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<?php
/*
Question2Answer by Gideon Greenspan and contributors
http://www.question2answer.org/
Description: Database-level access to cache table
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
More about this license: http://www.question2answer.org/license.php
*/
if (!defined('QA_VERSION')) { // don't allow this page to be requested directly from browser
header('Location: ../../');
exit;
}
require_once QA_INCLUDE_DIR . 'db/maxima.php';
/**
* Create (or replace) the item ($type, $cacheid) in the database cache table with $content
* @param $type
* @param $cacheid
* @param $content
* @return mixed
*/
function qa_db_cache_set($type, $cacheid, $content)
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
qa_db_query_sub(
'DELETE FROM ^cache WHERE lastread<NOW()-INTERVAL # SECOND',
QA_DB_MAX_CACHE_AGE
);
qa_db_query_sub(
'INSERT INTO ^cache (type, cacheid, content, created, lastread) VALUES ($, #, $, NOW(), NOW()) ' .
'ON DUPLICATE KEY UPDATE content = VALUES(content), created = VALUES(created), lastread = VALUES(lastread)',
$type, $cacheid, $content
);
}
/**
* Retrieve the item ($type, $cacheid) from the database cache table
* @param $type
* @param $cacheid
* @return mixed|null
*/
function qa_db_cache_get($type, $cacheid)
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
$content = qa_db_read_one_value(qa_db_query_sub(
'SELECT content FROM ^cache WHERE type=$ AND cacheid=#',
$type, $cacheid
), true);
if (isset($content))
qa_db_query_sub(
'UPDATE ^cache SET lastread=NOW() WHERE type=$ AND cacheid=#',
$type, $cacheid
);
return $content;
}