[英]Doctrine Result caching with Memcached
I've just installed Memcached and i'm trying to use it to cache results of various queries done with Doctrine ORM (Doctrine 2.4.8+, Symfony 2.8+).我刚刚安装了 Memcached,我正在尝试使用它来缓存使用 Doctrine ORM(Doctrine 2.4.8+,Symfony 2.8+)完成的各种查询的结果。
My app/config/config_prod.yml
have this :我的
app/config/config_prod.yml
有这个:
doctrine:
orm:
metadata_cache_driver: memcached
result_cache_driver: memcached
query_cache_driver: memcached
And i tried to useResultCache()
on 2 queries like that (i just replaced the cache id here for the example) : return $query->useResultCache(true, 300, "my_cache_id")->getArrayResult();
我尝试在 2 个这样的查询上使用结果
useResultCache()
(我只是在示例中替换了缓存 ID): return $query->useResultCache(true, 300, "my_cache_id")->getArrayResult();
. . Special queries here because they're native queries (SQL) due to their complexity, but the method is available for any query ( class AbstractQuery ) so i assume it should work.
这里的特殊查询是因为它们是本机查询 (SQL),因为它们很复杂,但该方法可用于任何查询( AbstractQuery 类),所以我认为它应该可以工作。
Unfortunately, it doesn't.不幸的是,事实并非如此。 Everytime i refresh the page, if i just did a change in the database, the change is displayed.
每次刷新页面时,如果我只是在数据库中进行了更改,则会显示更改。 I've checked the stats of memcached and it seems there're still some cache hits but i don't really know how, cf.
我检查了 memcached 的统计数据,似乎仍然有一些缓存命中,但我真的不知道如何,参见。 what i just said.
我刚才说的。
Does anyone has an idea on why the cache doesn't seem to be used here to get the supposedly cached results ?有没有人知道为什么这里似乎没有使用缓存来获取所谓的缓存结果? Did i misunderstand something and the TTL is ignored somehow ?
我是否误解了某些东西并且以某种方式忽略了 TTL?
There's no error generated, memcached log is empty.没有产生错误,memcached 日志是空的。
As requested by @nifr, here is the layout of my code to create the 2 native queries i put a Memcached test on :根据@nifr 的要求,这里是我的代码布局,用于创建我对 Memcached 测试进行的 2 个本机查询:
$rsm = new ResultSetMapping;
$rsm->addEntityResult('my_entity_user', 'u');
// some $rsm->addFieldResult('u', 'column', 'field');
// some $rsm->addScalarResult('column', 'alias');
$sqlQuery = 'SELECT
...
FROM ...
INNER JOIN ... ON ...
INNER JOIN ... ON ...
// some more join
WHERE condition1
AND condition2';
// some conditions added depending on params passed to this function
$sqlQuery .= '
AND (fieldX = (subrequest1))
AND (fieldY = (subrequest2))
AND condition3
AND condition4
GROUP BY ...
ORDER BY ...
LIMIT :nbPerPage
OFFSET :offset
';
$query =
$this->_em->createNativeQuery($sqlQuery, $rsm)
// some ->setParameter('param', value)
;
return $query->useResultCache(true, 300, "my_cache_id")->getArrayResult();
So, it seems for some reason Doctrine doesn't succeed to get the ResultCacheDriver.因此,似乎出于某种原因,Doctrine 无法成功获取 ResultCacheDriver。 I tried to set it before the
useResultCache()
but i had an exception from Memcached : Error: Call to a member function get() on null
.我试图在
useResultCache()
之前设置它,但我有一个来自 Memcached 的异常: Error: Call to a member function get() on null
。
I've decided to do it more directly by calling Memcached().我决定通过调用 Memcached() 来更直接地做到这一点。 I guess i'll do this kind of stuff in controllers and repositories, depending on my needs.
我想我会根据我的需要在控制器和存储库中做这种事情。 After some tests it works perfectly.
经过一些测试,它完美地工作。
Here is what i basically do :这是我的主要工作:
$cacheHit = false;
$cacheId = md5("my_cache_id"); // Generate an hash for your cache id
// We check if Memcached exists, if it's not installed in dev environment for instance
if (class_exists('Memcached'))
{
$cache = new \Memcached();
$cache->addServer('localhost', 11211);
$cacheContent = $cache->get($cacheId);
// We check if the content is already cached
if ($cacheContent != false)
{
// Content cached, that's a cache hit
$content = $cacheContent;
$cacheHit = true;
}
}
// No cache hit ? We do our stuff and set the cache content for future requests
if ($cacheHit == false)
{
// Do the stuff you want to cache here and put it in a variable, $content for instance
if (class_exists('Memcached') and $cacheHit == false) $cache->set($cacheId, $content, time() + 600); // Here cache will expire in 600 seconds
}
I'll probably put this in a Service.我可能会把它放在一个服务中。 Not sure yet what's the "best practice" for this kind of stuff.
尚不确定这种东西的“最佳实践”是什么。
Edit : I did a service.编辑:我做了一个服务。 But it only works with native sql... So the problem stays unsolved.
但它只适用于本机 sql ......所以问题仍未解决。
Edit² : I've found a working solution about this null issue (meaning it couldn't find Memcached).编辑²:我找到了有关此空问题的有效解决方案(意味着它找不到 Memcached)。 The bit of code :
代码位:
$memcached = new \Memcached();
$memcached->addServer('localhost', 11211);
$doctrineMemcached = new \Doctrine\Common\Cache\MemcachedCache();
$doctrineMemcached->setMemcached($memcached);
$query
->setResultCacheDriver($doctrineMemcached)
->useResultCache(true, 300);
Now, i would like to know which stuff should i put in the config_prod.yml
to just use the useResultCache()
function.现在,我想知道我应该在
config_prod.yml
放入哪些内容以仅使用useResultCache()
函数。
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