MongoDB에 생성
blog 데이터베이스 생성, users, posts collection 생성
> use blog
blog> db.users.insertMany([{name:"First",age:20,email:"first@a.com"}, {name:"Second",age:21,email:"second@a.com"}])
{
acknowledged: true,
insertedIds: {
'0': ObjectId('65e803f125d99817df294c64'),
'1': ObjectId('65e803f125d99817df294c65')
}
}
blog> db.users.find()
[
{
_id: ObjectId('65e803f125d99817df294c64'),
name: 'First',
age: 20,
email: 'first@a.com'
},
{
_id: ObjectId('65e803f125d99817df294c65'),
name: 'Second',
age: 21,
email: 'second@a.com'
}
]
blog> db.posts.insertOne({title:"My first Post", text:"Thist is my first post", tags:["new", "tech"], creator:ObjectId('65e803f125d99817df294c65'), comments:[{text:"I like this post",author:ObjectId('65e803f125d99817df294c64')}]})
{
acknowledged: true,
insertedId: ObjectId('65e804b225d99817df294c66')
}
blog> db.posts.find()
[
{
_id: ObjectId('65e804b225d99817df294c66'),
title: 'My first Post',
text: 'Thist is my first post',
tags: [ 'new', 'tech' ],
creator: ObjectId('65e803f125d99817df294c65'),
comments: [
{
text: 'I like this post',
author: ObjectId('65e803f125d99817df294c64')
}
Schema Validation
db.createCollection('posts',
{
validator: {
$jsonSchema: {
bsonType: 'object',
required: ['title', 'text', 'creator', 'comments'],
properties: {
titile: {
bsonType: "string",
description: "must be a string and required"
},
text: {
bsonType: "string",
description: "must be a string and required"
},
creator: {
bsonType: "objectId",
description: "must be a objectid and required"
},
comment: {
bsonType: "array",
description: "must be a array and required",
items: {
bsonType: "object",
required: ["text", "author"],
properties: {
text: {
bsonType: "string",
description: "must be a array and required"
},
author: {
bsonType: "objectId",
description: "must be a array and required"
}
}
}
}
}
}
}
});
데이터 모델리 시 고려해야 할 사항
- 데이터 페치 형식
- 얼마나 자주 데이터가 페치/변경되는지
- 데이터 저장 건수
- 데이터 연관성
- 데이터 중복 허용
- 데이터와 저장공간 한계
Useful Resources & Links
Helpful Articles/ Docs:
- The MongoDB Limits: https://docs.mongodb.com/manual/reference/limits/
- The MongoDB Data Types: https://docs.mongodb.com/manual/reference/bson-types/
- More on Schema Validation: https://docs.mongodb.com/manual/core/schema-validation/