获取数据库连接失败: 获取数据库连接失败

获取数据库连接失败: 获取数据库连接失败:Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

这个是数据库无法连接，可参考Wiki文档进行排查：https://wiki.smartbi.com.cn/pages/viewpage.action?pageId=76677652