select priv into @root_priv from mysql.global_priv where user='root' and host='localhost';
create role r1;
prepare stmt from "set password = '11111111111111111111111111111111111111111'";
execute stmt;
prepare stmt from "set default role r1";
execute stmt;
set password = '';
set default role NONE;
drop role r1;
update mysql.global_priv set priv=@root_priv where user='root' and host='localhost';