Is DSN can be verified through cobol

veena_nagesh2002 · Posted: Wed Mar 19, 2008 12:25 pm

can we verify a dataset through the cobol pgm(whether it is available or not ) and also the file attributes can be retrieved or not. if so please provide me the sample code.

Anuj Dhawan · Posted: Wed Mar 19, 2008 1:41 pm

Hi,

If you READ a DSN & status-code is 35, then it means DSN doesn't exist, not sure how to check for attributes using COBOL. However, there are better methods than using a COBOL program to check for existance (non-existance) of a DSN.

veena_nagesh2002 · Posted: Wed Mar 19, 2008 4:38 pm

is there any way to identify since its is a ims db pgm

ex : listcat

UmeySan · Posted: Wed Mar 19, 2008 4:47 pm

Hi !
...and also the file attributes can be retrieved or not ???

==> For that, best is to call a Assembler Sub-Programm which will do that by using IHADCB ControlBlock Macro:

USING IHADCB,R11
L R11,=A(S3OLD) ...This is the File
IF DCBOFLGS,Z,DCBOFOPN,TM
THEN C='DCB IS NOT ALREADY OPEND'
OPEN ((R11),INPUT) ...open DCB
LH R7,DCBLRECL ...get LRECL
LH R8,DCBBLKSI ...get BLKSIZE
EIF

Regards, UmeySan

dbzTHEdinosauer · Posted: Wed Mar 19, 2008 4:52 pm

veena_nagesh2002,

keep in mind, any dsn you mention in your jcl that does not exist and the disp indicates that the ds should exist (old,shr) will cause the jcl to fail and the job will not run - which is a pretty good indicator of the existance of a ds.

so unless you are doing dynamic allocation - in which case your cobol program can react to the return code - you need the dataset to exist.

veena_nagesh2002 · Posted: Wed Mar 19, 2008 5:10 pm

sorry, i think you are not clear with my query

I have an online pgm which is in IMSDC, based on the inputs in this screen my imscobol pgm will collect the information and

validates it and finally writes into IMSDB database. note : in one of the inputs the user will specify the file name which

can be 1 to 44 char. I would like to validate the dataset which the user is provided in the online screen through the

exisiting pgm at validation part. here is not concept of JCL or select statements

kindly help me on this

enrico-sorichetti · Posted: Wed Mar 19, 2008 5:17 pm

UmeySan · Posted: Wed Mar 19, 2008 5:28 pm

Hi !

For that, you cann call DSINFO (ispf-Service) and test the return fields.
An IBM-Apar has to be installed at your system for correct use.

Plse look: www-1.ibm.com/support/docview.wss?uid=isg1OA01530

Regards, UmeySan

enrico-sorichetti · Posted: Wed Mar 19, 2008 5:35 pm

I would go for a standard, mantained IBM safe approach

check on how to use the IGGCSI00 from a cobol program
or thru an assembler stub

IGGCSI00 is the standard module for the Catalog Search Interface

http://www.redbooks.ibm.com/redbooks/pdfs/sg245594.pdf

UmeySan · Posted: Wed Mar 19, 2008 6:15 pm

Hi Enrico !

What do you think is a DSINFO-CALL. It's just an other IBM standard-call.
So, if you prefere the Catalog Search Interface, you just use a sms-interface. It's just a component of DFSMS.

In Cobol, using DSINFO its just one simple call ant then test RC if zero or not.

PROCEDURE DIVISION.

Move 'DSINFO' to SERVICE
Move 'BlaBlaBla' to DATAID
CALL 'ISPLINK' USING SERVICE DATAID.

I used CSI in assembler a time ago and i had to provide a hudge numer of fileds. Perhaps i did something wrong. So plse be so kind and just post a little example, so i could see, what i did wrong.

Regards & buona Pasqua !!!
UmeySan

Devzee · Posted: Wed Mar 19, 2008 8:10 pm

UmeySan · Posted: Wed Mar 19, 2008 8:24 pm

Hi Devzee !

Question was: can we verify a dataset through the cobol pgm(whether it is available or not )

...or did i missunderstood something ???

Mfg, UmeySan

enrico-sorichetti · Posted: Wed Mar 19, 2008 11:00 pm

You just lost track of one post

Devzee · Posted: Thu Mar 20, 2008 11:48 am

Hi UmeySan,

Please see the 3rd post of the requestor which has requirement details.