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Added mongoDB cheatSheet

This commit is contained in:
El. Abdellah 2021-11-12 11:28:07 +01:00
parent d7fb65e5c5
commit 734a77342f

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# *****************************************************************************
# BASICS
# *****************************************************************************
# Connect MongoDB Shell
mongo # connects to mongodb://127.0.0.1:27017 by default
mongo --host <host> --port <port> -u <user> -p <pwd> # omit the password if you want a prompt
# Show All Databases
show dbs
# Show Current Database
db
# Create Or Switch Database
use <database_name>
# Drop Database
db.dropDatabase()
# Create Collection
db.createCollection('posts')
# Show Collections
show collections
# *****************************************************************************
# CRUD
# *****************************************************************************
# Insert Row
db.posts.insert({
title: 'Post One',
body: 'Body of post one',
category: 'News',
tags: ['news', 'events'],
user: {
name: 'John Doe',
status: 'author'
},
date: Date()
})
# Insert Multiple Rows
db.posts.insertMany([
{
title: 'Post Two',
body: 'Body of post two',
category: 'Technology',
date: Date()
},
{
title: 'Post Three',
body: 'Body of post three',
category: 'News',
date: Date()
},
{
title: 'Post Four',
body: 'Body of post three',
category: 'Entertainment',
date: Date()
}
])
# Get All Rows
db.posts.find()
# Get All Rows Formatted
db.posts.find().pretty()
# Find One Row
db.posts.findOne({ category: 'News' })
# Find Rows
db.posts.find({ category: 'News' })
# Find Specific Fields
db.posts.find({ title: 'Post One' }, {
title: 1,
author: 1
})
# Update Row
db.posts.update({ title: 'Post Two' },
{
title: 'Post Two',
body: 'New body for post 2',
date: Date()
},
{
upsert: true
})
# Update Specific Field
db.posts.update({ title: 'Post Two' },
{
$set: {
body: 'Body for post 2',
category: 'Technology'
}
})
# Delete Row
db.posts.remove({ title: 'Post Four' })
# *****************************************************************************
# OTHER FUNCTIONS
# *****************************************************************************
# Sort Rows
db.posts.find().sort({ title: 1 }).pretty() # asc
db.posts.find().sort({ title: -1 }).pretty() # desc
# Count Rows
db.posts.find().count()
db.posts.find({ category: 'news' }).count()
# Limit Rows
db.posts.find().limit(2).pretty()
# Chaining
db.posts.find().limit(2).sort({ title: 1 }).pretty()
# Foreach
db.posts.find().forEach(function(doc) {
print("Blog Post: " + doc.title)
})
# Increment Field (\$inc)
db.posts.update({ title: 'Post Two' },
{
$inc: {
likes: 5
}
})
# Rename Field
db.posts.update({ title: 'Post Two' },
{
$rename: {
likes: 'views'
}
})
# Sub-Documents
db.posts.update({ title: 'Post One' },
{
$set: {
comments: [
{
body: 'Comment One',
user: 'Mary Williams',
date: Date()
},
{
body: 'Comment Two',
user: 'Harry White',
date: Date()
}
]
}
})
# Find By Element in Array (\$elemMatch)
db.posts.find({
comments: {
$elemMatch: {
user: 'Mary Williams'
}
}
}
)
# Add Index
db.posts.createIndex({ title: 1 })
# Drop Index
db.posts.dropIndex("title_1")
# Hide/Unhide Indexes
db.posts.hideIndex("title_1")
db.posts.unhideIndex("title_1")
# Text Search
db.posts.find({
$text: {
$search: "\"Post O\""
}
})
# Greater & Less Than
db.posts.find({ views: { $gt: 2 } })
db.posts.find({ views: { $gte: 7 } })
db.posts.find({ views: { $lt: 7 } })
db.posts.find({ views: { $lte: 7 } })