PHP编程：Laravel 5框架学习之Eloquent （laravel 的ORM）

发布时间：2020-12-14 19:51:58 所属栏目：大数据来源：网络整理

导读：《Laravel 5框架学习之Eloquent （laravel 的ORM）》要点：本文介绍了Laravel 5框架学习之Eloquent （laravel 的ORM），希望对您有用。如果有疑问，可以联系我们。我们来生成第一个模型 PHP实战代码如下: php artisan make:model Article #输出 Model cre

《Laravel 5框架学习之Eloquent （laravel 的ORM）》要点：
本文介绍了Laravel 5框架学习之Eloquent （laravel 的ORM），希望对您有用。如果有疑问，可以联系我们。

我们来生成第一个模型PHP实战

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.phpPHP实战

<?php namespace App;
use IlluminateDatabaseEloquentModel;
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.PHP实战

tinker 是 laravel提供的命令行工具,可以和项目进行交互.
PHP实战

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 AppArticle;
=> <AppArticle #000000005c4b7ee400000000ab91a676> {}
>>> $article->title = 'My First Article';
=> "My First Article"
>>> $article->body = 'Some content...';
=> "Some content..."
>>> $article->published_at = CarbonCarbon::now();
=> <CarbonCarbon #000000005c4b7ee600000000ab91dcb6> {
    date: "2015-03-28 06:37:22",timezone_type: 3,timezone: "UTC"
  }
>>> $article;
=> <AppArticle #000000005c4b7ee400000000ab91a676> {
    title: "My First Article",body: "Some content...",published_at: <CarbonCarbon #000000005c4b7ee600000000ab91dcb6> {
      date: "2015-03-28 06:37:22",timezone: "UTC"
    }
  }
>>> $article->toArray();
=> [
    "title"    => "My First Article","body"     => "Some content...","published_at" => <CarbonCarbon #000000005c4b7ee600000000ab91dcb6> {
      date: "2015-03-28 06:37:22",timezone: "UTC"
    }
  ]
>>> $article->save();
=> true
#查看数据结果,添加了一条记录
>>> AppArticle::all()->toArray();
=> [
    [
      "id"      => "1","title"    => "My First Article","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
>>> AppArticle::all()->toArray();
=> [
    [
      "id"      => "1","title"    => "My First Update Title","updated_at"  => "2015-03-28 06:42:03"
    ]
  ]
  
>>> $article = AppArticle::find(1);
=> <AppArticle #000000005c4b7e1600000000ab91a676> {
    id: "1",title: "My First Update Title",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 = AppArticle::where('body','Some content...')->get();
=> <IlluminateDatabaseEloquentCollection #000000005c4b7e1800000000ab91a676> [
    <AppArticle #000000005c4b7e1b00000000ab91a676> {
      id: "1",updated_at: "2015-03-28 06:42:03"
    }
  ]
>>> $article = AppArticle::where('body','Some content...')->first();
=> <AppArticle #000000005c4b7e1900000000ab91a676> {
    id: "1",updated_at: "2015-03-28 06:42:03"
  }
>>> 
>>> $article = AppArticle::create(['title' => 'New Article','body' => 'New body','published_at' => CarbonCarbon::now()]);
IlluminateDatabaseEloquentMassAssignmentException 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暗码字段,而黑客产生了暗码字段连同我们的其他字段一起送回服务器,这将产生修改暗码的危险,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.PHP实战

修改我们的模型文件 Article.phpPHP实战

<?php namespace App;
use IlluminateDatabaseEloquentModel;
class Article extends Model {
 protected $fillable = [
    'title','body','published_at'
  ];
}

表示,title,body,published_at 是可以直接填充的.PHP实战

退出 tinker,重新进入PHP实战

>>> $article = AppArticle::create(['title' => 'New Article','published_at' => CarbonCarbon::now()]);
=> <AppArticle #000000005051b2c7000000007ec432dd> {
    title: "New Article",body: "New body",published_at: <CarbonCarbon #000000005051b2c6000000007ec4081d> {
      date: "2015-03-28 06:55:19",timezone: "UTC"
    },updated_at: "2015-03-28 06:55:19",created_at: "2015-03-28 06:55:19",id: 2
  }
  
# It's ok
>>> AppArticle::all()->toArray();
=> [
    [
      "id"      => "1","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 = AppArticle::find(2);
=> <AppArticle #000000005051b22b000000007ec432dd> {
    id: "2",title: "New Article",published_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框架有所赞助.PHP实战

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