RE: equivalent of lock and update in SQL

The UDF idea sounds like your best bet. Easy to implement.

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Steve Richter
Sent: Wednesday, March 20, 2013 12:21 PM
To: Midrange Systems Technical Discussion
Subject: Re: equivalent of lock and update in SQL

ok. thanks. Just checking that it can't be done. I am working with some
existing code and can't use SEQUENCE and IDENTITY.



On Wed, Mar 20, 2013 at 2:58 PM, Charles Wilt <charles.wilt@xxxxxxxxx>wrote:

The equivalent SQL would be to declare an update-able cursor with
appropriate isolation, fetch the record using it then do an UPDATE
WHERE CURRENT OF CURSOR <...> then commit...

Only other option would be to do a LOCK TABLE prior to the SELECT INTO
and UPDATE..

Personally, I'd consider using SQL identity or sequence columns...

Otherwise, just use your RPG as a UDF or SP.

Charles



On Wed, Mar 20, 2013 at 2:30 PM, Steve Richter
<stephenrichter@xxxxxxxxx

wrote:

in rpg record I/O I lock a control record, increment a control
number,

then

update the control record. Which reliably gives me a unique value.

C** GET NEXT SID NUMBER FROM WCMAST
C inwacd CHAIN WCREC
C EVAL WCNSID += 1
C UPDATE WCREC
/free
outSid = wcnsid ;
/end-free

Can I use SQL to do the same thing?

thanks,
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