#!/usr/bin/ruby

require 'mysql'

begin
    con = Mysql.new 'localhost', 'user12', '34klq*'

    con.list_dbs.each do |db|
        puts db
    end

rescue Mysql::Error => e
    puts e.errno
    puts e.error

ensure
    con.close if con
end


## Command Line
ubuntu@ip-10-252-56-122:~$ ruby test_db_connect.rb
information_schema
golf
test_db_connect.rb:13:in `<main>': undefined local variable or method `e' for main:Object (NameError)
ubuntu@ip-10-252-56-122:~$