A practical intro to web development with mongo db and nodejs when, why and how v2

By
Jorge Garifuna
Professional Web Developer
info@GariDigital.com
213-915-4402

JGari.com/resume

Twitter: @jgarifuna

SMS your Name and Email to:

213-985-4413
SMS your name & email to: 213-985-4413 JGari.com/resume

1. A Database that stores data (documents)
2. A NoSQL Database
1. NoSQL = Not only SQL
3. Uses JSON for interaction
1. JSON = JavaScript Object Notation
4. Managed by 10gen company


1. Scalable
2. High performance
3. Open source
4. Written in C++
5. Humongous 


1. Document-Oriented Storage
2. Full Index Support
3. Replication & High Availability: Mirror across
LAN/WAN
4. Auto-Sharding: Scale horizontally
5. Map/Reduce: aggregation & data processing
6. GridFS: Store files of any size


1. Not a Relational Database (RDBMS)
2. Not ideal for every scenario


Relational Database Table/Records MongoDB Collection/Documents

id firstName lastName age id: 1
firstName: Jorge
lastName: Garifuna
1 Jorge Garifuna 85 age: 85
id: 2
2 Jimmy Smith 30 firstName: Jimmy
lastName: Smith
age: 30

id: 3
firstName: Alan
lastName: Jones
age: 25
city: Los Angeles
state: CA

1. I dig alpha products
2. Beta products are my cut of tea
3. I only consider stable products


Credit: Sanjeev Mishra


1. When you need flexibility in your data
2. When you want to easily scale
3. When your dataset does not have zillions
of joins


MySQL executable Oracle executable Mongo executable
mysqld oracle mongod
mysql sqlplus mongo
MySQL term Mongo term/concept
database database
table collection
index index
row BSON document
column BSON field
join embedding and linking
primary key _id field
group by aggregation

Source: http://www.mongodb.org/display/DOCS/SQL+to+Mongo+Mapping+Chart


1. Download from
1. http://www.mongodb.org/downloads
2. Unzip package
3. Run the following from terminal
1. sudo mkdir -p /data/db
2. sudo chown `id -u` /data/db
4. Add to path
1. Mac example: export PATH=/Users/jgarifuna/jg/net/Dev/db/mongodb-osx-x86_64-
2.2.1-rc0/bin:$PATH

2. Linux example: PATH=/home/jgarifuna/mongo-linux-2.2.1/bin:$PATH


1. If added to path in command line type
1. mongod
2. If not on path
1. Access the bin folder on mongo folder
2. Type: ./mongod


1. If added to path in command line type
1. mongo
2. If not on path
1. Access the bin folder on mongo folder
2. Type: ./mongo


1. Databases are created automatically
2. Tables are created automatically
3. Primary key is created automatically


SQL Statement Mongo Statement
INSERT INTO USERS VALUES(3,5) db.users.insert({a:3,b:5})

SELECT * FROM users db.users.find()

UPDATE users SET a=1 WHERE db.users.update({b:'q'}, {$set:{a:1}}, false,
b='q' true)

DELETE FROM users WHERE db.users.remove({z:'abc'});
z="abc"



INSERT INTO USERS VALUES(3,5) db.users.insert({a:3,b:5})



SELECT a,b FROM users db.users.find({}, {a:1,b:1})
SELECT * FROM users db.users.find()
SELECT * FROM users WHERE age=33 db.users.find({age:33})
SELECT a,b FROM users WHERE age=33 db.users.find({age:33}, {a:1,b:1})
SELECT * FROM users WHERE age=33 db.users.find({age:33}).sort({name:1})
ORDER BY name
SELECT * FROM users WHERE age>33 db.users.find({age:{$gt:33}})
SELECT * FROM users WHERE age!=33 db.users.find({age:{$ne:33}})
SELECT * FROM users WHERE age>33 db.users.find({'age':{$gt:33,$lte:40}})
AND age<=40
SELECT * FROM users ORDER BY name db.users.find().sort({name:-1})
DESC
SELECT COUNT(*y) FROM users where db.users.find({age: {'$gt': 30}}).count()
AGE > 30
SELECT COUNT(AGE) from users db.users.find({age: {'$exists':
true}}).count()



UPDATE users SET a=1 WHERE db.users.update({b:'q'}, {$set:{a:1}}, false,
b='q' true)
UPDATE users SET a=a+2 WHERE db.users.update({b:'q'}, {$inc:{a:2}}, false,
b='q' true)



