1. The document discusses configuring and using Doctrine ORM with Symfony to manage database entities. It covers setting up the database connection, creating entity classes and mapping metadata, generating schema and repositories, and performing CRUD operations. 2. Relationships like many-to-many are demonstrated through tagging clips with multiple tags. 3. Additional Doctrine features covered include lifecycle callbacks, custom repositories, and the Gedmo extensions.

1. Symfony2
Database and Doctrine

2. ORM (Object-relational mapping)

3. Configuring the Database
# app/config/parameters.yml
parameters:
database_driver: pdo_mysql
database_host: localhost
database_name: test_project
database_user: root
database_password: password

4. Creating the database
$ php app/console doctrine:database:create

5. Creating an Entity Class
// src/Volcano/VideostatusBundle/Entity/Clip.php
namespace VolcanoVideostatusBundleEntity;
class Clip
{
protected $id;
protected $url;
protected $timeStart;
protected $timeFinish;
}

6. Creating Mapping Info
// src/Volcano/VideostatusBundle/Entity/Clip.php
namespace VolcanoVideostatusBundleEntity;
use DoctrineORMMapping as ORM;
/**
* @ORMEntity
* @ORMTable(name="clip", indexes={
* @ORMIndex(name="clip_url_idx",columns={"url"}
* })
*/
class Clip
{ }

7. Creating Mapping Info
/**
* @ORMId
* @ORMColumn(type="integer")
* @ORMGeneratedValue(strategy="AUTO")
*/
protected $id;

8. Creating Mapping Info
/**
* @ORMColumn(type="string", length=255)
*/
protected $url;

9. Creating Mapping Info
/**
* @ORMColumn(name="time_start", type="integer")
*/
protected $timeStart;

10. Generating Setters and
Getters
$ php app/console doctrine:generate:entities |
VolcanoVideostatusBundleEntityClip

11. Creating the schema
$ php app/console doctrine:schema:update --force

12. Persisting object
// src/Volcano/VideostatusBundle/Controller/ClipController.php
use SymfonyComponentHttpFoundationResponse;
use VolcanoVideostatusBundleEntityClip;
public function createAction()
{
$clip = new Clip();
$clip->setUrl('http://www.youtube.com/watch?v=PYtXuBN1Hvc');
$clip->setTimeStart(52);
$clip->setTimeFinish(54);
$em = $this->getDoctrine()->getManager();
$em->persist($clip);
$em->flush();
return new Response('Created clip id '.$clip->getId());
}

13. Unit Of Work
DB
Entity
EM
Persist
Application
Update
Delete
Flush

14. Fetching object
$repository = $this->getDoctrine()
->getRepository('VolcanoVideostatusBundle:Clip');
$clip = $repository->find($id);
$clip = $repository->findOneByUrl('http://www.youtube.com/watch?v=PYtXuBN1Hvc');
$clips = $repository->findByUrl('http://www.youtube.com/watch?v=PYtXuBN1Hvc');
$clips = $repository->findAll();
$clips = $repository->findBy(
array('url' => 'http://www.youtube.com/watch?v=PYtXuBN1Hvc'),
array('timeStart' => '0')
);

15. Updating object
public function updateAction($id)
{
$em = $this->getDoctrine()->getManager();
$clip = $em->getRepository('VolcanoVideostatusBundle:Clip')->find($id);
if (!$clip) {
throw $this->createNotFoundException(
'No clip found for id '.$id
);
}
$clip->setTimeFinish(55);
$em->flush();
return $this->redirect($this->generateUrl('homepage'));
}

16. Deleting object
$em = $this->getDoctrine()->getManager();
$clip = $em->getRepository('VolcanoVideostatusBundle:
Clip')
->find($id);
$em->remove($clip);
$em->flush();

17. DQL
$em = $this->getDoctrine()->getManager();
$query = $em->createQuery(
'SELECT c FROM VolcanoVideostatusBundle:Clip c WHERE c.
timeFinish - c.timeStart > :delta ORDER BY p.id ASC'
)->setParameter('delta', 10);
$clips = $query->getResult();

18. DQL - query builder
$repository = $this->getDoctrine()
->getRepository('VolcanoVideostatusBundle:Clip');
$query = $repository->createQueryBuilder('c')
->where('c.timeFinish - c.timeStart > :delta')
->setParameter('delta', 10)
->orderBy('c.id', 'ASC')
->getQuery();
$clips = $query->getResult();

19. Custom Repository
// src/Volcano/VideostatusBundle/Entity/Clip.php
namespace VolcanoVideostatusBundleEntity;
use DoctrineORMMapping as ORM;
/**
* @ORMEntity(repositoryClass="VolcanoVideostatusBundleRepositoryClipRepository")
* @ORMTable(name="clip")
*/
class Clip
{ }

