RE: CHAIN vs. SETLL -- RPG400-L

Or use the (E) extender and action any errors.
The difference is that the Error should only happen occasionally as
opposed to the preventative  SETLL everytime.

And yes, i think the (E) is more overhear - when it happens...



At 11:03 AM 8/22/2001, you wrote:
>As long as you do the SETLL just before writing out a record, we are talking
>split second here.  In most cases, it should not be a problem.
>
>Joe Giusto II
>Programmer/Analyst
>Ritz Camera
>Beltsville, MD
>301-419-3209 x347
>410-813-2812 x347
>
>  -----Original Message-----
>From:   rpg400-l-admin@midrange.com [mailto:rpg400-l-admin@midrange.com]  On
>Behalf Of Alan Addison
>Sent:   Monday, August 20, 2001 1:36 PM
>To:     rpg400-l@midrange.com
>Subject:        RE: CHAIN vs. SETLL
>
>Is there not the caveat to this that records added by other programs since
>the file was opened may or may not show up in the resulting operation?   I
>seem to remember this bu am not sure about it.
>
>Alan
>
>-----Original Message-----
>From: rpg400-l-admin@midrange.com [mailto:rpg400-l-admin@midrange.com]On
>Behalf Of PatrickConner@parkdalemills.com
>Sent: Monday, August 20, 2001 1:10 PM
>To: rpg400-l@midrange.com
>Subject: Re: CHAIN vs. SETLL
>
>
>
>If a chain fails it does the same thing as a setll. However, it will
>retrieve info if it is successful.
>It is more efficient to use setll when you are only interested if a record
>exists in a file.
>
>Patrick Conner
>www.ConnecTown.com
>(828) 244-0822
>
>
>
>                     "Reeve Fritchman"
>                     <reeve@ltl400.com        To:     "RPG400-L@midrange.
>com" <RPG400-L@midrange.com>
>                     >                        cc:
>                     Sent by:                 Subject:     CHAIN vs. SETLL
>                     rpg400-l-admin@mi
>                     drange.com
>
>
>                     08/20/01 01:00 PM
>                     Please respond to
>                     rpg400-l
>
>
>
>
>
>
>My understanding is that CHAIN grabs the record and fills the input buffer,
>whilst (it's the British influence taking over) SETLL checks the access
>path
>only for the existence of the key.
>
>If I want to know if a record with an identical key is already in the file,
>I SETLL.  Yes, there are application reasons to do this!
>
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