tags:

views:

33

answers:

1
+1  Q: 

Logging of changed fields/columns in DB updates

Our product ecosystem: Web/Enterprise Application using EJB in Glassfish V3 and PostgreSQL 8.4.

How to detect which field was changed without using dirty flags or re-reading the same record(s) before updating it ? Why: For audit purpose/logging

Any recipes or ideas ?

Thanks Sven

+1  A: 

In PostgreSQL, write trigger on UPDATE that compares values in NEW and OLD, and reports somehow what has changed.

depesz  2010-02-02 11:26:16
not sure how to return the result into the application layer where the logging is done.
devdude  2010-02-02 23:38:05
If you're doing logging in application, make the comparison also in application. Or just do the audit logging in database - it's simpler.
depesz  2010-02-03 08:43:00

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