How to ALLOC a GDG DS for WRITE access within COBOL

Klaus · Posted: Mon Jan 14, 2008 7:33 pm

Hi all!

I am trying to allocate an GDG dataset within a COBOL stored procedure, without using JCL. The GDG base is already defined.
The new allocated dataset is supposed to be used for WRITE access in the same stored procedure.
Does anyone have experience with stored procs which use BPXWDYN, or any similar pgm?

A sample of a valid stored proc, which defines and uses a new GDG dataset woul be very much appreciated.

I tried without success to use the samples I found in the forum, as they are refferring to existing datasets.

Thanks,
Klaus

ofer71 · Posted: Mon Jan 14, 2008 8:15 pm

If you run under TSO, you can use the ALLOCATE command from within COBOL.

O.

Klaus · Posted: Mon Jan 14, 2008 8:22 pm

Sorry, I forgot to mention, that I need to allocate the file dynamically. I do not know whether in this cas I can use the ALLOCATE command.

Regards
Klaus

ofer71 · Posted: Mon Jan 14, 2008 8:26 pm

Why not?

O.

Klaus · Posted: Tue Jan 15, 2008 6:17 pm

Sory, but I am not aware of any ALLOCATE command within COBOL.

Klaus

enrico-sorichetti · Posted: Tue Jan 15, 2008 6:20 pm

ofer71 · Posted: Tue Jan 15, 2008 10:07 pm

enrico -

He probably means DB2 stored procedure.

O.

Douglas Wilder · Posted: Tue Jan 15, 2008 11:33 pm

I found on this forum how to call a rexx or clist from cobol to dynamically allocate datasets.
First CALL IKJTSOEV to setup the TSO environment then CALL IKJEFTSR to run your REXX or clist. Search this forum to get the details and code.

ofer71 · Posted: Wed Jan 16, 2008 12:22 am

Douglas - Using these services, one can issue the ALLOCATE command (or any TSO comand) directly from within COBOL.

O.

Douglas Wilder · Posted: Wed Jan 16, 2008 12:44 am

Yes, It is true you can execute an ALLOCATE or any other TSO command from COBOL this way. In my case it simplified the COBOL program to execute a REXX that could execute multiple TSO commands and choose subparameter values instead of coding them each into the COBOL program.

Klaus · Posted: Fri Jan 18, 2008 5:16 pm

Hello everyone,

thank you for your hints, I'l try to use ALLOCATE.

Regards
Klaus

mmwife · Super Moderator Joined: 30 May 2003 Posts: 1592

Hi Klause,

I've not used ALLOC for creating GDGs, but it looks like you must provide the full DSN (w/the G/V extension).

That could be a problem unless you use LISTCAT, but even there it's possible someone can create a new generation in the time between the LISTCAT and the ALLOC.