如题所述，mysql5.7 mysql库下面的user表没有password字段无法修改密码，
5.7版本已经不再使用password来作为密码的字段了 而改成了authentication_string
登陆密码记不起：
[root@master1 ~]# mysql -uroot -pEnter password: ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
更改配置
vi /etc/my.cnf#在mysqld模块下添加skip-grant-tables
重启服务
systemctl restart mysqld
按照传统改密码方式发现没有 password这个字段。
mysql> update user set password=password('123') where user='root';ERROR 1054 (42S22): Unknown column 'password' in 'field list' 查询user表结构
mysql> desc user;+------------------------+-----------------------------------+------+-----+-----------------------+-------+| Field | Type | Null | Key | Default | Extra |+------------------------+-----------------------------------+------+-----+-----------------------+-------+| Host | char(60) | NO | PRI | | || User | char(32) | NO | PRI | | || Select_priv | enum('N','Y') | NO | | N | || Insert_priv | enum('N','Y') | NO | | N | || Update_priv | enum('N','Y') | NO | | N | || Delete_priv | enum('N','Y') | NO | | N | || Create_priv | enum('N','Y') | NO | | N | || Drop_priv | enum('N','Y') | NO | | N | || Reload_priv | enum('N','Y') | NO | | N | || Shutdown_priv | enum('N','Y') | NO | | N | || Process_priv | enum('N','Y') | NO | | N | || File_priv | enum('N','Y') | NO | | N | || Grant_priv | enum('N','Y') | NO | | N | || References_priv | enum('N','Y') | NO | | N | || Index_priv | enum('N','Y') | NO | | N | || Alter_priv | enum('N','Y') | NO | | N | || Show_db_priv | enum('N','Y') | NO | | N | || Super_priv | enum('N','Y') | NO | | N | || Create_tmp_table_priv | enum('N','Y') | NO | | N | || Lock_tables_priv | enum('N','Y') | NO | | N | || Execute_priv | enum('N','Y') | NO | | N | || Repl_slave_priv | enum('N','Y') | NO | | N | || Repl_client_priv | enum('N','Y') | NO | | N | || Create_view_priv | enum('N','Y') | NO | | N | || Show_view_priv | enum('N','Y') | NO | | N | || Create_routine_priv | enum('N','Y') | NO | | N | || Alter_routine_priv | enum('N','Y') | NO | | N | || Create_user_priv | enum('N','Y') | NO | | N | || Event_priv | enum('N','Y') | NO | | N | || Trigger_priv | enum('N','Y') | NO | | N | || Create_tablespace_priv | enum('N','Y') | NO | | N | || ssl_type | enum('','ANY','X509','SPECIFIED') | NO | | | || ssl_cipher | blob | NO | | NULL | || x509_issuer | blob | NO | | NULL | || x509_subject | blob | NO | | NULL | || max_questions | int(11) unsigned | NO | | 0 | || max_updates | int(11) unsigned | NO | | 0 | || max_connections | int(11) unsigned | NO | | 0 | || max_user_connections | int(11) unsigned | NO | | 0 | || plugin | char(64) | NO | | mysql_native_password | || 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 | |+------------------------+-----------------------------------+------+-----+-----------------------+-------+ 网上查了一下据说5.7 版本password 字段改成authentication_string password函数还是原来的password函数
mysql> update user set authentication_string=password('123') where user='root';Query OK, 1 row affected, 1 warning (0.00 sec)Rows matched: 1 Changed: 1 Warnings: 1
#更改配置重启mysql 成功登陆
[root@master1 ~]# vi /etc/my.cnf 注释 # skip-grant-tables[root@master1 ~]# systemctl restart mysqld[root@master1 ~]# mysql -uroot -p123mysql: [Warning] Using a password on the command line interface can be insecure.Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 2Server version: 5.7.21-logCopyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql>