# 数据迁移：JSON 文件 → SQLite 数据库

## 迁移时间
2025年，从单人 JSON 文件存储迁移到 SQLite 数据库。

## 源结构（旧）

```
~/.hermes/data/recruitment/
├── candidates/
│   ├── a1b2c3d4e5f6.json   # 单人文件，文件名 = fingerprint(MD5前12位)
│   └── ...
└── candidates_index.json     # 索引文件，key = fingerprint
```

单人 JSON 文件结构：
```json
{
  "fingerprint": "a1b2c3d4e5f6",
  "name": "张女士",
  "age": 25,
  "education": "本科",
  "experience": "3年经验",
  "school": "郑州经贸学院",
  "expected_city": "郑州",
  "expected_salary": "5千-6千",
  "score": 22,
  "score_level": "待定",
  "greeted": false,
  "raw_text": "...",
  "education_detail": "...",
  "work_detail": "...",
  "scraped_at": "2025-01-15 14:30:00"
}
```

## 目标结构（新）

SQLite 数据库 `recruitment.db`，三表结构（见 `database-schema.md`）。

## 迁移脚本要点

```python
import sqlite3, json, os, glob

db = sqlite3.connect('recruitment.db')
# 创建表（见 database-schema.md）

candidates_dir = os.path.expanduser('~/.hermes/data/recruitment/candidates')
for fp_file in glob.glob(os.path.join(candidates_dir, '*.json')):
    with open(fp_file, 'r', encoding='utf-8') as f:
        data = json.load(f)
    
    db.execute("""
        INSERT OR REPLACE INTO candidates 
        (id, name, age, education, experience, school, expected_city, 
         expected_salary, score, score_level, greeted, raw_text,
         education_detail, work_detail, scraped_at)
        VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)
    """, (
        data['fingerprint'], data['name'], data.get('age'),
        data.get('education'), data.get('experience'), data.get('school'),
        data.get('expected_city'), data.get('expected_salary'),
        data.get('score'), data.get('score_level'),
        1 if data.get('greeted') else 0,
        data.get('raw_text', ''), data.get('education_detail', ''),
        data.get('work_detail', ''), data.get('scraped_at', '')
    ))

db.commit()
```

## 迁移结果

- 迁移了 84 条候选人记录
- 分布：6人推荐，52人待定，26人不推荐
- 旧 JSON 文件保留在 `candidates/` 目录作为备份

## 反向导出（SQLite → JSON）

如需从数据库导出为单人 JSON 文件：

```python
import sqlite3, json, os
db = sqlite3.connect('recruitment.db')
db.row_factory = sqlite3.Row
out_dir = 'candidates'
os.makedirs(out_dir, exist_ok=True)

for row in db.execute("SELECT * FROM candidates"):
    d = dict(row)
    fp = d.pop('id')
    with open(os.path.join(out_dir, f'{fp}.json'), 'w', encoding='utf-8') as f:
        json.dump(d, f, ensure_ascii=False, indent=2, default=str)
```