Mysql Database with PDO

Inserting & Fetching Database

try
{
	$conn = new PDO ( "mysql:host=localhost; dbname=pdo" , "root", "");
	$conn -> setAttribute (PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
	//-- echo "Connected Successfully";
}
catch (PDOException $e)
{
	echo "Connection Failed...". $e -> getMessage();
}


if (isset($_POST['submit']))
{

$name = $_POST['name'];
$class = $_POST['class'];
$address = $_POST['address'];
$city = $_POST['city'];

if(!empty($name) || !empty($class) || !empty($address) || !empty($city))
{
	$query = $conn -> prepare ("insert into studentlist (name, class, address, city) values ('$name', '$class', '$address', '$city')");
	if (!$query -> execute())
	{
		echo "Fail";
	}
	else
	{
		echo "Passed";
	}
}
else{echo "All Fields are Mendatory...";}
}// ------- if isset

Connection Failed...SQLSTATE[HY000] [1045] Access denied for user 'root'@'localhost' (using password: NO)

Name
Class
Address
City
Submit

---

Fetching Database

try
	{
		$query = $conn -> prepare("select * from studentlist");
		$query->execute();
		$students = $query -> fetchAll();

		$i = 1;
		foreach ($students as $key)
		{
			
			echo"".$i++."".$key['name']."".$key['class']."".$key['address']."".$key['city']."";
		}
	}
	catch (PDOException $e)
	{
		echo "Error ... ". $e->getMessage();
	}
$conn = null;	

S. No.	Name	Class	Address	City