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mf_user
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Joined: 01 Jun 2003
Posts: 372
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PostPosted: Tue Jan 27, 2009 11:07 am    Post subject: Please explain me Reply with quote
Frank, Would you please explain me this style of coding

Quote:

HEADER1=(' INCLUDE COND=(1,1,CH,NE,1,1,CH,OR,'),
BUILD=(C' 19,6,CH,EQ,C''',1,6,C''',OR,',80:X),
TRAILER1=(' 1,1,CH,NE,1,1,CH)')


I have seen and used "INCLUDE COND=(1,1,CH,NE,C'1') or similar kind of things. But, I have not understood what you have used.

Would you please explain.

Thanks.
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MF
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Any training that does not include the emotions, mind and body is incomplete; knowledge fades without feeling.
==
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Frank Yaeger
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Joined: 02 Dec 2002
Posts: 1618
Topics: 31
Location: San Jose
PostPosted: Tue Jan 27, 2009 11:18 am    Post subject: Reply with quote
I'm just using a trick to allow generation of the control statements. For each input line, the BUILD operand generates a comparison of the form:

Code:

   19,6,CH,EQ,C'cccccc',OR,


In order to have a valid INCLUDE statement using those comparisons, we need to have:

Code:

  INCLUDE COND=(....,       <------- starting line
    build_comparison1,
    build_comparison2,
    ...
    ...)                    <------- ending line


Note that we need to surround the build_comparisons with a starting and ending line for correct syntax.

I'm using HEADER1 to generate:

Code:

   INCLUDE COND=(1,1,CH,NE,11,CH,OR,


and TRAILER1 to generate:

Code:

    1,1,CH,NE,1,1,CH)


1,1,CH,NE,1,1,CH is essentially a NOP ... it can never be true so it doesn't include any records.

We could get fancier and not use the NOPs, but that would require more coding to identify the first and last build lines. The use of NOPs is a simpler solution.
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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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mf_user
Intermediate


Joined: 01 Jun 2003
Posts: 372
Topics: 105
PostPosted: Tue Jan 27, 2009 11:42 am    Post subject: Reply with quote
wow...it is really wonderful information to know this piece of info.

Thank you.
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MF
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