缓慢的简单 eloquent 查询

Question

我是 laravel eloquent 的新手，我想知道加载时间是否通常只有五个条目

即使是一个简单的 select 所有查询都有大约 720 毫秒，特别是在第一张照片（模态）的编辑按钮上，数据在一秒钟后出现，这是显而易见的，我正在使用 Livewire 我不知道是否影响太大

影响额外加载时间的主要问题是如何在仅计算服务总和的子 table 上访问（聚合），我在 html 上写了一个简单的计数 {{ $customer->services->count()}} table 如您所见，在每一行上运行都是错误的，因为会增加额外的加载时间。
在 php 我做了类似的东西：

 $sql = "SELECT name,vat,id";
        $sql .= " ,(select sum(taskcharges) from charges where charges.customers_id=customers.id) as taskcharges_sum";
        $sql .= " ,(select sum(payment) from charges where charges.customers_id=customers.id) as payment_sum";
        $sql .= " ,(select sum(taskcharges-payment) from charges where charges.customers_id=customers.id) as balance_sum";
        $sql .= " ,(select name WHERE customers.id=$id) ";

        $sql .= " FROM customers ";

我想从客户那里获得对特定子（服务）列的访问权限，以实现像 max、sum、count 这样的函数 tables 绑定在模型上，所以我想避免额外的连接查询代码另外，正如您在排序时看到的那样，“服务”不是客户 table 的列，因此他们无法识别客户 table 的列服务，如果我有类似“select count(services)作为 servicecount 那么我将能够将排序识别为 table 客户

的新列

上面你可以看到我的代码：

customers/show.blade.php:

<div class="container">

    <p>Sort column:{{$selectedItems}}</p>
    <p>Selected Direction:{{$action}}</p>
  
  
    <!-- Button trigger modal -->
    <button wire:click.prevent="addNew" type="button" class="btn btn-primary">
        Add New User
    </button> 

    
 <!-- button triger Modal -->
 <div class="modal fade" id="form" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
    <div class="modal-dialog" role="document">
    
        <div class="modal-content">
        <div class="modal-header">
          <h5 class="modal-title" id="exampleModalLabel">Insert</h5>
          <button type="button" wire:click.prevent="close"class="close" data-dismiss="modal" aria-label="Close">
            <span aria-hidden="true">&times;</span>
          </button>
        </div>
        <div class="modal-body">
            @livewire('customers.form')
        </div>
      
      </div>
    
    </div>

  </div>



  <div class="modal fade" id="delete" tabindex="-1" role="dialog" aria-labelledby="delete" aria-hidden="true" wire:ignore>
    <div class="modal-dialog" role="document">
    
        <div class="modal-content">
        <div class="modal-header">
          <h5 class="modal-title" id="delete">Delete</h5>
          <button type="button" wire:click.prevent="close" class="close" data-dismiss="modal" aria-label="Close">
            <span aria-hidden="true">&times;</span>
          </button>
        </div>
        <div class="modal-body">
         <h3>Do you wish to continue?</h3>
        </div>
          <div class="modal-footer">
            <button type="button" wire:click="close" class="btn btn-secondary" data-dismiss="modal">Cancel</button>
            <button wire:click="delete" class="btn btn-primary">Delete</button>
        
        </div>
      </div>
    
    </div>

  </div>

<h1 class="text-center">Customers {{count($customers)}}</h1> 


    <div>
      <div class="w-full flex pb-10">
          <div class="w-3/3 mx-1">
              <input wire:model.debounce.300ms="search" type="text" class="form-control" placeholder="Search users...">
          </div>
         
         
          
          <div class="row mb-4">
            <div class="col form-inline">
              Per Page:&nbsp;
              <select wire:model="perPage" class="form-control">
                  <option>5</option>
                  <option>10</option>
                 
              </select>
          
          </div>

        </div>
      </div>
      <table class="table-auto w-full mb-6">
          <thead>
              <tr>
                  <th wire:click="sortBy('id')" style="cursor: pointer;" class="px-4 py-2">ID
                    @include('layouts.partials.sort_icons',['field'=>'id'])
                  </th>
                  
                  <th wire:click="sortBy('name')" style="cursor: pointer;" class="px-4 py-2">Name
                    @include('layouts.partials.sort_icons',['field'=>'id'])</th>
                  <th wire:click="sortBy('plate')" style="cursor: pointer;" class="px-4 py-2">Plate
                    @include('layouts.partials.sort_icons',['field'=>'id'])</th>
                    <th wire:click="sortBy('services')" style="cursor: pointer;" class="px-4 py-2">Services
                      @include('layouts.partials.sort_icons',['field'=>'services'])</th>
                  <th class="px-2 py-2">Action</th>
                  
