MongoDB For Perl Developers{ author: “Ynon Perek” }

Friday, March 1, 13

Whoami

Ynon Perek

http://ynonperek.com

ynon@ynonperek.com

Friday, March 1, 13

Agenda

Mongo Is Awesome

CRUD Operations

The Driver

Coding Time

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Mongo Is Awesome

Data Store for JSON Objects

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Mongo Is Awesome

Data Store for JSON Objects

{ “Name” : “Rose Tyler” }

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JSON Objects

A JSON Object is a collection of key/value pairs

Keys are simple strings

Values can be: Numbers, Strings, Arrays, Other Objects, and more

{  "name" : "Rose Tyler",  "race" : "Human",  "body parts" : [ "head", "legs"]}

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It’s A Document Oriented Data Store

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It don’t do joins

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It don’t do transactions

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Keeping It Simple

Document Oriented

No Transactions

No Joins

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Application Architecture

DBAPP

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What Can Mongo Do For You

Create and store objects

Arrange them in collections

Retrieve them later

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Q & A

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CRUD OperationsCreate, Read, Update and Destroy Data

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Mongo CRUD

Create is called insert

Read is called find

Update is called update

Destroy is called remove

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Mongo CRUD

db.highscore.insert ({"name":"Tom", "score":94});

db.highscore.find ({"name" : "Tom" })

db.highscore.update ({"name" : "Tom"}, {"$inc" : { "score" : 1 } });

db.highscore.remove ({"name" : "Tom"});

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Inserting Data

Use the command insert or save to insert a new object

db.collection.insert( obj );

db.collection.insert( array );

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Inserting Data

Inserting to a new collection creates the collection

Inserting an object with an _id key, it is used as the object’s id (and must be unique).

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Demo: Insert

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find and findOne perform read operations

Both take a query

find returns a cursor

findOne returns an object

db.collection.find( <query>, <projection> )

Reading Data

Optional: Fields to fetch

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Query Document

An empty (or missing) query document returns everything

db.collection.find({})

db.collection.find()

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Query Document

Each key/value pair in the query document imposes a condition on the results (objects that match).

db.movies.find({ “genre” : “indie” });

db.books.find({“pages” : { “$gt” : 100 }});

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Query Document

Each key/value pair in the query document imposes a condition on the results (objects that match).

db.movies.find({ “genre” : “indie” });

db.books.find({“pages” : { “$gt” : 100 }});

Query Object

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Query Document

A compound query means a logical AND on the conditions.

db.inventory.find(  {     “type” : “snacks”,     “available” : { “$lt” : 10 }  });

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Quiz: What Is Returned

{ “publisher” : “DC”}

from alterego publisher

Earth Bruce Wayne DC

Earth Peter Parker Marvel

Krypton Clark Kent DC

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Quiz: What Is Returned

{ “publisher” : “DC”, “from” : “Earth”}

from alterego publisher

Earth Bruce Wayne DC

Earth Peter Parker Marvel

Krypton Clark Kent DC

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Resources

Queries Cheat Sheethttp://www.10gen.com/sites/default/files/downloads/mongodb_qrc_queries.pdf

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Demo: Query

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Update

The general form for update is:

db.collection.update( <query>, <update>, <options> )

Which Entries to update

What to do with them

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Update

Some Update Operators

“$set”, “$inc”

“$push”, “$pushAll”, “$addToSet”

“$pop”, “$pull”, “$pullAll”

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Update: set

$set modifies a value or add a new value

Example:

db.posts.update(  { title: “Why Is Your Cat Unhappy” },  { $set : { “archived” : true } });

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Quiz: $set

Update owners array of the first cat with white color

If you want to update all objects, use multi

db.cats.update( { color: “white” }, { “$set” : { “owners” : [“John”, “Jim”] } } { multi : true });

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Deleting Data

db.posts.remove( { “author” : “Father Angelo” })

db.music.remove({ “genres” : “pop” })

db.posts.remove({ “tags” : “funny” }, 1);

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Q & A

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The Driver

Hello MongoDB

Connecting and Authenticating

Querying/Updating Data

Coding Time

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Hello MongoDB

Mike Friedman, Kristina Chodorow and rafl

MongoDB::Examples

MongoDB::Tutorial

Alternative Driver: Mango

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Hello Mongo

use strict;use warnings;use v5.14;use MongoDB;use Data::Printer; my $client = MongoDB::MongoClient->new;my $db = $client->get_database('demo'); my $coll = $db->get_collection('highscore');my @objects = $coll->find->all; p @objects;

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Inserting Data

use strict;use warnings;use v5.14;use MongoDB; my $client = MongoDB::MongoClient->new;my $db = $client->get_database('demo'); my $coll = $db->get_collection('highscore'); $coll->insert({ name => 'Mike', score => 99 });

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Querying Data

my $cursor = $coll->find({name => 'Tom'}); while ( my $next = $cursor->next ) {  say $next->{name}, " Got: ", $next->{score};}

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Querying Data

Sort, Limit and Skip results using the cursor

my $cursor = $coll->find()-> sort({score => -1})-> limit(3); while ( my $next = $cursor->next ) {  say $next->{name}, " Got: ", $next->{score};}

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Update Data

$coll->update( { name => 'Tom' }, { '$inc' => { score => 1 } } );

$coll->update( { name => 'Tom' }, { '$inc' => { score => 1 } }, { multiple => 1 } );

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Deleting Data

 my $client = MongoDB::MongoClient->new;my $db = $client->get_database('demo'); my $coll = $db->get_collection('highscore'); $coll->remove( { score => { '$gt' => 80 } } );

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Coding Time

Mongo Log Parsing

Mongo Web Address Book

Code Examples At:https://github.com/ynonp/perl-workshop-2013

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Thanks For Listening

Ynon Perek

Slides at:ynonperek.com

Talk to me at: ynon@ynonperek.com

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