RE: SQL Locking...

["Turnidge, Dave" <DTurnidge@xxxxxxxxxxxxxxxxxxxx>]

But we're not locking on the record we are attempting to update. We are
locking on the record we are attempting to get data from.  

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Alan Shore
Sent: Friday, November 17, 2006 12:49 PM
To: Midrange Systems Technical Discussion
Subject: Re: SQL Locking...

Dave - wont the same thing happen if you attempt to update a record in
RPG/RPGILE/COBOL etc, if the program does NOT have a lock on that
record.
If another user has a lock on that record, the program cannot get an
exclusive lock



Alan Shore

NBTY, Inc
(631) 244-2000 ext. 5019
AShore@xxxxxxxx

midrange-l-bounces@xxxxxxxxxxxx wrote on 11/17/2006 01:39:01 PM:

> I have a fellow programmer who has this code in a CL program:
>
> Update OEP013W a set a.wkclosr =
>    (select mtclon from OETITLP b where a.wkorder = b.mtordn)
>    where a.wkclosr = 0
>
> Where OEP013W is a work file in QTEMP; OETITLP is a production PF.
>
> If someone is in the record (locking it) this statement fails.
>
> If you do the sub-SELECT statement by itself with someone locking the 
> record, it doesn't fail.
>
> Does a SELECT in an UPDATE statement have different rules?
>
> It was our understanding that a SELECT did not lock, or require a 
> lock, and we assumed would not be inhibited by someone else locking a 
> record in that file.
>
> TIA
>
> Dave
>
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