March 2021
Beginner to intermediate
600 pages
12h 19m
Korean
Content preview from 몽고DB 완벽 가이드(3판): 실전 예제로 배우는 NoSQL 데이터베이스 기초부터 활용까지
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102
1
부
몽고DB 시작
{
"_id" : ObjectId("4b2d75476cc613d5ee930164"),
"title" : "A blog post",
"content" : "...",
"comments" : [
{
"name" : "joe",
"email" : "joe@example.com",
"content" : "nice post."
},
{
"name" : "bob",
"email" : "bob@example.com",
"content" : "good post."
}
]
}
"$
slice
"
연산자를 추가해 마지막 댓글을 얻는다.
> db.blog.posts.findOne(criteria, {"comments" : {"$slice" : -1}})
{
"_id" : ObjectId("4b2d75476cc613d5ee930164"),
"title" : "A blog post",
"content" : "...",
"comments" : [
{
"name" : "bob",
"email" : "bob@example.com",
"content" : "good post."
}
]
}
키 명시자에 직접 지정하지 않아도
"
title
"
과
"
content
"
키 둘 다 반환한다.
일치하는 배열 요소의 반환
배열 요소의 인덱스를 알고 있다면
"$
slice
"
연산자가 유용하게 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.