MySQL账号权限

mysql权限分为全局权限、库权限、表权限，对应于mysql库里面的user表、db表、tables_priv表。

grant all privileges on *.*  :操作mysql.user表

grant all privileges on db.*  :操作mysql.db表

grant all privileges on db.table :操作mysql.tables_priv表

这三种操作分别对应不同的表，互不影响，赋予一个用户大粒度的权限，并不能收回小粒度的权限。

示例如下：

[email protected]:mysql3306.sock  14:02:  [test]>grant all privileges on *.* to [email protected]‘127.0.0.1‘;

Query OK, 0 rows affected (0.00 sec)

[email protected]:mysql3306.sock  14:03:  [test]>revoke update on test.* from  [email protected]‘127.0.0.1‘;

ERROR 1141 (42000): There is no such grant defined for user ‘test‘ on host ‘127.0.0.1‘

[email protected]:mysql3306.sock  14:03:  [test]>revoke update on test.a from  [email protected]‘127.0.0.1‘;

ERROR 1147 (42000): There is no such grant defined for user ‘test‘ on host ‘127.0.0.1‘ on table ‘a‘