php - 按总票数排序结果

Question

我正在构建一个投票系统。有两张表 - 一张用于 votes ，其他为items正在被投票表决。在此示例中，项目是线程。

首先，我得到元素。

其次，我获得项目的选票并进行计数。

第三，我想根据计票总数按顺序显示项目。

$q = $db_conn->prepare('SELECT id, title FROM thread');
$q->execute();
$q->bind_result($threadid, $title);
$q->store_result();
while($q->fetch()){

    $q2 = $db_conn->prepare('SELECT value FROM vote WHERE item_id = ? AND item_type_id = 1');
    $q2->bind_param('i', $threadid);
    $q2->execute();
    $q2->bind_result($value);
    $totvalue = 0;
    while($q2->fetch()){
        $totvalue += $value;
    }?>

    <span style='color:grey;'>[<?php echo $totvalue; ?>]</span>

    <form class='thread' method='POST'>
        <input type='image' name='vote' value='up' src='media/img/uparrow.png' />
        <input type='image' name='vote' value='down' src='media/img/downarrow.png' />
        <input type='hidden' name='threadid' value='<?php echo $threadid; ?>' />
    </form>

    <?php echo $title . "<br />";
    //DISPLAYS BY ID
}

我发现的唯一方法是将结果放入数组中并以这种方式排序。但是，当网站有数百个项目时，将整个表放入数组中是没有意义的。

$threads[] = array('threadid' => $threadid, 'title' => $title, 'totvalue' => $totvalue);

foreach ($threads as $key => $row) {
    $tid[$key]  = $row['threadid'];
    $title[$key] = $row['title'];
    $tval[$key] = $row['totvalue'];
} array_multisort($tval, SORT_DESC, $tid, SORT_DESC, $tval, SORT_DESC, $threads);

foreach ($threads as $t) { ?>

    <span style='color:grey;'>[<?php  echo $t['totvalue']; ?>]</span>

    <form class='thread' method='POST'>
        <input type='image' name='vote' value='up' src='media/img/uparrow.png' />
        <input type='image' name='vote' value='down' src='media/img/downarrow.png' />
        <input type='hidden' name='threadid' value='<?php echo $t['threadid']; ?>' />
    </form>

    <?php echo $t['title'] . "<br />";
    //DISPLAYS BY TOTAL VOTES YET THE SOLUTION IS HORRID
}

有没有办法用MySQL来做到这一点？或者还有其他最佳解决方案吗？

Answer 1

首先，您应该将查询合并为一个查询并保存查询，您应该阅读 mysql 文档/教程，因为它可以为您节省大量后端工作。

SELECT thread.id, thread.title, count(vote.value) as votes 
FROM thread JOIN vote ON thread.id = vote.item_id 
WHERE vote.item_type_id = 1
GROUP BY thread.id
ORDER BY votes DESC`