处理z/OS上的VSAM文件：随机访问和更新记录

本示例代码演示了如何在z/OS操作系统上使用COBOL编程语言处理VSAM文件。通过该代码，可以实现对VSAM文件的随机访问和更新记录的功能。通过使用COBOL的文件控制块和关键字，我们能够有效地实现对VSAM文件的读取和写入操作。

```cobol IDENTIFICATION DIVISION. PROGRAM-ID. RandomAccessVSAM. DATA DIVISION. FILE SECTION. FD VSAM-FILE LABEL RECORDS ARE 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 "Record not found." NOT INVALID KEY DISPLAY "Employee Name: " EMPLOYEE-NAME DISPLAY "Employee Salary: " EMPLOYEE-SALARY. CLOSE VSAM-FILE.

OPEN OUTPUT VSAM-FILE. MOVE 54321 TO EMPLOYEE-ID. MOVE "John Doe" TO EMPLOYEE-NAME. MOVE 75000.50 TO EMPLOYEE-SALARY. WRITE VSAM-FILE INVALID KEY DISPLAY "Error writing record." NOT INVALID KEY DISPLAY "Record written successfully." CLOSE VSAM-FILE.

免责申明：文章和图片全部来源于公开网络，如有侵权，请通知删除 server@dude6.com