在z/OS环境下使用VSAM文件的方式

本示例展示如何在z/OS环境下使用VSAM文件。通过使用COBOL程序和JCL文件，您可以对VSAM文件进行读取、写入和更新操作。

/*

*****************************************************************
*                                                               *
*           Sample COBOL Program to access VSAM                  *
*                                                               *
*****************************************************************

*/

       IDENTIFICATION DIVISION.
       PROGRAM-ID. VSAMFILE.
       ENVIRONMENT DIVISION.
       INPUT-OUTPUT SECTION.
       FILE-CONTROL.
       SELECT VSAM-FILE
       ASSIGN TO VSAM
       ORGANIZATION IS
       INDEXED
       ACCESS MODE IS
       DYNAMIC  
       RECORD KEY IS KEY-NAME.

       DATA DIVISION.
       FILE SECTION.
       FD  VSAM-FILE
       DATA RECORD
       IS
       KEY-NAME                           PIC X(10).
       01  FIELD-NAME.

       WORKING-STORAGE SECTION.
       01  ERROR-INDICATOR         PIC XX.
           88 EOF-INDICATOR       VALUE "10".
           88 IO-ERROR-INDICATOR  VALUE "20".

       PROCEDURE DIVISION.
       BEGIN-PROCESS.
           OPEN I-O VSAM-FILE
           READ VSAM-FILE
               INVALID KEY DISPLAY "FILE NOT FOUND"
           END-READ
           IF EOF-INDICATOR
               DISPLAY "END OF FILE"
           ELSE
               DISPLAY FIELD-NAME
           END-IF
           CLOSE VSAM-FILE
           STOP RUN.

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