Using ActiveRecord without Rails

active_record_sample.rb

require 'rubygems'
require 'active_record'

ActiveRecord::Base.establish_connection(
  :pool     => 5,
  :adapter  => "mysql",
  :host     => "xxx.xxx.xxx.xxx",
  :username => "db_user",
  :password => "db_pass",
  :database => "db_name",
  :encoding => "utf8"
) 

class ModelName < ActiveRecord::Base
  set_primary_key  "xxx_id"
  set_table_name   "xxx_table"
end