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Of course, not all information in a database will stay there forever. Sometimes you need to delete records, such as when a product goes out of stock or a user cancels their account. That s the purpose of the DELETE statement. It works a lot like the UPDATE statement, in that it accepts conditions and deletes the rows for any records that match the conditions. If you want to delete the article with the id of 9, the DELETE statement is as follows: sqlite> DELETE FROM articles WHERE id = 9; SQLite receives the command and deletes the record identified by the id you specified. And, of course, if you subsequently search for the record, youexists: sqlite> SELECT * FROM articles WHERE id = 9;

This sets the value of the make attribute for our car to Toyota. If we had other Car objects, their makes would remain unchanged. We re setting the attribute only on the my_car object. Now when we use the reader method, it confirms that the make attribute has been updated.

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In Linux or other UNIX-based systems, you run your Ruby applications from the shell (that is, within a terminal window) in the same way that you ran irb. The process to run irb was explained in 1, so if you ve forgotten how to get that far, you need to recap yourself before continuing like so: 1. Launch your terminal emulator (such as xterm or, on Ubuntu, simply Terminal ) so you get a Linux shell/command prompt. 2. Navigate to the directory where you placed example1.rb using the cd command (for example, cd ~/ruby takes you to the ruby directory located directly under your home directory, usually /home/<your username>/). 3. Type ruby example1.rb and press Enter to make Ruby execute the example1.rb script. If you get a satisfactory response from example1.rb, you re ready to move on.

Source code is basically the same as plain text, and although you can write your code in a general text editor, some developers prefer to use a specialist source code editor (typically known as an IDE). RadRails and Ruby In Steel are examples of IDEs specifically created for Ruby developers. They allow you to edit text, as with any other text editor, but both offer extended features such as source code syntax coloring and the ability to run code directly from the editor. TextMate for OS X looks like a regular text editor, but also offers some IDE-like functionality, including source code syntax coloring. Some developers find source code syntax coloring an invaluable feature, as it makes their code easier to read. Variable names, expressions, string literals, and other elements of your source code are all given different colors, which makes it easy to pick them out. Whether you choose an IDE or a basic text editor depends on your own preference, but it s worth trying both. Many developers prefer the freedom of a regular text editor and then running their Ruby programs from the command line, whereas others prefer to work entirely within a single environment. This book will not assume, however, that are you using an IDE, so you may have a separate learning curve for picking up the IDE s functions as well as Ruby s in general. RadRails, an open source, cross-platform Ruby and Rails IDE, is available at http://www.radrails. org/. Ruby In Steel, a Windows-only Ruby IDE, is available at http://www.sapphiresteel.com/. It s certainly worth investigating these other editors in case they fit in more with how you wish to work.

my_car.make #=> 'Toyota'

CAUTION When you use either the UPDATE or DELETE command, you re making changes to existing data; so, be careful to use a WHERE clause to limit the records you re updating or deleting. A good practice is to always run a SELECT command first to make sure your query returns the records you re expecting; then, later run the UPDATE or DELETE command.

The application you re going to develop in this chapter will be a text analyzer. Your Ruby code will read in text supplied in a separate file, analyze it for various patterns and statistics, and print out the results for the user. It s not a 3D graphical adventure or a fancy web site, but text processing programs are the bread and butter of systems administration and most application development. They can be vital for parsing log files and user-submitted text on web sites, and manipulating other textual data. Ruby is well suited for text and document analysis with its regular expression features, along with the ease of use of scan and split, and you ll be using these heavily in your application.

my_car.make = 'Mazda'

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