Connect Nodejs Project to MySql with rethinkdb Already connected?

I have a Nodejs project using Koa as a Framework and its connected to Rethink Db and its working fine . I have a config file in which all the settings are done and all runs smoothly

I am Just wondering that how will i connect it to MySQL as well. And also i dont know yet that how this will work . like if i save a record it will be stored to both DBs or i have to save different records depending upon my needs .

Thanks in Advance

via DEO