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How to check for an empty file?

 
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kolusu
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Joined: 26 Nov 2002
Posts: 12377
Topics: 75
Location: San Jose
PostPosted: Sun Dec 01, 2002 11:13 pm    Post subject: How to check for an empty file? Reply with quote
Code:

//*-------------------------------------------------------------------*
//*  SETS RC=0000 IF DATASET HAS RECORDS                              *
//*  SETS RC=0004 IF DATASET IS EMPTY                                 *
//*-------------------------------------------------------------------*
//STEP0100 EXEC PGM=IDCAMS 
//SYSPRINT DD SYSOUT=*
//MYFILE   DD DSN=<datasetname>,
//            DISP=SHR
//SYSIN    DD *
  PRINT INFILE(MYFILE) CHARACTER COUNT(1)
/*
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Frank Yaeger
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Joined: 02 Dec 2002
Posts: 1618
Topics: 31
Location: San Jose
PostPosted: Wed Dec 04, 2002 11:43 am    Post subject: Reply with quote
You can also do this with DFSORT's ICETOOL:

Code:

//STEP1 EXEC PGM=ICETOOL
//TOOLMSG DD SYSOUT=*
//DFSMSG  DD SYSOUT=*
//IN DD DSN=...
//TOOLIN DD *
* SET RC=12 IF THE 'IN' DATA SET IS EMPTY, OR
* SET RC=0 IF THE 'IN' DATA SET IS NOT EMPTY
   COUNT FROM(IN) EMPTY
/*
// IF STEP1.RC = 0 THEN
//*** STEP2 WILL RUN IF 'IN' IS NOT EMPTY
//*** STEP2 WILL NOT RUN IF 'IN' IS EMPTY
//STEP2 EXEC ...
...
// ENDIF


For more information, see the "Set RC=12 or RC=4 if file is empty, has more than n records, etc" Smart DFSORT Trick at:

http://www.ibm.com/servers/storage/support/software/sort/mvs/tricks/
_________________
Frank Yaeger - DFSORT Development Team (IBM)
Specialties: JOINKEYS, FINDREP, WHEN=GROUP, ICETOOL, Symbols, Migration
DFSORT is on the Web at:
www.ibm.com/storage/dfsort
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