ruby sinatra activerecord

如果是用
require "sinatra"
require "active_record"

require 'mysql2'
用底下設定比較快
ActiveRecord::Base.configurations = YAML.load_file('database.yml')
ActiveRecord::Base.establish_connection('production')

用
require "sqlite3"
ActiveRecord::Base.establish_connection(
  :adapter => 'sqlite3',
  :database =>  'blog.db'
)

注意：database.yml 要像底下，關健字不一樣，就不能用

production:
  adapter: mysql2
  database:
  host: localhost
  username:
  password:
  encoding: utf8