'(PDO) Gather specific data from id

i Have an url stands as : http://website.com/update.php?id={NUMBER}

How would I make PDO grabs the results from that specific id?
Here is my attempt for update.php page :

try {
    $dbh = new PDO("mysql:host=$hostname;dbname=vector",$username,$password);

    $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); // <== add this line

  $id = $_GET['id'];

    $sql = "SELECT * FROM users WHERE id = '. $id .'";
foreach ($dbh->query($sql) as $row)
    {
    ?>
    <?php echo $row['username']; ?>
    <?php
    }


    $dbh = null;
    }
catch(PDOException $e)
    {
    echo $e->getMessage();
    }
?>
phpmysqlpdosequelize.js


Solution 1:[1]

I assume your ID is a number so don't use = 'id'

also you should use prepared statments to protect against SQL injection attacks

$sql = "SELECT * FROM users WHERE id = :id";
$bind = array( 'id' => $id );
$sth = $dbh->prepare($sql);
$sth->execute($bind);
$rows = $sth->fetchAll(PDO::FETCH_ASSOC);

foreach ($rows as $row) {
    ...
}

Solution 2:[2]

You need to indicate orderId instead of order_id in associations in order to use a foreign key field properly:

Order.hasMany(OrderItem, { as: 'items', foreignKey: 'orderId' });
OrderItem.belongsTo(Order, { as: 'order', foreignKey: 'orderId' });

Sources

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Source: Stack Overflow

Solution Source
Solution 1
Solution 2 Anatoly

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