REVOKE <privileges>
REVOKE <privileges> 语句用于删除已有用户的权限。执行 REVOKE <privileges> 语句需要拥有分配的权限，并且拥有 GRANT OPTION 权限。
语法图
- GrantStmt
- PrivElemList
- PrivElem
- PrivType
- ObjectType
- PrivLevel
- UserSpecList
GrantStmt ::=
'GRANT' PrivElemList 'ON' ObjectType PrivLevel 'TO' UserSpecList RequireClauseOpt WithGrantOptionOpt
PrivElemList ::=
PrivElem ( ',' PrivElem )*
PrivElem ::=
PrivType ( '(' ColumnNameList ')' )?
PrivType ::=
'ALL' 'PRIVILEGES'?
| 'ALTER' 'ROUTINE'?
| 'CREATE' ( 'USER' | 'TEMPORARY' 'TABLES' | 'VIEW' | 'ROLE' | 'ROUTINE' )?
| 'TRIGGER'
| 'DELETE'
| 'DROP' 'ROLE'?
| 'PROCESS'
| 'EXECUTE'
| 'INDEX'
| 'INSERT'
| 'SELECT'
| 'SUPER'
| 'SHOW' ( 'DATABASES' | 'VIEW' )
| 'UPDATE'
| 'GRANT' 'OPTION'
| 'REFERENCES'
| 'REPLICATION' ( 'SLAVE' | 'CLIENT' )
| 'USAGE'
| 'RELOAD'
| 'FILE'
| 'CONFIG'
| 'LOCK' 'TABLES'
| 'EVENT'
| 'SHUTDOWN'
ObjectType ::=
'TABLE'?
PrivLevel ::=
'*' ( '.' '*' )?
| Identifier ( '.' ( '*' | Identifier ) )?
UserSpecList ::=
UserSpec ( ',' UserSpec )*
示例
CREATE USER 'newuser' IDENTIFIED BY 'mypassword';
Query OK, 1 row affected (0.02 sec)
GRANT ALL ON test.* TO 'newuser';
Query OK, 0 rows affected (0.03 sec)
SHOW GRANTS FOR 'newuser';
+-------------------------------------------------+
| Grants for newuser@% |
+-------------------------------------------------+
| GRANT USAGE ON *.* TO 'newuser'@'%' |
| GRANT ALL PRIVILEGES ON test.* TO 'newuser'@'%' |
+-------------------------------------------------+
2 rows in set (0.00 sec)
REVOKE ALL ON test.* FROM 'newuser';
Query OK, 0 rows affected (0.03 sec)
SHOW GRANTS FOR 'newuser';
+-------------------------------------+
| Grants for newuser@% |
+-------------------------------------+
| GRANT USAGE ON *.* TO 'newuser'@'%' |
+-------------------------------------+
1 row in set (0.00 sec)
DROP USER 'newuser';
Query OK, 0 rows affected (0.14 sec)
SHOW GRANTS FOR 'newuser';
ERROR 1141 (42000): There is no such grant defined for user 'newuser' on host '%'
MySQL 兼容性
REVOKE <privileges> 语句执行成功后，在 TiDB 中语句执行的结果会在当前连接立即生效，而 MySQL 中部分权限的结果需要等到之后的连接才生效。见 TiDB #39356。