如果表

Question

我有一个页面，可以在数据库中动态查找注释和回复，并相应地生成代码。现在，我想计算每条评论的回复数量（下表中的comment_id），如果它们超过3，则显示"There are XX replies"，否则会显示所有回复。

回复表看起来像这样

+---------------------+----+---------+------------------+------------+
| date                | id | user_id | reply            | comment_id |
+---------------------+----+---------+------------------+------------+
| xxxx-xx-xx xx:xx:xx |  1 |      01 | adasdasdasdasdas |          8 |
| xxxx-xx-xx xx:xx:xx |  2 |      02 | test             |          8 |
| xxxx-xx-xx xx:xx:xx |  3 |      03 | m  no            |          8 |
| xxxx-xx-xx xx:xx:xx |  4 |      03 | mno              |          8 |
| xxxx-xx-xx xx:xx:xx |  5 |      05 | hehe             |         10 |
+---------------------+----+---------+------------------+------------+

id是回复的ID

user_id是撰写评论的用户

comment_id是父亲的回复（a.k.a.评论）

到目前为止，我所尝试的是：

$querys = "SELECT * FROM replies 
            WHERE comment_id = {$writeComment['comment_id']} 
            ORDER BY date DESC;";

$findReplies = mysqli_query($_SESSION['connection'], $querys);

while ($reply = mysqli_fetch_assoc($findReplies)) {
    $countReplies = "SELECT * FROM replies
                    GROUP BY comment_id
                    HAVING COUNT( DISTINCT comment_id ) > 3;";

$moreThanThree = mysqli_query($_SESSION['connection'], $countReplies);

if(!$moreThanThree){
    // code for lass than 3 replies
} else {
    // there are xx replies
    // show  all replies
}

Answer 1

您可以按查询分组查找回复计数。然后使用这些结果，您可以相应地显示文本。

SELECT comment_id, count(*) FROM replies GROUP BY comment_id

Answer 2

您可以使用此查询：

  

选择回复，（从回复replies_inner中选择count（*），其中replies_inner.comment_id = replies.comment_id）作为回复中的reply_count

然后你可以循环访问php：

box-sizing: border-box

Answer 3

所以我设法解决了这个问题，部分感谢@Gouda Elalfy：

while ($reply = mysqli_fetch_assoc($findReplies)) {

    $querya = "SELECT comment_id, (SELECT COUNT(*) FROM replies 
           WHERE comment_id = {$writeComment['comment_id']}) 
           AS reply_count FROM replies";


    $findHowMany = mysqli_query($_SESSION['connection'], $querya);
    $moreThanThree = mysqli_fetch_assoc($findHowMany);


        if($moreThanThree['reply_count'] < 3){
            //print comment
        } elseif (isset($prevId)){
           if(prevID != $reply['id']){
           // print "there are xx comments"
           break;
           }
        }

    $prevId = $reply['id'];
}