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Dynamic file name issue

 
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shankarm

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PostPosted: Tue Jul 03, 2012 9:02 pm    Post subject: Dynamic file name issue
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Hello,

I am trying to pass a dynamically created file to my application program through JCL as 'DD DSN=ABC.D*.XYZ'

* - can be anything no julian date or any date stamp, I am not supposed to use REXX.

How can i achieve this? Please suggest.
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dick scherrer

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PostPosted: Tue Jul 03, 2012 9:08 pm    Post subject:
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Hello,

I probably misunderstand, but one way to do what i believe you want is to put the job in a cataloged PROCedure and make the D* a symbolic parameter to be specified at run time.
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shankarm

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PostPosted: Tue Jul 03, 2012 9:36 pm    Post subject:
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As i said D* is dynamic. i will not know the value of D*.
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shankarm

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PostPosted: Tue Jul 03, 2012 9:39 pm    Post subject:
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i tried repro infile(abc.d*.xyz) outfile(sysut2) but it is not working...
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shankarm

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PostPosted: Tue Jul 03, 2012 9:45 pm    Post subject:
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My requirement is,

A customer will FTP a file to mainframe.
After the file is FTP'ed my job should process the records.

Note: File name is ABC.D*.XYZ.

As d.sch suggested in the previous post, i cannot use the symbolic parameter. D* changes every time when the file is FTP'ed.

This is supposed to be an automatic process, i am not supposed to run the job overriding the symbolic parameter everytime.

I cannot use REXX, Internal JCL also.. Anything else is possible?
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Robert Sample

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PostPosted: Tue Jul 03, 2012 9:52 pm    Post subject:
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First: JCL is fixed once it goes through the converter / interpreter phase of JES (after the job is submitted, in other words). From that point forward, the JCL cannot be changed in any way, shape, style, or fashion -- hence if you mean your JCL is supposed to be changed to reflect the actual data set name WHILE THE JOB IS RUNNING, this cannot be done, at all, ever -- period.

Second, dynamic allocation is supported in a variety of way -- SVC call, Assembler code, or use of BPXWDYN for COBOL and other languages. Dynamic allocation does not change the JCL but does allow a DD name to be allocated while a job is running. The data set name, however, must be known when the dynamic allocation is done.

Given these two points, try to explain exactly what it is you are attempting to accomplish, especially these points:
1. When do you know the data set name?
2. If you cannot use REXX, what can you use?
3. Is this a homework assignment?
4. What do you need to do with the data set once it is allocated -- read? write? both?
5. Is the data set on tape?
6. Is the data set non-sequential?
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dbzTHEdinosauer

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PostPosted: Tue Jul 03, 2012 9:57 pm    Post subject:
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well, since we are so clever as to create unique dataset names everyday,
how about the ftp job also send a member to the jcl include library,
containing the dsn?

i mean using gdg's would make all this hocus-pocus pc bs moot,
but since this seems to be one of the more advanced sites,
where they know better, good luck.
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dick scherrer

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PostPosted: Tue Jul 03, 2012 10:01 pm    Post subject:
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Hello,

Quote:
As d.sch suggested in the previous post, i cannot use the symbolic parameter. D* changes every time when the file is FTP'ed.
Saying that you cannot does not make this true. . .

Something has to know (or discover) the actual dataset name or the process is not going to run. Also, the D* is not workable as there may be lots of old files that match the same dataset name pattern.

Why did someone believe this was a proper implementation?

Is there any reason the file cannot be simply a new generaton of a GDG?
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shankarm

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PostPosted: Tue Jul 03, 2012 10:35 pm    Post subject:
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My requirement is,

A customer will FTP a file 'ABC.D*.XYZ' to mainframe and the customer is requesting me to process the records after it is FTP'ed.

I will set the job and move to production, after that i dont have control over the job run. so, i cannot override D* (symbolic parameters) everytime before i run the job.

D* is customer ID - it is a 6 digit value. Any customer can FTP the file so the 6 digit value changes dynamically. This is unpredictable, the customer will FTP the file at 11 AM daily and i will schedule the job to run at 12.

After the file is processed, my process have to delete the file. so in most cases there will be only one file in the name mentioned above.
Two or three in case of production delays.

This is the requirement from client and he i not ready to change it.

I am going to read the file sequentially. This will not be a tape. My implementation team says i should not use REXX and internal JCL's.
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shankarm

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PostPosted: Tue Jul 03, 2012 10:36 pm    Post subject:
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if there are more than one files selected in ABC.D*.XYZ then the job should fail.
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enrico-sorichetti

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PostPosted: Tue Jul 03, 2012 10:41 pm    Post subject: Reply to: Dynamic file name issue
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why not involve the cognizant experts,
since they provide IT consulting services, why not use them icon_cool.gif
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shankarm

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PostPosted: Tue Jul 03, 2012 10:47 pm    Post subject:
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Every expert is suggesting REXX which am not supposed to use.. icon_biggrin.gif
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dick scherrer

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PostPosted: Tue Jul 03, 2012 11:47 pm    Post subject:
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Hello,

How would rexx help determine the "magic" value?

How many customers might submit a file like this each day?

