require 'uri'
class URI::MySQL < URI::Generic; end

URI.scheme_list["MYSQL"] = URI::MySQL

uri = URI.parse("mysql://u-kondo:XXXXX@localhost:3306/hogege")
uri.class
#=> URI::MySQL
uri.host
#=> localhost

require 'uri'
require 'active_record'
 
class URI::MySQL < URI::Generic
  def default_port
    3306
  end
 
  def database
    path[1..-1] rescue nil
  end
 
  def connection_hash
    {
      :adapter  => scheme,
      :host     => host,
      :username => user,
      :password => password,
      :database => database,
      :encoding => 'utf8',
      :port     => port
    }
  end
end
URI.scheme_list["MYSQL"] = URI::MySQL
 
uri = URI.parse("mysql://u-kondo:XXXXX@localhost/hogege")
ActiveRecord::Base.establish_connection(uri.connection_hash)