Laravel 5框架学习之Eloquent （laravel 的ORM）

Laravel  /  管理员 发布于 8年前   171

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

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;=>  {}>>> $article->title = 'My First Article';=> "My First Article">>> $article->body = 'Some content...';=> "Some content...">>> $article->published_at = Carbon\Carbon::now();=>  {    date: "2015-03-28 06:37:22",    timezone_type: 3,    timezone: "UTC"  }>>> $article;=>  {    title: "My First Article",    body: "Some content...",    published_at:  {      date: "2015-03-28 06:37:22",      timezone_type: 3,      timezone: "UTC"    }  }>>> $article->toArray();=> [    "title"    => "My First Article",    "body"     => "Some content...",    "published_at" =>  {      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);=>  {    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();=>  [     {      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();=>  {    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
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()]);=>  {    title: "New Article",    body: "New body",    published_at:  {      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);=>  {    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。
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