window下 mysql密码忘记

1.打开MySQL配置文件 my.ini中，添加上skip-grant-tables,可以添加到文件的末尾或者是这添加到[mysqld]的下面。

2.重启mysql

3.这时登录MySQL不再需要验证

切换到mysql系统库：
mysql> use mysql;

修改root账户登录密码：
mysql> update user set password=password('') where user='root';
ERROR 1054 (42S22): Unknown column 'password' in 'field list'
---报错没有password这个数据字段列

描述user表
mysql> desc user;
...
| authentication_string  | text                              | YES  |     | NULL                  |       |
| password_expired       | enum('N','Y')                     | NO   |     | N                     |       |
| password_last_changed  | timestamp                         | YES  |     | NULL                  |       |
| password_lifetime      | smallint(5) unsigned              | YES  |     | NULL                  |       |
| account_locked         | enum('N','Y')                     | NO   |     | N                     |       |
+------------------------+-----------------------------------+------+-----+-----------------------+-------+
---没发现password列，但是找到这5个跟密码相关的数据字段

查询一下相关的密码信息：
mysql> select user,host,authentication_string,password_expired from user;
+-----------+-----------+-------------------------------------------+------------------+
| user      | host      | authentication_string                     | password_expired |
+-----------+-----------+-------------------------------------------+------------------+
| root      | localhost | *9AA01F6E2A80A823ACB72CC07337E2911404B5B8 | Y                |
| mysql.sys | localhost | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE | N                |
+-----------+-----------+-------------------------------------------+------------------+
---到这里不难发现root账户的密码已过期，还比5.6多出了一个mysql.sys用户

修改密码
mysql> update user set authentication_string=password('123abc') where user='root';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

mysql> exit