MySQL查询不分配/返回变量？

Question

Here's my Function/Class

class user
{
    public function get_data($username)
    {
        global $pdo;
        $query = $pdo->prepare("SELECT * WHERE user_name = ?"); //display oldest to newest
        $query->bindValue(1, $username);
        $query->execute();
        return $query->fetch();
    }
}

Here's how I do my Call.

$users = new user;
$user = $users->get_data($_POST['username']);
$_SESSION['username'] = $user['user_name'];
$_SESSION['id'] = $user['user_id'];
$_SESSION['credits'] = $user['user_credits'];

Here's my HTML

<li class="right"><a href="#">Hello, <?php echo $_SESSION['username']; ?>.</a></li>
<li class="right"><?php echo $_SESSION['credits']; ?></li>
<li class="right"><?php echo $_SESSION['id']; ?></li>

So for some reason, only the $_SESSION['username']; print's out in the html, the credit/id doesn't have a value so it doesn't display anything, is my query right? I think it should work if the username is being displayed.

Answer 1

execute before bindValue ?

    $query->execute();
    $query->bindValue(1, $username);

Should be

    $query->bindValue(1, $username);
    $query->execute();

Also , Your Query is wrong

"SELECT * WHERE user_name = ?"   // SELECT from where?

Should be something like

"SELECT * FROM myTable WHERE user_name = ?"

Answer 2

Execute function should be call after bind value

$query->execute();
$query->bindValue(1, $username);