今天下了个 MySQL8.0，发现Navicat连接不上，总是报错1251；

原因是MySQL8.0版本的加密方式和MySQL5.0的不一样，连接会报错。

试了很多种方法，终于找到一种可以实现的：

　　更改加密方式

　　1.先通过命令行进入mysql的root账户：

PS C:\Windows\system32> mysql -uroot -p

　　再输入root的密码：

Enter password: ******

Welcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 18Server version: 8.0.11 MySQL Community Server - GPLCopyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.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.更改密码：

mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password';Query OK, 0 rows affected (0.35 sec)

4.刷新：

mysql> FLUSH PRIVILEGES;Query OK, 0 rows affected (0.28 sec)

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

则是远程访问权限不正确，先选择数据库，查看一下再更改：

mysql> use mysql;Database changedmysql> 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)

需要将 host 改为 %

https://blog.csdn.net/weixin_41065548/article/details/82895482