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Need to generate a comparison report between two files

 
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Sqlcode
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PostPosted: Thu Apr 23, 2009 12:24 pm    Post subject: Need to generate a comparison report between two files Reply with quote
I was going through below mentioned post and I have similar requirements to compare 2 file and generate report of differences.

http://www.mvsforums.com/helpboards/viewtopic.php?t=10459&highlight=compare


I am trying to understand logic here in steps? Could someone please explain logic so that I can modify this solution for different requirement?

The points I am looking for are :
1) What if I am looking for differences in multiple fields?
2) Is it possible to track changes in multiple fields?


Thanks,
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kolusu
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PostPosted: Thu Apr 23, 2009 12:58 pm    Post subject: Reply with quote
Sqlcode,

which solution are you referring to?

Either way why don't you post a sample input and desired output along with DCB properties?
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kolusu
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PostPosted: Thu Apr 23, 2009 1:00 pm    Post subject: Reply with quote
Sqlcode,

which solution are you referring to?

Either way why don't you post a sample input and desired output along with DCB properties?

You can match multiple fields , you can concatenate all the fields you want to compare as a single string and then compare it

or you can check each field individually
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Sqlcode
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Joined: 15 Dec 2006
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PostPosted: Thu Apr 23, 2009 1:15 pm    Post subject: Reply with quote
I am referring to DFSORT solution.


KEY FIELDS & THEIR DATA TYPES ALONG WITH POSITION
Code:

ID                      Amount                       STAGE-1            STAGE-2       
S9(12) COMP-3           S9(07)V99 COMP-3             CHAR(5)            CHAR(5)         
POS: 23-29              POS:402-406               POS:542-546      POS:547-551   
------------------------------------------------------------------------------------------------



1. LRECL 1000 and RECFM =FB.
2. Key is unique in both the files.

Fields to be reported for change.

Code:

FLAG-1                                FLAG-2
CHAR(1)                               CHAR(1)
POS:101-101                           POS:102-102
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kolusu
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PostPosted: Thu Apr 23, 2009 3:50 pm    Post subject: Reply with quote
Sqlcode,

The following DFSORT JCL will give you the desired results.

I used these codes to denote the changes


Code:

NC  = No Change ie. ID,AMOUNT,STAGE-1,STAGE-2 all match
CR  = Change record i.e id matches but one of AMOUNT,STAGE-1,STAGE-2 doesnt match
NA  = New Add ie no matching key in file 2
ND  = New Delete i.e No matching key in file 1


The logic is quite simple

1. Put a header so as to identify from which file the record came from. Use group function to put a ID in pos 1017.

2. Now if it is from file 2 we put the contents of amount, stage1 and stage-2 in pos 1001.

3. Now sort on the key

4. Sum the contents in pos 1001 and also the ID

5. If there is a match key record the sum will be 3 and now we can compare the 2 records
6. If they dont match the sum will be either 1 or 2. if 1 then it is from file 1 and if 2 then it is from file 2.

Code:

//STEP0100 EXEC PGM=SORT
//SYSOUT   DD SYSOUT=*
//SORTIN   DD DSN=1000 byte header record,DISP=SHR
//         DD DSN=1000 byte input file1,DISP=SHR
//         DD DSN=1000 byte header record,DISP=SHR
//         DD DSN=1000 byte input file2,DISP=SHR
//SORTOUT  DD SYSOUT=*                                             
  OPTION EQUALS                                                     
  INREC IFTHEN=(WHEN=INIT,OVERLAY=(1001:16Z)),                     
  IFTHEN=(WHEN=GROUP,BEGIN=(1,6,CH,EQ,C'HEADER'),PUSH=(1017:ID=1)),
  IFTHEN=(WHEN=(1017,1,ZD,EQ,2),OVERLAY=(1001:402,5,542,10))       
  SORT FIELDS=(023,7,PD,A)                                         
  SUM FIELDS=(1001,8,BI,                                           
              1009,8,BI,                                           
              1017,1,ZD)                                           
  OUTFIL IFOUTLEN=1000,OMIT=(1,6,CH,EQ,C'HEADER'),                 
  IFTHEN=(WHEN=(1017,1,ZD,EQ,1),OVERLAY=(101:C'NA')),               
  IFTHEN=(WHEN=(1017,1,ZD,EQ,2),OVERLAY=(101:C'ND')),               
  IFTHEN=(WHEN=(1017,1,ZD,EQ,3,AND,                                 
                0402,5,PD,EQ,1001,5,PD,AND,                         
                0542,5,CH,EQ,1006,5,CH,AND,                         
                0547,5,CH,EQ,1011,5,CH),                           
  OVERLAY=(101:C'NC')),                                             
  IFTHEN=(WHEN=(1017,1,ZD,EQ,3,AND,                                 
                0402,5,PD,NE,1001,5,PD,OR,                         
                0542,5,CH,NE,1006,5,CH,OR,                         
                0547,5,CH,NE,1011,5,CH),                           
  OVERLAY=(101:C'CR'))                                             
/*

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