              </tr>
          </thead>
          <tbody>
              @foreach($customers as $customer)
                  <tr>
                      <td class="border px-4 py-2">{{ $customer->id }}</td>
                      <td class="border px-4 py-2">{{ $customer->name }}</td>
                      <td class="border px-4 py-2">{{ $customer->plate }}</td>
                      <td class="border px-4 py-2">{{ $customer->services->count()}}</td>
                      <td class="border px-2 py-2">
                        <button wire:click="selectItem({{$customer->id}},'update')" class="btn btn-info"><i class="fa fa-edit"></I></button></a>
                        <button wire:click="selectItem({{$customer->id}},'delete')" class="btn btn-danger"><i class="fa fa-trash"></I></button></a>
                    </td>
                  </tr>
              @endforeach
          </tbody>
      </table>
      
     <div class="paginate">{{$customers->links()}}</div>
  </div>

</div>

customers/Show.php :


<?php

namespace App\Http\Livewire\Customers;
use App\Models\Customer;
use Livewire\Component;


use App\Page;
use Illuminate\Support\Str;
use App\Http\Livewire\Column;
use Livewire\WithPagination;

class Show extends Component
{


  

    public $sortBy= 'name';
    public $sortDirection = 'asc';
    public $headers;
    public $perPage ='5';
    public $search;
    public $action;
    public $selectedItems;
  

    public function sortBy($field){
        if ($this->sortDirection =='asc'){
            $this ->sortDirection ='desc';

        }
        else{
            $this->sortDirection ='asc';
        }
        return $this ->sortBy = $field;
    }


    public function selectItem($itemId,$action){
        
        $this->selectedItems=$itemId;
        $this->action=$action;
       
        if ($action=='delete'){
         
            $this->dispatchBrowserEvent('show-deletemodal');

        } else{
            $this->emit('getcustomerID', $this->selectedItems);
            $this->dispatchBrowserEvent('show-modal');
        }
        
        
    }

    public function delete(){
        
        Customer::destroy($this->selectedItems);
        $this->dispatchBrowserEvent('hide-modal');
       
   }

    public function addNew()
    {
        
        $this->dispatchBrowserEvent('show-modal');
    }
    public function close()
    {
        $this->dispatchBrowserEvent('hide-modal');
    }


    
    protected $listeners = [
        'deleteconfirmed'=>'$selectedItems',
        'refreshParent'=>'$refresh'
    ];


      
   
    public function render()

    { 
       
        $customers = Customer::query()
        ->search($this->search)
        ->orderBy($this->sortBy,$this->sortDirection)
        ->paginate($this->perPage);
 
        return view('livewire.customers.show',['customers'=>$customers
        ])
        ->extends('admin.dashboard')
        ->section('content');
        
 
    }


}

customers/form.php :

<?php

namespace App\Http\Livewire\Customers;
use App\Models\Customer;
use Livewire\Component;

class Form extends Component
{


    
    public $name ='';
    public $plate = '';
    public $customerId ;

    protected $listeners = [
        'getcustomerID'
    ];
  
    
    protected function rules() {
    
        return [
        'name' => 'required',
        'plate' => ['required', 'regex:/[A-Z]{3}\d{4}$/','unique:customers,plate,' . $this->customerId],
        ];
        
    }
    
    public function updated($propertyName)
    {
        $this->validateOnly($propertyName);
    }
    
    public function getcustomerID($customerId){

        $this->customerId=$customerId;

        $customer=  customer::find ($this->customerId);
      
        $this->name=$customer->name;
        $this->plate= $customer->plate;
    }
    
    public function save()
    {
        $this->validate();
       
        $data = [
            'name' => $this->name,
            'plate' => $this->plate,
        ];

        if ($this->customerId){
            
           customer::find ($this->customerId)->update($data);
           session()->flash('message', 'User successfully updated.');

        } else{

            customer::create($data);
        }


        $this->emit('refreshParent');
        $this->dispatchBrowserEvent('hide-modal');

        $this ->ClearVars();
    }
    
    
    public function ClearVars(){
        $this->name=null;
        $this->plate=null;
    
    }
     
   
    public function render()
    {
        return view('livewire.customers.form');
    }
}

Models/Customer.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class Customer extends Model
{
   use HasFactory;
   protected $fillable = [
      'name',
      'plate'
   ];

   public function services()
   {

      return $this->hasMany(Service::class);
   }
   public function parts()
   {

      return $this->hasMany(Part::class, 'customer_id');
   }


public function scopeSearch($query , $val){
   return $query
   ->where('name','like','%'.$val.'%')
   ->Orwhere('plate','like','%'.$val.'%');
   

}

   public function user()
   {

      return $this->belongsTo(User::class);
   }
}

Models/Services.php

<?php

namespace App\Models;


use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class Service extends Model
{

    protected $fillable = [
        'service_type',
        'km',
    ];
    public function customer()
    {
        return $this->belongsTo(Customer::class);
    }

    public function parts()
    {

        return $this->hasMany(part::class);
    }
}

Answer 1

原来如此简单.. 只需在查询上方添加 ->withCount('services') 还有那个奇怪的延迟

更新：响应慢的问题是试图从远程 sql 服务器检索数据，我切换到本地并且我只有不到 100 毫秒！

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