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报个Bug，事务处理时有外键时报出来的。

### 问题描述

### Swoole版本 V4.4.13，PHP版本 7.2.31，以及操作系统版本信息

### 相关代码
```php
PHP Recoverable fatal error:  Object of class Hyperf\Database\MySqlConnection could not be converted to string in /usr/local/cms/vendor/hyperf/database/src/MySqlConnection.php on line 44

Recoverable fatal error: Object of class Hyperf\Database\MySqlConnection could not be converted to string in /usr/local/cms/vendor/hyperf/database/src/MySqlConnection.php on line 44
[2020-07-07 15:06:14 $194192.0] WARNING swManager_check_exit_status: worker#2[pid=194201] abnormal exit, status=0, signal=11
A bug occurred in Swoole-v4.4.13RC2, please report it.
The Swoole developers probably don't know about it,
and unless you report it, chances are it won't be fixed.
You can read How to report a bug doc before submitting any bug reports:
>> https://github.com/swoole/swoole-src/blob/master/.github/ISSUE.md 
Please do not send bug reports in the mailing list or personal letters.
The issue page is also suitable to submit feature requests.
```

### 你期待的结果是什么？实际看到的错误信息又是什么？

发布于6年前 · 11 次浏览 · 来自建议