玩转laravel5.4的入门动作（二）

做个文章的增删改查

第一步把数据库的表结构建好，生成迁移

1 怎么建，当然是用php artisan命令了

使用 Artisan 命令 make:migration 来创建一个新的迁移：

php artisan make:migration create_article_table

2 新的迁移位于 database/migrations 目录下，每个迁移文件名都包含时间戳从而允许 Laravel 判断其顺序。

找到 2017_08_12_021758_create_article_table.php 文件

在public function up 把建表语句建好

 public function up()

    {

         Schema::create('article', function (Blueprint $table) {

            $table->increments('id');

            $table->string('title', 100);

            $table->text('description');

            $table->timestamps();

        });

    }

public function down 就是删除表

   public function down()

    {

        Schema::drop('article');

    }

3 运行数据迁移就是建表语句的创建

php artisan migrate

默认的 user 表和password_resets 报错把 user表的unique和password表的创建索引给去掉

执行成功，查看article表创建完毕

表建立完毕了，那么用系统自带的工具 orm模型自动创建增删改

1创建模型，还是使用命令

php artisan make:model Article

生成的文件在 blogapp下

2 模型建立完毕，可以获取模型了

为了方便测试，手工在数据库的article表中，随便插入2条数据，

然后在控制器中调用模型中的数据来查看

在 blogappArticle.php 中增加表的名字

protected $table = 'article';

3 在控制器调用数据看下

控制器顶部增加 use AppArticle;

函数中增加

$articles = Article::all();

foreach ($articles as $article) {

echo $article->title;

}

4 查看下数据

好了，基础的测试通了，咱们开始增删改了

1 先给article创建个控制器

php artisan make:controller ArticleController

生成的文件在 blogappHttpControllers 这个目录下

2 设置路由规则可访问 articlecontroller的函数

在blog/routes/web.php

Route::resource('article', 'ArticleController');

Route::get('article/show/{id}', 'ArticleController@show');

添加如下第一个是设置文章控制器和内部的方法可用

第二个是设置URL 访问文章控制器的show方法

3 填充文章控制器

<?php

namespace AppHttpControllers;

use IlluminateHttpRequest;
use AppArticle;

class ArticleController extends Controller
{
    /**
     * 添加文章
     */
    public function store(Request $request)
    {
        $article = new Article;
        $article->title = $request->input('title');
        $article->description = $request->input('description');
        if ($article->save()) {
            return redirect('article');
        } else {
            return back()->withInput()->withErrors('保存失败');
        }
    }
    
    
    /**
     * 更新文章
     */
    public function update(Request $request,$id)
    {
        $article = Article::find($id); 
        $article->title = $request->input('title');
        $article->description = $request->input('description');

        
        
        if ($article->save()) {
            return redirect('article');
        } else {
            return back()->withInput()->withErrors('保存失败');
        }
    }
    
    /**
    文章添加展示页
    **/
    public function create()
    {
        return view('article.create');
    }
    
    //文章更新展示页
    public function edit($id)
    {
        $article=Article::find($id);

        return view('article.edit',compact('article'));
    }
    
    //文章删除
     public function destroy($id)
    {
        $article = Article::find($id);
        $article->delete();
        return redirect('article');
    }
    
    //文章列表
    public function index()
    {
        $articles = Article::all();
         return view('article.index',compact('articles'));
    }
    
    
    //文章显示
    public function show($id)
    {
        $article=Article::find($id);

        return view('article.show',compact('article'));
    }
}

4 设置模板页

模板页面位置在blog esourcesviews 这个位置

1）在viewslayoutsapp.blade.php 改成如下代码

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>test</title>

</head>
<body>
<nav class="navbar navbar-default">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
<span class="sr-only">Toggle Navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">后台管理系统</a>
</div>

<ul class="nav navbar-nav navbar-right">
@if (Auth::guest())
<li><a href="{{ route('login') }}">登录</a></li>
<li><a href="{{ route('register') }}">注册</a></li>
@else
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">{{ Auth::user()->name }} <span class="caret"></span></a>
<ul class="dropdown-menu" role="menu">
<li><a href="{{ route('logout') }}" onclick="event.preventDefault();
document.getElementById('logout-form').submit();">退出</a></li>
<form id="logout-form" action="{{ route('logout') }}" method="POST" style="display: none;">
{{ csrf_field() }}
</form>
</ul>
</li>
@endif
</ul>
</div>
</div>
</nav>

@yield('content')

<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.1/js/bootstrap.min.js"></script>
</body>
</html>

2)我们新建一个article文件夹

新建4个模板文件

create.blade.php

@extends('layouts.app')
        
@section('content')
<div class="container">  
  <div class="row">
    <div class="col-md-10 col-md-offset-1">
      <div class="panel panel-default">
        <div class="panel-heading">新增文章</div>

        <div class="panel-body">

          @if (count($errors) > 0)
            <div class="alert alert-danger">
              <strong>Whoops!</strong> There were some problems with your input.<br><br>
              <ul>
                @foreach ($errors->all() as $error)
                  <li>{{ $error }}</li>
                @endforeach
              </ul>
            </div>
          @endif

