如何在没有典型数据库设置的情况下连接到rails中的数据库并检索结果

I have an application using Ruby on Rails where a user will be providing a connection string and will be requesting data from their database. I found a link that get's me part of the way and thought to post a question to see if anyone has experience in this. Here's something I've found:I have an application using Ruby on Rails where