# sql: 事务已提交或回滚

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

## 根因

对已最终确定的事务调用 Commit() 或 Rollback()，导致错误。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| 1.14 | active | — | — |
| 1.18 | active | — | — |

## 解决方案

1. **** (90% 成功率)
   ```
   Use defer with a check: defer func() { if err := tx.Rollback(); err != sql.ErrTxDone { log.Fatal(err) } }()
   ```
2. **** (85% 成功率)
   ```
   Track transaction state with a boolean: committed := false; if err := tx.Commit(); err == nil { committed = true }
   ```

## 无效尝试

- **** — Transaction state is already final; continuing may lead to data inconsistency. (70% 失败率)
- **** — Rollback will also fail because the transaction is already done. (90% 失败率)