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  1.  Home
  2. COBOL400-L
  3. July 2002

RE: Subfiles in COBOL

> From: Joe Pluta
>
> In any event, my firt subfile program is working, although I'm having some
> real problems with READ NEXT MODIFIED.  I'll post more as I get time.

Come, look, read, laugh!  See the silly newbie as he gets fancy and COBOL
syntax bites him on the bum!

This works:

   03  SFL1-STATUS     PIC 1.
     88  SFL1-HAS-MORE-RECORDS         VALUE B"0".
     88  SFL1-IS-AT-END                VALUE B"1".

   SET SFL1-HAS-MORE-RECORDS TO TRUE
   PERFORM READ-SUBFILE THROUGH READ-SUBFILE-END
      UNTIL SFL1-IS-AT-END

It does NOT work when the "SET" is in the READ-SUBFILE paragraph.  Well, it
works the first time, and then from then on no records are ever read from
the subfile.  As I found out, this is because the default for "UNTIL" is
"TEST BEFORE", a leading comparison.

<sigh>

One of these days, I may get the hang of this.

Joe

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