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Copybook accessing in CICS at Runtime

 
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sarangwagh7

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Joined: 15 Mar 2007
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Location: Pune

PostPosted: Thu Dec 13, 2007 11:45 am    Post subject: Copybook accessing in CICS at Runtime
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Hi All,

In my program, the copybook name is runtime provided to CICS program, how can I access that copybook variables just by knowing the copybook name as a literal in program??

The requirement is :

From front screen we are getting the copybook name only and in CICS program we need to find out the variables defined in that copybook and send those variables to maps.

I am not able to access the copybook variables(expanded copybook) as I am getting the name of copybook in program at runtime.

Thanks,
Sarang
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Srihari Gonugunta

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Joined: 14 Sep 2007
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PostPosted: Thu Dec 13, 2007 12:15 pm    Post subject:
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Probably, first you need to find out the list of copybooks that are supposed to be populated from online. Include all these copybooks in the program and change the program to handle the copybook name entered via online and depending on the copybook name decide your further processing in your program.
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enrico-sorichetti

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PostPosted: Thu Dec 13, 2007 12:19 pm    Post subject: Reply to: Copybook accessing in CICS at Runtime
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Quote:
The requirement is :


I would say that the requirement is a little bit confusing/incomplete :-)
( assuming that the application is written in COBOL or PL/I )

A copybook ( in the sense used in this thread ) is the description of the record layout ...
WRITTEN ACCORDING TO THE SPECIFICATIONS OF THE PROGRAMMING LANGUAGE USED
(sentence capitalized to point out the environment )

Unless You implement in the application the same parsing logic of the programming language of the copybook
( i.e. a small piece of the compiler)
You will find out that the copybook, as it is, will be of very little use to You...
and it is not easy to write a generalized function/subroutine to achieve what You ask for

Just a few questions
( to point out the problems and help to better define the requirement )...
where would You store the copybook source,
How would You parse to find out the varable names and their types..
what about mapping different layouts for different record types in the same copybook
how to build a nameless map to accept generic data
what descriptions to provide for the fields displayed on the screen
what about keyed access to the data ( You wouldn' t want to read everything !!)
... and many more ...

Unless something was missing in the O/P at the moment I do not see any
other way...

UNLESS...
the copybooks relate to SQL tables...
the tables are defined with the proper comments..
You queried the SYSIBM.things to find out the table layout
build dynamically the query to retrieve the data You want to display
and .... and ....

but then why rewrite QMF ??


The easiest and quickest approach is to write a subroutine and a map
for each record layout that You want to display

maybe a dynamicall LINKED program with the same name as the copybook

get the name of the copybook==program
check in a table if a disply function is provided , or - fastest -
intercept the "exec cics LINK" error for program not found
and ... ... ...
decide if reandom or sequential access
and ... ...
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TG Murphy

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Joined: 23 Mar 2007
Posts: 149
Location: Ottawa Canada

PostPosted: Fri Dec 14, 2007 1:26 am    Post subject:
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Sounds to me like your requirement may have come from a Java programmer who is keen on using "reflection".

Check out the XML GENERATE and XML PARSE commands. These commands are relatively new to COBOL and it could be that your installation does not have access to them.

As Srihari already mentioned, you'll need to COPY in all possible copybooks.

Having thrown that suggestion out there, I agree with Enrico's feeling that the requirements here may not be well stated or understood.

As a alternative, consider using REXX to parse your copybooks. You can call REXX from a COBOL program. Consider running your copybooks through a REXX parser that outputs the data you want into 1 consolidated copybook - or perhaps pump the data into a file or database...
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sarangwagh7

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Location: Pune

PostPosted: Fri Dec 14, 2007 10:30 am    Post subject: Reply to: Copybook accessing in CICS at Runtime
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Dear All,

Thanks a Lot for your nice suggestions.
I am trying some clues from that.
But just to clear you the requirements again :

I am developing one tool which tests online programs.
So from CICS, i will invoke the transaction which is testing the service prog, provided with the program name which is to be test, and the input copybook.
Then at the back end, my program will send the Map according to copybook provided on CICS. So user will enter the require input fields on MAP, and my program will call the service program with the data input on map. execute it and throw the results on map ( whether it is successful or not)

As Input copybooks are different for different progs, i need to take the provided copybook in my program at run time, their I am getting stucked as i am getting copybook name at runtime as a literal in Linkage section.

Hope you understood now the situation.
If you get any idea how to generalize the test tool, your ideas are always welcome.

Thanks,
Sarang
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dick scherrer

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Joined: 23 Nov 2006
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Location: Inside the Matrix

PostPosted: Fri Dec 14, 2007 8:48 pm    Post subject:
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Hello,

I believe your requirement is understood.

Quote:
I am getting stucked as i am getting copybook name at runtime
Yes, this will probably be the most difficult part of getting your tool to do what you want.

It is far from trivial to "compile" a copybook on the fly in some user applicaton code (which is what your tool is).
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TG Murphy

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Joined: 23 Mar 2007
Posts: 149
Location: Ottawa Canada

PostPosted: Wed Dec 19, 2007 12:33 am    Post subject:
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What you are trying to do is very ambitious. Do NOT let us dissuade you as there will always be people who say that something cannot be done.

However, as you spend time and effort on this keep an eye on whether you are achieving your objectives.

Sometimes simple/specific is better than complex/generic.
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