rails/railties/configs/databases/mysql.yml

# 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:
#   gem install mysql
#       Choose the win32 build.
#       Install MySQL and put its /bin directory on your path.
#
# 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: <%= app_name %>_development
  username: root
  password:
<% if socket -%>
  socket: <%= socket %>
<% else -%>
  host: localhost
<% end -%>

# Warning: The database defined as 'test' will be erased and
# re-generated from your development database when you run 'rake'.
# Do not set this db to the same as development or production.
test:
  adapter: mysql
  database: <%= app_name %>_test
  username: root
  password:
<% if socket -%>
  socket: <%= socket %>
<% else -%>
  host: localhost
<% end -%>

production:
  adapter: mysql
  database: <%= app_name %>_production
  username: root
  password: 
<% if socket -%>
  socket: <%= socket %>
<% else -%>
  host: localhost
<% end -%>