LaravelWhereHas 在数据透视表（大数据）上速度很慢

Question

我想在 Laravel 中

Pivot

表中

Person

和

Topics

之间应用 where 条件。

我基本上有一张

Person

桌子和一张

Topics

桌子。

中间有一个数据透视表

person_topic

，其中包含两个外键（

person_id

和

topic_id

）以及

quantity

。

我放置了一个带有

::query()

的

whereHas

方法，该方法基于“主题 id”数组，在数据透视表中执行

whereIn

条件

person_topics

。

$from = request('from');
$to = request('to');
$topics = request('topics');
$unity = request('unity');
$limit = request('limit');

$eventsQuery = Event::query();

if (! is_null($topics) && $topics != "undefined") {
    $topics = array_map('intval', explode(',', $topics));
    $eventsQuery = $eventsQuery->whereHas('person.topics', function ($query) use ($topics) {
        return $query->whereIn('topic_id', $topics);
    });
}

$events = $eventsQuery->orderBy('date', 'DESC')
    ->whereIn('station_id', [$unity])
    ->whereBetween('date', [$from, $to])
    ->with('person')
    ->with('person.country')
    ->with('train')
    ->with('station')
    ->limit($limit)
    ->get();

return response()->json([
    'events' => $events,
    'message' => 'Success'
], 200);

该方法有效并返回了预期的结果，只是需要 2 分钟才能收到响应。

如何优化/修改我的代码以使我的请求执行得更好？

---

完整方法代码

$from = request('from');
$to = request('to');
$topics = request('topics');
$trains = request('trains');
$countries = request('countries');
$unity = request('unity');
$limit = request('limit');

if(is_null($trains) && $trains == "undefined" ){
    $limit = Event::count();
}

$eventsQuery = Event::query();

if(!is_null($countries) && $countries != "undefined" ){
    $countries = array_map('intval', explode(',', $countries));
    $eventsQuery = $eventsQuery->whereHas('person.country', function ($query) use ($countries) {
        return $query->whereIn('id', $countries);
    });
}
if(!is_null($trains) && $trains != "undefined" ){
    $trains = array_map('intval', explode(',', $trains));
    $eventsQuery = $eventsQuery->whereHas('train', function ($query) use ($trains) {
        return $query->whereIn('id', $trains);
    });
}
if(!is_null($topics) && $topics != "undefined" ){
    $topics = array_map('intval', explode(',', $topics));
    $eventsQuery = $eventsQuery->whereHas('person.topics', function ($query) use ($topics) {
        return $query->whereIn('topic_id', $topics);
    });
}

$events = $eventsQuery->orderBy('date','DESC')->whereIn('station_id', [$unity])->whereBetween('date',[$from, $to])->with('person')->with('person.country')->with('train')->with('station')->limit($limit)->get();

return response()->json([
    'events' => $events,
    'countries' => $countries,
    'message' => 'Success'
], 200);

Answer 1

你可以试试这个：
确保您创建了 2 个模型：

Person

和

Topic

创建

PersonTopic

模型并定义 2 个这样的关系

public function person()
{
    return $this->belongsTo('App\Models\Person', 'person_id', 'id');
}

public function topic()
{
    return $this->belongsTo('App\Models\Topic', 'topic_id', 'id');
}

然后就可以查询了

if(!is_null($topics) && $topics != "undefined" ){
    $topicIds = array_map('intval', explode(',', $topics));
    $rows = PersonTopic::with(['person', 'topic'])
            ->whereIn('topic_id', $topicIds)
            //can use whereHas if you want
            ->whereHas('topic', function ($query) use ($request) {
               $query->where('topics.column', $request->column);
            })
            ->get();
}

使用

foreach

循环获取详细信息

foreach ($rows as $row) {
   //get person detail
   $person = $row->person;
   //get topic detail
   $topic = $row->topic;
}

Answer 2

如果您将人员的外键放入事件表中，则可以使用连接到人员和主题表的数据透视表而不是 where has 来优化查询。

查询：

$eventsQuery = $eventsQuery->whereHas('person.topics', function ($query) use ($topics) {
    return $query->whereIn('topic_id', $topics);
});

可以替换为：

$eventsQuery->join(
  'person_topic',
  'person_topic.person_id',
  '=',
  'events.person_id'
)
    ->whereIn('person_topic.topic_id', $topics);