MySQL 8下忘密碼後重置密碼的辦法

第一步，關掉系統服務

net stop mysql

第二步，建立一個文字檔案，內含一條密碼修改命令（''中間可以填寫修改後的密碼）

ALTER USER 'root'@'localhost' IDENTIFIED BY '';

第三步：命令列方式啟動伺服器，指定啟動時執行上述的密碼修改命令檔案

mysqld --init-file=d:\mysql\c.txt --console

具體操作截圖

Navicat報1521錯誤

無法連線的原因是mysql8與mysql5的加密方式不同。

連線時會出現1251錯誤。

解決辦法：

1.先通過命令列進入mysql的root賬戶：

<code class="language-plain">PS C:\Windows\system32> mysql -uroot -p</code>  

再輸入root的密碼：

Enter password: ******

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 18

Server version: 8.0.11 MySQL Community Server - GPL

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>
 

2.更改加密方式：

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'password' PASSWORD EXPIRE NEVER;

Query OK, 0 rows affected (0.10 sec)

3.更改密碼：

mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password';

Query OK, 0 rows affected (0.35 sec)

4.重新整理：

mysql> FLUSH PRIVILEGES;

Query OK, 0 rows affected (0.28 sec)
 

// 如果報錯   ERROR 1396 (HY000): Operation ALTER USER failed for 'root'@'%' ：

則是遠端訪問許可權不正確，先選擇資料庫，檢視一下再更改：

mysql> use mysql;

Database changed

mysql> select user,host from user;

+------------------+-----------+

| user | host |

+------------------+-----------+

| mysql.infoschema | localhost |

| mysql.session | localhost |

| mysql.sys | localhost |

| root | localhost |

+------------------+-----------+

5 rows in set (0.00 sec)

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