MongoDB CrashCourse

ComputeFest

Niv Dayan

12 January, 2017

Installation

OSX: https://www.youtube.com/watch?v=G--uGbOFF9E(youmayneedtoadd“sudo”asaprefixtoeveryinstallationcommand)

Windows: https://www.youtube.com/watch?v=K_5mj3-_uJQ

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StartingMongoDB

CommandstorunareinblueStartserver.Openterminalwindowandrun:

mkdir DBmongod --dbpath DB

Startclient.Opendifferentterminalandrun:mongo

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Lookslikethis:

Serverwindow Clientwindow

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CreateaCollection(inclient)

Createadatabaseentryvar customer={name:"bob",balance:100}db.customers.insert(customer)

Wenowhaveonecollectionofcustomersshowcollections

Inthecollection,wehaveonecustomerdb.customers.find()

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PrettyPrinting

Printthingsnicelydb.customers.find().pretty()

NotethateachdocumentwithinacollectionhasauniqueIDthatiscreatedautomatically

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Filtering

Createanothercustomervar customer2={name:"sara",balance:200}db.customers.insert(customer2)

Again,listallcustomers:db.customers.find().pretty()

ListcustomerscalledSaradb.customers.find({name:"sara"}).pretty()

Listcustomerswithbalancegreaterthan150db.customers.find({balance:{$gt:150}}).pretty()

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UpdatingDocuments

Givebobasurnamedb.customers.update(

{name:"bob"},{$set:{surname:"Dylan"}})Add50toBob’saccount

db.customers.update({name:"bob"},{$inc :{balance:50}})

Checkoutcomedb.customers.find().pretty()

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CopyingaDocument

CreateacopyofBobvar cust =db.customers.findOne({name:"bob"})

Printthesurnameofthecopycust["surname"]

Changethesurnameofthecopycust["surname"]="Marley"

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SavingaCopytotheDatabase

Trytosavethecopyinthedatabase(won’twork)db.customers.insert(cust)

GenerateanewobjectIDvar o=ObjectId()

AssignthenewIDtothecopycust["_id"]=o

Nowtrytoinsertagaindb.customers.insert(cust)

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Aggregation

Findsumofallaccountbalancesdb.customers.aggregate([{$group:{

_id:null,total:{$sum:"$balance"}}}])

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Shutdownserver

Shutdowntheserverandquitclientuseadmindb.shutdownServer()exit

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Thanks!

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