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';?