解决navicat连接上mysql数据库

前言

新安装完数据库后，使用mysqladmin修改了数据库的密码，不过没有给主机授权，导致navicat连接不上数据库，报错如下

所以，不建议大家使用mysqladmin修改数据库的密码

解决方法：grant 给主机授权

[root@localhost ~]# mysql -uroot -p123.com
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 12
Server version: 5.7.30 MySQL Community Server (GPL)

Copyright (c) 2000, 2020, 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> 
mysql> 
mysql> grant all privileges on *.*  to root@'172.16.46.%' identified by '123.com';
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

测试连接

如果还有其他的错误，根据报错排查

• mysql服务确认是否已经开启？
• 数据库的端口号是否更改？连接时是否一致？
• 防火墙是否关闭？或者开放3306端口？