点击开始菜单，搜索cmd.exe，左击以管理员身份运行
操作之前先备份好数据库（切忌）
C:UsersAdministrator>cd C:Program FilesMySQLMySQL Server 5.7in C:Program FilesMySQLMySQL Server 5.7in>mysqld --skip-grants-tables //发现不成功，原因是没有data目录，于是在此C:Program FilesMySQLMySQL Server 5.7目录下创建了data目录，成功执行且可以跳过认证 //但是进入数据库发现原来的库都不见了，原来是默认情况下，MySQL的数据库文件是保存在C:/ProgramData/mysql/MySQL Server 5.7/Data/ 而且，Win7，Win10缺省是把C:/ProgramData目录隐藏的。 //因此我们需要指定配置文件来启动 C:Program FilesMySQLMySQL Server 5.7in>mysqld --defaults-file="C:ProgramDataMySQLMySQL Server 5.7my.ini" --user=mysql --skip-grants-tables
//进入数据库
C:Program FilesMySQLMySQL Server 5.7in>mysql Welcome to the MySQL monitor. Commands end with ; or g. Your MySQL connection id is 9 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>show databases; +--------------------+ | Database | +--------------------+ | information_schema | | ds_bi | | ixcrm | | karryofficial | | mysql | | performance_schema | | sanya | | sys | | zyyguahao | +--------------------+ 9 rows in set (0.00 sec) mysql> use mysql; Database changed mysql> show tables; +---------------------------+ | Tables_in_mysql | +---------------------------+ | columns_priv | | db | | engine_cost | | event | | func | | general_log | | gtid_executed | | help_category | | help_keyword | | help_relation | | help_topic | | innodb_index_stats | | innodb_table_stats | | ndb_binlog_index | | plugin | | proc | | procs_priv | | proxies_priv | | server_cost | | servers | | slave_master_info | | slave_relay_log_info | | slave_worker_info | | slow_log | | tables_priv | | time_zone | | time_zone_leap_second | | time_zone_name | | time_zone_transition | | time_zone_transition_type | | user | +---------------------------+ 31 rows in set (0.00 sec) 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 | | +------------------------+-----------------------------------+------+-----+-----------------------+-------+ 45 rows in set (0.00 sec) mysql> select user,host,authentication_string from user; +---------------+-----------+-------------------------------------------+ | user | host | authentication_string | +---------------+-----------+-------------------------------------------+ | root | localhost | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B | | mysql.session | localhost | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE | | mysql.sys | localhost | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE | | biyu | % | *EDC20FCB679DE26150946AA0D8FF74CE730128ED | +---------------+-----------+-------------------------------------------+ 4 rows in set (0.00 sec) mysql> update user set authentication_string=password('123456') where user='root' and host='localhost'; mysql> flush privileges; #更新权限 //退出再使用新密码登陆
方法二：
mysql > set password for root@localhost = password('mysqlroot');
方法三：
mysqladmin -u UserName -h Host password 'new_password' -p