April 2020
Beginner to intermediate
540 pages
14h 14m
Russian
Content preview from MongoDB: полное руководство
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182 Глава 6. Специальные типы индексов и коллекций
> db.hyrule.nd({
loc: {
$geoWithin: {
$centerSphere: [[88, 30], 10/3963.2]
}
}
})
Для запроса ближайших точек используйте оператор "$near". Запросы
на близость возвращают документы с парами координат, ближайшими к
определенной точке, и сортируют результаты по расстоянию. Так можно
найти все документы в коллекции hyrule в порядке расстояния от точки
(20, 21):
> db.hyrule.nd({"tile" : {"$near" : [20, 21]}})
Если ограничение не указано, по умолчанию применяется ограничение
в 100 документов. Если вам не нужно так много результатов, нужно уста-
новить ограничение для экономии ресурсов ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.