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我正在尝试使用 PDO 创建博客，问题是当我转到应该列出我的文章的索引文件时，出现此错误。

C:\wamp\www\simpleblog\includes\config.php 中带有消息的未捕获异常 'PDOException'

PDOException: SQLSTATE[HY000] [2002] 由于目标机器主动拒绝，无法建立连接。在第 11 行的 C:\wamp\www\simpleblog\includes\config.php

我对 PDO 很陌生，所以我无法弄清楚可能导致问题的原因。我查看了其他问题，但找不到与此类似的任何问题。我检查了 phpmyadmin 并且数据库名称是正确的。
这是我的 index.php

<?php require('includes/config.php'); ?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>Blog</title>
    <link rel="stylesheet" href="style/normalize.css">
    <link rel="stylesheet" href="style/main.css">
</head>
<body>
    <div id="wrapper">

        <h1>Blog</h1>
        <hr />

        <?php
            try {

                $stmt = $db->query('SELECT postID, postTitle, postDesc, postDate FROM blog_posts ORDER BY postID DESC');
                while($row = $stmt->fetch()){

                    echo '<div>';
                        echo '<h1><a href="viewpost.php?id='.$row['postID'].'">'.$row['postTitle'].'</a></h1>';
                        echo '<p>Posted on '.date('jS M Y H:i:s', strtotime($row['postDate'])).'</p>';
                        echo '<p>'.$row['postDesc'].'</p>';             
                        echo '<p><a href="viewpost.php?id='.$row['postID'].'">Read More</a></p>';               
                    echo '</div>';

                }

            } catch(PDOException $e) {
                echo $e->getMessage();
            }
        ?>

    </div>


</body>
</html>

还有我的 config.php

<?php
ob_start();
session_start();

//database credentials
define('DBHOST','localhost');
define('DBUSER','root');
define('DBPASS','');
define('DBNAME','blog');

$db = new PDO("mysql:host=".DBHOST.";port=80;dbname=".DBNAME, DBUSER, DBPASS);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);


//set timezone
date_default_timezone_set('Europe/London');

//load classes as needed
function __autoload($class) {

   $class = strtolower($class);

    //if call from within assets adjust the path
   $classpath = 'classes/class.'.$class . '.php';
   if ( file_exists($classpath)) {
      require_once $classpath;
    }   

    //if call from within admin adjust the path
   $classpath = '../classes/class.'.$class . '.php';
   if ( file_exists($classpath)) {
      require_once $classpath;
    }

    //if call from within admin adjust the path
   $classpath = '../../classes/class.'.$class . '.php';
   if ( file_exists($classpath)) {
      require_once $classpath;
    }       

}

$user = new User($db); 
?>
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