Getting database adapter in a model in zend framework 2 - php

Question

I am a zf1 developer. I started zf2. I am creating a Authentication module. I created a Auth class as mentioned in the doc
<?php
namespace Application\Model;
use Zend\Authentication\Adapter\AdapterInterface;
use Zend\Authentication\Adapter\DbTable as AuthAdapter;
class Myauth implements AdapterInterface {
/**
* Sets username and password for authentication
*
* #return void
*/
public function __construct($username, $password) {
// Configure the instance with constructor parameters...
$authAdapter = new AuthAdapter($dbAdapter,
'users',
'username',
'password'
);
$authAdapter
->setTableName('users')
->setIdentityColumn('username')
->setCredentialColumn('password');
$result = $authAdapter->authenticate();
if (!$result->isValid()) {
// Authentication failed; print the reasons why
foreach ($result->getMessages() as $message) {
echo "$message\n";
}
} else {
// Authentication succeeded
// $result->getIdentity() === $username
}
}
}
Issue1 : How to get $dbAdapter here?
Issue2 : Is this correct way to create auth module?

Answer 1

I have a couple things to say:
1. About Database Adapter
This link shows you how to configure database adapter.
In config/autoload/global.php:
return array(
'db' => array(
'driver' => 'Pdo',
'dsn' => 'mysql:dbname=zf2tutorial;host=localhost',
'driver_options' => array(
PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES \'UTF8\''
),
),
'service_manager' => array(
'factories' => array(
'Zend\Db\Adapter\Adapter'
=> 'Zend\Db\Adapter\AdapterServiceFactory',
),
),
);
In config/autoload/local.php:
return array(
'db' => array(
'username' => 'YOUR USERNAME HERE',
'password' => 'YOUR PASSWORD HERE',
),
)
Now, from ServiceLocatorAware classes, you can get Database Adapter as
$dbAdapter = $this->getServiceLocator()->get('Zend\Db\Adapter\Adapter');
2. About Creating Authentication
Dude, why reinvent the square wheel? As mentioned here, ZfcUser is built to be a foundation for a very large percentage for Zend Framework 2 applications.
Nearly anything is customizable as mentioned here. A lot of modules are available such as ScnSocialAuth which have dependancy on ZfcUser and are really awesome.

Answer 2

As in ZF 2, Models are not ServiceLocatorAware classes, so you cannot use the solution in Ojjwal Ojha's answer.
You can:
1. Get dbAdapter in your Controller by calling:
$dbAdapter = $this->getServiceLocator()->get('Zend\Db\Adapter\Adapter');
Pass dbAdapter to your Model when you create it:
$model = new Model($dbAdapter);
Write an init function in your Model.