DISTINCT -SQL Function in Logical File Part 2.

http://www.experts-exchange.com/Programming/Programming_Platforms/AS400/Q_21888802.html

My Question is a Continuation of above Question.

I have Created a CL PGM
PGM                                            
DCL        VAR(&PRMASN) TYPE(*CHAR) LEN(8) +    
             VALUE('XXXXX')                  
OVRDBF     FILE(My FILE) SHARE(*YES)            
OPNQRYF    FILE((Myliob/myfile)) KEYFLD(*FILE) +
             UNIQUEKEY(*ALL)                    
CALL       PGM(mylib/rpgpgm) PARM(&PRMASN)    
CLOF       OPNID(myfile)                      
DLTOVR     FILE(myfile)                        
ENDPGM                                          

When I call RPG PGM  i am Getting this error msg

 Message . . . . :   I/O error CPF5180 was detected in file myfile (C G D F).
 Cause . . . . . :   The RPG procedure EX9003 in program mylib/rpgpgm received
   the message CPF5180 at statement 344 while performing I/O operation SETLL on
   file myfile. The actual file is mylib/myfile(myfile).                    

DO i have to do the OPNQRYF in the same RPG  or what is the PROBLEM.
TIA
MW
midwestexpAsked:
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tliottaConnect With a Mentor Commented:
Ah. I should've read your previous question first...

Consider some RPG code like (pseudo-code)

     PrvKey = *loval

     dou  EOF

         setgt  PrvKey  MyFile
         read   MyFile
                 [process record]
         PrvKey = MyFileKey
     enddo

Start with a low-value key to position at the beginning. Each time you READ a record, process it and use its key to reposition to the beginning of the next key-group with SETGT (Set greater-than PrvKey).

You shouldn't need OPNQRYF with coding like that. (But you should also be able to use OPNQRYF if we get that fixed.)

Tom
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tliottaCommented:
MW:

Please post the F-spec for the file and at least the relevant I/O statements.

Also, please post info about the key that is defined for (mylib/myfile).

The general sequence is fine. There is something that conflicts between the F-spec, the file key and the I/O.

But, I have to wonder why there is an OPNQRYF being used. It _looks_ as if you have a keyed file that allows non-unique keys and you're trying to use OPNQRYF to filter records and only present you with a single record for each key. If that's not what you're wanting to happen, please describe the result you need.

Tom
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midwestexpAuthor Commented:
F Spec:

flfext02   if   e           k disk                        
f                                     rename(extrec:ext02)

Setll Code:

c     keyasn        setll     lfext02  
c     keyasn        reade(e)  lfext02  
info about the key that is defined for (mylib/myfile):

A          R myrec                    PFILE(myfile)
A          K fld1                                    
A          K fld2

Yes Tom You are right i can do this By Simple RPG Coding , I would loke to Do this IN OPENQRY.
The Error MSG What i am getting:
Message . . . . :   I/O error CPF5180 was detected in file myfile (C G D F).
 Cause . . . . . :   The RPG procedure EX9003 in program mylib/rpgpgm received
   the message CPF5180 at statement 344 while performing I/O operation SETLL on
   file myfile. The actual file is mylib/myfile(myfile).
Thanks TOM
MW
                                   
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daveslaterCommented:
Hi
one question, if you only want on record with a key then why are you doing a SETLL and READE.

You can get this record by performing a CHAIN, there is no need to select distinct values.
If what you want is the last record witha duplicate key you have the options of LIFO (Last In First Out) on a logical.

The opnqryf solution assumed that distinct values would be retrieved into the program, but by processing the whole file ie just using a READ with-in a loop.

Dave
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tliottaCommented:
Dave:

How would you use CHAIN to get to the _next_ key? What version of OS/400 or i5/OS are we working with here?

Tom
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daveslaterCommented:
Hi
the point I was trying to make is:

To get a distinct key (ie an order header) you would use chain, but to get the lines (as there could be many) you use setll and reade.

midwestexp is trying to get a distinct value from a file that duplicates (reason unknown).

The opnqryf option I suggested would allow the program to simply

     dou  EOF

         read   MyFile
          [process record]

     enddo

No need to chain or setll.

The devil is in the detail, until we know what the desired result is it is difficult to provide the best solution.


dave
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midwestexpAuthor Commented:
Hello Dave/TOM I am sorry for the late replay , I was not working yesterday.
Here what I need to do I have a PF like this , all want to is eliminate the Duplicate value in the second key which is FLD2
it is ok to have Duplicate in FIRST KEY , I am so sorry is I did not explained you the Problem properly

A          R myrec                    PFILE(myfile)
A          K fld1                                    
A          K fld2


TIA
MW
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daveslaterCommented:
Hi
How do you want to process the file?

ie
is it the primary file where you will use the information to access other files
or
is it a seconday file ie you have the value of "fld1" and you want to get some additional information

Dave
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midwestexpAuthor Commented:
It a seconday file

THANKS
MW
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daveslaterCommented:
Hi
what information do you need from the file and does that information exist in all the duplicate records?

Dave
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midwestexpAuthor Commented:
Hi Dave , I have LF  having 2 KEYS , FLD1 and FLD2
both the keys are having the Duplicate values , all I want to do is when I am reading that file from the RPG PGM
I would like to to read With the FLD1 as the key and all I want to see the FLD2 is only unique Values.

TIA
MW
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daveslaterCommented:
Hi
you would need to use code (as per what Tom supplied above).
To use the OPNQRYF option you would need to use that as the primary file.

The database will not allow the option of setll / reade on the queried file when summised by unique key.

sometimes we need to program round things

Dave
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midwestexpAuthor Commented:
Thanks Dave/Tom

MW
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