public void setColumnData(int i, Object value) throws Exception {
	   if (i == 0) 
		   userName = (String) value;
	   else if (i == 1) 
		   password = (String) value;
	   else if (i == 2)
		   firstName = (String) value;
	   else if (i == 3)
		  lastName = (String) value;
	   else if (i == 4)
		  email = (String) value;
	   else if (i == 5)
			  role = (String) value;
	   else
		   throw new Exception("Error: invalid column index in Audience table");    
   }