mysql报错：Error Code: 1044. Access denied for user 'root'@'%' to database

root用户新建了一个数据库，赋权限给用户A，mysql

grant 权限 on 数据库.数据表 to '用户' @ '主机名';

grant all on db_test.* to 'test'@'%';

报错以下：web

[Err] 1044 - Access denied for user 'root'@'%' to database 'db_test'

报错能够看出root没有权限，查询用户表看root用户权限sql

SELECT host,user,Grant_priv,Super_priv FROM mysql.user;

修改权限，执行以下：数据库

UPDATE mysql.user SET Grant_priv='Y', Super_priv='Y' WHERE User='root';
FLUSH PRIVILEGES;