Php 删除表中的记录_Php_Laravel 5.2

Php 删除表中的记录

php

Php 删除表中的记录,php,laravel-5.2,Php,Laravel 5.2,使用Laravel 5.2.45 //Call to a member function delete() on null //I don't know what that is supposed to mean $id = Contact::all(); Contact::find($id) -> delete(); 一般来说，我对Laravel和PHP还比较陌生，所以我正在做一个电话簿项目，在那里我存储人们的联系信息我的数据库中有一个名为“联系人”的表，名为“电话簿” 我有一个表单

使用Laravel 5.2.45

//Call to a member function delete() on null
//I don't know what that is supposed to mean
$id = Contact::all();
Contact::find($id) -> delete();

一般来说，我对Laravel和PHP还比较陌生，所以我正在做一个电话簿项目，在那里我存储人们的联系信息

我的数据库中有一个名为“联系人”的表，名为“电话簿”

我有一个表单视图，可以在此表中记录新条目

这是一种观点：

phonebook.blade.php

....... css and stuff here .......
<body>

            <h1> Contact Form </h1><br/>

                        {{-- FORM --}}

            <form method = "POST" action = "contacts">

                {{ csrf_field() }}

                <div class = "form-group
                    @if($errors->has('name')) 
                        has-error
                    @endif"> 
                    <label for = "name"> Name </label><br/>
                    <input type = "text" id = "name" class = "form-control" name = "name" placeholder = "Name your Name" value = "{!! old('name') !!}">
                    @if($errors->has('name')) 
                        <p class = "help-block">{{ $errors->first('name') }}</p> 
                    @endif
                </div><br/>

                <div class = "form-group 
                    @if($errors->has('lastname')) 
                        has-error
                    @endif"> 
                    <label for = "lastname"> Lastname </label><br/>
                    <input type = "text" id = "lastname" class = "form-control" name = "lastname" placeholder = "Name your Lastname" value = "{!! old('lastname') !!}">
                    @if($errors->has('lastname')) 
                        <p class = "help-block">{{ $errors->first('lastname') }}</p> 
                    @endif                        
                </div><br/>

                <div class = "form-group 
                    @if($errors->has('email')) 
                        has-error
                    @endif">
                    <label for = "email"> E-mail </label><br/>
                    <input type = "text" id = "email" class = "form-control" name = "email" placeholder = "somesomething@email.com" >
                    @if($errors->has('email')) 
                        <p class = "help-block">{{ $errors->first('email') }}</p> 
                    @endif
                </div><br/>

                <div class = "form-group 
                    @if($errors->has('phone'))
                        has-error
                    @endif">
                    <label for = "phone"> Phone Number </label><br/>
                    <input type = "text" id = "phone" class = "form-control" name = "phone" placeholder = "I'll call you">
                    @if($errors->has('phone')) 
                        <p class="help-block">{{ $errors->first('phone') }}</p> 
                    @endif
                </div><br/>

                <div class = "form-group"> 
                    <label for = "address"> Address </label><br/>
                    <input type = "text" id = "address" class = "form-control" name = "address" placeholder = "I'll even visit you" value = "{!! old('address') !!}">                        
                </div><br/>

                <div>
                    <button type = "submit" class = "submit"> Submit Information </button>
                    <a href="contacts"><button type = "button"> View Contacts </button></a>
                </div>
            </form>      
        </body>
    </html>

....... css and stuff here .......
<body>

        <h1> Contacts </h1>

        <br/>

        <div>
            <a href = "phonebook"><button class = "ret" type = "button"> Add New Entry </button></a>
        </div>

        <br/><br/>

        <table class = "contacts">

            <thead>
                <tr>
                    <th> ID       </th>
                    <th> Name     </th>
                    <th> Lastname </th>
                    <th> E-Mail   </th>
                    <th> Phone    </th>
                    <th> Address  </th>
                    <th> Edit     </th>
                    <th> Delete   </th>
                </tr>
            </thead>

            <tbody>
                @foreach($contact as $contact)                                                      
                    <tr class = "tableBody">
                        <td class = "id">       {{ $contact->id }}                                          </td>
                        <td class = "name">     {{ $contact->name }}                                        </td>
                        <td class = "lastname"> {{ $contact->lastname }}                                    </td>
                        <td class = "email">    {{ $contact->email }}                                       </td>
                        <td class = "phone">    {{ $contact->phone }}                                       </td>
                        <td class = "address">  {{ $contact->address }}                                     </td>
                        <td class = "edit">     <a href = "edit"> Edit </a>                                 </td>
                        <td class = "delete">   <a href = "delete"> Delete </a>                             </td>
                    </tr>                       
                @endforeach
            </tbody>
        </table>

