[英]Better way to get database info
好吧,所以我有一個座位系統,它會生成一個30x30的網格,並且對於每個網格,數據庫中都有一行,但是當我在頁面上生成該網格時,我目前每個元素發出5個SQL請求( 900個元素),我們都知道這不是最優的。
為了渲染它,我做了一些檢查,並回顯了這段代碼:
<li class="seat" @if(Seat::showTitle($id) == 1) data-toggle="tooltip" data-placement="left" title="" data-original-title="{{ Seat::title($id) }}" @endif><a class="{{ Seat::getCSSClass($id) }}">@if(Seat::showTitle($id) == 1) {{ Seat::seatID($id) }} @endif</a></li>
這是Seat模型如何工作的示例
<?php
class Seat extends Eloquent {
protected $fillable=array('user_id','timestamp','temp_user_id','temp_timestamp', 'class', 'seat_id', 'seat_name');
protected $table = 'seats';
public static $classes = array(
"blank" => array(
"css_class" => "seating_blank",
"can_reserve" => 0,
"show_title" => 0,
"title" => "Blank"
),
"available" => array(
"css_class" => "seating_green",
"can_reserve" => 1,
"show_title" => 1,
"title" => "Ledig"
),
"reserved" => array(
"css_class" => "seating_grey",
"can_reserve" => 0,
"show_title" => 1,
"title" => "Reserveret"
),
"taken" => array(
"css_class" => "seating_red",
"can_reserve" => 0,
"show_title" => 1,
"title" => "Betalt og Reserveret"
),
"temp_taken" => array(
"css_class" => "seating_orange",
"can_reserve" => 0,
"show_title" => 1,
"title" => "Reservation igangsat"
)
);
public static function getCSSClass($seat)
{
$theSeat = Self::where('id', '=', $seat)->first();
if($theSeat) {
$class = $theSeat->class;
return Self::$classes[$class]['css_class'];
} else {
return NULL;
}
}
public static function canReserve($seat)
{
$theSeat = Self::where('id', '=', $seat)->first();
if($theSeat) {
$class = $theSeat->class;
return Self::$classes[$class]['can_reserve'];
} else {
return NULL;
}
}
public static function showTitle($seat)
{
$theSeat = Self::where('id', '=', $seat)->first();
if($theSeat) {
$class = $theSeat->class;
return Self::$classes[$class]['show_title'];
} else {
return NULL;
}
}
public static function title($seat)
{
$theSeat = Self::where('id', '=', $seat)->first();
if($theSeat) {
$class = $theSeat->class;
return Self::$classes[$class]['title'];
} else {
return NULL;
}
}
public static function seatID($seat)
{
$theSeat = Self::where('id', '=', $seat)->first();
if($theSeat) {
return $theSeat->seat_id;
} else {
return NULL;
}
}
public static function seatName($seat)
{
$theSeat = Self::where('id', '=', $seat)->first();
if($theSeat) {
return $theSeat->seat_name;
} else {
return NULL;
}
}
public static function classTitle($class)
{
return Self::$classes[$class]["title"];
}
public static function userID($seat)
{
$theSeat = Self::where('id', '=', $seat)->first();
if($theSeat) {
return $theSeat->user_id;
} else {
return NULL;
}
}
public static function getClass($seat)
{
$theSeat = Self::where('id', '=', $seat)->first();
if($theSeat) {
return $theSeat->class;
} else {
return NULL;
}
}
}
每個請求有5個這樣的功能,這就是很多方法。 因此,我需要一些好的方法來最小化該系統的SQL負載。
您的模型應如下所示:
class Seat extends Eloquent {
protected $fillable = array('user_id','timestamp','temp_user_id','temp_timestamp', 'class', 'seat_id', 'seat_name');
protected $table = 'seats';
private $classes = array(
"blank" => array(
"css_class" => "seating_blank",
"can_reserve" => 0,
"show_title" => 0,
"title" => "Blank"
),
"available" => array(
"css_class" => "seating_green",
"can_reserve" => 1,
"show_title" => 1,
"title" => "Ledig"
),
"reserved" => array(
"css_class" => "seating_grey",
"can_reserve" => 0,
"show_title" => 1,
"title" => "Reserveret"
),
"taken" => array(
"css_class" => "seating_red",
"can_reserve" => 0,
"show_title" => 1,
"title" => "Betalt og Reserveret"
),
"temp_taken" => array(
"css_class" => "seating_orange",
"can_reserve" => 0,
"show_title" => 1,
"title" => "Reservation igangsat"
)
);
public static function getSeats()
{
$seats = $this->all(); //get all seats you may want to add some where clause
return $this->prepareData($seats);
}
private function prepareData($seats)
{
foreach ($seats as $key => $seat)
{
$seats[$key]->css_class = $this->classes[$seat->class]['css_class'];
$seats[$key]->can_reserve = $this->classes[$seat->class]['can_reserve'];
$seats[$key]->show_title = $this->classes[$seat->class]['show_title'];
$seats[$key]->title = $this->classes[$seat->class]['title'];
}
return $seats;
}
}
鑒於您想要執行以下操作:
@foreach ($seats as $seat)
<li class="seat"
@if($seat->show_title) data-toggle="tooltip" data-placement="left" title="" data-original-title="{{ $seat->title }}" @endif>
<a class="{{ $seat->css_class }}">@if($seat->show_title) {{ $seat->id }} @endif</a>
</li>
@endforeach
控制器示例是:
$seats = Seats::getSeats();
return view('whatever')->withSeats($seats);
問題的部分答案可能是讓showTitle
函數之類的函數使用Laravel的whereIn
函數,以便使SQL查詢可對ID數組進行操作,而不是按1乘1。這可以大大減少SQL查詢的數量。
這是我之前基本上使用的示例。
因此,在此示例中,您將使用一些循環來首先創建$arrayOfGroups
,然后將其用作wherein
的參數
$result = DB::table('users')
->whereIn('group',$arrayOfGroups)
->get();
我認為您可以根據自己的情況做類似的事情。
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