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Nandakumar.B
New User
Joined: 09 Oct 2005
Posts: 1
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hi,
I have a doubt regarding handling three files simultaneously inside a cobol program.The program has to generate a report using the three files and these files have the same key.But the records in the files do not have a one to one correspondence.How can we handle them efficiently outside the program ie in a JCl so as to minimize the complexity of the logic? |
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Sridevi_C
Active User
Joined: 22 Sep 2005
Posts: 104
Location: Concord, New Hampshire, USA.
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Hi,
You can SORT and MERGE in JCL. Duplicates, if any and if you need to eliminate SUM FIELDS = NONE can be used.
Regards,
Sridevi. |
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mmwife
Super Moderator
Joined: 30 May 2003
Posts: 1592
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You didn't say how the rpt was to be written. If all 3 recs are needed to generate a rpt line you can do something like this, provided all 3 files are sorted on the same key.
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Do a priming read of all 3 files.
Perf process-rpt until eof on any file
In process-rpt:
check for all 3 keys equal and save hi key
evaluate true
when 3 keys equal
perf print rpt line
perf read 3 files
when key1 < hi key
perf read file1
when key2 < hi key
perf read file2
when key3 < hi key
perf read file2
end-eval
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P.S. This approach will work for 3 or more IP files. |
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