Sunday, 3 February 2013

COBOL Prog to read record from RRDS file

COBOL Prog to read record from RRDS file :

IDENTIFICATION DIVISION.                       
PROGRAM-ID. FILREAD.                           
ENVIRONMENT DIVISION.                          
CONFIGURATION SECTION.                         
OBJECT-COMPUTER. IBM-390.                      
SOURCE-COMPUTER. IBM-390.                      
INPUT-OUTPUT SECTION.                          
FILE-CONTROL.                                  
    SELECT INFILE ASSIGN TO DD1                
    ORGANIZATION IS RELATIVE                   
    ACCESS MODE IS RANDOM                      
    RELATIVE KEY IS WS-RRN                     
    FILE STATUS IS FS1.                        
DATA DIVISION.                                 
FILE SECTION.
                                  
FD INFILE.                                     
01 INREC.                                      
    05 EID                    PIC X(05).           
    05 FILLER             PIC X(01).           
    05 ENAME            PIC X(06).           
    05 FILLER             PIC X(01).           
    05 ESAL                 PIC 9(05).           
    05 FILLER             PIC X(62).           
WORKING-STORAGE SECTION.                       
01 FS1                          PIC X(02).           
01 WS-RRN                 PIC 9(04).           
PROCEDURE DIVISION.                            
    PERFORM OPEN-PARA.                         
    PERFORM READ-PARA.                         
    PERFORM CLOSE-PARA.                        
    STOP RUN.                                  
OPEN-PARA.                                     
    OPEN INPUT INFILE                          
    DISPLAY ' OPEN FILE STATUS ' FS1.          
    MOVE 3 TO WS-RRN

    DISPLAY ' VALUE OF WS-RRN '  WS-RRN.                         
READ-PARA.                                     
    IF FS1 = '00'                              
       READ INFILE                             

         INVALID KEY                          
           DISPLAY ' RECORD NOT FOUND '       
         NOT INVALID KEY                      
           DISPLAY
' RECORD '   INREC  
       END-READ                               
    END-IF.
                                   
CLOSE-PARA.                                   
    CLOSE INFILE                              
    DISPLAY ' CLOSE FILE STATUS ' FS1.        




JCL TO EXECUTE ABOVE PROGRAM :
//Z57658SA JOB (3P10),'RRDS EXEC JCL',                       
//         CLASS=A,                                          
//         MSGCLASS=Q,                                       
//         NOTIFY=Z57658                                     
//*                                                          
//JCL1 JCLLIB ORDER=Z57658.SOURCE.PROCLIB                    
//*                                                          
//STEP1 EXEC IGYWCLG,MEM=FILEREAD                            
//COBOL.SYSIN  DD DSN=Z57658.SOURCE.COBOL(&MEM),DISP=SHR     
//LKED.SYSLMOD DD DSN=Z57658.SOURCE.LOADLIB(&MEM),DISP=SHR   
//GO.DD1       DD DSN=Z57658.TEST.RRDS,DISP=SHR              
//GO.SYSIN     DD *                                          

//*                               


INPUT DATA FROM RRDS FILE:    
'Z57658.TEST.RRDS'                     
 RELATIVE RECORD NUMBER - 1            
 21400 SANDIP 15500                    
 RELATIVE RECORD NUMBER - 2            
 21500 MANDIP 25500                    
 RELATIVE RECORD NUMBER - 3            
 21600 RANDIP 35500                    
 RELATIVE RECORD NUMBER - 4            
 21700 BALDIP 45500                    
 RELATIVE RECORD NUMBER - 5            
 21800 KULJIT 55500                    
 RELATIVE RECORD NUMBER - 6            
 21900 ANKIT  65500                    
 RELATIVE RECORD NUMBER - 7            
 22000 NITIN  75500                    
 RELATIVE RECORD NUMBER - 8            
 22100 SAMEER 85500                                           


OUTPUT OF PROGRAM :
********************************* TOP OF DATA ***
OPEN FILE  STATUS : 00                         
 VALUE OF WS-RRN 3                               
 RECORD 21600 RANDIP 35500                       
CLOSE FILE  STATUS : 00                        

******************************** BOTTOM OF DATA *

1 comment:

  1. Hi Sandip, Can you explain how during Runtime if one wants to access a particular record from a relative file, how will one know what's the relative key for that record?

    Thanks in advance

    ReplyDelete