Laravel 5框架学习之Eloquent （laravel 的ORM）

2020-03-22 20:25:44

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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;html' target='_blank'>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。PHP教程

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