====== MongoDB ======

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===== Basics =====
Runs on port:  ''27017''

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===== Show databases =====
<code mongodb>
show dbs
</code>

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===== Create DB =====
<code mongodb>
use db_name # if db_name doesn't exist it will create it
# However, db_name will not be saved unless you create a collection
db.createCollection("Collection0")
</code>

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===== Create user =====
<code mongodb>
# first user
use admin
> db.createUser(
... {
... user: "kalenpw",
... pwd: passwordPrompt(),
... roles: [ { role: "userAdminAnyDatabase", db: "admin" }, "readWriteAnyDatabase" ]
... }
... )

# user for specific database
use db_name
> db.createUser(
... {
... user: "kalenpw",
... pwd: passwordPrompt(),
... roles: [
... { role: "readWrite", db: "locallibrary" }
... ]
... }
... )

</code>

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===== Installation =====
<code bash>
# Ubuntu 20.04
wget -qO - https://www.mongodb.org/static/pgp/server-4.4.asc | sudo apt-key add -
echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/4.4 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-4.4.list
sudo apt update && sudo apt install mongodb-org
</code>

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===== Query =====
<code javascript>
// Find all
db.authors.find(); // can also pass blank filter {}
// find filter
db.authors.find({'first_name': 'Bob'}); // IS case sensitive

// count occurences
db.authors.countDocuments({}) // requires empty filter
</code>
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