Playing with PHP, CouchDB and ORM


I’m playing with PHP and CouchDB. After writing a class to connect PHP and CouchDB I’ve done a variation of the interface to use CouchDB with PHP in a similar way to ORM. Yes. I know ORM means Object Relational Mapping and CouchDB isn’t a Relational Database but have a look to the following interface:

Imagine you have a CouchDb at localhost:5987 and you have a database called users.

Now let’s build a class called CDB_Users.

class CDB_Users extends Nov_CouchDb_Orm {
    static $_db = 'users';
}

It’s easy to automate the creation of CDB_Users with a script

CDB_Users extends Nov_CouchDb_Orm

class Nov_CouchDb_Orm
{
    static protected $_db;

    /**
     * @param string $key
     * @return Nov_CouchDb
     */
    static public function connect($key)
    {
        $class = get_called_class();
        extract(Nov_CouchDb_Conf::get($key));

        $couchDb = new Nov_CouchDb($host, $port, $protocol, $user, $password);
        return $couchDb->db($class::$_db);
    }
}

A configuration class:

class Nov_CouchDb_Conf
{
    const CDB1 = 'CDB1';

    private static $_conf = array(
        self::CDB1 => array(
            'protocol' => 'http',
            'host'     => 'localhost',
            'port'     => 5984,
            'user'     => null,
            'password' => null
            )
        );

    static function get($key)
    {
        return self::$_conf[$key];
    }
}

Putting all together with the class Nov_CouchDb
we can use:

CDB_Users::connect(Nov_CouchDb_Conf::CDB1)->insert('gonzalo', array('password' => 'g1'));
$data = CDB_Users::connect(Nov_CouchDb_Conf::CDB1)->select('gonzalo')->asArray();
print_r($data);

CDB_Users::connect(Nov_CouchDb_Conf::CDB1)->update('gonzalo', array('password' => 'g2'));
$data = CDB_Users::connect(Nov_CouchDb_Conf::CDB1)->select('gonzalo')->asArray();
print_r($data);

CDB_Users::connect(Nov_CouchDb_Conf::CDB1)->delete('gonzalo');

What do you think? That’s not exactly a ORM. I’m not sure if I will use that interface instead the classic one.

$data = CDB_Users::connect(Nov_CouchDb_Conf::CDB1)->select('gonzalo')->asArray();
// versus
$couchDb = new Nov_CouchDb('localhost', 5984);
$data = $couchDb->db('users')->select('gonzalo')->asArray()
 

Here is the full source code with the examples.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.