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installing MongoDB on Mac

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mongodb.org/downloads

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always use 64-bit versions

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32-bit are only suitable for development

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they limit total amount of data to 4 GB

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stable releases are always even, e.g. 2.6.0

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terminal window

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tar xvf mongodb-osx-x86_64-2.6.0.tgz

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cd into it

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bin where the action is

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mongo is shell to connect database

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mongod runs the server

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sudo bash

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mkdir -p /data/db

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chmod 777 /data/db

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not good for production of course

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start mongo server

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./mongod

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starts up

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listening on port 27017 (default)

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start mongo shell

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./mongo

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test

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db.names.insert({'name':'Joe'})

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db.names.find()

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installing on Windows

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mongodb.org/downloads

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always 64-bit if you can

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find out:

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powershell

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wmic os get osarchitecture

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130 MB

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in Program Files

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server:

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mongod.exe

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\data\db does not exist

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create directories

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client

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new window

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mongo.exe

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db.names.insert({'name':'Joe'})

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db.names.find()

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introduction to Mongo shell

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show dbs

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use demo (creates it since it doesn't exist)

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db.things.insert({'a':1, 'b': 2, 'c': 3})

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db.things.insert({'d':4, 'e': 5})

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db.things.find({'a':1})

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we are in a complete javascript environment, so we can do anything that is supported by the V8 javascript engine

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for (var i = 0; i <= 10; i++) { db.things.insert({'x':i})}

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JSON

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basic structure

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human readable format

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key/value pairs

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ObjectId field unique across system

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value types

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many different value types

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you can have same keys with different types

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basic nesting

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nested array: 'colors' : ['red','black']

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nested object (with attributes with key/values)

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deep nesting

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students with names and activities

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you can show it like a javascript object

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and modifty it as a json object

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installing node.js

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install on Mac

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nodejs.org

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click install

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run through it

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test

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node

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console.log("hello world");

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install on windows

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nodejs.org

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download, install

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go to: C:\Program Files\nodejs\

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node.exe

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console.log('hello world');

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asynchronous vs. synchronous

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two ways of handling operations that don't require active work on the currently running thread or process

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usually these are referring to IO

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mongo shell is synchronous while node.js is asynchronous

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mongo shell

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var doc = db.coll.findOne();

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printjson(doc);

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node.js

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overhead code to connect to db

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not getting a return value but passing a callback function, passing an err and document value

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...function(err,doc) {

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db.close();

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advantage of asynchronous is that it can handle a large number of users

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the mongo shell blocks other users until the values come back from the db

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run it:

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mongo script.js

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node app.js

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helloworld server in node.js

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console.log('testing');

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now make web server

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var http = require('http');

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var server = http.createServer(function (request, response) {...

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then http://localhost:8000/

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see: howtonode.org/hello-node