Zend\Db adapter instantiation through Zend Framework 2 Di

module.config.php

<?php
return array(
    'di' => array(
        'definition' => array(
            //teaching DI to use the factory
            'class' => array(
                'Zend\Db\Db' => array(
                    'methods' => array(
                        'factory' => array(
                            'adapter' => array(
                                'type' => false,
                                'required' => true,
                            ),
                            'config' => array(
                                'type' => false,
                                'required' => false,
                            ),
                        ),
                    ),
                ),
                'Zend\Db\Adapter\AbstractAdapter' => array(
                    'instantiator' => array(
                        'Zend\Db\Db',
                        'factory',
                    ),
                ),
            ),
        ),
        'instance' => array(
            
            'alias' => array(
                //we just know it's an abstract adapter
                'my-db-adapter'    => 'Zend\Db\Adapter\AbstractAdapter',
            ),
            
            //documentmanager
            'my-db-adapter' => array(
                'parameters' => array(
                    'adapter' => array(
                        // same db factory parameters you used in 1.x (I suppose)
                    ),
                ),
            ),
        ),
    ),
);

If you have multiple defined, yes. Otherwise, if you typehint your methods correctly, like following:

    public function __construct(My\Stuff $stuff) {
        $this->stuff = $stuff;
    }

Then, if you defined an alias 'my-stuff' for an instance of type My\Stuff, you could just use Zend\Di\Configuration option 'preference', like following, you should not be worried about defining injections manually every time:

return array(
    'instance' => array(
        'alias' => array(
            'my-stuff' => 'My\Stuff',
        ),
        'preference' => array(
            'My\Stuff' => 'my-stuff', //this will tell Zend\Di to use alias 'my-stuff' when no alias is requested, but an instance of My\Stuff is needed
        ),
    ),
);

That is just an example config. You can find more examples about Zend\Di at https://github.com/ralphschindler/Zend_DI-Examples

Awesome thanks for the help!