Revoke all privileges for all users on a MySQL DB

From: http://dev.mysql.com/doc/refman/5.0/en/drop-database.html

...when a database is dropped, user privileges on the database are not automatically dropped.

So the question becomes, how do you revoke all privileges for all users on a MySQL DB? I imagine it's simpl开发者_如何学运维e, but I'm surprised I haven't been able to find this anywhere.

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REVOKE ALL PRIVILEGES ON *.* FROM '<user_name>'@'localhost';
REVOKE ALL PRIVILEGES ON *.* FROM '<user_name>'@'%';

Eg.:

REVOKE ALL PRIVILEGES ON *.* FROM 'jeffrey'@'localhost';
REVOKE ALL PRIVILEGES ON *.* FROM 'jeffrey'@'%';

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You can revoke all privileges for a specific user with this syntax:

REVOKE ALL PRIVILEGES, GRANT OPTION FROM user [, user] ...
FLUSH PRIVILEGES;

which drops all global, database, table, column, and routine privileges for the named user or users

Not sure if there's a way to do this for all users at once, though.

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REVOKE ALL PRIVILEGES FROM '%'@'%';

The above could be dangerous as i suppose it will delete all the privileges from all the users including root

Modify it to:

REVOKE ALL PRIVILEGES FROM 'user'@'localhost';

or

REVOKE ALL PRIVILEGES FROM 'user'@'%';

before execute

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I suppose you can do:

REVOKE ALL PRIVILEGES FROM '%'@'%';
FLUSH PRIVILEGES;

(Don't modify MySQL tables directly)