title: Check if role exists in DB?
body: <p>I want to add users to the same role in more than one database. However the role may or may not be present in each database. How can I check if the role exists in each database and if it does, add users to that role?</p>
  
  <p>e.g.
  IF role exists
  BEGIN
      Add user in role
  END</p>