Question

So I have a class for instance called foo and have two ways of storing data either in mongo or mysql.

at the moment I have something like

namespace vendor;

use bar;
use bar\mysql;

class foo extends bar\mongo {

}

now is there a better way to do it ? I know there is I just don’t know which pattern it is if any.

Answer 1

The principle that can be applied is called:

Favour composition over inheritance

That means in stead of inheriting from those objects, you give the class instances of those objects, and then does operations on it.

For example:

class Mysql
{
    function getItems($what)
    {
        //return items from mysql
    }
}

class MongoDB
{
    function getItems($what)
    {
        //return items from MongoDB    
    }    
}

class Foo
{
    protected $db;

    public function __construct($db)
    {
        $this->$db = $db;
    }

    public function getFooItems()
    {
        $this->db->getItems('foo')    
    }
}

$db = new Mysql();
$foo = new Foo($db)
$foo->getFooItems(); //Will operate on the mysql db

$db1 = new MongoDB();
$foo1 = new Foo($db1);
$foo1->getFooItems(); //Will operate on the MongoDB

I hope this helps