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• AnexampleofaNoSQL database• Isschema-less– Donotdefinetablesandcolumnsinadvance– Store newdatahoweverisneeded

• Stored asBSON• SimilartoJSON,butwitha fewmoredatatypes

– JSONisessentiallyserializedJavaScriptobjects» I.e. whatJavaScriptobjectswouldlooklikeifrepresentedasanobjectliteral

• ThereforeMongoDB essentiallystoresJavaScriptobjects– Easy tosaveaJavaScriptobject– Easy torestoreasaJavaScriptobject

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• Browse comparisonon:– http://www.mongodb.org/display/DOCS/SQL+to+Mongo+Mapping+Chart

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• ItisunclearwhetheritisbeneficialornottobethinkingintermsofRDBMSandmappingittoMongo.

• Myintuition:– ForgetaboutRDBMSinthiscase– JustseeMongo asasimplewaytostore,query,andretrieveJavaScriptobjects

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• Database– Adatabaseisasetofcollections

• Collections– Acollectionisasetofdocuments

• Documents– Adocumentis(essentially)aJSONstring

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• SaveandfindJSONdocuments– EachJSONdocument isnotrestricted tohavethesamestructure,buttheymostlydo

– Eachdocumenthas(globally) unique_id• ACollection isasetofJSONdocuments• ADatabaseis asetofJSONcollections

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• What ispassedtomongodb:{"name":"apple","price":1.99}

• Mongodb addsinan_id:{"name":"apple","price":1.99,"_id":ObjectId("35414c4ebb264d7000000000")}

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• Mongod – theMongoDB databaseserver– Listensbydefaultonport27017– Requests/responsesviaaMongoDB protocol

• Mongo– aMongoDB shellapplication– AJavaScript shelltointeractwithMongoDB– Candoalldatabaseoperations

• MongoDB drivers– Existformany languages– Providesalanguage-specificAPIforinteractingwithMongoDB

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• Scan:– https://www.mongodb.com/who-uses-mongodb

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• SQL and NoSQLDBMSseachhavetheirstrengths• Ourpurposein67-328:– Exposure:havebasicknowledgeofit– AneasywaytostoreandretrievedatainaformveryclosetoJavaScriptobjects(BSON)

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• Browseto:https://docs.mongodb.com/manual/administration/install-community/

• Followthedownloadinstructions:–MacOS:IfoundinstallingHomeBrew andthenMongoDB tobeeasy.

• Experimentwithmongoshell:– Start:https://docs.mongodb.org/getting-started/shell/import-data/

– FollowtheirexamplethroughRemoveData

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• Studio3Thasafreeversiontoview/editmongoDB databases

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• Inthemongoshell,youcandirectlyinteractwiththemongod inaREPL.

• Tointeractwithmongod fromwithinanodeprogram,usethenpm modulemongodb:– npm installmongodb -- save

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• Runmongodb• Runmongo• Runmongodb example

• YoucanfindtheAPIforthedemonstratedcollectionmethodsat:– http://mongodb.github.io/node-mongodb-native/2.2/api/Collection.html

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• DuebyWednesday(orfirst10mininclass):– mLab Introduction

• DueNovember20– ImplementsimpleCRUDoperationsforwhatyouarepersistinginyourfinalproject.

– Haveatleastasinglewebpagefromwhichyoucanget,post,(put,)anddeletedocumentstoaMongoDBdatabase.

– Youdon'thavetodoallyourfinalprojectcollections,butyouneedtodoonecollectionofdocuments,andatleast3attributesperdocument.

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