检查Memcache中是否存在密钥 [英] Check if a key exists in Memcache

问题描述

如何在PHP中检查是否将值存储在Memcache中而不进行获取?我不喜欢获取它，因为我设置的值都为1MB，获取之后我就没有用了，所以浪费了资源.我在脚本中使用此脚本，该脚本检查某些密钥是否已缓存在内存缓存中，如果没有，它将从慢速数据源读取它们并将其设置在内存缓存中.

How do I check in PHP if a value is stored in Memcache without fetching it? I don't like fetching it because the values I have set are all 1MB in size and after I fetch it, I have no use for it, so I'm wasting resources. I'm using this in a script that checks if certain keys are cached in memcache and if not, it reads them from a slow data source and sets them in memcache.

如果我使用Memcached::append将NULL附加到要检查的密钥上怎么办?如果成功，则返回TRUE；如果失败，则返回FALSE.如果键不存在，Memcached::getResultCode将返回Memcached::RES_NOTSTORED.这样，我检查密钥是否存在，并且应该将密钥放在LRU列表的顶部吗?

What if I use Memcached::append to append NULL to the key I'm checking? Returns TRUE on success or FALSE on failure. The Memcached::getResultCode will return Memcached::RES_NOTSTORED if the key does not exist. This way I check whether the key exists and it should put the key on top of the LRU list right?

谢谢.

推荐答案

我想知道为什么Memcached没有特殊的方法.经过一些考虑之后，我得出以下结论:

I wonder why Memcached has no special method for it. Here is what I came down to after some considerations:

function has($key)
{
    $m->get($key)

    return \Memcached::RES_NOTFOUND !== $m->getResultCode();
}

这篇关于检查Memcache中是否存在密钥的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！