        <br/>

        <div>
            <a href = "phonebook"><button class = "ret" type = "button"> Add New Entry </button></a>
        </div>
    </body>
</html>

<?php

use Illuminate\Support\Facades\Input;
use App\Contact;
use App\Http\Controllers;


// default welcome view from Laravel
Route::get('/', function ()
{
    return view('welcome');
});

// getting the routes from the controller
Route::resource('contacts', 'ContactsController');

// getting the form from the controller, wich is in a .blade.php view
Route::get('phonebook', 'ContactsController@index');

// showing the table in a .blade.php view
Route::get('contacts', 'ContactsController@tab');

// the route to post the contact in the table, using the form in the phonebook.blade.php
Route::post('contacts', 'ContactsController@create');

// routing to the destroy function in my controller
Route::get('delete', [
    'as' => 'delete', 'uses' => 'ContactsController@destroy'
]);

// getting the edit.blade.php, not working
// permeate the inputs of name, lastname, email, phone and address
// with the same inputs we have in the row of our table
Route::get('edit', function()
{
    return view('edit');
});

也许错误在我的路径中，这就是为什么我也将其粘贴到这里

总的来说，这是我的控制器

ContactsController.php带注释

   <?php

    namespace App\Http\Controllers;

    use App\Contact;
    use DB;
    use Illuminate\Http\Request;

    use App\Http\Requests;

    use Illuminate\Support\Facades\Input;
    use Validator;


    class ContactsController extends Controller
    {
       // showing the form in the phonebook.blade.php
        // the form is structured using html and stuff
        public function index()
        {
            return view('phonebook');
        }

        // showing the table where I save my contacts
        // simple view stuff
        public function tab()
        {
            return view('contacts');
        }

        // the parameters to save my contact, with errors and stuff
        //working since day one
        public function create()
        {
            $rules = array(
                'name'      => 'alpha|min:3|max:15|required',
                'lastname'  => 'alpha|min:3|max:15',
                'email'     => 'required|unique:contacts,email|email',
                'phone'     => 'required|unique:contacts,phone|alpha_num|between:3,25',
                'address'   => 'max:255',
            );

            $messages = array(
                'alpha'     => 'The :attribute must contain only letters.',
                'max'       => 'The :attribute must have a maximum of 15 letters.',
                'min'       => 'The :attribute must have at least 3 characters.',
                'required'  => 'The :attribute is really important. We are storing your contact info after all...',
                'email'     => 'The :attribute must be a valid e-mail format address.',
                'numeric'   => 'The :attribute must contain only numbers.',
                'between'   => 'The :attribute content must have a lenght between 3 and 25 characters.',
            );

            $validator = Validator::make(Input::all(), $rules, $messages);

            if ($validator->fails())
            {
                $messages = $validator -> messages();

                return redirect('phonebook')
                    ->withInput()
                    ->withErrors($validator);
            }
            else 
            {
                $contact             = new Contact;
                $contact-> name      = Input::get('name');
                $contact-> lastname  = Input::get('lastname');
                $contact-> email     = Input::get('email');
                $contact-> phone     = Input::get('phone');
                $contact-> address   = Input::get('address');

                $contact->save();

                // $contact =  App\Contact::all();

                return view('contacts', compact('contact'));
            };
        }

与我要在findOrFail（）中传递的参数无关，无论是$id、$name还是uniques$phone或$email，错误都与代码注释中提到的相同

销毁功能2

//FatalErrorException in ContactsController.php line 93:
//Class 'App\Http\Controllers\Contacts' not found
Contacts::where('id','=',$id);
$id->delete();

在这一次和下一次，我甚至不知道如何摆脱这个错误

销毁功能3

//Same error as above
//Class not found
$contact = Contacts::where('id', '=', $id);
$contact->delete();

在下一篇文章中，我加入了一个

if

语句来检查事情是否进展顺利

销毁功能4

//Class contacts not found
$id = contacts::where('id', $id)->first();
if ($id != null) {
    $id->delete();
return view('delete'); 
}else{
return view('delete')->with(['message'=> 'Contact not found']);
};

