php将BLOB保存到数据库权限错误

Question

我试图将一些变量，图像和pdf文件保存到我的mysql数据库中。 （对图像和pdf文件使用longblob）。这样做我得到以下错误：

Warning: mysql_connect(): Access denied for user 

＆安培;

 Warning: mysql_query() expects parameter 2 to be resource, boolean given

我已查看过拨款表

GRANT USAGE ON *.* user....
 GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, INDEX, ALTER, LOCK TABLES 

说实话，我甚至不确定代码是否有效，但我想首先至少消除错误。有谁知道我可以解决这个问题以及我哪里出错了？任何代码示例都非常感谢。

require_once __DIR__.'/config.php';

/*** connect to db ***/
        $dbh = new PDO('mysql:host=' . DB_HOST . ';dbname=' . DB_USERNAME, DB_USERNAME, DB_PASSWORD);
        $conn = mysql_connect(DB_HOST, DB_USERNAME, DB_DATABASE, DB_PASSWORD);

if(isset($_POST['submit'])) {
            $title = $_POST["title"];
            $authors = $_POST["authors"];
            $description = $_POST["description"];
            $price = $_POST["price"];
            $file = $_FILES ['image']['tmp_name'];
            $file2 = $_FILES ['content']['tmp_name'];

            $image = addslashes(file_get_contents($_FILES['image']['tmp_name']));

            $content = addslashes(file_get_contents($_FILES['content']['tmp_name']));

            $sql = "INSERT INTO books2 VALUES ('$title', '$authors', '$description', '$price', 
         '$image','$content') ";
          $r = mysql_query($sql, $conn);
          if($r)
          {
         echo "<p>Thank you for entering this book!</p>";
            }


}