处理z/OS中VSAM文件的随机访问示例

本示例代码演示了如何在z/OS操作系统中使用COBOL编程语言实现对VSAM（Virtual Storage Access Method）文件的随机访问。VSAM是一种高性能文件存储和检索系统，常用于z/OS平台上。

IDENTIFICATION DIVISION.
PROGRAM-ID. RandomAccessVSAM.

DATA DIVISION.
FILE SECTION.
FD VSAM-FILE.
01 VSAM-RECORD.
   05 EMPLOYEE-ID    PIC 9(5).
   05 EMPLOYEE-NAME  PIC X(20).
   05 EMPLOYEE-SALARY PIC 9(7)V99.

WORKING-STORAGE SECTION.
01 EMPLOYEE-KEY PIC 9(5) VALUE 12345.

PROCEDURE DIVISION.
   OPEN I-O VSAM-FILE.
   READ VSAM-FILE
      INVALID KEY
         DISPLAY "Record not found."
      NOT INVALID KEY
         DISPLAY "Employee ID: " EMPLOYEE-ID
         DISPLAY "Employee Name: " EMPLOYEE-NAME
         DISPLAY "Employee Salary: " EMPLOYEE-SALARY
   END-READ.

   MOVE 67890 TO EMPLOYEE-SALARY.
   REWRITE VSAM-RECORD
      INVALID KEY
         DISPLAY "Error updating record."
      NOT INVALID KEY
         DISPLAY "Record updated successfully."
   END-REWRITE.

   CLOSE VSAM-FILE.

STOP RUN.

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