处理z/OS中VSAM文件的随机读写示例

这是一个用于z/OS操作系统的示例代码，演示了如何通过COBOL语言实现对VSAM（Virtual Storage Access Method）文件的随机读写操作。VSAM是z/OS上常用的文件存储管理系统，用于高效地管理大型数据集。

IDENTIFICATION DIVISION.
PROGRAM-ID. RandomAccessVSAM.

DATA DIVISION.
FILE SECTION.
FD VSAM-FILE
  LABEL RECORDS STANDARD
  VALUE OF FILE-ID IS "VSAMFILE"
  DATA RECORD IS VSAM-RECORD.

WORKING-STORAGE SECTION.
01 VSAM-RECORD.
   05 EMPLOYEE-ID    PIC 9(5).
   05 EMPLOYEE-NAME  PIC X(20).
   05 EMPLOYEE-SALARY PIC 9(7)V99.

01 VSAM-KEY.
   05 EMPLOYEE-ID-KEY PIC 9(5).

PROCEDURE DIVISION.
   OPEN INPUT VSAM-FILE.
   MOVE 12345 TO EMPLOYEE-ID-KEY.
   READ VSAM-FILE
     KEY IS EMPLOYEE-ID-KEY
     INVALID KEY
       DISPLAY "Employee not found."
     NOT INVALID KEY
       DISPLAY "Employee ID: " EMPLOYEE-ID
       DISPLAY "Name: " EMPLOYEE-NAME
       DISPLAY "Salary: " EMPLOYEE-SALARY
   END-READ.
   CLOSE VSAM-FILE.

   OPEN OUTPUT VSAM-FILE.
   MOVE 54321 TO EMPLOYEE-ID.
   MOVE "John Doe" TO EMPLOYEE-NAME.
   MOVE 75000.75 TO EMPLOYEE-SALARY.
   WRITE VSAM-RECORD
     INVALID KEY
       DISPLAY "Error writing record."
     NOT INVALID KEY
       DISPLAY "Record written successfully."
   END-WRITE.
   CLOSE VSAM-FILE.

   STOP RUN.

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