Doctrine Là Gì

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As a PHPhường. developer, you might have sầu come across the term ORM. ORM is a way to work with databases in the same way you work with classes và objects. If you were khổng lồ delve deeper into lớn how web applications are designed & built, after doing some exploring in their ORM you would find two well-known patterns: Active Record and Data Mapper.

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Active sầu Record refers to mapping an object to a database row. Indeed, each row in the database is tied khổng lồ an object. When you retrieve sầu a row from the database you can update, delete or save using the object itself. That’s how Eloquent and Paris work, and how it’s done in Ruby on Rails.

On the other hand, Data Mapper is a layer of software which separates the in-memory objects from the database. With Data Mapper the in-memory objects needn’t know that there is even a database present. They need no SQL interface gamesbaidoithuong.com or knowledge of the database schema. One such solution is Doctrine.

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What Is Doctrine?

Doctrine is an ORM which implements the data mapper pattern và allows you to make a clean separation of the application’s business rules from the persistence layer of the database.

Some of the advantages I discovered while using Doctrine with Laravel are:

Faster and easier to lớn use. Entities are just plain PHPhường objects. Doctrine utilizes a “gamesbaidoithuong.com first” approach, so you can create entities first, và then generate a database for them automatically. The reverse case is also possible, but I vị not recommend it. Supports annotations, XML and YAML for schema. DQL (a replacement for SQL) abstracts your tables away. Doctrine events allow you to easily hook onkhổng lồ specific database events và persize certain actions. Repositories are more faithful lớn the repository pattern. Transactional write-behind methodology lets Doctrine have sầu less interaction with the Database until the flush() method is called.

Of course, Doctrine has disadvantages too, but it is up lớn the programmer to choose the right ORM.

Doctrine DQL

Dquốc lộ stands for Doctrine Query Language. Dquốc lộ brings you object query language, which means that instead of a traditional relational query, you have queries in object form.

DQL allows you to write database queries in an object-oriented way, which is helpful when you need lớn query the database in a way which cannot be achieved (or is very difficult) using the mặc định repository methods.

Sample DQL Query:

SELECT b.id as ItemId, b.title as ItemTitle , b.url as ItemUrl FROM AlirezaDomainIdentityEntitiesMenu u WHERE u.id =:id

Doctrine Filters

Doctrine allows you to limit query results with Filters. For example, you may want to lớn edit only the information of the logged-in user or make sure the current client’s data was returned from the database. A filter is an automatic solution for remembering specific conditions for all your queries.

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Doctrine provides Squốc lộ màn chơi limitations, so there is no need to lớn maintain the clause in multiple repositories of your project. This enhances security và makes your gamesbaidoithuong.com easier to read.

Let’s look at an example:

/** *
JoinColumn(name="user_id", referencedColumnName="id") **/ private $user;As you can see in the User entity, the result of JoinColumn is limited lớn only items with the condition of WHERE user_id = :user_id.

Setting Up Doctrine 2

To mix up Doctrine, there is a bridge lớn allow for matching with Laravel 5’s existing configuration. To install Doctrine 2 within our Laravel project, we run the following command:

composer require laravel-doctrine/ormAs usual, the package should be added to the app/config.php, as the service provider:

LaravelDoctrineORMDoctrineServiceProvider::class,The alias should also be configured:

"EntityManager" => LaravelDoctrineORMFacadesEntityManager::classFinally, we publish the package configuration with:

php artisan vendor:publish --tag="config"Doctrine needs no database configuration and uses the current Laravel configuration, but if you want to override it you should change the Doctrine config file in Config/doctrine.php:

"managers" => < "default" => < "dev" => env("APP_DEBUG"), "meta" => env("DOCTRINE_METADATA", "annotations"), "connection" => env("DB_CONNECTION", "mysql"), "namespaces" => < "App" >,That’s all there is khổng lồ it.

What Is an Entity?

“Entity” refers to an object which has a distinct identity. An entity must have sầu a specific identifier which is unique throughout the entire system, such as a customer or a student. There would be other objects, such as email addresses, which are not entities, but value objects.

Let’s create a Post Entity App/Entity/Post.php:

namespace AppEntity;use DoctrineORMMapping as ORM;/** *
ORMColumn(type="text") */ private $body; public function __construct($input) $this->setTitle($input<"title">); $this->setBody($input<"body">); public function getId() return $this->id; public function getTitle() return $this->title; public function setTitle($title) $this->title = $title; public function getBody() return $this->body; public function setBody($body) $this->body toàn thân = $body; }The class properties should be the same as the fields in the database table, or you can define them with the
Colum("name"="myfield") annotation.

What Is a Repository?

The repository allows all your gamesbaidoithuong.com lớn use objects without needing to know how the objects are persisted. The repository contains all the knowledge of persistence, including mapping from tables to objects. This provides a more object-oriented view of the persistence layer & makes the mapping gamesbaidoithuong.com more encapsulated.

Now it’s time lớn create the Repository in App/Repository/PostRepo.php:

namespace AppRepository;use AppEntityPost;use DoctrineORMEntityManager;class PostRepo /** *
var EntityManager */ private $em; public function __construct(EntityManager $em) $this->em = $em; public function create(Post $post) $this->em->persist($post); $this->em->flush(); public function update(Post $post, $data) $post->setTitle($data<"title">); $post->setBody($data<"body">); $this->em->persist($post); $this->em->flush(); public function PostOfId($id) return $this->em->getRepository($this->class)->findOneBy(< "id" => $id >); public function delete(Post $post) $this->em->remove($post); $this->em->flush(); /** * create Post *
return Post */ private function prepareData($data) return new Post($data); The Doctrine EntityManager works as the access point for the complete management of your entities.Then, create the Controller App/Http/Controllers/PostController.php:

namespace AppHttpControllers;use AppRepositoryPostRepo as repo;use AppValidationPostValidator;class PostController extends Controller private $repo; public function __construct(repo $repo) $this->repo = $repo; public function edit($id=NULL) return View("admin.index")->with(<"data" => $this->repo->postOfId($id)>); public function editPost() $all = Input::all(); $validate = PostValidator::validate($all); if (!$validate->passes()) return redirect()->back()->withInput()->withErrors($validate); $Id = $this->repo->postOfId($all<"id">); if (!is_null($Id)) $this->repo->update($Id, $all); Session::flash("msg", "edit success"); else $this->repo->create($this->repo->perpare_data($all)); Session::flash("msg", "add success"); return redirect()->back(); public function retrieve() return View("admin.index")->with(<"Data" => $this->repo->retrieve()>); public function delete() $id = Input::get("id"); $data = $this->repo->postOfId($id); if (!is_null($data)) $this->repo->delete($data); Session::flash("msg", "operation Success"); return redirect()->back(); else return redirect()->back()->withErrors("operationFails"); View & routing are the same as usual.

I prefer to lớn create my own Validator based on Laravel’s Validator class. Here’s the Validator AppValidationPostValidator.php:

namespace AppValidation;use Validator;class PostValidator public static function validate($input) Min:4

Conclusion

If you have not previously worked with Doctrine 2, I hope this article has been interesting & informative sầu. Laravel 5 does not use Doctrine, but as you can see, there are some packages which allow us to lớn easily use it with Laravel. I created a simple blog phầm mềm with Laravel 5 và Doctrine ORM, và I hope this can help you lớn create your desired app. I welcome your comments.