| View previous topic :: View next topic |
| Author |
Message |
Hilltop
Beginner
Joined: 14 Oct 2004
Posts: 62
Topics: 21
|
 Posted: Thu Oct 14, 2004 2:55 pm Post subject: GDG allocate problem |
 |
|
Hello,
I am new to this forum. I tried to allocate GDG current version in REXX and it is giving me RC 12. Could you please help.
Also after successful allocation, Is there any way to read from middle of the file instead using * in "EXECIO * DISKR INPUT( STEM IN. FINIS " . I know you can mention number to read from that line onwards.
Thanks.  in advance. |
|
| Back to top |
|
 |
superk
Advanced
Joined: 19 Dec 2002
Posts: 684
Topics: 5
|
| Posted: Thu Oct 14, 2004 3:21 pm Post subject: |
|
|
Hilltop, first of all, don't add a new subject to the end of another exising discussion. This should be opened as a new discussion.
First, you said
| Quote: |
I tried to allocate GDG current version in REXX and it is giving me RC 12.
|
I know of no REXX function or facility for allocating DD's. That process is handled by other environments. If the REXX is running in a batch environment (PGM=IRXJCL or PGM=IKJEFT0x), then the DD's are usually allocated within the JCL. If this is the case, then the JCL should be able to handle the GDG current generation dataset allocation easily:
| Code: |
//STEP0001 EXEC PGM=IRXJCL,PARM='%MYREXX'
//SYSPROC DD DISP=SHR,DSN=MY.REXX.PDS
//SYSTSPRT DD SYSOUT=*
//SYSTSIN DD DUMMY
//INFILE DD DISP=SHR,DSN=MY.GDG(0)
|
If the REXX is running in a TSO/E environment, then the TSO "ALLOCATE" command can be used to allocate a DD statement. For a GDG, you would need to use the absolute generation number:
| Code: |
"ALLOC DD(INFILE) DA('MY.GDG.G0002V00') SHR REU"
|
|
|
| Back to top |
|
|
superk
Advanced
Joined: 19 Dec 2002
Posts: 684
Topics: 5
|
| Posted: Thu Oct 14, 2004 3:35 pm Post subject: |
|
|
For the second part of your question, if you know the number of records, you can divide that number by 2, and start reading from that point:
| Code: |
/* REXX */
/ * reccnt is the total number of records */
. . .
halfway = reccnt % 2
"EXECIO * DISKR DDNAME "halfway" (STEM stemarray. FINIS"
. . .
|
|
|
| Back to top |
|
|
Hilltop
Beginner
Joined: 14 Oct 2004
Posts: 62
Topics: 21
|
| Posted: Thu Oct 14, 2004 4:52 pm Post subject: |
|
|
Thanks Mr SuperK for your quick response.
from your response I came to know there is no way to ALLOC a current generation dataset in REXX. I was spending couple of days in searching for some kind of command to do that. Thanks again. |
|
| Back to top |
|
|
kolusu
Site Admin
Joined: 26 Nov 2002
Posts: 12372
Topics: 75
Location: San Jose
|
| Posted: Thu Oct 14, 2004 6:25 pm Post subject: |
|
|
Hilltop,
| Quote: |
from your response I came to know there is no way to ALLOC a current generation dataset in REXX. I was spending couple of days in searching for some kind of command to do that.
|
Not exactly true. The following exec will successfully allocate the current generation
| Code: |
/* REXX*/
GDG_NAME = 'YOUR GDG BASE'
CALL OUTTRAP DSLIST.
ADDRESS "TSO"
"LISTCAT ENT('"GDG_NAME"') ALL"
CALL GET_GDG_VER
IF RC=0 THEN DO
/* DISPLAY THE FULL NAME OF CURRENT VERSION */
SAY 'THE CURRENT GEN IS : ' CURR_GEN
/* ALLOCATE THE CURRENT VERSION */
CALL ALLOC_CURR_GDGVER
IF RC > 0 THEN DO
SAY 'ALLOCATION FAILED FOR : ' CURR_GEN
SAY 'THE RETURN CODE IS : ' RC
END
END
GET_GDG_VER:
/* THIS ROUTINE GETS THE CURRENT VERSION FOR THE GDG BASE*/
/* READ THE TRAPPED OUTPUT OF LISTCAT BACKWARDS*/
DO L = DSLIST.0 TO 1 BY -1
IF SUBSTR(DSLIST.L,4,12) = 'NONVSAM ----' THEN DO
GDGGEN = SUBSTR(DSLIST.L,34,8)
CURR_GEN = GDG_NAME||'.'||GDGGEN
CURR_GEN = STRIP(CURR_GEN)
RETURN
END
END
ALLOC_CURR_GDGVER :
/* ROUTINE TO ALLOCATE CURRENT VERSION OF GDG */
ADDRESS TSO
"ALLOC DSNAME('"CURR_GEN"') F(INDD) SHR REUSE"
RETURN
|
Hope this helps...
Cheers
Kolusu
_________________
Kolusu
www.linkedin.com/in/kolusu |
|
| Back to top |
|
|
|
|
|
FAQ
Search
Quick Manuals
Register
Profile
Log in to check your private messages
Log in
