mysql_query给出资源ID＃17 [英] mysql_query gives Resource id #17

问题描述

有一个表需要写入结果，稍后会更新。要检查表是否已写入但我正在使用此代码：

展开 | 选择 | Wrap | 行号

解决方案

从手册

展开 | 选择 | Wrap | 行号

不是真的。它正在返回一个关于成功的Rescource，但正如我所提到的那样，它在sql中得到了空集（我想要的），所以肯定它应该返回false？

我错过了什么？

是的，空结果集不是错误。

要检查空结果集，请使用mysql_num_rows（）

Have a table that needs to have results written to it, that will later be updated. To check if the table has been written to yet I''m using this code:

Expand|Select|Wrap|Line Numbers

解决方案

From the manual

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Not really. It''s returning a Rescource on sucess but as I mentioned it was getting Empty Set (which I wanted) in the sql so surely it should be returning false?
Am I missing something?

Yes, an empty result set is not an error.
To check for an empty result set use mysql_num_rows()

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