⽬录
前⾔
mysql5.7.9之后取消了password函数，authentication_string=password("123456")会报错
正确更改密码的⽅式
总结
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 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$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEV
ERBRBEUSED |
| 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>
总结
密码修改
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