Laravel 子查询 whereIn答案

【问题标题】：Laravel subquery whereInLaravel 子查询 whereIn
【发布时间】：2017-08-15 17:55:04
【问题描述】：

我的查询有问题。我想做一个子查询，但它不返回结果。

这是我的代码：

        $distance_representations = Representation::select('id')
        ->where(DB::raw('round(6371 * acos(cos(radians(45.0)) * cos(radians(latitude)) * cos(radians(longitude) - radians(2.7)) + sin(radians(45.0)) * sin(radians(latitude)))::numeric, 1) < 50'))
        ->limit(10)
        ->get();

    $representations = Representation::select('id', 'city', DB::raw('round(6371 * acos(cos(radians(45.0)) * cos(radians(latitude)) * cos(radians(longitude) - radians(2.7)) + sin(radians(45.0)) * sin(radians(latitude)))::numeric, 1) < 50'))
        ->whereIn('id', $distance_representations)
        ->get();

    return view('search', array('representations' => $representations));

PostgreSQL 等价物：

select id, city, round((6371 * acos(cos(radians(45.0)) * cos(radians(latitude)) * cos(radians(longitude) - radians(2.7)) + sin(radians(45.0)) * sin(radians(latitude))))::numeric, 1) as distance
from representations 
where id in (
    select id
    from representations
    where round((6371 * acos(cos(radians(45.0)) * cos(radians(latitude)) * cos(radians(longitude) - radians(2.7)) + sin(radians(45.0)) * sin(radians(latitude))))::numeric, 1) < 50
    limit 10
)

谢谢

【问题讨论】：

您在主选择子句中有一个比较

标签： laravel subquery

【解决方案1】：

也许你可以试试这个

    $distance_representations = Representation::find('id')
    ->where(DB::raw('round(6371 * acos(cos(radians(45.0)) * cos(radians(latitude)) * cos(radians(longitude) - radians(2.7)) + sin(radians(45.0)) * sin(radians(latitude)))::numeric, 1) < 50'))
    ->limit(10)
    ->get();

    $representations = Representation::all()
    ->where(DB::raw('round(6371 * acos(cos(radians(45.0)) * cos(radians(latitude)) * cos(radians(longitude) - radians(2.7)) + sin(radians(45.0)) * sin(radians(latitude)))::numeric, 1) < 50'))
    ->whereIn('id', $distance_representations.id)
    ->get();

希望这会对你有所帮助。

【讨论】：

【解决方案2】：

我不明白您为什么需要子查询？除非我遗漏了什么，否则您应该能够使用单个查询来选择您的数据。

$representations = Representation::selectRaw('id, city, round(6371 * acos(cos(radians(45.0)) * cos(radians(latitude)) * cos(radians(longitude) - radians(2.7)) + sin(radians(45.0)) * sin(radians(latitude)))::numeric, 1) < 50 AS distance')
    ->where('distance', '<', 50)
    ->limit(10)
    ->get();

【讨论】：

谢谢，但不能在 where 子句中使用别名

【解决方案3】：

我找到了解决方案。我不能做得更好。谢谢。

此解决方案有效！

$representations_with_distance = Representation::select('id', 'city', DB::raw('round(6371 * acos(cos(radians(?)) * cos(radians(latitude)) * cos(radians(longitude) - radians(?)) + sin(radians(?)) * sin(radians(latitude)))::numeric, 1) as distance'));

$representation = DB::table(DB::raw("({$representations_with_distance->toSql()}) as rd"))
    ->where('distance', '<', '?')
    ->orderBy('distance')
    ->offset(0)
    ->limit(10)
    ->setBindings([$latitude, $longitude, $latitude,  $radius])
    ->get();

return view('search', array('representations' => $representation));

【讨论】：