Система комментирования с помощью ajax php mysql

Question

Не понимаю почему комментарии не добавляются в БД, при заполнении формы выводиться только надпись "Comment posted Successfully.". Помогите пожалуйста, уже руки опускаются 1)db.connect.php

    $host = 'localhost';
$user = 'root';
$password = 'root';
$dbname = 'phpzag';

$dsn = "mysql:host=$host;dbname=$dbname;charset=utf8";
$pdo = new PDO($dsn,$user,$password);
$pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES,false);

2)Таблица mysql

    CREATE TABLE `comment` (
  `id` int NOT NULL  AUTO_INCREMENT,
  `parent_id` int NOT NULL,
  `comment` varchar(200) NOT NULL,
  `sender` varchar(40) NOT NULL,
  `date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

3)index.php

    <!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Главная страница</title>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
    <script src="comments.js"></script>
</head>
<body>
<div class="container">
    <h2>Example: Comment System with Ajax, PHP & MySQL</h2>
    <form method="POST" id="commentForm">
        <div class="form-group">
            <input type="text" name="name" id="name" class="form-control" placeholder="Enter Name" required />
        </div>
        <div class="form-group">
            <textarea name="comment" id="comment" class="form-control" placeholder="Enter Comment" rows="5" required></textarea>
        </div>
        <span id="message"></span>
        <div class="form-group">
            <input type="hidden" name="commentId" id="commentId" value="0" />
            <input type="submit" name="submit" id="submit" class="btn btn-primary" value="Post Comment"/>
        </div>
    </form>
    <div id="showComments"></div>
</div>
</body>
</html>

4)comments.js

    $(document).ready(function () {
    $('#commentForm').on('submit',function (event) {
        event.preventDefault();
        var formData = $(this).serialize();
        $.ajax({
            url: "comments.php",
            method: "POST",
            data: formData,
            dataType: "JSON",
            success : function (response){
                if (!response.error){
                    $('#commentForm')[0].reset();
                    $('#commentId').val('0');
                    $('#message').html(response.message);
                    showComments();
                }
                else if (response.error){
                    $('#message').html(response.message);
                }
            }
        })
    });
});
function showComments(){
    $.ajax({
        url: 'showComments.php',
        method: 'POST',
        success: function (response){
            $('#showComments').html(response);
        }
    })
}

5)comments.php

    include_once 'db_connect.php';

if (!empty($_POST['name']) && !empty($_POST['comment'])) {
    $commentId = $_POST['commentId'];
    $name = $_POST['name'];
    $comment = $_POST['comment'];
    $sqlInsert = "INSERT INTO `comment`(`parent_id`, `comment`, `sender`) VALUES (':commentId',':comment',':name');";
    $stmtInsert = $pdo->prepare($sqlInsert);
    $stmtInsert->execute([':commentId' => $commentId, ':comment' => $comment, ':name' => $name]);
    $message = '<label class="text-success">Comment posted Successfully.</label>';
    $status = ['error' => 0, 'message' => $message];
}
    else{
        $message = '<label class="text-danger">Error: Comment not posted.</label>';
        $status = ['error'=>1,'message'=>$message];
    }
    echo json_encode($status);

6)showComments.php

    <?php
include_once 'db_connect.php';

$sqlSelect = "SELECT * FROM `comment` WHERE parent_id = ':parent_id' ORDER BY id DESC;";
$stmtSelect = $pdo->prepare($sqlSelect);
$stmtSelect->execute(['parent_id'=>0]);
$comments = $stmtSelect->fetchAll(PDO::FETCH_ASSOC);
$commentHTML = '';
foreach ($comments as $comment){
    $commentHTML.= '<div class="panel panel-primary">
        <div class="panel-heading">By <b>'.$comment["sender"].'</b> on <i>'.$comment["date"].'</i></div>
        <div class="panel-body">'.$comment["comment"].'</div>
        <div class="panel-footer" align="right"><button type="button" class="btn btn-primary reply" id="'.$comment["id"].'">Reply</button></div>
        </div>';
    $commentHTML .= getCommentReply($pdo,$comment['id']);
}
echo $commentHTML;

function getCommentReply($pdo,$parentId = 0, $marginLeft = 0){
    $commentHTML = '';
    $sqlCount = "SELECT COUNT(id) FROM comment;";
    $stmtCount = $pdo->query($sqlCount);
    $commentsCount = $stmtCount->fetchColumn();
    if ($parentId==0){
        $marginLeft = 0;
    }
    else{
        $marginLeft+=48;
    }
    if ($commentsCount>0){
        $sqlFetch = "SELECT * FROM comment WHERE parent_id = ':parentId';";
        $stmtFetch = $pdo->prepare($sqlFetch);
        $stmtFetch->execute([':parentId'=>$parentId]);
        $comments = $stmtFetch->fetchAll(PDO::FETCH_ASSOC);

        foreach ($comments as $comment){
            $commentHTML .= '
                <div class="panel panel-primary" style="margin-left:'.$marginLeft.'px">
                <div class="panel-heading">By <b>'.$comment["sender"].'</b> on <i>'.$comment["date"].'</i></div>
                <div class="panel-body">'.$comment["comment"].'</div>
                <div class="panel-footer" align="right"><button type="button" class="btn btn-primary reply" id="'.$comment["id"].'">Reply</button></div>
                </div>
                ';
            $commentHTML .= getCommentReply($pdo,$comment['id'],$marginLeft);
        }

    }
    return $commentHTML;

}

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Система комментирования с помощью ajax php mysql

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