Neither Rexx not JCL is a silver bullet that will resolve unknowns. . .

Is there any business reason the process cannot create a new generation of a GDG?
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David Robinson

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PostPosted: Wed Jul 04, 2012 12:36 pm    Post subject:
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What scheduler do you use? If it's TWS, you can use dataset triggering and pass in the name of the triggering dataset as a JCL variable.

I daresay other schedulers offer similar functionality.
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shankarm

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PostPosted: Wed Jul 04, 2012 2:28 pm    Post subject:
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REXX LISTCAT would resove this correct?
will return an array (stem) if the length is more than 1 then there are more than one files selected....

Every day a customer will submit a file... (only one file everyday)..

we use CTRL-M for scheduling...

Customer says there are busines reasons and he cannot alter the existing process...

I have explained the technical difficulty to my implementation team... if they approve REXX than my issue is resolved....
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Akatsukami

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PostPosted: Wed Jul 04, 2012 7:26 pm    Post subject:
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Taking a bit of a hike around Robin Hood's barn...

In step 1 execute IDCAMS LISTCAT and allocate SYSPRINT to a temporary data set. In step 2 parse that data set in a program (I'd use PL/I, but you don't list it in your profile; I expect that it can be done in COBOL) and determine if there is more than one customer data set, setting the return code appropriately. In step 3a (return code = one data set), do the desired business processing; in steps 3b (return code > one data set) and 3c (return code = zero data sets -- mustn't forget that), do the desired error processing.
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shankarm

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PostPosted: Wed Jul 04, 2012 9:11 pm    Post subject:
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Good idea... I will try this... thanks..
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Anuj Dhawan

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PostPosted: Thu Jul 05, 2012 1:43 pm    Post subject:
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What John says, I was trying it yesterday and found it that with z/OS 1.11
Code:
LISTCAT ENT('HLQ.F*.FILE') ALL
ends in
Code:
LISTCAT ENT('HLQ.F*.FILE') ALL     
IDC3012I ENTRY HLQ.F* NOT FOUND     
IDC3007I ** VSAM CATALOG RETURN CODE IS 8
IDC1566I ** HLQ.F*.FILE NOT LISTED   
IDCAMS  SYSTEM SERVICES                 

And that is kind of Data-set name you provided in the very forst of yours. However, this worked
Code:
LISTCAT ENT('HLQ.*.FILE') ALL

but this leads to make sure that for a given day the ONLY DSN of type "HLQ.*.FILE" is the DSN-of-your-interest otherwise you'll screw the jobs.
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shankarm

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PostPosted: Thu Jul 05, 2012 5:41 pm    Post subject:
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I got approval from my implementation team for rexx.. below is the code and is working.. Thank you all for your excellent suggestions....

I am posting this code for others to use in future...

Code:

PARSE ARG FILENAME                       
SAY 'FILENAME : ' FILENAME               
X = OUTTRAP(FILELIST.)                   
"LISTCAT LEVEL ("FILENAME")"             
X = OUTTRAP(OFF)                         
TOTAL = FILELIST.0                       
IF RC >  04 THEN                         
DO                                       
     SAY 'ERROR ERROR ERROR!!!!!!!!!!!!'
     SAY 'FILE NOT FOUND               '
     RC=16                               
     EXIT                               
END                                     
IF TOTAL = 2 THEN                       
  DO                                     
     PARSE VAR FILELIST.1 VAR1 VAR2 VAR3
     VAR3 = STRIP(VAR3)                 
     CARD.0=3                           
     CARD.0=3                             
     CARD.1 ='REPRO -'                     
     CARD.2 ='INFILE('|| VAR3 ||') -'     
     CARD.3 = 'OUTFILE(OUTDD)'             
     SAY '*****************************'   
     SAY CARD.1                           
     SAY CARD.2                           
     SAY CARD.3                           
     SAY '*****************************'   
     'EXECIO * DISKW CARD(FINIS STEM CARD.'
  END                                     
ELSE                                       
  DO                                       
     SAY 'ERROR ERROR ERROR!!!!!!!!!!!!'   
     SAY 'MORE THAN ONE FILE FOUND     '   
     RC=08                                 
  END                                     


JCL below....
File name:XXX.YYYYYY.*.TEST11

Code:

//XXXNDREX JOB ('****************************'),     
//    JOBCARD,CLASS=2,MSGCLASS=H,NOTIFY=&SYSUID     
//STEPRUN  EXEC PGM=IKJEFT01                         
//SYSEXEC  DD DSN=XXXND.B2B.USCHINA.PROCDATA,DISP=SHR
//SYSOUT   DD SYSOUT=*                               
//INPUT    DD DSN=XXXND.B2B.USCHINA.PROCDATA,DISP=SHR
//CARD     DD DSN=XXXES.TEST.TESTWER,DISP=SHR       
//SYSTSPRT DD SYSOUT=*                               
//SYSTSIN  DD *                                     
 %TEST123  XXX.YYYYYY.*.TEST11                       
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dick scherrer

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PostPosted: Thu Jul 05, 2012 7:11 pm    Post subject: Reply to: Dynamic file name issue
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Good to hear it is working - thank you for posting your solution icon_smile.gif

d
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