John,
There *MAY* be a way, albeit adding an extra step to do so.
But I don't think that is what he wanted.
Ed
On Feb 11, 2016, at 7:34 AM, John McKown wrote:
On Wed, Feb 10, 2016 at 6:08 PM, Lester, Bob
<bles...@ofiglobal.com> wrote:
Hi Folks,
OK, it's only Wednesday, but....
Wouldn't it be nice if you could code:
//SOMEDD DD DSN=SOME.PDS.DSN,DISP=SHR
...and it would read all the members in order? Maybe even
any order
you specify?
Maybe (ducking!) like it works with GDGs when you specify the
base
only?
Am I crazy before Friday?
Thanks!
BobL
​Well, most of the time when a DD is coded like that, it means
that the
program involved is most likely going to be using BPAM to process
separate
members (like COBOL with copybooks or HLASM with COPY or macros). So,
unlike GDGs, the access method would need to have special coding. In
particular, when doing an OPEN with a DCB which has DSORG=PO, then the
"system" could not do your processing. So, the BSAM/QSAM access method
would need to do something like "if I open a DCB with DSORG=PS, and
the DSN
is actually PO, then set up to read each member in order". But
wait! There
is a problem There is a _lot_ of code which already does an OPEN of
a PO
data set with a DCB with a DSORG=PS in it. In fact, that is a
_documented_
way to read the directory of the PDS as if it were a data sets. And
this
process even works with PDSE libraries.
Well, I think this should explain why what you are desiring is
actually
impossible. It would destroy existing code, horribly. Perhaps a new
JCL
format?
//SOMEDD DD DSN=SOME.PDS.DSN(*),DISP=SHR
which could lead to other "wildcards" such as SOME.PDS.DSN(A*) to get
everything which starts with A. Or SOME.PDS.DSN(*A) for all member
which
_end_ in A. Or SOME.PDS.DSN(*A*) for members which have an "A" in the
anywhere. Now we're cooking with fire! But wait! There's more! How
about
making the "pattern" be a "glob" (
https://en.wikipedia.org/wiki/Glob_(programming) ) for even better
pattern
matching. OK, we're using a gas range with an hibachi. And lastly,
for a
plasma flame crowd, let's go all the way and use EREs! (Extended
Regular
Expressions). Now all we need to determine is _when_ to generate
the list
of member names? I would suggest at OPEN time. The next thing that
somebody
would want is some sort of way to determine when the program started
reading a new member and what the member name is that we just start
(are
currently) reading is.
--
The man has the intellect of a lobotomized turtle.
Maranatha! <><
John McKown
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