rails database.yml配置

 
development:
  adapter: mysql
  database: mybook
  host: localhost
  password: 
  pool: 5
  timeout: 5000

# 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: mybook
  host: localhost
  password: 
  pool: 5
  timeout: 5000
 
production:
  adapter: mysql
  database: mybook
  host: localhost
  password: 
  pool: 5
  timeout: 5000

冒号后需加空格，不如服务器起不来

安装mysql驱动，gem install mysql;

windows需拷贝mysql安装目录下的libmySQL.dll到windows\system32下。