World Wide Web. Users can access the information from virtually any Internet-connected device, and because of the Internet s ubiquity, you probably won t need to do any special configuration for their computers just give users the web address, and they should be all set. In this chapter, you ll learn how to make your reports accessible from the Web. Let s start with a quick look at your choices for accomplishing this.

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