Common Errors

by database backed website application programmers, by Tracy Adams

(part of the ArsDigita Community System Developer's guide)

This document contains common errors and important facts to be aware of when building new ACS pages. The examples use the standard ACS platform (Oracle, AOLserver, Tcl), but most demonstrate generic issues. Obtaining a sound understanding of these issues is a good exercise in learning the fine points of database backed website design.

Special characters

User input

HTML Tables

Cookies and domains

Infinite Loops

Case sensitivity

Oracle and Nulls



Database Handles

TCL Confusion



The following a current problems should be fixed in the future.

AOLServer Problems