作者：mobiledu2502926273 | 来源：互联网 | 2017-05-13 02:31
Modoer列表页性能分析及优化。在www.modoer.orgbeijingitemlist-8的页面中，会执行以下2个sqlSELECTs.sid,pid,catid,domain,name,avgsort,sort1,sort2,sort3,sort4,sort5,sort6,sort7,sort8,best,
在 http://www.modoer.org/beijing/item/list-8 的页面中，会执行以下2个sqlSELECT s.sid,pid,catid,domain,name,avgsort,sort1,sort2,sort3,sort4,sort5,sort6,sort7,sort8,best,finer,pageviews,reviews,pictures,favorites,thumb,aid,map_lat,map_lng,c_tel,c_dz FROM modoer_subject s LEFT JOIN modoer_subject_shishang sf ON (s.sid = sf.sid) WHERE exists(SELECT 1 FROM modoer_subjectatt st WHERE s.sid=st.sid AND attid=173) AND exists(SELECT 1 FROM modoer_subjectatt st WHERE s.sid=st.sid AND attid=4) ORDER BY finer DESC LIMIT 0, 20 SELECT COUNT(*) FROM modoer_subject s WHERE exists(SELECT 1 FROM modoer_subjectatt st WHERE s.sid=st.sid AND attid=173) AND exists(SELECT 1 FROM modoer_subjectatt st WHERE s.sid=st.sid AND attid=4)如果数据量不大的话，还凑活，如果数据量大的话呢？以本人的数据为例，分别是subjectatt数据量和subject数据量
sql运行结果如图：
仅仅一个查询数据量的sql花了44.16秒，网站根本打不开，难道技术没有测试没有优化吗？复合语句用起来很爽但是效果很差经本人暂时优化，subject_class.php中改掉以下代码，性能大大提升if($atts) { $attlist = array_values($atts); $num = count($attlist); if($num>0){ $or = ''; $sql ='select GROUP_CONCAT(sid) sids from( select count(sid) count,sid from ( select sid,attid from modoer_subjectatt where '; foreach($attlist as $attid) { //$this->db->where_exist("SELECT 1 FROM dbpre_subjectatt st WHERE s.sid=st.sid AND attid=$attid"); if($attid<1)continue; $sql .= $or . ' attid='.$attid; $or = ' or '; } $sql .= ') as temp group by sid) as temp1 where count='.$num; } $query=$this->db->query($sql);$b=$query->fetch_array();$sids=$b['sids']; //$where = ' s.sid in('.$sids.') ';
$this->db->where('s.sid', explode(',', $sids), '');
}else{
$where = '';
}
还有查询数量的地方
if($atts) {
$attlist = array_values($atts);
$num = count($attlist);
if($num>0){
$or = '';
$sql ='select count(*) as nums from(
select count(sid) count from (
select sid,attid from modoer_subjectatt where ';
foreach($attlist as $attid) {
//$this->db->where_exist("SELECT 1 FROM dbpre_subjectatt st WHERE s.sid=st.sid AND attid=$attid");
if($attid<1)continue;
$sql .= $or . ' attid='.$attid;
$or = ' or ';
}
$sql .= ') as temp
group by sid) as temp1
where count='.$num;
}
}
希望有用到的朋友可以改下，也只是暂时解决办法。另有问题请联系qq 272164179
http://www.bkjia.com/PHPjc/626609.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/626609.htmlTechArticle在 http://www.modoer.org/beijing/item/list-8 的页面中，会执行以下2个sql SELECT s.sid,pid,catid,domain,name,avgsort,sort1,sort2,sort3,sort4,sort5,sort6,sort7,sort8,best,...
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