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A couple of conflicting messages from the V5R1 memo to users (It's on IBM's
website.)
Programming considerations
Output file changes
Changes made to output files for the V5R1 release may affect your
applications.
When fields are added to the end of the previous record format, you should
specify no level checking (LVLCHK(*NO)) so your applications run the same
as
they did previously.
...
Command and API changes
QMAXSPLF and WRKSPLF changes
The use of output files QAPTACG4 (field JASPNB), QASYSFJ4 (field SFSNUM),
and QSYPOJ4 (field POSPLN) that contain the spooled file number might
require
application changes. In V5R1, new fields have been added to accommodate a
larger spooled file number. If the number is too large for the old field,
the old field
is set to blank and the new field should be referenced to get the number.
To
prevent the need for a change to an application, ensure that the system
value
QMAXSPLF remains set to 9999 (the default value at installation time).
Several messages have changed to include a new 4-byte message data field
that
contains the spooled file number. The old 2-byte fields that already exist
are set to
-1 when the spooled file number exceeds 32 767. Once the 2-byte field is
set to -1,
the spooled file number can be accessed through the 4-byte message field.
If you decide to use the larger fields, applications that use the open
feedback area
might require code changes. It is recommended that you use the larger
fields, but
the smaller fields can still be used.
Views 3 and 4 of the Work with Spooled Files (WRKSPLF) display have
changed.
Previously, view 3 contained the output queue name and library along with
the
spooled file number. With the increase in the spooled file number, view 3
can no
Rob Berendt
==================
A smart person learns from their mistakes,
but a wise person learns from OTHER peoples mistakes.
"Simon Coulter"
<shc@flybynight.com To: MIDRANGE-L@midrange.com
.au> cc:
Sent by: Subject: Re: Journal
receiver problems
owner-midrange-l@mi
drange.com
05/22/01 09:45 PM
Please respond to
MIDRANGE-L
e
Hello Ron (and everyone else with an opinion on this topic),
The "problem" is in how most midrange programmer's handle outfiles. They
build
permanent 'work files' and declare the work file in the processing program.
WRONG!
Here is how it is intended to work:
Outfiles are a release independant method of retrieving information. IBM
provides template files in QSYS for each of the DSPxxx commands. These
files
are created without members and with LVLCHK(*NO) specified. Using LVLCHK
(*NO)
allows IBM to add new fields at the end of the record format. They will
not
change the existing layout, they will not rename fields, they will not
change
field attributes. (If they do then generally a Rochester developer got it
WRONG
and you can APAR them.)
Your code should declare the TEMPLATE, not the work file. You issue the
DSPxxx
command specifying the desired outfile and then OVERRIDE the declared
template
to the outfile.
If you create a work file based on the template (via CRTDUPOBJ or by
running the
DSPxxx command once to create the work file) then your code will break when
the DSPxxx command is enhanced to output additional fields. You should
always
let the DSPxxx command create the outfile on EVERY run -- unless you are
using
MBROPT(*ADD) -- to avoid problems with enhanced layouts. If you (and
Rochester)
follow the rules you won't have a problem with updated outfiles.
Using the APIs avoids the issue and probably results in better performance
due
to reduced I/O but at the expense of increased complexity.
Here are some examples of correct processing of outfiles to make the point
clear:
CL
===
PGM
DCLF QADSPOBJ /*DSPOBJD outfile template */
DSPOBJD OBJ(*ALL/*ALL) OBJTYPE(*ALL) OUTPUT(*OUTFILE) +
OUTFILE(QTEMP/OBJLIST)
OVRDBF QADSPOBJ TOFILE(TQEMP/OBJLIST)
READ: RCVF
/* do stuff until end of file */
ENDPGM
RPG with CL driver
==================
PGM
DSPOBJD OBJ(*ALL/*ALL) OBJTYPE(*ALL) OUTPUT(*OUTFILE) +
OUTFILE(QTEMP/OBJLIST)
OVRDBF QADSPOBJ TOFILE(TQEMP/OBJLIST)
CALL RPGPGM
ENDPGM
FQADSPOBJ IF E DISK
C READ QLIDOBJD
C DOW NOT(%EOF(QADSPOBJ))
* Do stuff until end of file
C READ QLIDOBJD
C ENDDO
C SETON LR
C RETURN
Regards,
Simon Coulter.
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