MySQL8.0修改密码的正确姿势分享

吾爱主题阅读：120 2024-04-02 18:54:24 评论：0

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

1 2 3 4 5 6 7 8 mysql> USE mysql; Database changed mysql> UPDATE user SET authentication_string= "123456" WHERE user = "root" ; Query OK, 1 row affected (0.39 sec) Rows matched: 1 Changed: 1 Warnings: 0 mysql> FLUSH privileges ; # 刷新保存 Query OK, 0 rows affected (0.13 sec)

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 -p
Enter 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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 ALTER USER 'root' @ 'localhost' IDENTIFIED WITH mysql_native_password BY "your_password" ; mysql> USE mysql; Database changed mysql> 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 1 mysql> 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; Bye F:\MySQL\mysql-8.0.13-winx64\bin>mysql -u root -p Enter password : ******* ... mysql>

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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 F:\MySQL\mysql-8.0.13-winx64\bin>mysql -u root -p Enter password : ******* ERROR 1045 (28000): Access denied for user 'root' @ 'localhost' (using password : YES) F:\MySQL\mysql-8.0.13-winx64\bin>mysql -u root Welcome 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 changed 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 | 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: 0 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 | | + ------------------+------------------------------------------------------------------------+ 4 rows in set (0.00 sec) mysql> FLUSH privileges ; Query OK, 0 rows affected (0.10 sec) mysql> quit; Bye

停止 mysqld 任务，Ctrl+C 结束任务，或者直接关闭运行 mysqld 的 cmd 终端。

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 mysql
MySQL 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 mysql
MySQL 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 -p
Enter 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>