使用 Laravel 对计算列执行查询

Question

我想使用 Laravel 的 Eloquent 模型在 PHP 中执行以下 SQL 语句：

SELECT *, (3959 * acos(cos(radians(37)) * cos(radians(lat)) * cos(radians(lng) - radians(-122)) + sin(radians(37)) * sin(radians(lat )))) AS distance
FROM example_retailers
HAVING distance < 1000
ORDER BY distance
OFFSET 4
LIMIT 3;

我正在努力将其转换为 Laravel 的 Eloquent 模型（主要是计算列）。

这是我目前所拥有的：

ExampleRetailer::
    // TODO: add calculated row
    where('distance', '<', 100)
    ->orderBy('distance')
    ->skip(4)
    ->limit(3)
    ->get();

Answer 1

如果只是使用 SQL 创建一个新行：

SELECT *, CASE WHEN (3959 * acos(cos(radians(37))
                          * cos(radians(lat))
                          * cos(radians(lng) - radians(-122))
                          + sin(radians(37))
                          * sin(radians(lat )))) < 100 THEN END AS NewRow
FROM example_retailers

Answer 2

您可以使用原始查询 (source)

DB::table('example_retailers')
->select(DB::raw('*, (3959 * acos(cos(radians(37)) * cos(radians(lat)) * cos(radians(lng) - radians(-122)) + sin(radians(37)) * sin(radians(lat )))) AS distance'))
->having('distance', '<', 100)
->orderBy('distance')
->skip(4)
->limit(3)
->get();