# 26-db-search — Database Search Simulation

## 电信业务场景

客户信息DB检索。使用索引文件模拟数据库检索，支持单键查询和范围查询，用于客户信息确认。

## Purpose
Simulates database search/retrieval patterns using GnuCOBOL INDEXED files with START + READ NEXT.

## Test Coverage
1. **Single key search** — READ with KEY IS for exact match retrieval
2. **Range search** — START with NOT LESS THAN, iterate until upper bound
3. **Full scan** — START from LOW-VALUES, read all records in key order
4. **Range with no results** — START with no matching records

## Key Techniques
- INDEXED file with DYNAMIC access mode
- START command for conditional positioning
- READ NEXT for sequential traversal
- KEY IS / GREATER THAN / NOT LESS THAN conditions
- FILE STATUS checking