Re: Notification when something changes in the DB

I'm fairly certain Oracle Forms does this too. I've had to write some complex forms that worked on updateable views, and I had to re-write Forms' on-update and on-lock triggers myself.

yosi

dgoulet_at_vicr.com wrote:

> Not so weird, PeopleSoft does things in a similar manner. When a panel
> in PeopleTools is queried a copy of the data is sent to the screen for
> modification. A second in retained in memory as the original version.
> When the user presses the 'save' button a third copy is retrieved from
> the database and compared to the second copy. If they match the
> modified data is saved to the database which was queried the second time
> 'for update of' so that a row level lock is established at that time.
> Now if the data had been modified this irratating message pop-up appears
> telling you that the underlying data has been modified & you have to
> start all over again.
>
> In general letting Oracle handle the locking of data is the best way to
> go, so either acquire a 'for update' lock when you pull the data or do
> the double query if you really need it.
>
> Dick Goulet
> ---------------------- Reply Separator ----------------------
> Author: John Lewis <jlewis_at_punchnetworks.com>
> Date: 9/4/01 1:51 PM
>
> >For whatever reasons this solutions was found to be not sound by a 3rd
> >party "consulting" company which reccommended "Oracle native
> technology"
> >to perform this check.
>
> Hmm... a trigger seem native to me. Perhaps they meant auditing.
>
> -----Original Message-----
> [mailto:Val_Gamerman/Victoria_Financial.VICTORIA_FINANCIAL_at_lnn.com]
> Sent: Tuesday, September 04, 2001 2:33 PM
> To: Multiple recipients of list ORACLE-L
>
> Hello fellow DBAs',
>
> I have a weird question that I was asked. My first reaction was to
> answer:
> "There is no such thing", however I was talked into posting this
> question
> here :-)
>
> 1. An applicaiton selects certain records (from different tables) from a
> database..
>
> 2. When time comes to update some of these records in the datbase
> application needs to know if records that it's about to update have been
> modified by some other user.
>
> 3. Currently this is achieved with via triggers. Before performing an
> update application checks if trigger updated a certain field in the
> database which serves as an indication that records/fields of interest
> have
> been updated.
>
> For whatever reasons this solutions was found to be not sound by a 3rd
> party "consulting" company which reccommended "Oracle native technology"
> to perform this check. This company is now unreachable and "management"
> is
> requesting to change the application to follow this "review".
>
> Management explanation of how it needs to be done is based on what ADO
> would do where if you perform an optimistoc lock and then later on try
> to
> update an already updated record it would tell you about this upfront.,
> or
> you would be able to check upfront WITHOUT requiring the DB. I am not
> familiar with ADO, that much so I can not comment on it.
>
> Can somebody tell me if they can think of way to achieve this?
>
> I know it sounds rather weird request -- it is.
>
> Thanks in advance for any thoughts on this,
> Val Gamerman.
> Oracle DBA
>
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> Author:
> INET: Val_Gamerman/Victoria_Financial.VICTORIA_FINANCIAL_at_lnn.com
>
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> Author: John Lewis
> INET: jlewis_at_punchnetworks.com
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> Author:
> INET: dgoulet_at_vicr.com
>
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--
Thanks,

Yosi


---------------------------------------------------------
Yosi Greenfield
Oracle Certified DBA
ygreenfield_at_compuserve.com


-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Yosi Greenfield
  INET: yosi_at_comhill.com

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