DELETE FROM users WHERE z="abc" db.users.remove({z:'abc'});



Source: http://www.mongodb.org/display/DOCS/Replica+Sets


 On each mongodb instance start service with:
 mongod --rest --replSet myset

Source: http://www.mongodb.org/display/DOCS/Replica+Sets+-+Basics


 Connect to primary server: mongo --host PRIMARY_IP_OR_NAME
 Initialize replica set: rs.initiate()
 If you get error: "local.oplog.rs is not empty on the initiating member. cannot initiate.”
 Fix by typing (source: http://stackoverflow.com/questions/10953752/how-to-modify-replica-set-config):
▪ use local
▪ db.dropDatabase()
▪ Rs.initiate()

 Add secondary node to replica set
 rs.add(‘FIRST_SERVER_NAME_OR_IP’)
 Add arbiter node to replica set
 rs.addArb(‘ARB_SERVER_NAME_OR_IP’)



 Connect to primary server:
 mongo --host PRIMARY_IP_OR_NAME
 Add a document
 Switch to your desire db: use DB_NAME
 db.foo.save({name: “Jorge Garifuna”})
 Set secondary to slave (otherwise you wont be able to see data)
 rs.slaveOk()
 Query secondary
 db.foo.find()


public static function getIpGeoDataFromMongo($ip) {
$rv = array();
if (strlen($ip) > 0) {
$m = new Mongo(); // connect, MongoClient
$db = $m->selectDB("geoip");
$collection_geo_city_blocks = new MongoCollection($db, self::IP_BLOCKS_TABLE_NAME);
$ip = addslashes($ip);
$ip = ip2long($ip);
$query = array('$and' => array (
array( 'startIpNum' => array('$lte' => $ip) ),
array('endIpNum' => array('$gte' => $ip) )
)
);
$cursor = $collection_geo_city_blocks->find($query);
$result = $cursor->getNext();

if (isset($result['locId']) && strlen($result['locId']) > 0) {
$collection_geo_city_locations = new MongoCollection($db, self::IP_LOCATIONS_TABLE_NAME);
$query = array('locId' => $result['locId']);
$cursor = $collection_geo_city_locations->find($query);
$rv = $cursor->getNext();
}
}

return $rv;
}


Some Basic
Node JS stuff

 Platform built on Google Chrome’s JavaScript
Runtime
 For building fast, scalable network applications
 Substitute for Apache/PHP
 But you create your own server code


 Download from
 nodejs.org
 Run installation


var http = require('http');
http.createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello Worldn');
}).listen(1337, '127.0.0.1');
console.log('Server running at http://127.0.0.1:1337/');

1. Create new folder
2. Create testserver.js file and place within folder
3. Run node
1. Node testserver.js
4. On browser go to: http://127.0.0.1:1337

1. A Node JS Application Framework
2. Uses MVC (model, view, controller) pattern


1. From the command line run Node Package
Manager
1. sudo npm install -g express


1. From the command line run
1. Express ./YOUR_APP_NAME
2. Change into your new app folder
1. cd ./YOUR_APP_NAME
3. Install depedencies
1. npm install -d


1. Change into your new app folder
1. cd ./YOUR_APP_NAME
2. Run app with node
1. node app
3. On browser go to URL:
1. http://localhost:3000


1. Download workout web api from
1. https://github.com/donnfelker/workout-tracker
2. Checkout Develop a RESTful API Using Node.js
With Express and Mongoose
1. http://pixelhandler.com/blog/2012/02/09/develop-a-
restful-api-using-node-js-with-express-and-
mongoose/


 While you think…
 Sign up to LAMPsig’s mailing list at:
▪ http://lampsig.org

 Join LAMPsig on Meetup at:
▪ http://www.meetup.com/LAMPsig

 Jorge Garifuna
▪ info@GariDigital.com
▪ @jgarifuna

1. http://www.mongodb.org
2. http://nodejs.org
3. http://expressjs.com
4. http://pixelhandler.com/blog/2012/02/09/dev
elop-a-restful-api-using-node-js-with-
express-and-mongoose
5. http://lampsig.org
6. http://www.meetup.com/LAMPsig


A practical intro to web development with mongo db and nodejs when, why and how v2

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