cobol-java-v3/benchmark-programs/09-db-update/README.md

09-db-update — Database Update Simulation

电信业务场景

客户信息DB更新。使用索引文件模拟关系数据库，实现客户信息的INSERT、UPDATE、DELETE操作。

Purpose

Simulates DB update operations (INSERT, UPDATE, DELETE) using GnuCOBOL INDEXED files as a stand-in for EXEC SQL.

Test Coverage

1. INSERT 3 records — WRITE to indexed file with STATUS check
2. Duplicate INSERT — Attempt key duplicate, expect STATUS 22
3. UPDATE — READ then REWRITE to modify an existing record
4. DELETE — READ then DELETE to remove a record
5. Verify — START + READ NEXT to read back remaining records
6. Report — Summary output to report.txt

Key Techniques

• INDEXED file with DYNAMIC access
• FILE STATUS checking (00=OK, 22=dup, 23=not found, 10=EOF)
• WRITE / REWRITE / DELETE with INVALID KEY
• START + READ NEXT for sequential traversal