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 18
server version: 8.0.11 mysql community server - gpl
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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：该例子中 123为新密码
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，查看一下再更改：
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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