User:Saul/Mongodb

Access Control

Setup Admin Account

Inside the mongo shell:

use admin

db.createUser({
	user: "admin",
	pwd: "admin",
	roles: [ { role: "userAdminAnyDatabase", db: "admin" } ],
	mechanisms: ["SCRAM-SHA-1"]
});

Then restart MongoDB:

sudo service mongod restart

Connect with:

mongo -u "admin" -p "admin"

Useful Mongodb commands:

show dbs # Shows all databases
use DBNAME # Select the database DBNAME

db.dropDatabase() # delete the current database

show collections # show collections in the current database - collections are a bit like MySQL tables
db.createCollection("CNAME") # creates a collection in the current database
db.CNAME # show documents under collection CNAME - documents are a bit like MySQL rows

db.CNAME.find({}) # return all objects under the collection CNAME
db.CNAME.find({KEY : VALUE}) # return all objects matching the KEY : VALUE pair under the collection CNAME
db.CNAME.find({}).pretty() # return all objects under the collection CNAME in a nicer/readable format
db.CNAME.find({}).sort({units: 1}) # return in ascending order - change to -1 for descending
db.CNAME.find({}).sort({name: 1}) # return in descending alphabetical order - change to -1 for ascending
db.CNAME.find({}).limit(10) # return only the first 10 results

db.CNAME.insert(JSON) # inserts the JSON object into the collection CNAME
db.CNAME.update({ {KEY : VALUE}, {$set: JSON} }) # updates the document found under the collection CNAME with the matching KEY : VALUE pair with the new data - JSON
db.CNAME.update({ {KEY : VALUE}, {$set: JSON} }, {$upsert: true}) # adds new fields in the JSON

db.CNAME.remove({}) # remove all documents from the collection CNAME
db.CNAME.remove({KEY : VALUE}) # remove document that has a matching KEY : VALUE pair from the collection CNAME

{KEY : {$gt : 10}} # returns all items that have KEY value greater than 10
{KEY : {$lt : 10}} # returns all items that have KEY value less than 10
{KEY : { $in : ["VALUE1", "VALUE2"] }} # returns all items that have KEY equal to "VALUE1" and "VALUE2" - VALUE being of type array
{KEY : { $or : [ {KEY: VALUE1}, {KEY: VALUE2} ] }} # returns all items that have KEY equal to VALUE1 or VALUE2