What are the characteristics of Laravel's eloquent?

Look at the official document, feel eloquent this ORM basically all frameworks have to do ah, chain call what is not the essence of what, other frameworks have encapsulated a variety of database operations. Why is it that eloquent is laravel very powerful place, what is its characteristic?

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Look at the official document, feel eloquent this ORM basically all frameworks have to do ah, chain call what is not the essence of what, other frameworks have encapsulated a variety of database operations. Why is it that eloquent is laravel very powerful place, what is its characteristic?

Simple, efficient, elegant

Basic Features

phpUser::first(); // 得到第一个 User 对象User::find(10); // 得到 id = 10 的 User 对象User::where('name', 'john')->first(); // 得到第一个 name = john 的 User 对象User::where('name', 'john')->get(); // 得到 name = john 的 User 对象组User::where('name', 'john')->get()->toArray(); // 得到 name = john 的 User 对象数组Article::where('id', '>=', 10)->where('id', '<=', 20)->orderBy('updated_at', 'desc')->get(); // 得到 Article id 在 10~20 的对象组

Advanced Features

Page out

Back-End Code:

phpreturn View::make('users')->withUsers(User::paginate(20));

Front-end Code users.blade.php:

php


  
   
   

     @foreach ($users as $user) 
    
id：{{ $user->id }}name：{{ $user->name }}
@endforeach 
   
{{ $users->links() }}

Laravel automatically maintains the component page indicator and links automatically. The paging feature has been completely completed.

Relationship between models

For an example of a one-to-many relationship, get all the articles written by the user ID = 10:

phpclass User extends Eloquent {  protected $table = 'users';  public function hasManyArticles()  {    return $this->hasMany('Article', 'user_id', 'id');  }}

Made:

php$userWithArticles = User::find(10)->hasManyArticles()->get();

Result: The $userWithArticles is a standard user object, plus $userWithArticles->hasmanyarticles's value is the group of objects for all articles written by that user.

More about the relationship between models can be consulted: in-depth understanding of Laravel eloquent (iii)--Model Relationship (association)

Compared to the "modern" PHP framework, the copy is written for the original without the framework/ORM programmer, compared to the direct spell sql,eloquent of course is very powerful in function, but relative to the same genus ActiveRecord propel and mapper/ Proxy mode of the doctrine, there is no qualitative difference.

Additions and deletions to the search will not say, say a few other frames may not have
Pre-loading at 1.relation
n + 1 query problem to reduce ORM

2. Caching
Execute User::find (1) repeatedly, and SQL executes once.

3. Model Viewer
The Observer mode is used to monitor the operation of the model.

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