MySQL 5.7.21更改root用户密码

今天将小站上面的MySQL版本升级到了最新的5.7.21，然后在更改root用户密码的时候遇到了问题，mysql环境下使用的更改root密码的语句为： [code]update user set password=password("********") where user='root';[/code] 回车然后报错内容如下： [code]ERROR 1054 (42S22): Unknown column 'password' in 'field list'[/code] 于是我查询资料，得出错误的原因是5.7以后的版本中mysql数据库下已经没有password这个字段了，password字段改成了authentication_string，于是按照下面的代码尝试了一下： [code]>mysql -u root -p Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 102 Server version: 5.7.21-log MySQL Community Server (GPL) Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> use mysql; Database changed mysql> update mysql.user set authentication_string=password('********') where user='root'; Query OK, 1 row affected, 1 warning (0.00 sec) Rows matched: 1 Changed: 1 Warnings: 1 mysql> flush privileges; Query OK, 0 rows affected (0.00 sec) mysql> quit Bye >mysql -u root -p Enter password: ******** #输入新密码[/code] 新密码登陆成功 -_<