Question

I am wondering whether or not it is possible to elegantly map the results of a PDO query to an array member in a class rather than have them floating about as public properties of that object.

Say I have the (condensed) following:

class DBObject {

    protected
        $record = array();

    function __construct(array $record) {
        if(!empty($record)) {
            $this->loadRecord($record);
        }
    }
}

Ideally, I want to call the constructor with an array of values passed from the database, rather than use __set or any other weird methods. So using PDO’s existing API would be great.

My rough get_all function at the moment has got this far:

static function get_all() {
    $class = get_called_class();
    $results = DB::factory()->query('SELECT * FROM ' . $class . ' ORDER BY ID');
    $results->setFetchMode(PDO::FETCH_CLASS|PDO::FETCH_PROPS_LATE, $class);
    return $results;
}

NB: I’m running PHP 5.3 and MySQL through PDO, and already know this problem is solveable using __set, but I explicitly want to avoid using it in favour of something more performant.

Answer 1

Removed previous code

---

Right, can’t you do something like this:

class DBObject {

    protected $record = array();

    function __construct($record = null) {
        if(null === $record){
            $obj_vars = get_object_vars($this);
            $cls_vars = get_class_vars(get_class($this));
            $this->$record = array_diff_key($obj_vars, $cls_vars);
        }else{
            $this->record = $record;
        }
    }
}

The problem with this however is that the values are still available as public members.
But what it will do is compare ‘pre-defined’ (class) members to the actual (object) members.

Since PDO will create new members in the object you can use array_diff_key to get the ‘new’ members.

Yes, this will still not pass them through your constructor.