# sqlalchemy.exc.InvalidRequestError：此会话处于'已关闭'状态。不允许任何操作。

- **ID:** `python/sqlalchemy-commit-rollback-session-closed`
- **领域:** python
- **类别:** runtime_error
- **验证级别:** ai_generated
- **修复率:** 80%

## 根因

尝试在会话关闭后使用它。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| 3.x | active | — | — |

## 解决方案

1. **Create a new session instance.** (95% 成功率)
   ```
   from sqlalchemy.orm import Session
new_session = Session(engine)
   ```
2. **Use context manager to auto-close.** (90% 成功率)
   ```
   with Session(engine) as session:
    session.add(obj)
    session.commit()
   ```

## 无效尝试

- **Calling session.open() which does not exist.** — Session has no open method; must create new session. (90% 失败率)
- **Reassigning session variable to same closed object.** — Object still closed; operations fail. (80% 失败率)