dbconfig = YAML::load(File.open('config/database.yml'))
ActiveRecord::Base.establish_connection( dbconfig['production'] )

client = Mysql2::Client.new(dbconfig['production'])

client = Mysql2::Client.new(:host => "localhost", :username => "user", :password => 'password', :database => 'db', :socket => '/tmp/mysql.sock')

client = Mysql2::Client.new(:host => dbconfig['hostname'], :username => dbconfig['username'], :password => dbconfig['password'], :database => dbconfig['database'], :socket => '/tmp/mysql.sock')

config = YAML::load_file("config/database.yml")["development"]
config["host"] = config["hostname"]

client = Mysql2::Client.new(config)