无法通过 PDO MySQL 插入数据

如何解决无法通过 PDO MySQL 插入数据

我是 PDO 和 PHP 的新手。有人能告诉我我的代码有什么问题吗？浏览器没有错误，只显示（连接失败）。

<?PHP

class Connect
{
    private $host = "localhost";
    private $user = "root";
    private $password = "";
    private $database = "srs_electrical";
    private $dsn;
    public $con;
    public $stmt;

    function __construct()
    {
        try
        {
            $this->dsn = 'MysqL:host = ' . $this->host . ';dbname = ' . $this->database;
            $this->con = new PDO($this->dsn,$this->user,$this->password);
            $this->con->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
            $this->stmt = $this->con->prepare("INSERT INTO comp_users VALUES(NULL,'Name','Email','Password')");
            $this->stmt->execute();
            echo 'connected';
        }
        catch(PDOException $e)
        {
            die("Connection Failed");
            $e->getMessage();
        }
    }
}
$con = new Connect();
?>