Nodejs从数据库中检索信息并传递给JavaScript

I am writing a simple application which is running on Nodejs. I am using centos. Front end is html and JavaScript. In the HTML page, I have 2 forms. On selection of data from form1 and clicking on a button, a table has to be loaded inside form2. I have managed to do this functionality with JavaScript. (For now I have used hard coded values.) If I were to retrieve values from database, how should I proceed? I am a noob in Nodejs ! I am processing all the requests using similar methods as below:I am writing a simple application which is runn