MySQL5.7 添加用戶、刪除用戶與授權

mysql -uroot -proot

MySQL5.7 mysql.user表沒有password字段改?authentication_string；

一. 創建用戶:

命令:CREATE USER?'username'@'host' IDENTIFIED BY 'password';

例子: CREATE USER?'dog'@'localhost' IDENTIFIED BY '123456';

? ? ? ? CREATE USER 'dog2'@'localhost' IDENTIFIED BY '';

PS：username - 你將創建的用戶名,

host - 指定該用戶在哪個主機上可以登陸，此處的"localhost"，是指該用戶只能在本地登錄，不能在另外一臺機器上遠程登錄，如果想遠程登錄的話，將"localhost"改為"%"，表示在任何一臺電腦上都可以登錄;也可以指定某臺機器可以遠程登錄;

password - 該用戶的登陸密碼,密碼可以為空,如果為空則該用戶可以不需要密碼登陸服務器。

二.授權:

命令:GRANT privileges?ON databasename.tablename?TO?'username'@'host'

PS: privileges - 用戶的操作權限,如SELECT , INSERT , UPDATE?等(詳細列表見該文最后面).如果要授予所的權限則使用ALL.;databasename - 數據庫名,tablename-表名,如果要授予該用戶對所有數據庫和表的相應操作權限則可用*表示, 如*.*.

例子: GRANT SELECT, INSERT ON mq.* TO?'dog'@'localhost';

三.創建用戶同時授權

mysql> grant all privileges on mq.* to test@localhost identified by '1234';
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql>?flush privileges;
Query OK, 0 rows affected (0.01 sec)

PS:必須執行flush privileges;?

否則登錄時提示：ERROR 1045 (28000): Access denied for user 'user'@'localhost' (using password: YES )?

?

四.設置與更改用戶密碼

命令:SET PASSWORD FOR?'username'@'host'?= PASSWORD('newpassword');

例子: SET PASSWORD FOR?'dog2'@'localhost'?= PASSWORD("dog");

五.撤銷用戶權限

????? 命令: REVOKE privilege ON databasename.tablename FROM?'username'@'host';

???? 說明: privilege, databasename, tablename - 同授權部分.

????? 例子: REVOKE SELECT ON mq.* FROM?'dog2'@'localhost';

PS: 假如你在給用戶'dog'@'localhost''授權的時候是這樣的(或類似的):GRANT SELECT ON?test.user?TO?'dog'@'localhost', 則在使用REVOKE SELECT ON?*.*?FROM?'dog'@'localhost';命令并不能撤銷該用戶對test數據庫中user表的SELECT 操作.相反,如果授權使用的是GRANT SELECT ON *.* TO?'dog'@'localhost';則REVOKE SELECT ON test.user FROM?'dog'@'localhost';命令也不能撤銷該用戶對test數據庫中user表的Select 權限.

????? 具體信息可以用命令SHOW GRANTS FOR?'dog'@'localhost'; 查看.

六.刪除用戶

????? 命令:?DROP USER?'username'@'host';

七.查看用戶的授權

mysql> show grants for dog@localhost;
+---------------------------------------------+
| Grants for dog@localhost |
+---------------------------------------------+
| GRANT USAGE ON *.* TO 'dog'@'localhost' |
| GRANT INSERT ON `mq`.* TO 'dog'@'localhost' |
+---------------------------------------------+
2 rows in set (0.00 sec)

PS:GRANT USAGE:mysql usage權限就是空權限，默認create user的權限，只能連庫，啥也不能干

ps 之前收集了很多mysql 的命令，結果今天在mysql 5.7中失效了，因此在整理一下

mysql> CREATE USER 'root'@'192.168.1.17' IDENTIFIED BY 'root';
Query OK, 0 rows affected (0.00 sec)

創建用戶

mysql> CREATE USER 'root'@'%' IDENTIFIED BY 'root';
Query OK, 0 rows affected (0.00 sec)

root 用戶可以在任何機器上登錄，且擁有任何表的任何權限

mysql> grant all privileges on *.* to root@'%' identified by 'root';
Query OK, 0 rows affected, 1 warning (0.00 sec)

-----------------------------------------======================================================================

mysql>?set?global?validate_password_policy=0;??

Query?OK,?0?rows?affected?(0.05?sec)??

??

mysql>???

mysql>???

mysql>?set?global?validate_password_mixed_case_count=0;??

Query?OK,?0?rows?affected?(0.00?sec)??

??

mysql>?set?global?validate_password_number_count=3;??

Query?OK,?0?rows?affected?(0.00?sec)??

??

mysql>?set?global?validate_password_special_char_count=0;??

Query?OK,?0?rows?affected?(0.00?sec)??

??

mysql>?set?global?validate_password_length=3;??

Query?OK,?0?rows?affected?(0.00?sec)??

??

mysql>?SHOW?VARIABLES?LIKE?'validate_password%';??

+--------------------------------------+-------+??

|?Variable_name????????????????????????|?Value?|??

+--------------------------------------+-------+??

|?validate_password_dictionary_file????|???????|??

|?validate_password_length?????????????|?3?????|??

|?validate_password_mixed_case_count???|?0?????|??

|?validate_password_number_count???????|?3?????|??

|?validate_password_policy?????????????|?LOW???|??

|?validate_password_special_char_count?|?0?????|??

+--------------------------------------+-------+??

6?rows?in?set?(0.00?sec)??

?

FLUSH?PRIVILEGES;

?

?

4）修改簡單密碼：

?

[sql]?view plaincopy

mysql>?SET?PASSWORD?FOR?'root'@'localhost'?=?PASSWORD('123');??

Query?OK,?0?rows?affected,?1?warning?(0.00?sec)??

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