如何从数据库中(Entity Provider)加载Security用户

// src/AppBundle/Entity/User.php
namespace AppBundle\Entity;
 
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Security\Core\User\UserInterface;
 
/**
 * @ORM\Table(name="app_users")
 * @ORM\Entity(repositoryClass="AppBundle\Entity\UserRepository")
 */
class User implements UserInterface, \Serializable
{
    /**
     * @ORM\Column(type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;
 
    /**
     * @ORM\Column(type="string", length=25, unique=true)
     */
    private $username;
 
    /**
     * @ORM\Column(type="string", length=64)
     */
    private $password;
 
    /**
     * @ORM\Column(type="string", length=60, unique=true)
     */
    private $email;
 
    /**
     * @ORM\Column(name="is_active", type="boolean")
     */
    private $isActive;
 
    public function __construct()
    {
        $this->isActive = true;
        // may not be needed, see section on salt below
        // 非必须，参考下文中的salt讲解
        // $this->salt = md5(uniqid(null, true));
    }
 
    public function getUsername()
    {
        return $this->username;
    }
 
    public function getSalt()
    {
        // you *may* need a real salt depending on your encoder
        // see section on salt below
        // 根据你的encoder，你 *可能* 需要一个真正的 salt，参考下文中的salt讲解
        return null;
    }
 
    public function getPassword()
    {
        return $this->password;
    }
 
    public function getRoles()
    {
        return array('ROLE_USER');
    }
 
    public function eraseCredentials()
    {
    }
 
    /** @see \Serializable::serialize() */
    public function serialize()
    {
        return serialize(array(
            $this->id,
            $this->username,
            $this->password,
            // 参考下文中的salt讲解
            // $this->salt,
        ));
    }
 
    /** @see \Serializable::unserialize() */
    public function unserialize($serialized)
    {
        list (
            $this->id,
            $this->username,
            $this->password,
            // see section on salt below
            // 参考下文中的salt讲解
            // $this->salt
        ) = unserialize($serialized);
    }
}

// src/AppBundle/Entity/User.php
 
use Symfony\Component\Security\Core\User\AdvancedUserInterface;
// ...
 
class User implements AdvancedUserInterface, \Serializable
{
    // ...
 
    public function isAccountNonExpired()
    {
        return true;
    }
 
    public function isAccountNonLocked()
    {
        return true;
    }
 
    public function isCredentialsNonExpired()
    {
        return true;
    }
 
    public function isEnabled()
    {
        return $this->isActive;
    }
 
    // serialize and unserialize must be updated - see below
    // 序列化和反序列化必须要更新 - 见下
    public function serialize()
    {
        return serialize(array(
            // ...
            $this->isActive
        ));
    }
    public function unserialize($serialized)
    {
        list (
            // ...
            $this->isActive
        ) = unserialize($serialized);
    }
}

// src/AppBundle/Entity/UserRepository.php
namespace AppBundle\Entity;
 
use Symfony\Bridge\Doctrine\Security\User\UserLoaderInterface;
use Doctrine\ORM\EntityRepository;
 
class UserRepository extends EntityRepository implements UserLoaderInterface
{
    public function loadUserByUsername($username)
    {
        return $this->createQueryBuilder('u')
            ->where('u.username = :username OR u.email = :email')
            ->setParameter('username', $username)
            ->setParameter('email', $username)
            ->getQuery()
            ->getOneOrNullResult();
    }
}