Table of contents
- Show All Databases
- Show Current Database
- Create Or Switch Database
- Drop
- Create Collection
- Show Collections
- Insert Row
- Insert Multiple Rows
- Get All Rows
- Get All Rows Formatted
- Find Rows
- Sort Rows
- Count Rows
- Limit Rows
- Chaining
- Foreach
- Find One Row
- Find Specific Fields
- Update Row
- Update Specific Field
- Increment Field (\$inc)
- Rename Field
- Delete Row
- Sub-Documents
- Find By Element in Array (\$elemMatch)
- Add Index
- Text Search
- Greater & Less Than
Show All Databases
show dbs
Show Current Database
db
Create Or Switch Database
use acme
Drop
db.dropDatabase()
Create Collection
db.createCollection('posts')
Show Collections
show collections
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.find().pretty()
Find Rows
db.posts.find({ category: 'News' })
Sort Rows
# asc
db.posts.find().sort({ title: 1 }).pretty()
# desc
db.posts.find().sort({ title: -1 }).pretty()
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)
})
Find One Row
db.posts.findOne({ 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'
}
})
Increment Field (\$inc)
db.posts.update({ title: 'Post Two' },
{
$inc: {
likes: 5
}
})
Rename Field
db.posts.update({ title: 'Post Two' },
{
$rename: {
likes: 'views'
}
})
Delete Row
db.posts.remove({ title: 'Post Four' })
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: 'text' })
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 } })
ย