MySQL8.0正确修改密码的姿势

蔚落 2021-11-13 14:46 429阅读 0赞

**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 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

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

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>