mysql_read_timeout.rb

require 'rubygems'
require 'active_record'

ActiveRecord::Base.establish_connection('host' => 'localhost',
                                        'user' => 'root',
                                        'adapter' => 'mysql2',
                                        'read_timeout' => 1)
begin
  result = ActiveRecord::Base.connection.execute('select sleep(2)')
  result.each { |r| p r }
rescue ActiveRecord::StatementInvalid
  ActiveRecord::Base.establish_connection('host' => 'localhost',
                                          'user' => 'root',
                                          'adapter' => 'mysql2')
  result = ActiveRecord::Base.connection.execute('select sleep(2)')
  result.each { |r| p r }
end