Introduction to knowledge related to Mysql user management

Currently used user and host:

mysql> select USER();
+----------------+
| USER()         |
+----------------+
| root@localhost |
+----------------+
1 row in set (0.00 sec)

Add user

Previous versions of mysql5 directly used INSERT to insert mysql users into the mysql table. This operation cannot be done after mysql5

mysql> insert into mysql.user(Host,User,Password) values('localhost','test_user',password('123123'));
ERROR 1062 (23000): Duplicate entry 'localhost-test_user' for key 'PRIMARY'

Add a user {Grant the user the permission to specify the data table [Use the GRANT command to authorize the user accordingly]}

mysql> GRANT all privileges ON table1.* TO 
'test_user'@'localhost' IDENTIFIED BY '123123' WITH GRANT OPTION;
Query OK, 0 rows affected (0.02 sec)

IDENTIFIED BY Specify the user's login password

ALL PRIVILEGES means all permissions, You can also use select, update and other permissions

*.\ The first * sign is used to specify the database name, and the following * sign is used to specify the table name

TO means granting permissions to a certain User

ON is used to specify which libraries and tables the permissions are for

'test_user'@'localhost' represents the test_user user, @ is followed by the restricted host, which can be IP, IP segment, domain name and %, % means anywhere

WITH GRANT OPTION This option means that the user can authorize his own permissions to others

Need to refresh the system permission table [flush privilege] Only this user can log in effectively

mysql> flush privileges;

Delete user

mysql> drop user 'test_user'@'localhost';

View the permissions of the current user

mysql> SHOW GRANTS;
+----------------------------------------------------------------------------------------------------------------------------------------+
| Grants for root@localhost                                                                                                              |
+----------------------------------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY PASSWORD '\*E56A114692FE0DE073F9A1DD68A00EEB9703F3F1' WITH GRANT OPTION |
| GRANT PROXY ON ''@'' TO 'root'@'localhost' WITH GRANT OPTION                                                                           |
+----------------------------------------------------------------------------------------------------------------------------------------+

View the permissions of a user

mysql> show grants for 'test_user'@'localhost'
+------------------------------------------------------------------------------------------------------------+
| Grants for test_user@localhost                                                                                   |
+------------------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'test_user'@'localhost' IDENTIFIED BY PASSWORD '\*E56A114692FE0DE073F9A1DD68A00EEB9703F3F1' |
| GRANT ALL PRIVILEGES ON table1.* TO 'test_user'@'localhost' WITH GRANT OPTION                                 |
+------------------------------------------------------------------------------------------------------------+

Rename the account

mysql> rename user 'test_user'@'localhost' to 'bb'@'localhost';

Change password

1. Use the set password command

mysql> SET PASSWORD FOR 'test_user'@'localhost' = PASSWORD('123456');

2. Use mysqladmin [enter the bin directory]

Remarks: {Format: mysqladmin - uUsername -p old password password new password]

/usr/bin$ mysqladmin -utest_user -p123456 password 123123
mysqladmin: Can't turn off logging; error: 'Access denied; you need (at least one of) the SUPER privilege(s) for this operation'

3. Use update to directly edit the user table

mysql> use mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> update user set PASSWORD = PASSWORD('123123') where user = 'test_user';
Query OK, 1 row affected (0.04 sec)
Rows matched: 1  Changed: 1  Warnings: 0

Recommended tutorial: "MySQL Tutorial"

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