GroupManagerMySQL

How does it work:

Whenever you change a player group, it will be saved in the database.
After you join any server it will check if the group you have is not the same as the database one. Then, the group will get updated.

Commands:

• /gmmysql reload - reloads the config file
• /gmmysql info - shows database info from your config file

Permission: groupmanagermysql.*

Configo:

host: "localhost"
port: 3306
database: "test"
username: "root"
password: "123"

Installation:

Just put it inside all of your spigot servers plugins folder.