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Conditional step execution based on PDS member contents


 
IBM Mainframe Forums -> JCL & VSAM
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Lccole10

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Joined: 19 Feb 2020
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PostPosted: Wed Feb 19, 2020 10:07 pm
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Sorry if this is a simple question, but I couldn't seem to come up with the right search criteria to find my answer.

I have a PDS member which is being used as a switch for a process.
It's contents begins with either 'UPDATE ' or 'READONLY' (followed by some positional flag which aren't relevant for my purposes).
I'd like to execute a particular step only when the value is 'UPDATE '.

Thoughts?
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prino

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PostPosted: Wed Feb 19, 2020 10:13 pm
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Write a program to read it, and set an appropriate returncode, you cannot do this with just JCL.
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Lccole10

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PostPosted: Thu Feb 20, 2020 12:31 am
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prino wrote:
Write a program to read it, and set an appropriate returncode, you cannot do this with just JCL.


I was afraid that might be the case, but was hoping there was some solution I hadn't stumbled across yet.

There is a program in a different proc (earlier within the job) that is reading it already. I guess I could have that program set it's procstep RC to something specific, and then have my later jobstep check that return code. Feels a bit messy, but maybe I'll test it out and see how it looks.
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Joerg.Findeisen

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PostPosted: Thu Feb 20, 2020 12:59 am
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If the member only has this ONE line and nothing else..

Code:
//*                                                               
//*   RC1 = STRING FOUND, RC0 = NOT FOUND, RC28 = EMPTY MEMBER   
//*                                                               
//SEARCH  EXEC PGM=ISRSUPC,PARM=(SRCHCMP,'ANYC,NOSUMS,LMTO')     
//NEWDD  DD DISP=SHR,DSN=&SYSUID..TRIGGER.CNTL(TRIGGER)           
//OUTDD  DD SYSOUT=*                                             
//SYSIN  DD *                                                     
CMPCOLM 1:6                                                       
SRCHFOR 'UPDATE'                                                 
/*


The string 'UPDATE' must occur anywhere from column 1 to 6 in the trigger member.
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daveporcelan

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Joined: 01 Dec 2006
Posts: 746
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PostPosted: Thu Feb 20, 2020 1:07 am
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Another option that should work.

This will end in 0000 if UPDATE is found in SORTIN
This will end in 0004 if UPDATE is not found in SORTIN

Code:
//CHECK1   EXEC PGM=SYNCSORT,PARM='NULLOUT=RC4'
//*
//SYSOUT   DD SYSOUT=Z
//*
//SORTIN   DD *
XPDATE
/*
//SORTOUT  DD SYSOUT=Z
//*
//SYSIN    DD *
  SORT FIELDS=COPY
  OUTFIL INCLUDE=(1,6,CH,EQ,C'UPDATE')
/*
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Joerg.Findeisen

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PostPosted: Thu Feb 20, 2020 1:14 am
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Minor Update:

Code:
//SEARCH  EXEC PGM=ISRSUPC,PARM=(SRCHCMP,'ANYC,NOSUMS,LMTO')   
//NEWDD  DD DISP=SHR,DSN=&SYSUID..TRIGGER.CNTL(TRIGGER)           
//OUTDD  DD SYSOUT=*                                           
//SYSIN  DD *                                                 
CMPCOLM 1:6                                                   
CMPLINE TOP 1 BTM 1                                           
SRCHFOR 'UPDATE'                                               
/*


Only LINE #1 is allowed to be searched for the string here.
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Joerg.Findeisen

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PostPosted: Thu Feb 20, 2020 1:17 am
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@daveporcelan: I would add STOPAFT=1 as well to read exactly one line.
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daveporcelan

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PostPosted: Thu Feb 20, 2020 1:18 am
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Sure that works. In this case, the requirement suggests this is a 'switch', probably a single line.
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Joerg.Findeisen

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PostPosted: Thu Feb 20, 2020 1:21 am
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I know my own test cases for such things, so better make it more idiot proof.. icon_lol.gif
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Phrzby Phil

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Joined: 31 Oct 2006
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Location: Richmond, Virginia

PostPosted: Thu Feb 20, 2020 11:39 pm
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Just a note on side effects.

Your suggestion about modifying a program earlier in the job to also set the return code might backfire at some time in the future (I know - redundant!) if that program's functionality is not clearly linked to your proposed modification.

If that program is also used in other jobs that have no such requirement, then there is the added chance that someone might "clean it up."
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