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In the previous section we looked at SQL and how to use it with the SQLite library, a library that provides a basic database system on the local machine. More commonly, however, you might want to connect to more mainstream database servers, such as those running on MySQL, PostgreSQL, MS SQL Server, or Oracle. In this section we ll look quickly at how to connect to each of these types of databases.

Note A library called DBI is available that provides a database-agnostic interface between Ruby and

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database systems. In theory you can write a program that talks with any database, and easily switch between different types of databases as long as you use DBI. In practice this isn t always possible, but learning how to use DBI can give you access to using MySQL, PostgreSQL, and Oracle in the future. Links to a number of resources about DBI are supplied in Appendix C.

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1. The name lambda comes from the Greek letter , which is used in mathematics to indicate an anonymous function.

MySQL is the most common database system available from Web hosting providers. This is because MySQL comes in an open source variety that s free to download and use. MySQL also has a reputation as being simple to use, and a large ecosystem has built up around it. MySQL support is given to Ruby with the MySQL library that s available as a RubyGem in generic Unix and Windows varieties. To install, use this code:

Note On OS X, installing the mysql gem can be easier said than done. A number of problems can arise,

room and technology setup, stand in the physical location where you ll present and give a complete delivery of the presentation. During a presentation, all eyes are on you, and people will watch for cues that indicate your enthusiasm and interest in a topic. If you speak in a monotone and appear disinterested, you shouldn t be surprised if the audience mirrors your lack of enthusiasm. Instead, vary your voice to emphasize important points, and pause for effect when you want a particular point to sink in. You ve been working hard on your story let your enthusiasm come through your voice, as well as through your facial expressions. As you rehearse, you re sure to run into rough spots or things that you want to change in the presentation, so keep a piece of paper handy for jotting down revision notes to yourself as you go. Then return to the presentation to make any nal changes to the slides. Ask someone on your team to attend your rehearsal and give you honest feedback about the presentation, because you re better able to improve with the help of an outsider s perspective. People are inclined to mention only good things, so ask your evaluators not only to con rm what you do well, but also to suggest speci c ways you can improve. It s a good idea to ask for a range of opinions, because each viewer will give you advice from a different perspective. Take account of whatever feedback you get, and make adjustments as needed.

as covered at http://www.caboo.se/articles/2005/08/04/installing-ruby-mysql-bindings2-6-on-tiger-troubleshooting and http://bugs.mysql.com/bug.php id=23201. If at first you don t succeed, look around the Web, as there s always a solution!

The mysql gem provides a class and a number of methods to Ruby so that you can connect to a preinstalled MySQL server. It does not include the MySQL server itself! If you don t have a MySQL server to connect to, you ll need to ask for details from your Web hosting provider or install a version of MySQL on your local machine.

Presenter view, described in detail in Appendix B on the companion CD, is a great asset to a presenter and provides helpful tools to remind you of what to say. Not only does the notes pane provide cues about what to say, but so do your headline and simple graphic, as well as the thumbnails of the slides below, which serve as visual summaries of the points to come.