На страницах этого блога уже было описано применение технологии memcache для кеширования веб страниц целиком. действительно, это очень удобная технология позволяет делать это очень быстро и надежно, при этом нет необходимости держать огромную папку закешированного содержимого. Все лежит в оперативной памяти.

Конечно, если памяти доступной для этого расширения не достаточно, то тут ничего не сделаешь. Но для выделенных сервером, как было в моем случае, это не проблема.

В этой статье я расскажу, как закешировать sql запросы к базе данных. 

В любой нормальной системе, будь то CMS или фреймворк, есть срипт, который отвечает за запросы к базе данных. Мало кто из программистов в наше время пишет 

mysql_query('select * from tablename')

всегда есть некая прослойка. Если ее нет, то ее не сложно написать. В этой статье я буду ускорять CMS Joomla и при этом буду использовать свою   прослойку uno, которая в свою очередь является прослойкой над Joomla прослойкой над PDO интерфейсом. Вот такие хитросплетения. 

В uno есть несколько методов для выборки данных: getRows,getRows,count, getRowsBySQL,exists,getRowsBySQL

Вот их и нужно кешировать. Для этого в каждый метод, необходимо добавить параметр: $usecache = false. Далее, напишу, как это работает на примере только getRow. Предполагается, что у вас уже есть класс для работы с memcahe

static public function getRow($table,$conditions=false,$colums=array('*'),$order = false,$offset = 0, $usecache = false){
	$key = md5(serialize(array($table,$conditions,$colums,$order,$offset)));
	if( $usecache and $result = mem::gi()->get($key))
		return $result;
	$result = self::query($table,$conditions,$colums,$order,1,$offset)->loadAssoc();
	if( $usecache!==false ){
	return $result;

 При использовании метода, в параметр   $usecache, нужно подать количество секунд для хранения данных в memcache, по истечении которых, кеш нужно будет обновить. 

В статичных сайтах, этим значением может быть очень больше число. Если сайт создан исключительно для продажи контекстной рекламы Google (Гугл), и представляет собой множество интересных постов, то там можно кешировать и при помощи файлов.   

Но для динамичных порталов, в которых такое кеширование и имеет смысл делать, нужно предусмотреть обновление кеша. 

К примеру, пользователь зарегистрировался. После этого, список ранее закешированных пользователей нужно обновить. Для этого в $usememcache нужно подать 0. Тогда кеш затрется. 

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+1 # Sfera1 03.03.2015 00:07
Чудно написано, но только вообще ничего не понятно.
По этому и не нужно.
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venture capitalist
0 # venture capitalist 03.09.2021 00:26
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venture capital
0 # venture capital 03.09.2021 18:58
Peters himself has stated that Schawbel "has taken individual branding to a dimension a million miles beyond exactly where I was." Schawbel
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You almost certainly currently have a good instinctive feel for
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venture capitalist
0 # venture capitalist 04.09.2021 16:43
VentureOnee Corporation. "1998 Investment Highlights." Industry Data.
This investigation updates earlier study by the Diana Project using a
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capital venture
0 # capital venture 04.09.2021 22:54
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Cap table, monetary liability (loans or encumbrances), so that they could
understand the terms in which othher people invested and what outstanding liabilities the organization may possibly be subject to that could effect cash flow and revenue redemptions.

Total Investment is the total quantity off capital the VC fund has
invested. The bigger the fund, the bigger the conmon amount
off investment per company,with rights for stick to on investment.
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capital venture
0 # capital venture 05.09.2021 05:56
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Judi Online
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