我知道有很多类似的问题，但是从昨天开始搜索之后，我只想出了与单个表有关的问题。
现在我有两个表，即评论和 comment_replies ，一个用于评论，一个用于回复，其结构如下，并附有一些示例数据：
评论栏
comment_id | blog_id | comment_content | comment_time | comment_by
1 | 2 | parent comment | 13:33:17 | user1
2 | 2 | parent comment | 13:34:17 | user2
COMMENT_REPLIES FIELD
c_reply_id | parent_comment_id | blog_id | reply_content | reply_time | comment_by
1 | 1 | 2 | first reply | 13:35:17 | user3
2 | 1 | 2 | second reply | 13:36:17 | user1
我想获取所有回复的所有父评论。我目前使用的查询是这样做的，除非它只检索一个回复，即使父评论有多个。
当前查询
$getcomments = mysqli_query($db_connect, "SELECT * FROM comments WHERE blog_id = '$blog_id' ORDER BY comment_id ASC" );
$getcommentscount = mysqli_num_rows($getcomments);
if($getcommentscount != 0 ) {
while($comment = mysqli_fetch_assoc($getcomments)){
$comment_id = $comment['comment_id'];
$comment_content = $comment['comment_content'];
$comment_time = $comment['comment_time'];
$comment_by = $comment['comment_by'];
//Get picture of owner of comment
$get_user_info = mysqli_query($db_connect, "SELECT * FROM users WHERE username='$comment_by'");
$get_info = mysqli_fetch_assoc($get_user_info);
$commenter_image = $get_info['picture'];
$commenter_fname = $get_info['fname'];
$commenter_lname = $get_info['lname'];
if ($commenter_image == "") {
$commenter_image = "defaultp.jpg";
}
$comment_time_title = date('l, jS F, Y', strtotime($comment_time));
$comment_time_title = $comment_time_title." at ". date('g:ia', strtotime($comment_time));
$getreplies = mysqli_query($db_connect, "SELECT * FROM comment_replies WHERE parent_comment_id = '$comment_id' ORDER BY c_reply_id DESC" );
$getgetreplies_info = mysqli_num_rows($getreplies);
while ($reply = mysqli_fetch_array($getreplies)) {
$c_reply_id = $reply['c_reply_id'];
$parent_comment_id = $reply['parent_comment_id'];
$reply_content = $reply['reply_content'];
$reply_time = $reply['reply_time'];
$reply_by = $reply['reply_by'];
$reply_time_title = date('l, jS F, Y', strtotime($reply_time));
$reply_time_title = $reply_time_title." at ". date('g:ia', strtotime($reply_time));
//Get picture of owner of comment
$getreplyer = mysqli_query($db_connect, "SELECT * FROM users WHERE username ='$reply_by'");
$getreplyer_info = mysqli_fetch_assoc($getreplyer);
$replyer_image = $getreplyer_info['picture'];
$replyer_fname = $getreplyer_info['fname'];
$replyer_lname = $getreplyer_info['lname'];
if ($replyer_image == "") {
$replyer_image = "defaultp.jpg";
}
}
if($getgetreplies_info >= 1){
$displayReply = '
<div id="singleComment'.$c_reply_id.'" class="singleReplyComment clearfix">
<div class="sComment-Box clearfix">
<div class="cUser-image clearfix">
<img src="'.$base_url.'images/userdata/profileimage/'.$replyer_image.'">
</div>
<div class="cDetails clearfix">
<div class="cUser-name clearfix"><a href="'.$base_url.'user/'.$reply_by.'">'.$replyer_fname.' '.$replyer_lname.'</a></div>
<div class="commentContent">'.$reply_content.'</div>
</div>
<div class="cPosted-on clearfix"><time class="timeago" datetime="'.$reply_time.'" title="'.$reply_time_title.'">an hour ago</time></div>
</div>
</div>';
} else {
$displayReply = '';
}
echo '
<div id="singleComment'.$comment_id.'" class="singleComment clearfix">
<div class="sComment-Box clearfix">
<div class="cUser-image clearfix">
<img src="'.$base_url.'images/userdata/profileimage/'.$commenter_image.'">
</div>
<div class="cDetails clearfix">
<div class="cUser-name clearfix"><a href="'.$base_url.'user/'.$comment_by.'">'.$commenter_fname.' '.$commenter_lname.'</a></div>
<div id="cReply_id'.$comment_id.'" class="cReply clearfix">Reply</div>
<div class="commentContent">'.$comment_content.'</div>
</div>
<div class="cPosted-on clearfix"><time class="timeago" datetime="'.$comment_time.'" title="'.$comment_time_title.'">'.$comment_time.'</time></div>
<div id="replyCommentcReply_id'.$comment_id.'" class="replyComment clearfix">
<form id="replyComment-form'.$comment_id.'" class="replyComment-form">
<textarea class="commentText" name="userComment"></textarea>
<div class="error commenterror"></div>
<input type="submit" class="postComment-butt replyCom-butt" value="Post">
</form>
</div>
</div>
'.$displayReply.'
</div>
';
}
} else {
echo "<center><br><br><br>No comments to display!</center>";
}
以上查询有效，但就像我说它只检索父评论的一个回复，即使父评论有多个回复。
注意：请注意，回复无法回复，但父评论可以包含尽可能多的回复。
提前致谢！