analize this code

// Create a connection to the database
$db = mysqli_connect($servername, $username, $password, $dbname);

// Check for a successful connection and handle errors
if (!$db) {
    die("Connection Failed: " . mysqli_connect_error());
}

// To securely fetch data from the database, use prepared statements
function fetchData($db) {
    $query = "SELECT * FROM energy_water_consumption";
    $stmt = mysqli_prepare($db, $query);

    if (!$stmt) {
        die("Query Preparation Failed: " . mysqli_error($db));
    }

    if (mysqli_stmt_execute($stmt)) {
        $result = mysqli_stmt_get_result($stmt);

        while ($row = mysqli_fetch_assoc($result)) {
            // Process the fetched data
            // You can access the columns as $row['column_name']
        }

        mysqli_stmt_close($stmt);
    } else {
        die("Query Execution Failed: " . mysqli_error($db));
    }
}

// Call the function to fetch data (you can replace this with your specific use case)
fetchData($db);

// Close the database connection when done
mysqli_close($db);
?>