public void setColumnData(int i, Object value) throws Exception {
	   if (i == 0) 
		   personID = (String) value;
	   else if (i == 1) 
		   name = (String) value;
	   else if (i == 2) 
		   projectID =  (String) value;
	   else if (i == 3)
		   role = (String) value;
	   else
		   throw new Exception("Error: invalid column index in courselist table");    
   }