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~/rails/mydiary $ mysql -u root -p Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 10 to server version: 5.0.27-standard Type 'help;' or '\h' for help. Type '\c' to clear the buffer. mysql> CREATE DATABASE mydiary; Query OK, 1 row affected (0.08 sec) mysql> GRANT ALL PRIVILEGES ON mydiary.* TO mydiary@localhost IDENTIFIED BY 'mypassword'; Query OK, 0 rows affected (0.30 sec) mysql> QUIT Bye

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In this session you create a database called mydiary and then grant all the privileges to use that database to a user called mydiary with a password of mypassword. You can check

FIGURE 2-15 The conventional PowerPoint approach does not incorporate the dual-channels concept and

that the database and the user was created successfully by using the MySQL command line client to access the mydiary database:

~/rails/mydiary $ mysql -u mydiary -p Enter password: <type mypassword at this point> Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 12 to server version: 5.0.27-standard Type 'help;' or '\h' for help. Type '\c' to clear the buffer. mysql> QUIT Bye

When you do not align your PowerPoint approach with the dual-channels concept, you impair learning in a number of ways. For example, ignoring the off-screen text box creates a scarcity of resources in the slide area, which predictably produces overloaded slides. Words will usually take priority over visuals, so you will tend to see slides lled with text. Visuals added to these already crowded slides will usually shrink to the size of postage stamps so that they can be squeezed between the boxes of text. These dynamics produce slides that are overly complex and dif cult to understand. During a presentation, as the audience tries to make sense of the overloaded slide, they are not paying attention to the speaker. When they do shift attention to the speaker, they soon look back at the slide and work hard to try to synchronize the two sources of information. Researchers call this the split-attention effect, which creates excess cognitive load and reduces the effectiveness of learning. You can observe similar dynamics when

You ve learned a lot about creating your own objects and how useful that can be. Before diving headlong into the magic of Python s special methods ( 9), let s take a breather with a little chapter about exception handling.

If MySQL gives no error, generally everything is okay. If you get an error saying that the username is invalid, then the granting of privileges in the prior section wasn t successful, so refer to any error messages that appeared at that point. If you re using a GUI MySQL client or even a client for a totally different database system, make sure that you ve created a database called mydiary and made it accessible to a user. Your client should allow you to test this easily. Once the database has been created, you can tell your Rails application of its existence by editing the config/database.yml file. Here s what it contains by default for your empty application:

# MySQL (default setup). Versions 4.1 and 5.0 are recommended. # # Install the MySQL driver: # gem install mysql # On MacOS X: # gem install mysql -- --include=/usr/local/lib # On Windows: # There is no gem for Windows. Install mysql.so from RubyForApache. # http://rubyforge.org/projects/rubyforapache # # And be sure to use new-style password hashing: # http://dev.mysql.com/doc/refman/5.0/en/old-client.html development: adapter: mysql database: mydiary_development username: root password: host: localhost # Warning: The database defined as 'test' will be erased and

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# regenerated from your development database when you run 'rake'. # Do not set this db to the same as development or production. test: adapter: mysql database: mydiary_test username: root password: host: localhost production: adapter: mysql database: mydiary_production username: root password: host: localhost