MySQL跳过密码登录并修改用户密码

1、跳过密码登录:
MySQL配置文件/etc/my.cnf中,在[mysqld]下添加skip-grant-tables,关闭 MySQL服务并重新开启;
输入命令:mysql -u root -p
回车后,要求输入密码,直接回车跳过,则直接进入MySQL。
2、网上搜到的命令为如下
mysql> update user set password=password(“新密码”) where user=”用户名”;
执行后报错  ERROR 1054(42S22) Unknown column ‘password’ in ‘field list’

错误的原因是 5.7版本下的mysql数据库下已经没有password这个字段了,password字段改成了authentication_string

所以请使用一下命令:

mysql> use mysql;
Database changed
mysql> select User from user; #此处为查询用户命令
±----------+
| User |
±----------+
| ******* |
| mysql.sys |
| root |
±----------+
3 rows in set (0.00 sec)

mysql> update user set password=password(“") where user="”; #修改密码报错
ERROR 1054 (42S22): Unknown column ‘password’ in ‘field list’
mysql> update mysql.user set authentication_string=password(‘’) where user='’; #修改密码成功
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 1

mysql> flush privileges; #立即生效
Query OK, 0 rows affected (0.00 sec)

mysql> quit
Bye

n>mysql -u ******* -p #以该用户登录成功.
Enter password: ********
…………………………
mysql>

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