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)
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>
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
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 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>
以上就是MySQL8.0怎么正确修改密码的详细内容，更多请关注创想鸟其它相关文章！
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