解决：Navicat连接不上MySQL 8.0

转载自 https://www.cnblogs.com/shiysin/p/shiysin.html

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。

更改加密方式

1.先通过命令行进入mysql的root账户：

PS C:Windowssystem32> 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 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)