laravel框架实现数据的删除和修改

//模型层的调用

<?php
namespace App;
use Illuminate\Support\Facades\DB;
use Illuminate\Database\Eloquent\Model;
class teach extends Model
{
//数据表
   public $table='teach';
//定义主键
   public $primarkey='id';
//时间戳
   public $timestamps=true;
//白名单
    protected $fillable=['updated_at','created_at','name','sex','tel','id'];
}

//展示页面

<a href="{{ route('teach.edit', $teacher->id ) }}">Edit</a>//跳转修改方法
<form action="{{ route('teach.destroy', $teacher->id) }}" method="post" style="display: inline-block;">
      {{ csrf_field() }}
       {{ method_field('DELETE') }}
<button type="submit" style="color: #F08080;background-color: transparent;border: none;">Delete</button>//跳转删除方法
</form>

<?php
namespace App\Http\Controllers;
use App\School;
use App\teach;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
class TeachController extends Controller
{

//引入修改页面
public function edit($id)
{
      $teacher = Teach::findOrFail($id);
      return view('teachers.edit', compact('teacher'));

}

edit.blade.php:

@extends('layouts.app')

@section('content')
<form action="{{ route('teach.update', $teacher->id) }}" method="post">
     {{ csrf_field() }}
     {{ method_field('PATCH') }}

<!-- //这是跨站方法伪造，HTML 表单没有支持 PUT、PATCH 或 DELETE 动作。所以在从 HTML 表单中调用被定义的 PUT、PATCH 或 DELETE 路由时，你将需要在表单中增加隐藏的 _method 字段来伪造该方法
-->
   <label>姓名:</label>
   <input type="text" name="name" style="width:100%;" value="{{ old('name') }}">
   <label>性别:</label>
   <input name="sex" rows="10" style="width:100%;" value="{{ old('sex') }}">
   <label>电话:</label>
     <input name="tel" rows="10" style="width:100%;" value="{{ old('tel') }}">
     <button type="submit">OK</button>
</form>
@endsection

//修改
public function update(Request $request, $id){
    $this->validate($request, [
            'name' => 'required|max:50',
     ]);

$teacher = Teach::findOrFail($id);
     $teacher->update([
         'name' => $request->name,
         'sex' => $request->sex,
         'tel' => $request->tel,
   ]);
}

//删除

public function destroy($id)
{
$teacher = Teach::findOrFail($id);
$teacher->delete();
return back();
}