注：必须使用root用户
dbname：数据库名称
root：用户名
passwd：密码
grant all privileges on dbname.* to root@'localhost' identified by 'passwd';
grant all privileges on dbname.* to root@'127.0.0.1' identified by 'passwd';
grant all privileges on dbname.* to root@'%' identified by 'passwd';
grant all privileges on dbname.* to root@'127.0.0.1' identified by 'passwd';
grant all privileges on dbname.* to root@'%' identified by 'passwd';