navicat在連接MySQL8.0以上版本的時候，總是報錯1251；原因是MySQL8.0版本的加密方式和MySQL5.0的不一樣，連線會報錯。以下就為大家介紹詳細的解決方法。
推薦教學：MySQL資料庫入門影片教學
#1、先透過命令列進入mysql的root帳號：
PS C:\Windows\system32> mysql -uroot -p
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：此範例中123為新密碼
mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123'; Query OK, 0 rows affected (0.35 sec)
4.刷新：
mysql> FLUSH PRIVILEGES; Query OK, 0 rows affected (0.28 sec)
// 如果報錯ERROR 1396 (HY000): Operation ALTER USER failed for 'root'@'%'：
則是遠端存取權限不正確，先選擇資料庫，查看再更改：
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)
最後重新啟動MySQL服務，在重新連線就行了。
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