MySQL8.0怎么正确修改密码

MySQL8.0怎么正确修改密码

前言

mysql 更新完密码，总是拒绝连接、登录失败?MySQL8.0 不能通过直接修改 mysql.user 表来更改密码。正确更改密码的方式备注: 清空root密码

MySQL8.0 不能通过直接修改 mysql.user 表来更改密码。

因为authentication_string字段下只能是MySQL加密后的43位字符串密码，其他的导致错误。错误不报出，但是无法再登录mysql，总是会提示 无法认证。

参考：MySQL8.0

mysql> USE mysql;Database changedmysql> UPDATE user SET authentication_string="123456" WHERE user="root";Query OK, 1 row affected (0.39 sec)Rows matched: 1 Changed: 1 Warnings: 0mysql> FLUSH privileges; # 刷新保存Query OK, 0 rows affected (0.13 sec)登录后复制

mysql 5.7.9 之后取消了password 函数，authentication_string=password("123456") 会报错

C:\WINDOWS\system32>mysql -u root -pEnter password: ******ERROR 1045 (28000): Access denied for user ‘root’@‘localhost’ (using password: YES)1234567891011121314

如果 你已经这样更改密码，并且导致了无法进入mysql。本人表示同情之时，还为了你提供了详细的解决方案。请查看本文备注：清空root 密码

正确更改密码的方式

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY "your_password";mysql> USE mysql;Database changedmysql> ALTER USER 'root'@'localhost' IDENTIFIEED WITH mysql_native_password BY "markjun";ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'IDENTIFIEED WITH mysql_native_password BY "markjun"' at line 1mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY "markjun";Query OK, 0 rows affected (0.18 sec)mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY "123456";Query OK, 0 rows affected (0.08 sec)mysql> SELECT user, authentication_string FROM user;+------------------+------------------------------------------------------------------------+| user | authentication_string |+------------------+------------------------------------------------------------------------+| mysql.infoschema | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED || mysql.session | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED || mysql.sys | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED || root | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |+------------------+------------------------------------------------------------------------+4 rows in set (0.00 sec)mysql> FLUSH privileges;Query OK, 0 rows affected (0.38 sec)mysql> quit;ByeF:\MySQL\mysql-8.0.13-winx64\bin>mysql -u root -pEnter password: *******...mysql>登录后复制

备注: 清空root密码

停止 MySQL 任务 net stop MySQL

mysqld 命令 mysqld --console --skip-grant-tables --shared-memory

无密码进入mysql mysql -u root

清空root 密码 UPDATE user SET authentication_string="" WHERE user=“root”;

另一个终端无密码进入

F:\MySQL\mysql-8.0.13-winx64\bin>mysql -u root -pEnter password: *******ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)F:\MySQL\mysql-8.0.13-winx64\bin>mysql -u rootWelcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 7...Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql> USE mysql;Database changedmysql> SELECT user, authentication_string FROM user;+------------------+------------------------------------------------------------------------+| user | authentication_string |+------------------+------------------------------------------------------------------------+| mysql.infoschema | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED || mysql.session | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED || mysql.sys | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED || root | 123456 |+------------------+------------------------------------------------------------------------+4 rows in set (0.34 sec)mysql> UPDATE user SET authentication_string="" WHERE user="root";Query OK, 1 row affected (0.20 sec)Rows matched: 1 Changed: 1 Warnings: 0mysql> SELECT user, authentication_string FROM user;+------------------+------------------------------------------------------------------------+| user | authentication_string |+------------------+------------------------------------------------------------------------+| mysql.infoschema | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED || mysql.session | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED || mysql.sys | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED || root | |+------------------+------------------------------------------------------------------------+4 rows in set (0.00 sec)mysql> FLUSH privileges;Query OK, 0 rows affected (0.10 sec)mysql> quit;Bye登录后复制

你可以通过停止 mysqld 进程、在运行 mysqld 的 cmd 终端中使用 Ctrl+C 结束任务，或者直接关闭终端来结束 mysqld 任务。

需要先停止运行上述 mysqld 任务,否则报错

F:\MySQL\mysql-8.0.13-winx64\bin>net start mysqlMySQL 服务正在启动 .MySQL 服务无法启动。服务没有报告任何错误。请键入 NET HELPMSG 3534 以获得更多的帮助。

先停止上述 mysqld 任务

F:\MySQL\mysql-8.0.13-winx64\bin>net start mysqlMySQL 服务正在启动 ...MySQL 服务已经启动成功。

现在 mysql root 已经没有了密码

F:\MySQL\mysql-8.0.13-winx64\bin>mysql -u root -pEnter password:Welcome to the MySQL monitor. Commands end with ; or \g....Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql>

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