public String getColumnData(int i) throws Exception {
	   if (i == 0)
		   return getFileID();
	   else if (i == 1)
		   return getProjectID();
	   else if (i == 2) 
		   return getFormat();
	   else if (i == 3)
		   return getFileName();
	   else if (i == 4)
		   return getLocation();
	   else
		   throw new Exception("Error: invalid column index in courselist table");    
   }