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If you want to change the values in a row, you use the UPDATE statement. UPDATE is similar to INSERT, except that like SELECT, it can be modified (or constrained) by conditions. If you want to change the title for the Intro to SQL article, you can do so like this: sqlite> UPDATE articles SET title = 'Introduction to SQL' WHERE id = 9; Again, SQLite is silent, which means the command has been accepted. The fact that you use the primary key to find and update the row is significant. Although you can match any value in any column, the only surefire way to be sure you re updating the row you want is to use the primary key. You can confirm that the value was updated with another query: sqlite> SELECT title FROM articles WHERE id = 9; Introduction to SQL Sure enough, the title field has been updated.

Next, restart SciTE if it is already running, and then load or type out your Ruby code. Go to the Language menu and ensure that Ruby is selected. Then make sure the Output pane is showing in SciTE ( View Output ). Finally, ensure your code is saved, and then press the F5 function key to run your Ruby code. Alternatively you can use the menu ( Tools Go ). If running the example1.rb code gives a satisfactory output ( This application is running OK if 2 + 2 = 4, in this case) in the output view pane, you re ready to move on to the section Our Application: A Text Analyzer.

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Alternatively, you might prefer to run Ruby from the command prompt. To do this, load up the command prompt (go to Start Run, type cmd, and then click OK ), navigate to the folder containing example1.rb using the cd command, and then type c:\ruby\bin\ruby example1.rb. However, this method is only advised if you understand how to navigate your hard drive from the command prompt. Another option, if you re comfortable with creating shortcuts, is to create a shortcut to the Ruby executable file (ruby.exe) and drop your source code file(s) onto it.

my_car.make = 'Toyota'

The simplest method to run Ruby applications on Mac OS X is from Terminal, much in the same way as irb is run. Terminal was explained in 1. If you followed the preceding instructions, continue like so: 1. Launch Terminal (found in Applications/Utilities). 2. Use cd to navigate to the folder where you placed example1.rb, like so: cd ~/ruby. This tells Terminal to take you to the ruby folder located off of your home user folder. 3. Type ruby example1.rb and press Enter to execute the example1.rb Ruby script. 4. If you get an error such as ruby: No such file or directory -- example1.rb (LoadError), you aren t in the same folder as the example1.rb source file, and you need to establish where you have saved it. If you get a satisfactory response from example1.rb, you re ready to move on to the Our Application: A Text Analyzer section. Alternatively, if you re using TextMate, you can just press Cmd+R to run the Ruby script you re working on in a separate window. This is probably the easiest way to run a Ruby script while you re developing it, but since TextMate is a commercial product and it may not always be an option, it s essential to at least be familiar with how to run Ruby scripts from Terminal, too.

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