reset!

# File activerecord/lib/active_record/connection_adapters/mysql_adapter.rb, line 290
      def reset!
        if @connection.respond_to?(:change_user)
          # See http://bugs.mysql.com/bug.php?id=33540 -- the workaround way to
          # reset the connection is to change the user to the same user.
          @connection.change_user(@config[:username], @config[:password], @config[:database])
          configure_connection
        end
      end