public String getColumnData(int i) throws Exception {
	   if (i == 0)
		   return getUserName();
	   else if (i == 1) 
		   return getPassword();
	   else if (i == 2)
		   return getFirstName();
	   else if (i == 3)
		   return getLastName();
	   else if (i == 4)
		   return getEmail();
	   else if (i == 5)
		   return getRole();
	   else
		   throw new Exception("Error: invalid column index in Audience table");    
   }