登陆数据库，进入mysql数据库：
MariaDB [(none)]> 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
MariaDB [mysql]>
查看mysql数据库中user表：
MariaDB [mysql]> select user,host,password from user;
+------+-----------+-------------------------------------------+
| user | host | password |
+------+-----------+-------------------------------------------+
| root | localhost | *E56A114692FE0DE073F9A1DD68A00EEB9703F3F1 |
+------+-----------+-------------------------------------------+
1 row in set (0.00 sec)
更新user表中用户root对应的password字段：
MariaDB [mysql]> update user set password=password(\'123123\') where user=\'root\';
Query OK, 0 rows affected (0.02 sec)
Rows matched: 1 Changed: 0 Warnings: 0
MariaDB [mysql]> select user,host,password from user;
+------+-----------+-------------------------------------------+
| user | host | password |
+------+-----------+-------------------------------------------+
| root | localhost | *E56A114692FE0DE073F9A1DD68A00EEB9703F3F1 |
+------+-----------+-------------------------------------------+
1 row in set (0.00 sec)
刷新权限：
MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.00 sec)
MariaDB [mysql]>