解决mysql输入密码无法登录的问题

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
当我输入root登录输入密码就会出现这种错误，不输入密码就可以登录，不输入密码里面只有information_scheme和test两个库。
然后我使用安全登录，这里注意要先关闭mysql服务

#关闭mysql
[root@localhost bin]# systemctl stop mariadb
#安全模式启动
[root@localhost bin]# mysqld_safe --skip-grant-tables &
mysql

MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| test               |
+--------------------+
4 rows in set (0.00 sec)

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

#我这里localhost没有密码，必须要设置密码
MariaDB [mysql]> select Host,User,Password from user;
+-----------------------+------+-------------------------------------------+
| Host                  | User | Password                                  |
+-----------------------+------+-------------------------------------------+
| %                     | root | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
| localhost.localdomain | root |                                           |
| 127.0.0.1             | root |                                           |
| ::1                   | root |                                           |
| localhost             | root |                                           |
| localhost.localdomain |      |                                           |
+-----------------------+------+-------------------------------------------+
6 rows in set (0.01 sec)

MariaDB [mysql]> update user set Password='root' where Host='localhost';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

MariaDB [mysql]> select Host,User,Password from user;
+-----------------------+------+-------------------------------------------+
| Host                  | User | Password                                  |
+-----------------------+------+-------------------------------------------+
| %                     | root | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
| localhost.localdomain | root |                                           |
| 127.0.0.1             | root |                                           |
| ::1                   | root |                                           |
| localhost             | root | root                                      |
| localhost.localdomain |      |                                           |
+-----------------------+------+-------------------------------------------+
6 rows in set (0.00 sec)

弄完之后就可以使用root登录了