Using PDO to echo display all rows from a table [duplicate]

Answer 1

change:

while ($row = $db->fetchAll(PDO::FETCH_ASSOC))
{
$title = $row['title'];
$body = $row['body'];
}

to:

while ($row = $result->fetch(PDO::FETCH_ASSOC))
{
$title = $row['title'];
$body = $row['body'];
}

Answer 2

Which keeps giving me Call to undefined method PDO::fetchAll()

This should have given you the hint, that you are using the wrong object. It's PDOStatement::fetchAll as you can see in your second example, or if you want to use it in a while loop PDOStatement::fetch:

while ($row = $result->fetch(PDO::FETCH_ASSOC))
{
    $title = $row['title'];
    $body = $row['body'];
}

Additional notes:

1. $result is a misleading variable name as you might see from the $result->execute() line. You don't execute a result, you execute a statement. This is why in the manual $stmt or $sth (statement handle i guess) are used.
2. The echo lines should be inside the while loop, otherwise you overwrite again and again, then output only the last row.