Mysql的用户基本操作
创建用户：
mysql> create user 'cai'@'localhost' identified by '123456';
Query OK, 0 rows affected (0.00 sec)
mysql> select user,host from mysql.user;
+---------------+-----------+
| user | host |
+---------------+-----------+
| cai | localhost |
| mysql.session | localhost |
| mysql.sys | localhost |
| root | localhost |
| wordpress | localhost |
+---------------+-----------+
5 rows in set (0.00 sec)[root@cairui ~]# mysql -ucai -p123456
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 275
Server version: 5.7.21-debug Source distribution
Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.授权：
命令：GRANT privileges ON databasename.tablename TO 'username'@'host'
mysql> grant select,delete,create,insert,update on aa.* to 'cai'@'localhost';
Query OK, 0 rows affected (0.00 sec)
mysql> show grants for cai@localhost;
+-----------------------------------------------------------------------------+
| Grants for cai@localhost |
+-----------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'cai'@'localhost' |
| GRANT SELECT, INSERT, UPDATE, DELETE, CREATE ON `aa`.* TO 'cai'@'localhost' |
+-----------------------------------------------------------------------------+
2 rows in set (0.00 sec)撤销用户权限：
命令：REVOKE privilege ON databasename.tablename FROM 'username'@'host';
mysql> show grants for cai@localhost;
+-----------------------------------------------------------------------------+
| Grants for cai@localhost |
+-----------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'cai'@'localhost' |
| GRANT SELECT, INSERT, UPDATE, DELETE, CREATE ON `aa`.* TO 'cai'@'localhost' |
+-----------------------------------------------------------------------------+
2 rows in set (0.00 sec)
mysql> revoke insert on aa.* from 'cai'@'localhost';
Query OK, 0 rows affected (0.00 sec)
mysql> show grants for cai@localhost;
+---------------------------------------------------------------------+
| Grants for cai@localhost |
+---------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'cai'@'localhost' |
| GRANT SELECT, UPDATE, DELETE, CREATE ON `aa`.* TO 'cai'@'localhost' |
+---------------------------------------------------------------------+
2 rows in set (0.00 sec) 设置与修改用户密码：
方法一：
[root@cairui ~]# mysqladmin -ucai -p'123456' password '123'
mysqladmin: [Warning] Using a password on the command line interface can be insecure.
Warning: Since password will be sent to server in plain text, use ssl connection to ensure password safety.
[root@cairui ~]# mysql -ucai -p123
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 279
Server version: 5.7.21-debug Source distribution
Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.方法二：
mysql> update mysql.user set authentication_string=password('cai') where user='cai' ;
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 1
mysql> flush privileges;
[root@cairui ~]# mysql -ucai -pcai;
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 284
Server version: 5.7.21-debug Source distribution
Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.方法三：
mysql> set password=password('root');
Query OK, 0 rows affected, 1 warning (0.00 sec)
[root@cairui ~]# mysql -uroot -proot
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 288
Server version: 5.7.21-debug Source distribution
Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> 忘记密码情况下的登录：
[root@cairui mysql]# bin/mysqld_safe --skip-grant-tables &
#登录时不需要密码，进入可修改密码删除用户：
mysql> select user,host from mysql.user;
+---------------+-----------+
| user | host |
+---------------+-----------+
| cai | localhost |
| mysql.session | localhost |
| mysql.sys | localhost |
| root | localhost |
| wordpress | localhost |
+---------------+-----------+
5 rows in set (0.00 sec)
mysql> drop user 'cai'@'localhost';
Query OK, 0 rows affected (0.00 sec)
mysql> select user,host from mysql.user;
+---------------+-----------+
| user | host |
+---------------+-----------+
| mysql.session | localhost |
| mysql.sys | localhost |
| root | localhost |
| wordpress | localhost |
+---------------+-----------+
4 rows in set (0.00 sec)本文参与 腾讯云自媒体同步曝光计划，分享自作者个人站点/博客。
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