title: Create class name in Rails for existing table name present in SQL server
body: <p>I want to use SQL server table in rails.<br>
  Suppose I already have one table T_SDF in SQL server and I want to fetch all data from this table.</p>
  
  <p>How can I create a model or class in Rails?</p>
  
  <p>I am using Rails version 3.2.9 and Ruby version 1.9.3.</p>