MySQL8.0修改密碼的正確姿勢分享

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前言

mysql 更新完密碼，總是拒絕連接、登錄失敗?MySQL8.0 不能通過直接修改 mysql.user 表來更改密碼。正確更改密碼的方式備註: 清空root密碼

MySQL8.0 不能通過直接修改 mysql.user 表來更改密碼。

因為authentication_string字段下隻能是MySQL加密後的43位字符串密碼，其他的導致錯誤。錯誤不報出，但是無法再登錄mysql，總是會提示 無法認證。

參考：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 之後取消瞭password 函數，authentication_string=password("123456") 會報錯

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

如果 你已經這樣更改密碼，並且導致瞭無法進入mysql。本人表示同情之時，還為瞭你提供瞭詳細的解決方案。請查看本文備註：清空root 密碼

正確更改密碼的方式

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>
  • 備註: 清空root密碼

停止 MySQL 任務 net stop MySQL

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

無密碼進入mysql mysql -u root

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

另一個終端無密碼進入

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 任務，Ctrl+C 結束任務，或者直接關閉 運行 mysqld 的 cmd 終端。

需要先停止運行上述 mysqld 任務,否則報錯

F:\MySQL\mysql-8.0.13-winx64\bin>net start mysql
MySQL 服務正在啟動 .
MySQL 服務無法啟動。

服務沒有報告任何錯誤。

請鍵入 NET HELPMSG 3534 以獲得更多的幫助。

先停止上述 mysqld 任務

F:\MySQL\mysql-8.0.13-winx64\bin>net start mysql
MySQL 服務正在啟動 …
MySQL 服務已經啟動成功。

現在 mysql root 已經沒有瞭密碼

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>

總結

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