mysql用戶管理及受權

以mariadb5.5版本爲例

新建用戶

登陸mariadb

# mysql -uroot -p
Enter password: 
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 5
Server version: 5.5.52-MariaDB MariaDB Server
Copyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> 

//建立用戶
MariaDB [(none)]> insert into mysql.user(Host,User,Password) values("localhost","frank",password("frank"));
Query OK, 1 row affected, 4 warnings (0.00 sec)

//刷新系統權限表
MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.01 sec)

這樣就建立了一個名爲：frank 密碼爲：frank 的用戶。
而後登陸一下。
MariaDB [(none)]>exit;
# mysql -ufrank -p
Enter password: 
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 7
Server version: 5.5.52-MariaDB MariaDB Server
Copyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]>

爲用戶受權

首先以root登陸mariadb,建立一個數據庫phpdb

MariaDB [(none)]> create database phpdb;
Query OK, 1 row affected (0.00 sec)

受權frank用戶擁有phpdb庫的全部權限

MariaDB [(none)]> grant all privileges on phpdb.* to frank@localhost identified by 'frank';
Query OK, 0 rows affected (0.00 sec)

刷新系統權限表

MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.00 sec)

若是想指定部分權限給一用戶，能夠這樣來寫:

MariaDB [(none)]>grant select,update on phpdb.* to frank@localhost identified by 'frank';

刪除用戶

MariaDB [(none)]> delete from mysql.user where user="frank" and host="localhost";
Query OK, 1 row affected (0.00 sec)

MariaDB [(none)]> select user from mysql.user;
+------+
| user |
+------+
| root |
| root |
|      |
| root |
|      |
| root |
+------+

修改指定用戶密碼

MariaDB [(none)]>update mysql.user set password=password('frank') where User="root" and Host="localhost";
MariaDB [(none)]>flush privileges;