Hi Lizette, as I noted originally, the vendor program uses control
statements, where certain values are passed in on the control statement.
These user-defined values drive the DD statement it is looking for. In
my example, the table number is being passed in on a SYSIN control
statement (it could be with the other parameters, like ....,TBL=01,...)
, and so the program knows it needs to find DD statement TB01DAT. Since
it is vendor code, I don't know what the do internally, but I suspect
with assembler, you can build your own DD statement on the fly before
you try to open a file.
Billy
------ Original Message ------
From: "Lizette Koehler" <stars...@mindspring.com>
To: IBM-MAIN@listserv.ua.edu
Sent: 12/30/2020 3:55:32 PM
Subject: Re: Using symbolic DD names
So the question becomes, can your Program handle a constantly changing DD Name?
What would be the benefit from doing this?
In Cobol you predefine (If I am allowed to use this word) the IO Section.
Which specifies the DD name - consider that hard coded.
I am not aware of any language construct that allows for a DD name to be
randomly selected in a program. On z/OS
I would be interested if anyone has an example.
And yes Scheduling products can supply symbolics where native z/OS might now.
Could you provide an example where your program when it executes would use a
random DD name in JCL?
Lizette
-----Original Message-----
From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of
Billy Ashton
Sent: Wednesday, December 30, 2020 12:22 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Using symbolic DD names
Hey folks! I have a vendor product program that looks for different DDnames
depending on the control statements passed into the program. Is there any way to
define a dynamic DD statement using JCL symbols? For example, I would love to have
//TB&tno.DAT to correspond to TB01DAT, TB14DAT, or TB67DAT if I use SET TNO=01
or 14 or 67.
Is such a thing possible? I tried using an instream proc definition and INCLUDE
MEMBER= that proc name, but that failed, and of course, I tried the straight up
JCL as above, and it failed.
What do you all think?
Billy
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