Файл: qa-include/qa-db-hotness.php
Строк: 106
<?php
/*
Question2Answer (c) Gideon Greenspan
http://www.question2answer.org/
File: qa-include/qa-db-hotness.php
Version: See define()s at top of qa-include/qa-base.php
Description: Functions for dealing with question hotness in the database
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;
}
function qa_db_hotness_update($firstpostid, $lastpostid=null, $viewincrement=false)
/*
Recalculate the hotness in the database for posts $firstpostid to $lastpostid (if specified)
If $viewincrement is true, also increment the views counter for the post, and include that in the hotness calculation
*/
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
if (qa_should_update_counts()) {
if (!isset($lastpostid))
$lastpostid=$firstpostid;
$query= "UPDATE ^posts AS x, (SELECT parents.postid, parents.created AS qcreated, COALESCE(MAX(children.created), parents.created) as acreated, COUNT(children.postid) AS acount, parents.netvotes, parents.views FROM ^posts AS parents LEFT JOIN ^posts AS children ON parents.postid=children.parentid AND children.type='A' WHERE parents.postid>=# AND parents.postid<=# AND LEFT(parents.type, 1)='Q' GROUP BY postid) AS a SET x.hotness=(".
'((TO_DAYS(a.qcreated)-734138)*86400.0+TIME_TO_SEC(a.qcreated))*# + '. // zero-point is Jan 1, 2010
'((TO_DAYS(a.acreated)-734138)*86400.0+TIME_TO_SEC(a.acreated))*# + '.
'(a.acount+0.0)*# + '.
'(a.netvotes+0.0)*# + '.
'(a.views+0.0+#)*#'.
')'.($viewincrement ? ', x.views=x.views+1, x.lastviewip=INET_ATON($)' : '').' WHERE x.postid=a.postid';
// Additional multiples based on empirical analysis of activity on Q2A meta site to give approx equal influence for all factors
$arguments=array(
$firstpostid,
$lastpostid,
qa_opt('hot_weight_q_age'),
qa_opt('hot_weight_a_age'),
qa_opt('hot_weight_answers')*160000,
qa_opt('hot_weight_votes')*160000,
$viewincrement ? 1 : 0,
qa_opt('hot_weight_views')*4000,
);
if ($viewincrement)
$arguments[]=qa_remote_ip_address();
qa_db_query_raw(qa_db_apply_sub($query, $arguments));
}
}
/*
Omit PHP closing tag to help avoid accidental output
*/