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File open in "Extend" mode

 
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ashutosh_agl3
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Joined: 14 Aug 2003
Posts: 28
Topics: 15
PostPosted: Tue Aug 31, 2004 2:46 am    Post subject: File open in "Extend" mode Reply with quote
I need to open a Sequentila file for opending and am trying to do so using the "Extend" mode.

The purpose is to append file (if already there) else to create a new file.

However while refering to certain refernce manuals there is one restriction with this and it refers to some

"SELECT OPTIONAL" clause.

Could you help to get some more details as to how this can be achieved.
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kolusu
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Joined: 26 Nov 2002
Posts: 12375
Topics: 75
Location: San Jose
PostPosted: Tue Aug 31, 2004 5:55 am    Post subject: Reply with quote
ashutosh_agl3,

Quote:
The purpose is to append file (if already there) else to create a new file.


You need dynamic allocation in case the file does not exist. Why not handle this in JCL itself with IEFBR14

Code:

//STEP0100  EXEC PGM=IEFBR14
//*
//MODFILE   DD DSN=YOUR FILE IN QUESTION
//             DISP=(MOD,CATLG,DELETE),
//             UNIT=SYSDA,
//             SPACE=(TRK,(1,1),RLSE)
//             DCB=(LREC=ZZZ,RECFM=FB,BLKSIZE=0)
//*


Hope this helps...

Cheers

Kolusu
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