为什么给表加了读锁之后无法把数据查询出来？-PHP Tutorial-php.cn

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为什么给表加了读锁之后无法把数据查询出来？

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Jun 23, 2016 pm 02:25 PM

mysql_query("LOCK TABLES tablename READ;");$result=mysql_query($sql, $conn);mysql_query("UNLOCK TABLES;");

注释掉第一条语句之后能够正常地把记录查询出来，但是一旦使用第一条语句就什么都查不出来了。

回复讨论(解决方案)

你都不让读了，如何能读出来？

你都不让读了，如何能读出来？
但是我加了写锁之后是可以写入的。加读锁不是只有本线程（可能不是这个词）和其他线程都可以读，谁都不可以写么？

请您认真阅读手册后，我们再讨论

请您认真阅读手册后，我们再讨论
我看不了大段的英文。

不是有中文手册吗

不是有中文手册吗
你说完我下载了一个中文的。
中文的我也没看出来什么，我看的是LOCK TABLES那个部分。我试了一下那个别名，还是不行。

不是有中文手册吗
我在MySQL的命令行界面下试了一下读锁，和网上的那个一样，跟我想的也一样，但是用PHP就不行。

我了个草，我自己找到毛病了。我那个SELECT使用了两个表，但我只锁了一个表，如果只锁一个的话，此线程或者说会话只能读这一个表，其他的表都会拒绝读。这样SELECT自然查不出结果了。
真服了我自己了，我本来写了一个单独的简单的php程序来测试错误来着，这个简单的php程序居然也一直在错。可能是复制粘贴之后没有改参数之类的东西的原因吧。
等帖子沉了再结贴吧，希望别人不要像我这么粗心。

楼主为什么我用这条语句却锁定不了表

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