Laravel 5框架学习之Eloquent （laravel 的ORM）


            我们来生成第一个模型

复制代码 代码如下:

php artisan make:model Article

#输出

Model created successfully.

Created Migration: 2015_03_28_062517_create_articles_table



查看一下生成的文件 app/Article.php





<?php namespace App;



use Illuminate\Database\Eloquent\Model;



class Article extends Model {



 //



}







没什么特别的，除了继承自 Model 以外，但是具有强大的功能，这些都封装在laravel的Model中。模型自动具有了 save() update() findXXX() 等强大的功能。

tinker 是 laravel提供的命令行工具，可以和项目进行交互。







php artisan tinker



#以下是在tinker中的交互输入

Psy Shell v0.4.1 (PHP 5.4.16 — cli) by Justin Hileman

>>> $name = 'zhang jinglin';

=> "zhang jinglin"



>>> $name

=> "zhang jinglin"



>>> $article = new App\Article;

=> <App\Article #000000005c4b7ee400000000ab91a676> {}



>>> $article->title = 'My First Article';

=> "My First Article"



>>> $article->body = 'Some content...';

=> "Some content..."



>>> $article->published_at = Carbon\Carbon::now();

=> <Carbon\Carbon #000000005c4b7ee600000000ab91dcb6> {

    date: "2015-03-28 06:37:22",

    timezone_type: 3,

    timezone: "UTC"

  }



>>> $article;

=> <App\Article #000000005c4b7ee400000000ab91a676> {

    title: "My First Article",

    body: "Some content...",

    published_at: <Carbon\Carbon #000000005c4b7ee600000000ab91dcb6> {

      date: "2015-03-28 06:37:22",

      timezone_type: 3,

      timezone: "UTC"

    }

  }



>>> $article->toArray();

=> [

    "title"    => "My First Article",

    "body"     => "Some content...",

    "published_at" => <Carbon\Carbon #000000005c4b7ee600000000ab91dcb6> {

      date: "2015-03-28 06:37:22",

      timezone_type: 3,

      timezone: "UTC"

    }

  ]



>>> $article->save();

=> true



#查看数据结果，添加了一条记录



>>> App\Article::all()->toArray();

=> [

    [

      "id"      => "1",

      "title"    => "My First Article",

      "body"     => "Some content...",

      "published_at" => "2015-03-28 06:37:22",

      "created_at"  => "2015-03-28 06:38:53",

      "updated_at"  => "2015-03-28 06:38:53"

    ]

  ]



>>> $article->title = 'My First Update Title';

=> "My First Update Title"



>>> $article->save();

=> true



>>> App\Article::all()->toArray();

=> [

    [

      "id"      => "1",

      "title"    => "My First Update Title",

      "body"     => "Some content...",

      "published_at" => "2015-03-28 06:37:22",

      "created_at"  => "2015-03-28 06:38:53",

      "updated_at"  => "2015-03-28 06:42:03"

    ]

  ]

  

>>> $article = App\Article::find(1);

=> <App\Article #000000005c4b7e1600000000ab91a676> {

    id: "1",

    title: "My First Update Title",

    body: "Some content...",

    published_at: "2015-03-28 06:37:22",

    created_at: "2015-03-28 06:38:53",

    updated_at: "2015-03-28 06:42:03"

  }



>>> $article = App\Article::where('body', 'Some content...')->get();

=> <Illuminate\Database\Eloquent\Collection #000000005c4b7e1800000000ab91a676> [

    <App\Article #000000005c4b7e1b00000000ab91a676> {

      id: "1",

      title: "My First Update Title",

      body: "Some content...",

      published_at: "2015-03-28 06:37:22",

      created_at: "2015-03-28 06:38:53",

      updated_at: "2015-03-28 06:42:03"

    }

  ]



>>> $article = App\Article::where('body', 'Some content...')->first();

=> <App\Article #000000005c4b7e1900000000ab91a676> {

    id: "1",

    title: "My First Update Title",

    body: "Some content...",

    published_at: "2015-03-28 06:37:22",

    created_at: "2015-03-28 06:38:53",

    updated_at: "2015-03-28 06:42:03"

  }

>>> 



>>> $article = App\Article::create(['title' => 'New Article', 'body' => 'New body', 'published_at' => Carbon\Carbon::now()]);

Illuminate\Database\Eloquent\MassAssignmentException with message 'title'







MassAssignmentException，laravel保护我们不能直接插入记录。比如，在一些特殊情况下我们需要直接利用表单的信息填充数据库记录，但是如果我们并没有在表单中添加密码字段，而黑客产生了密码字段连同我们的其他字段一起送回服务器，这将产生修改密码的危险，所以我们必须明确的告诉laravel我们的模型那些字段是可以直接填充的。

修改我们的模型文件 Article.php





<?php namespace App;



use Illuminate\Database\Eloquent\Model;



class Article extends Model {



 protected $fillable = [

    'title',

    'body',

    'published_at'

  ];



}







表示，title, body, published_at 是可以直接填充的。

退出 tinker，重新进入





>>> $article = App\Article::create(['title' => 'New Article', 'body' => 'New body', 'published_at' => Carbon\Carbon::now()]);

=> <App\Article #000000005051b2c7000000007ec432dd> {

    title: "New Article",

    body: "New body",

    published_at: <Carbon\Carbon #000000005051b2c6000000007ec4081d> {

      date: "2015-03-28 06:55:19",

      timezone_type: 3,

      timezone: "UTC"

    },

    updated_at: "2015-03-28 06:55:19",

    created_at: "2015-03-28 06:55:19",

    id: 2

  }

  

# It's ok



>>> App\Article::all()->toArray();

=> [

    [

      "id"      => "1",

      "title"    => "My First Update Title",

      "body"     => "Some content...",

      "published_at" => "2015-03-28 06:37:22",

      "created_at"  => "2015-03-28 06:38:53",

      "updated_at"  => "2015-03-28 06:42:03"

    ],

    [

      "id"      => "2",

      "title"    => "New Article",

      "body"     => "New body",

      "published_at" => "2015-03-28 06:55:19",

      "created_at"  => "2015-03-28 06:55:19",

      "updated_at"  => "2015-03-28 06:55:19"

    ]

  ]



>>> $article = App\Article::find(2);

=> <App\Article #000000005051b22b000000007ec432dd> {

    id: "2",

    title: "New Article",

    body: "New body",

    published_at: "2015-03-28 06:55:19",

    created_at: "2015-03-28 06:55:19",

    updated_at: "2015-03-28 06:55:19"

  }



>>> $article->update(['body' => 'New Updaet Body']);

=> true



#update自动调用save()





以上所述就是本文的全部内容了，希望能够对大家学习Laravel5框架有所帮助。