All you need to do is open a second occurrence of your file in the Cobol
program. Copy the select and FD for the file - give them a different
name than the original occurrence then do an open for the new file name
and perform your indexed reads on the other file. This gives you a
second logical occurrence of the same file in your program and the
pointers on the original occurrence are not changed. For example:
IDENTIFICATION DIVISION.
PROGRAM-ID. TWOFILES.
ENVIRONMENT DIVISION.
CONFIGURATION SECTION.
SOURCE-COMPUTER. IBM-AS400.
OBJECT-COMPUTER. IBM-AS400.
INPUT-OUTPUT SECTION.
FILE-CONTROL.
SELECT CLAIM01 ASSIGN TO DATABASE-CLAIML01
ORGANIZATION IS INDEXED
ACCESS MODE IS DYNAMIC
FILE STATUS IS CLAIML01-ST
RECORD KEY IS EXTERNALLY-DESCRIBED-KEY.
SELECT CLAIMUP ASSIGN TO DATABASE-CLAIML01
ORGANIZATION IS INDEXED
ACCESS MODE IS DYNAMIC
FILE STATUS IS CLAIMLUP-ST
RECORD KEY IS EXTERNALLY-DESCRIBED-KEY.
DATA DIVISION.
FILE SECTION.
FD CLAIML01.
01 CLAIML01-REC.
COPY DD-ALL-FORMATS OF CLAIML01.
FD CLAIMLUP.
01 CLAIMLUP-REC.
COPY DD-ALL-FORMATS OF CLAIML01.
WORKING-STORAGE SECTION.
01 STATUS-CODES.
05 CLAIML01-ST PIC XX.
05 CLAIMLUP-ST PIC XX.
01 SWITCHES.
05 SW-EOF PIC X(01) VALUE "N".
88 END-OF-FILE VALUE "Y".
05 SW-FOUND PIC X(1) VALUE "N".
PROCEDURE DIVISION.
0000-MAIN.
PERFORM 1000-OPEN-FILES THRU 1000-EXIT.
PERFORM 2000-READ-CREATE THRU 2000-EXIT UNTIL END-OF-FILE.
PERFORM 9000-CLOSE-FILE THRU 9000-EXIT.
0000-EXIT.
GOBACK.
1000-OPEN-FILES.
OPEN I-O CLAIML01
OPEN I-O CLAIMLUP
1000-EXIT.
EXIT.
2000-READ-CREATE.
READ CLAIML01 NEXT RECORD AT END
MOVE "Y" TO SW-EOF
GO TO 2000-EXIT.
PERFORM 2400-READ-MPINS THRU 2400-EXIT.
2000-EXIT.
EXIT.
2400-READ-MPINS.
MOVE "Y" TO SW-FOUND.
MOVE CORR claimrec of CLAIML01
TO claimrec of CLAIMLUP.
READ CLAIMLUP
INVALID KEY
MOVE "N" TO SW-FOUND.
2400-EXIT.
EXIT.
9000-CLOSE-FILE.
CLOSE CLAIML01 , CLAIMUP.
9000-EXIT.
EXIT.
John Arnold
(301) 354-2939
-----Original Message-----
From: cobol400-l-bounces@xxxxxxxxxxxx
[mailto:cobol400-l-bounces@xxxxxxxxxxxx] On Behalf Of Nancy Barney
Sent: Wednesday, June 04, 2008 10:32 AM
To: cobol400-l@xxxxxxxxxxxx
Subject: [COBOL400-L] How to do sequential and random reads concurrently
I have an indexed file that I am reading sequentially using a repeating,
non-unique alternate key, using start and read next. Access is dynamic.
As I am reading through this file sequentially, I also have to randomly
retrieve records from the same file using the primary key. (For each
record that I retrieve sequentially, I have to get another record
randomly.)
I can't do a start after the random read to reset the record pointers
for the sequential read, because I am using a non-unique alternate key
to start the sequential read.
How do I do this without messing up the record pointers? When I tested
this, I don't get all the records I should get from the sequential read,
as if the random read 'resets' the record pointers.
How do I get around this? Thanks in advance for your help!
Nancy Barney
Dakota Drug, Inc
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