Databases
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    <p>Assuming you want to keep this in the app layer I would advice to use a model layer with properties per field to do the logging. All data access then goes trough this data model, giving you a hook to add functionality. </p> <p>An <a href="http://www.martinfowler.com/eaaCatalog/activeRecord.html" rel="nofollow noreferrer">activerecord</a> based example (VBScript):</p> <pre><code> class cSomeEntity public db ' link to a db wrapper private id, dirty, loaded ' varous flags private sub class_initialize dirty = false loaded = false end sub private sub class_terminate if dirty then db.execute("update some_table set some_field=? where id=?", array(p_some_field, id)) end if end sub public sub load_by_id(value) dim rs set rs = db.fetch_rs("select id, some_field from some_table where id=?", array(id)) id = rs("id") p_some_field = rs("some_field") loaded = true end sub private p_some_field public property get some_field some_field = p_some_field end property public property let some_field(value) if not loaded then err.raise 1, , "Entity not yet initialized, call .load_by_id() first!" if value &lt;&gt; p_some_field then dirty = true make_log_entry("some_value", p_some_field, value) p_some_field = value end if end property private sub make_log_entry(field, old_value, new_value) db.execute("insert into audit_log (table, field, old_value, new_value) values (?, ?, ?, ?)", _ array("some_table", field, old_value, new_value)) end sub end class </code></pre> <p>It might seem a bit bloated, but it is more flexible than a trigger based approach. For example you can easily implement range checks and such. </p> <p>Secondly, when you need to write multiple entity classes you can push a lot of functionality in to a delegate class and use code template to write the property getter &amp; setters.</p>
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    1. POWhats the best way to audit changes on a particular form field?
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    1. USJoost Moesker
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