Your proposed solution is far too inflexible. Take a look at 
http://www.tonymarston.net/php-mysql/auditlog.html which describes a design 
with incorporates a fixed set of audit tables which can deal with logging 
changes to any number of application tables with any structure.

-- 
Tony Marston
http://www.tonymarston.net
http://www.radicore.org


""Mike Smith"" <[EMAIL PROTECTED]> wrote in message 
news:[EMAIL PROTECTED]
> I'm about to try this, but I'd like some suggestions. I have a inventory
> table that an employee can update specific fields if they are incorrect,
> e.g.
>
> [INVENTORY_TABLE]
> fields    example data
> part      1027P
> serial    543221-K
> qty       120
> location  G-5
>
> I'd like to record what changed. Let's say they change the serial. One way
> would be a "static" changes table:
>
> [INVENTORY_CHANGES]
> fields               example data
> old_part           1027P
> new_part          1027P
> old_serial         543221-K
> new_serial       543221-4
> ...
>
> I'm thinking a better/more flexible solution would be
>
> [INVENTORY_CHANGES]
> inventory_id (FK to inventory table)
> field (in this case it would be serial, detected by comparing POST values 
> to
> original values, but could be serial and qty/location)
> original         543221-K
> new_value     543221-4
>
> Just curious as to other possible solutions or problems with these 
> (probably
> the second one).
>
> Thanks,
> Mike Smith
> 



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