如何查询获取特定帖子id？

Question

我正在尝试用php和mysql (没有jquery或ajax)做一个评论系统，问题是如何找到用户评论的帖子的id，我使用了while循环，因为它张贴到所有的帖子，到目前为止我在这里.....

//user data is set
if (isset($_POST['comment'])) {
    //variables to post in database
    $comment = $_POST['comment'];
    $com_from = $_SESSION['user'];
    $com_to = $_GET['u'];
    $com_time = date("Y-m-d H:i:s");
    $u = $_GET['u'];

    //query to get the id of the post in the `post` table
    $que = mysql_query("SELECT * FROM posts WHERE `post_to` = '$u'");
    if ($que) {
        //loop through all the posts ad get all ID
        while ($ro = mysql_fetch_array($que)) {
            $pst_id = $ro['post_id'];
            //query inside the while loop for getting the post ID i think here is the problem
            if (!empty($_POST['comment'])) {
                $com_query = mysql_query("INSERT INTO comments SELECT '','$comment',`post_id`,'$com_from','$com_to','$com_time' FROM `posts` WHERE `posts`.`post_id` = $pst_id");
            }
        }
    }
}

Answer 1

首先，你不必通过循环来查询post表。如果你正在评论一个特定的帖子，用隐藏类型在html格式中传递它的ID。

// here 1 is id of post
<input type="hidden" name="postid" value="1">

然后您可以编写插入查询，如下所示：

if (isset($_POST['comment'])) {
    //variables to post in database
    $comment = $_POST['comment'];
    $com_from = $_SESSION['user'];
    // $com_to is post id and i believe comment table contain field to store post id
    $com_to = $_POST['postid'];
    $com_time = date("Y-m-d H:i:s");
$que = mysql_query("INSERT INTO comments VALUES('$comment','$com_to','$com_from','$com_time')");
}

Answer 2

我以有限的理解提供了insert查询，

 $pst_id = $_POST['postid']; // from form 

 $com_query = mysql_query("INSERT INTO comments  values ('$comment','$pst_id','$com_from','$com_to','$com_time') ");

如果您分享您的comments表结构，我可以为您提供更多帮助。

注释使用mysqli_*函数而不是mysql_*函数(deprecated)