20. Custom Repository
//src/Volcano/VideostatusBundle/Repository/ClipRepository.php
namespace VolcanoVideostatusBundleRepository;
use DoctrineORMEntityRepository;
class ClipRepository extends EntityRepository
{
public function findAllLongerThan($length)
{
$query = $repository->createQueryBuilder('c')
->where('c.timeFinish - c.timeStart > :delta')
->setParameter('delta', intval($length))
->orderBy('c.id', 'ASC')
->getQuery();
return $query->getResult();
}
}

21. Relationships
Many To Many
Clip
Fun
Котята
Сиськи
Clip

22. Many To Many Association
/**
* @ORMEntity
*/
class Clip
{
/**
* @ORMManyToMany(targetEntity="Tag", inversedBy="clips")
* @ORMJoinTable(name="clips_tags")
**/
private $tags;
public function __construct() {
$this->groups = new ArrayCollection();
}
}

23. Many To Many Association
/**
* @ORMEntity
*/
class Tag
{
/**
* @ORMManyToMany(targetEntity="Clip", mappedBy="tags")
**/
private $clips;
public function __construct() {
$this->clips = new ArrayCollection();
}
}

24. Many To Many Association
CREATE TABLE Clip (
id INT AUTO_INCREMENT NOT NULL,
PRIMARY KEY(id)
) ENGINE = InnoDB;
CREATE TABLE clips_tags (
clip_id INT NOT NULL,
tag_id INT NOT NULL,
PRIMARY KEY(clip_id, tag_id)
) ENGINE = InnoDB;
CREATE TABLE Tag (
id INT AUTO_INCREMENT NOT NULL,
PRIMARY KEY(id)
) ENGINE = InnoDB;
ALTER TABLE clips_tags ADD FOREIGN KEY (clip_id) REFERENCES Clip(id);
ALTER TABLE clips_tags ADD FOREIGN KEY (tag_id) REFERENCES Tag(id);

25. Persisting object
public function createAction()
{
$clip = new Clip();
$clip->setUrl('http://www.youtube.com/watch?v=PYtXuBN1Hvc');
$tag1 = new Tag();
$tag1->setName('Fun');
$tag2 = new Tag();
$tag2->setName('Котята');
$clip->addTag($tag1);
$clip->addTag($tag2);
$em = $this->getDoctrine()->getManager();
$em->persist($tag1);
$em->persist($tag2);
$em->persist($clip);
$em->flush();
return new Response('Created clip id '.$clip->getId());
}

26. Fetching Related Objects
public function showClipTagsAction($id)
{
$clip = $this->getDoctrine()
->getRepository('VolcanoVideostatusBundle:Clip')->find($id);
$tags = $clip->getTags();
return array('tags' => $tags);
}
<div class="tags">
<div class="tags-list">
{% for tag in tags %}
<a class="label" href="#">{{tag.name}}</a>
{% endfor %}
</div>
</div>

27. Fetching Related Objects
<?php
// src/Volcano/VideostatusBundle/Entity/ClipRepository.php
public function findOneByIdJoinedToTags($id)
{
$query = $this->getEntityManager()
->createQuery('
SELECT c, t FROM VideostatusBundle:Clip c
JOIN c.tags t
WHERE c.id = :id'
)->setParameter('id', $id);
try {
return $query->getSingleResult();
} catch (DoctrineORMNoResultException $e) {
return null;
}
}

28. Lifecycle Callbacks
/**
* @ORMEntity()
* @ORMHasLifecycleCallbacks()
*/
class Clip
{
//....
/**
* @ORMPrePersist
*/
public function setCreatedValue()
{
$this->created = new DateTime();
}
}

29. Lifecycle Callbacks
● preRemove
● postRemove
● prePersist
● postPersist
● preUpdate
● postUpdate

30. Gedmo 2 Doctrine Extensions
/**
* @ORMEntity
*/
class Clip
{
/*
* @GedmoSlug(fields={"title"}, unique=true)
*/
protected $slug;
protected $title;
}

31. Gedmo 2 Doctrine Extensions
class Clip
{
/**
* @GedmoTimestampable(on="create")
* @ORMColumn(name="created", type="datetime")
*/
private $created;
/**
* @ORMColumn(name="updated", type="datetime")
* @GedmoTimestampable(on="update")
*/
private $updated;
}

32. Gedmo 2 Doctrine Extensions
● Tree
● Translatable
● Sluggable
● Timestampable
● Loggable
● Softdeleteable
● Uploadable