          <form action="{{ URL('article') }}" enctype="multipart/form-data" method="POST">
            <input type="hidden" name="_token" value="{{ csrf_token() }}">
            文章标题：<input type="text" name="title" class="form-control" required="required">
            <br>
         
            <br>
           
           
            文章内容： <textarea name="description" rows="10" class="form-control"></textarea>
            <br>
            <button class="btn btn-lg btn-info">新增文章</button>
          </form>

        </div>
      </div>
    </div>
  </div>
</div>  
@endsection

edit.blade.php

@extends('layouts.app')

@section('content')
<div class="container">  
  <div class="row">
    <div class="col-md-10 col-md-offset-1">
      <div class="panel panel-default">
        <div class="panel-heading">编辑文章</div>

        <div class="panel-body">

          @if (count($errors) > 0)
            <div class="alert alert-danger">
              <strong>Whoops!</strong> There were some problems with your input.<br><br>
              <ul>
                @foreach ($errors->all() as $error)
                  <li>{{ $error }}</li>
                @endforeach
              </ul>
            </div>
          @endif

          <form action="{{ URL('article/'.$article->id) }}" enctype="multipart/form-data" method="POST">
            <input name="_method" type="hidden" value="PUT">
            <input type="hidden" name="_token" value="{{ csrf_token() }}">
            文章标题：<input type="text" name="title" class="form-control" required="required" value="{{ $article->title }}">
            <br>
             
            <br>
         
             <br>
     文章内容：<textarea name="description" rows="10" class="form-control" required="required">{{ $article->description }}</textarea>
            <br>
            <button class="btn btn-lg btn-info">编辑文章</button>
          </form>

        </div>
      </div>
    </div>
  </div>
</div>  
@endsection

index.blade.php

@extends('layouts.app')

@section('content')
<div class="container">  
  <div class="row">
    <div class="col-md-10 col-md-offset-1">
      <div class="panel panel-default">
        <div class="panel-heading">管理文章</div>

        <div class="panel-body">
        <a href="{{ URL('article/create') }}" class="btn btn-lg btn-primary">新增</a>
        <table class="table table-striped">
          <tr class="row">
            <th class="col-lg-4">内容</th>
            <th class="col-lg-2">标题</th>
            <th class="col-lg-4">查看</th>
            <th class="col-lg-1">编辑</th>
            <th class="col-lg-1">删除</th>
          </tr>
          @foreach ($articles as $article)
            <tr class="row">
              <td class="col-lg-6">
                {{ $article->description }}
              </td>
              <td class="col-lg-2">
                    {{ $article->title }}
              </td>
              <td class="col-lg-4">
                <a href="{{ URL('article/show/'.$article->id) }}" target="_blank">
                  {{ AppArticle::find($article->id)->title }}
                </a>
              </td>
              <td class="col-lg-1">
                <a href="{{ URL('article/'.$article->id.'/edit') }}" class="btn btn-success">编辑</a>
              </td>
              <td class="col-lg-1">
                <form action="{{ URL('article/'.$article->id) }}" method="POST" style="display: inline;">
                  <input name="_method" type="hidden" value="DELETE">
                  <input type="hidden" name="_token" value="{{ csrf_token() }}">
                  <button type="submit" class="btn btn-danger">删除</button>
                </form>
              </td>
            </tr>
          @endforeach
        </table>

 
        </div>
      </div>
    </div>
  </div>
</div>  
@endsection

show.blade.php

@extends('layouts.app')

@section('content')
<div class="container">  
  <div class="row">
    <div class="col-md-10 col-md-offset-1">
      <div class="panel panel-default">
        <div class="panel-heading">显示文章</div>

        <div class="panel-body">

          @if (count($errors) > 0)
            <div class="alert alert-danger">
              <strong>Whoops!</strong> There were some problems with your input.<br><br>
              <ul>
                @foreach ($errors->all() as $error)
                  <li>{{ $error }}</li>
                @endforeach
              </ul>
            </div>
          @endif

      
            <input name="_method" type="hidden" value="PUT">
            <input type="hidden" name="_token" value="{{ csrf_token() }}">
            文章标题：{{ $article->title }}
            <br>
             
            <br>
         
             <br>
     文章内容：{{ $article->description }}
            <br>
           
          

        </div>
      </div>
    </div>
  </div>
</div>  
@endsection

5 登录后台操作增删改查

源码文件在此，欢迎对照查阅

https://github.com/baker95935/laravelPractise5.4

玩转laravel5.4的入门动作（二）

做个文章的增删改查

第一步 把数据库的表结构建好，生成迁移

表建立完毕了，那么用系统自带的工具 orm模型 自动创建增删改

好了，基础的测试通了，咱们开始增删改了

第一步把数据库的表结构建好，生成迁移

表建立完毕了，那么用系统自带的工具 orm模型自动创建增删改