DBeaver 没办法连接mysql可能的情况

DBeaver 无法连接mysql可能的两种情况：

1. mysql user 没有远程连接权限。

mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select user,host from user;
 --------------- ----------- 
| user          | host      |
 --------------- ----------- 
| mysql.session | localhost |
| mysql.sys     | localhost |
| root          | localhost |
 --------------- ----------- 
3 rows in set (0.00 sec)

# 修改远程登录权限
mysql> update user set host = '%' where user = 'root';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> select user,host from user;
 --------------- ----------- 
| user          | host      |
 --------------- ----------- 
| root          | %         |
| mysql.session | localhost |
| mysql.sys     | localhost |
 --------------- ----------- 
3 rows in set (0.00 sec)

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

2. 防火墙导致端口无法访问，可以使用 telenet 试试，然后做防火墙设置

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