Re: Substring DDS

["Peter Dow" <pcdow@xxxxxxxxx>]

Hi Raul,

Yes, it works. For example:

Physical file DDS (file name FILEA):
     A          R TESTREC                   TEXT('TEST')
     A            DATE1           L         TEXT('DATE')
     A            TIME1           T         TEXT('TIME')
     A            TSTMP           Z         TEXT('TIMESTAMP')

Logical file DDS (file name FILEB):
      A          R TESTREC1                  PFILE(FILEA)
      A            DATE1           A         DATFMT(*YYMD)
      A            TIME1           S         TIMFMT(*HMS)
      A            TSTMP           L  I
      A            DAY                I      SST(DATE1 7 2)
      A          K DAY

A field in a logical file can change the type of the corresponding field in
the physical in certain situations, the date field being one of them. This
ability was actually the subject of a white paper concerning methods of
dealing with Y2K. The idea was to take all existing PF's that contained
numeric fields used as dates, rename them and change the fields to native
date fields (type L), then create logicals with the original physical file's
name and in the logical convert all date fields back to their original
numeric definition. The CPYF command could be used to copy data from the old
physical file to the new one and would actually convert the numeric fields
to date fields as long as they had a valid date in them. Then you could
gradually convert programs to use the native date fields.

Nice idea, but in practice I think too many people had special values or
just plain invalid dates in those fields. At least, I never heard of anyone
actually using this method.

hth
Peter Dow
Dow Software Services, Inc.
909 425-0194 voice
909 425-0196 fax


From: Raul Jager <raul@abc.com.py>
> _____________________________________________________
>
> I know it works if DATA is alpha or zoned.
> Can we do this with part of a date field?  Like day?
> ____________________________________________________________


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