Table of Contents
一、ORM编程思想
1.1 Active Record 设计模式
1.2 调试工具 Laravel Debugbar
二、一对一关系映射
2.1 创建表
2.2 创建模型关系
2.2.1 正向关系绑定
2.2.2 反向关系绑定
2.3 外键
2.4 一对一测试
三、一对多关系映射
3.1 面向对象方式绑定一对多的关系
四、多对多关系映射
4.1 面向对象方式绑定多对多的关系
4.2 访问多对多中间数据表
五、HasManyThrough对象桥接式穿越关联(远层一对多)
五、多样化的一对多关系映射(多态关联)
6. Many-to-Many Polymorphic Association
Home Backend Development PHP Tutorial Analysis of Laravel's Eloquent ORM

Analysis of Laravel's Eloquent ORM

Jul 10, 2018 pm 01:58 PM
eloquent laravel orm

这篇文章主要介绍了关于Laravel之Eloquent ORM ,有着一定的参考价值,现在分享给大家,有需要的朋友可以参考一下

一、ORM编程思想

1.1 Active Record 设计模式

Analysis of Laravels Eloquent ORM

Analysis of Laravels Eloquent ORM

    Active Record 是一种数据访问设计模式,它可以帮助你实现数据对象Object到关系数据库的映射。应用Active Record时,每一个类的实例对象唯一对应一个数据库表的一行(一对一关系)。你只需继承一个abstract Active Record 类就可以使用该设计模式访问数据库,其最大的好处是使用非常简单


Analysis of Laravels Eloquent ORM

Analysis of Laravels Eloquent ORM

1.2 调试工具 Laravel Debugbar

https://github.com/barryvdh/l...

Installation:

composer require barryvdh/laravel-debugbar --dev
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二、一对一关系映射

2.1 创建表

public function up()
    {
        Schema::create('profiles', function (Blueprint $table) {
            $table->increments('id');
            $table->string('phone');
            $table->unsignedInteger('user_id');
            //显示的声明外键:通知数据库根据外键关联表和建立索引,提高运行速度
            $table->foreign('user_id')
                ->references('id')
                ->on('users')
                ->onDelete('cascade');

            $table->timestamps();
        });
    }
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2.2 创建模型关系

2.2.1 正向关系绑定

public function profile()
{
    return $this->hasOne(Profile::class);
}
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2.2.2 反向关系绑定

public function user()
{
    return $this->belongsTo(User::class);
}
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2.3 外键

Analysis of Laravels Eloquent ORM

自定义外键:

return $this->hasOne(Profile::class,'显示指定自定义外键');
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2.4 一对一测试

    依赖注入Request $request,获取当前登录用户$request->user()

Route::get('/test',function (Request $request){
    //反向
//    $profile = \App\Profile::find(1);
//    dd($profile->user);
    $user = $request->user();

//    if (is_null($user->profile)){
//        $user->profile()->create([
//            'phone' => '15801340269'
//        ]);
//    }
    //用firstOrCreate改进if
    $user->profile()->firstOrCreate(['user_id' => $user->id],[

        'phone' => '18363046291'
    ]);

    //访问属性一样访问方法
    dd($user->profile);
});
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三、一对多关系映射

Analysis of Laravels Eloquent ORM

1:N hasMany(XXX:class) 

反之:belongsTo(XXX:class)
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Analysis of Laravels Eloquent ORM

Analysis of Laravels Eloquent ORM

3.1 面向对象方式绑定一对多的关系

Analysis of Laravels Eloquent ORM

四、多对多关系映射

    中间表命名:按照A-Z首字母排序

public function users()
{
    return $this->belongsToMany(User::class);
}

public function habits()
{
    return $this->belongsToMany(Habit::class);
}
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4.1 面向对象方式绑定多对多的关系

Analysis of Laravels Eloquent ORM

detach解绑,sync方法用的比较多,只保留1,2
Analysis of Laravels Eloquent ORM

4.2 访问多对多中间数据表

Analysis of Laravels Eloquent ORM

五、HasManyThrough对象桥接式穿越关联(远层一对多)

数据表:

countries
    id - integer
    name - string

users
    id - integer
    country_id - integer
    name - string

posts
    id - integer
    user_id - integer
    title - string
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class Country extends Model
{
    protected $fillable = ['name'];

    /**
     * 获得某个国家下所有的用户文章。
     */
    public function papers()
    {
        return $this->hasManyThrough(Paper::class,User::class);
    }
}
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$factory->define(App\Paper::class, function (Faker $faker) {
    return [
        'title' => $faker->sentence,
        'user_id' => \App\User::all()->random()->id,
    ];
});
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Analysis of Laravels Eloquent ORM

$factory->define(App\User::class, function (Faker $faker) {
    return [
        'name' => $faker->name,
        'email' => $faker->unique()->safeEmail,
        'country_id' => \App\Country::all()->random()->id,
        'password' => '$2y$10$TKh8H1.PfQx37YgCzwiKb.KjNyWgaHb9cbcoQgpFlYg7B77UdFm', // secret
        'remember_token' => str_random(10),
    ];
});
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Analysis of Laravels Eloquent ORM

获取每个国家论文总数:

Analysis of Laravels Eloquent ORM

五、多样化的一对多关系映射(多态关联)

面向对象多态:运行时加载机制

Analysis of Laravels Eloquent ORM

更多:https://laravel-china.org/doc...
伪造数据:
Analysis of Laravels Eloquent ORM

Analysis of Laravels Eloquent ORM

6. Many-to-Many Polymorphic Association

In addition to traditional polymorphic associations, you can also define "many-to-many" polymorphic associations. For example, the Post model and the Video model can share a polymorphic association to the Tag model. Using a many-to-many polymorphic association allows you to share a unique list of tags across articles and videos.
More: https://laravel-china.org/doc...

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