COBOL Deleting Record from Fixed Length Indexed File Example

File Delete Tutorial   

Scenario - Delete the record with employee id = E0005 in fixed length KSDS file.

Input file -

Browse           MATEPK.EMPL.KSDS
Command ===>
                            Type KSDS     RBA
Key                                          Col 1
<===>----10---+----2----+----3----+----4----+--
****  Top of data  ****
E0001EMPLOYEE1     DIR       LOC1 0000100000
E0002EMPLOYEE2     MGR  DEPT1LOC1 0000080000
E0003EMPLOYEE3     MGR  DEPT2LOC2 0000075000
E0004EMPLOYEE4     TL   DEPT1LOC1 0000050000
E0005EMPLOYEE5     SSE  DEPT1LOC1 0000045000
E0006EMPLOYEE6     SE   DEPT1LOC1 0000034000
E0007EMPLOYEE7     SSE  DEPT2LOC2 0000040000
****  End of data  ****

Code -

----+----1----+----2----+----3----+----4----+----5----+
       IDENTIFICATION DIVISION.
       PROGRAM-ID. INDFLDEL.
       AUTHOR. MTH.

       ENVIRONMENT DIVISION.
       INPUT-OUTPUT SECTION.
       FILE-CONTROL.
      * EMPFILE Definition
           SELECT EMPFILE ASSIGN TO INPUT01
           ORGANIZATION IS INDEXED
           ACCESS MODE  IS RANDOM
           RECORD KEY   IS EMP-ID
           FILE STATUS  IS WS-FS1.

       DATA DIVISION.
       FILE SECTION.
      * EMPFILE structure definition 
       FD EMPFILE
           RECORD CONTAINS 47  CHARACTERS    
           BLOCK CONTAINS  470 CHARACTERS    
           DATA RECORD     IS EMPFILE-RECORD.
      * EMPFILE record structure definition  
       01 EMPFILE-RECORD.
          05 EMP-ID        PIC X(05).
          05 EMP-NAME      PIC X(14).
          05 EMP-DESG      PIC X(05).
          05 EMP-DEPT      PIC X(05).
          05 EMP-LOC       PIC X(05).
          05 EMP-SALARY    PIC 9(10).
          05 FILLER        PIC X(03).

       WORKING-STORAGE SECTION.
       01 WS-VAR.
          05 WS-FS1        PIC 9(02).

       PROCEDURE DIVISION.
      * Opening EMPFILE for reading
           OPEN I-O EMPFILE.

      * Deleting record randomly from the EMPFILE
           ACCEPT EMP-ID.
           DELETE EMPFILE 
                    INVALID KEY DISPLAY "Record not found"
                NOT INVALID KEY DISPLAY "Record deleted successfully"
           END-DELETE.

      * Closing EMPFILE
           CLOSE EMPFILE.
           STOP RUN.

Run JCL -

//MATEPKF  JOB MSGLEVEL=(1,1),NOTIFY=&SYSUID    
//* 
//STEP01  EXEC PGM=INDFLDEL
//STEPLIB  DD  DSN=MATEPK.COBOL.LOADLIB,DISP=SHR
//INPUT01  DD  DSN=MATEPK.EMPL.KSDS,DISP=SHR
//SYSOUT   DD  SYSOUT=*
//SYSIN    DD  *
E0005
/*

Output -

Record deleted successfully

File After Update -

Browse           MATEPK.EMPL.KSDS            
Command ===>
                            Type KSDS     RBA
Key 
<===>----10---+----2----+----3----+----4----+
****  Top of data  ****
E0001EMPLOYEE1     DIR       LOC1 0000100000 
E0002EMPLOYEE2     MGR  DEPT1LOC1 0000080000 
E0003EMPLOYEE3     MGR  DEPT2LOC2 0000075000 
E0004EMPLOYEE4     TL   DEPT1LOC1 0000050000 
E0006EMPLOYEE6     SE   DEPT1LOC1 0000034000 
E0007EMPLOYEE7     SSE  DEPT2LOC2 0000040000 
****  End of data  ****

Explaining Example -

In the above example:

  • Fixed length KSDS (MATEPK.EMPL.KSDS) file is used as an input file.
  • File organization is INDEXED and accessing mode should be RANDOM.
  • It deletes the record with the employee ID "E0005" directly if it exists and displays the message "Record deleted successfully".