RE: Record lock checking in RPG or CL?

Yup. Went through my mind, but escaped before I was able to write it
down! :-) 

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Bob P. Roche
Sent: Monday, November 13, 2006 3:13 PM
To: RPG programming on the AS400 / iSeries
Subject: RE: Record lock checking in RPG or CL?

This is a great method, but don't forget when to verify the data has not
changed since the first read before doing the update. You didn't have a
lock, so another program could have changed the record while your
program was waiting on the user.




"Turnidge, Dave" <DTurnidge@xxxxxxxxxxxxxxxxxxxx> Sent by:
rpg400-l-bounces@xxxxxxxxxxxx
11/13/2006 03:03 PM
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Subject
RE: Record lock checking in RPG or CL?






AFIAC - if you are doing that check in CL, it's too late... First of
all, you need to do a two-read process. That is, when you initially read
the record, you do it without a record lock. When you get to the point
you are ready to update (which is the only thing that NEEDS a lock) you
read again with the lock, and update the record which releases the lock.


The only problem with this method is if ANOTHER program is not set up to
do the same thing, and locks the record while the user is at lunch... 

Dave 

________________________________________________________________________

HI,

 

 I have a program that I was not concerned of a record lock situation.
Now it has happened so I have to put in code to prevent the hanging. 

Is there any drawbacks to just to do this in the CL, ?

 

TIA,

Phil


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