# sql: 行已关闭

- **ID:** `go/database-sql-rows-closed`
- **领域:** go
- **类别:** runtime_error
- **验证级别:** ai_generated
- **修复率:** 80%

## 根因

在 sql.Rows 对象已关闭后（显式关闭或由于错误）尝试调用 Next() 或 Scan()。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| 1.15 | active | — | — |
| 1.20 | active | — | — |

## 解决方案

1. **** (95% 成功率)
   ```
   Always check errors and call rows.Close() in defer: defer rows.Close(); for rows.Next() { ... }
   ```
2. **** (90% 成功率)
   ```
   Check rows.Err() after iteration: if err := rows.Err(); err != nil { handleErr(err) }
   ```

## 无效尝试

- **** — Rows are already closed; further calls will panic or return stale data. (90% 失败率)
- **** — May cause data inconsistency and resource leaks if not handled properly. (60% 失败率)