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Use the same dataset as both input and output in PL/I


IBM Mainframe Forums -> PL/I & Assembler
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Z_Ubavelski

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Joined: 05 Oct 2014
Posts: 2
Location: Switzerland

PostPosted: Wed Nov 12, 2014 4:03 am
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Hi mainframe community,

I have a problem in PL/I. I want to use the same dataset as both input and output.

At first I want to write to the dataset as output. In case of abend I want to read the same file and use the input.

Thanks in advance.

Regards,
Zoran
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prino
Warnings : 1

Senior Member


Joined: 07 Feb 2009
Posts: 1238
Location: Vilnius, Lithuania

PostPosted: Wed Nov 12, 2014 5:01 am
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Code:
open file(whatever) input;

and
Code:
open file(whatever) output;


Or use dynamic allocation available in Enterprise PL/I.

The far bigger problem is that your dataset may suffer from integrity problems after an abend. There is no way of knowing if the last record in the dataset is actually the last record that you processed.

BAD DESIGN! BAD, BAD, BAD!
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expat

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Joined: 14 Mar 2007
Posts: 8794
Location: Welsh Wales

PostPosted: Wed Nov 12, 2014 2:49 pm
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Totally agree with Prino. That is one of the worst ideas ever to hit the IT industry over 40 years ago, and yet people still think about doing it.

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Z_Ubavelski

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Joined: 05 Oct 2014
Posts: 2
Location: Switzerland

PostPosted: Thu Nov 13, 2014 3:10 am
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Hi all,

thank you for your help. I was able to solve the problem.

Regards,
Zoran
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