z/OS上使用VSAM文件的示例代码

本示例代码演示如何在IBM z/OS操作系统上使用VSAM文件进行数据的读写操作，通过COBOL语言编写，使用了随机存取方式读取数据，实现了文件的打开、关闭、写入、读取等基础的操作。其中使用了IBM提供的SYSUT1等数据集，保证程序的正确运行。

IDENTIFICATION DIVISION.
PROGRAM-ID. VSAM-SAMPLE.

ENVIRONMENT DIVISION.
INPUT-OUTPUT SECTION.
FILE-CONTROL.
   SELECT VSAM-FILE ASSIGN TO SYSUT1
           ORGANIZATION IS INDEXED
           ACCESS MODE IS RANDOM
           RECORD KEY IS CLIENT-ID
           FILE STATUS IS F-CUST-ST.

DATA DIVISION.
FILE SECTION.
FD  VSAM-FILE.
01  VSAM-REC.
    05 CLIENT-ID             PIC X(10).
    05 CLIENT-NAME           PIC X(20).
    05 CONTACT-NAME          PIC X(20).
    05 ACCOUNT-AMOUNT        PIC 9(5)V99.
    05 ACCOUNT-TYPE          PIC X.

WORKING-STORAGE SECTION.
01  W-CUST-ST              PIC XX.
    88 SUCCESSFUL          VALUE '00'.
    88 END-OF-FILE         VALUE '10'.
    88 DUPLICATE-KEY       VALUE '22'.
    88 FILE-NOT-FOUND      VALUE '23'.
    88 OUT-OF-SPACE        VALUE '97'.
01  W-VSAM-REC             LIKE VSAM-REC.

PROCEDURE DIVISION.
MAIN-PARAGRAPH.
    OPEN INPUT OUTPUT VSAM-FILE.
    PERFORM READ-DATA UNTIL END-OF-FILE
    PERFORM WRITE-DATA
    CLOSE VSAM-FILE.

READ-DATA.
    DISPLAY 'READING DATA...'
    READ VSAM-FILE INTO VSAM-REC
        AT END SET END-OF-FILE TO TRUE
    END-READ.

WRITE-DATA.
    DISPLAY 'WRITING DATA...'
    MOVE '0123456789' TO CLIENT-ID
    MOVE 'IBM CHINA'   TO CLIENT-NAME
    MOVE 'Mike'        TO CONTACT-NAME
    MOVE  '1000.00'    TO ACCOUNT-AMOUNT
    MOVE 'SAVINGS'     TO ACCOUNT-TYPE
    WRITE VSAM-REC.

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