下一个返回一个我不理解的错误

销毁功能5

//Call to a member function delete() on null
//I don't know what that is supposed to mean
$id = Contact::all();
Contact::find($id) -> delete();

现在，下一段代码是感觉最好的代码，因为它返回delete视图，但不删除我的表中的条目，甚至不使用forceDelete（）

销毁功能6

//loading the view page, but not deleting the entry
// not even using forceDelete()
Contact::where('id', '=', '$id') 
    -> where('name', '=', '$name')
    -> delete();

最后，我想，只是为了好玩，我发布了下一行代码，当我单击表中的删除链接时，它会使我的服务器停机

//This line destroys my local server
//I have to up it again, using art serve command line
// $this -> destroy(Contact::get());

因此，我在使销毁函数工作时遇到了困难

这就是我需要的

我需要在我的函数中做一些修改，如果其中一个函数中有一个修改，我会非常高兴。再次重申，这些函数都不起作用，它们中的每一个都返回某种错误，正如大家在代码本身提供的注释中看到的那样

正如我之前所说的，销毁函数6是我认为将要运行的函数，因为它返回我想要的视图，而不是删除表中的条目

另外，我发布了所有这些代码，因为可能是从后面传来的错误

可以随意要求其他文件，如模型、迁移等

编辑

这是我的联系方式：

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Contact extends Model
{
    // not using an id field
    // could this be the error?
    // isn't laravel making an automatic id field?
    // dunno
    public $fillable = array('name', 'lastname', 'email', 'phone', 'address');

    //added because of error at migration
    public $timestamps = false; 
}

但是，这段代码删除了我表格中的第一个条目，与我单击delete按钮的位置无关，这很有意义，那是一个first（）

既然这是一种工作方式，我应该用什么语句让它删除我想要的条目？

//Same error as above
//Class not found
$contact = Contacts::where('id', '=', $id);
$contact->delete();

结束编辑

抱歉，问题中的代码太多。

提前谢谢大家。

***编辑**

您需要更新“删除”按钮所在的刀片模板，以将联系人id作为url的一部分传递

<tbody>
                @foreach($contact as $contact)                                                      
                    <tr class = "tableBody">
                        <td class = "id">       {{ $contact->id }}                                          </td>
                        <td class = "name">     {{ $contact->name }}                                        </td>
                        <td class = "lastname"> {{ $contact->lastname }}                                    </td>
                        <td class = "email">    {{ $contact->email }}                                       </td>
                        <td class = "phone">    {{ $contact->phone }}                                       </td>
                        <td class = "address">  {{ $contact->address }}                                     </td>
                        <td class = "edit">     <a href = "edit"> Edit </a>                                 </td>
                        <td class = "delete">   <a href = "delete/{{ $contact->id }}"> Delete </a>                             </td>
                    </tr>                       
                @endforeach
            </tbody>

然后让控制器销毁方法接受id

public function destroy($id)
{
   $contact = Contact::findOrFail($id);
   $contact->delete();
}

原始版本

使用$contact->id进行此操作。findOrFail需要传递id

销毁功能1

//error: undefined variable in the findOrFail()
$contact = Contact::findOrFail($contact);
$contact->delete();

//error: undefined variable in the findOrFail()
$contact = Contact::findOrFail($contact->id);
$contact->delete();

销毁功能2

//FatalErrorException in ContactsController.php line 93:
//Class 'App\Http\Controllers\Contacts' not found
Contacts::where('id','=',$id);
$id->delete();

似乎您没有联系人类的导入语句。检查Contacts类的名称空间，并将其添加到控制器类的顶部，如下所示：

use App\Contact;

$contact = Contact::where('id','=',$id)->get();
$contact->delete();

或

销毁功能3

同上。添加导入/使用语句

//Same error as above
//Class not found
$contact = Contact::where('id', '=', $id)->get();
$contact->delete();

我尝试使用“use”语句导入该类，但显示了相同的错误。另外，我的模型位于根应用程序目录中。是否添加了

use-App\Contact？另外，我在你的问题中看到两个不同的名字。类名是联系人
还是联系人
？使用正确的导入。是的，我添加了Use-App\Contact。这次我用对了名字。我在测试这些代码，所以在放弃之前我改变了很多东西。它仍然不起作用吗？你能发布你的更新代码和你可能会遇到的任何错误吗？很抱歉迟到了。错误仍然是一样的，它无法识别Contact类，即使我在文件中声明了它。请输入一些错误。你好，Pandhi。错误与代码块以及其他类型的注释有关。