Dave Hahn wrote:

Sorry if this has been brought up before.  I like the clean interface
for Torque, but have an audit trail requirement I'd like to know if
there is a solution for using Torque.  This is a legacy system I'd like
to interface to.

Upon any insert, save, or delete of an object, I need to also log
column values to a normalized audit trail table.

In SQL terms, consider this update:

update A set a1=v1, a2=v2 where rec_id=1

causes

 insert into audit values ('A', 1, 'a1', old_a1, v1)
 insert into audit values ('A', 1, 'a2', old_a2, v2)

as part of the save transaction.

It seems I could accomplish this if there is some callback mechanism,
and I can get at column values that have changes between the persisted
version of the object and the currently being saved object. Can this
be accomplished? Any hints on how?


Torque does not provide a specific solution to your problem. You could I guess modify the velocity templates used to generate your OM classes to write the audit records, but it would probably be a fair chunk of work and you would need to re-do it each time you upgrade Torque versions. Perhaps a simpler approach would be to modify the torque templates to provide the desired callbaback only - at least this would minimise the maintenance necessary when upgrading versions.

HTH,

Scott

--
Scott Eade
Backstage Technologies Pty. Ltd.
http://www.backstagetech.com.au





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