fix: 修复文档状态在多次取消的情况下状态错误

[shaohuzhang1]

fix: 修复文档状态在多次取消的情况下状态错误

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[shaohuzhang1]

该段代码存在一些问题和可以改进的地方。

首先，在update_status()方法中，如果只更新了记录的状态，那么可能会丢失其他字段的信息。为了解决这个问题，需要确保在查询结果后执行额外的操作以获取所有列的数据。

此外，由于使用了字符串运算(__str__())以及字典索引进行赋值操作，可能存在性能不佳的情况。因此，应当使用Python内置的方式替换这些方式以便于提高程序的运行效率。

最后，应该避免直接对数据库中的数据进行修改（例如通过改变其状态或取消当前的任务），而应利用事务来进行控制以保证安全性。这样能够有效地解决并发访问时可能出现的问题，并且提高了整体的健壮性和稳定性。