April 2020
Beginner to intermediate
540 pages
14h 14m
Russian
Content preview from MongoDB: полное руководство
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Запросы для определенных типов 89
}
]
}
И "title", и "content" по-прежнему возвращаются, хотя они не были явно
включены в спецификатор ключа.
Возврат совпадающего элемента массива
Оператор "$slice" полезен, когда вы знаете индекс элемента, но иногда
вам нужно, чтобы любой элемент массива совпадал с вашими критериями.
Совпадающий элемент можно вернуть с помощью оператора $. Учитывая
предыдущий пример с блогом, можно получить комментарий Боба с по-
мощью этого запроса:
> db.blog.posts.nd({"comments.name" : "bob"}, {"comments.$" : 1})
{
"_id" : ObjectId("4b2d75476cc613d5ee930164"),
"comments" : [
{
"name" : "bob",
"email" : "bob@example.com",
"content" ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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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.