Dynamic connection to MySQL database in Ruby on Rails (mysql2)

gistfile1.rb

require 'mysql2'
 
    db = Mysql2::Client.new(:host => 'localhost', :username => 'root', :password=> 'password', :database => 'db_name'   )
 
    res = db.query("select * from users")
    res.each do |row|
      col1 = row['id']
      col2 = row['email']
 
      ..
    end