MongoDB for Perl Developers
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This document provides an overview and introduction to using MongoDB with Perl. It discusses how MongoDB is a document-oriented database for storing JSON objects, and how the four basic CRUD operations (create, read, update, delete) work. It also introduces the MongoDB driver for Perl and provides examples for connecting to MongoDB and performing queries, inserts, updates and deletes from Perl code. The document concludes with suggesting some coding exercises to get hands-on experience with MongoDB and Perl.
![JSON Objects
A JSON Object is a
collection of key/
value pairs {
"name" : "Rose Tyler",
Keys are simple "race" : "Human",
strings "body parts" : [ "head", "legs"]
}
Values can be:
Numbers, Strings,
Arrays, Other
Objects, and more
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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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MongoDB for Perl Developers
- 1. MongoDB For Perl Developers { author: “Ynon Perek” } Friday, March 1, 13
- 2. Whoami Ynon Perek http://ynonperek.com [email protected] Friday, March 1, 13
- 3. Agenda Mongo Is Awesome CRUD Operations The Driver Coding Time Friday, March 1, 13
- 4. Mongo Is Awesome Data Store for JSON Objects Friday, March 1, 13
- 5. Mongo Is Awesome Data Store for JSON Objects { “Name” : “Rose Tyler” } Friday, March 1, 13
- 6. JSON Objects A JSON Object is a collection of key/ value pairs { "name" : "Rose Tyler", Keys are simple "race" : "Human", strings "body parts" : [ "head", "legs"] } Values can be: Numbers, Strings, Arrays, Other Objects, and more Friday, March 1, 13
- 7. It’s A Document Oriented Data Store Friday, March 1, 13
- 8. It don’t do joins Friday, March 1, 13
- 9. It don’t do transactions Friday, March 1, 13
- 10. Keeping It Simple Document Oriented No Transactions No Joins Friday, March 1, 13
- 11. Application Architecture APP DB Friday, March 1, 13
- 12. What Can Mongo Do For You Create and store objects Arrange them in collections Retrieve them later Friday, March 1, 13
- 13. Q&A Friday, March 1, 13
- 14. CRUD Operations Create, Read, Update and Destroy Data Friday, March 1, 13
- 15. Mongo CRUD Create is called insert Read is called find Update is called update Destroy is called remove Friday, March 1, 13
- 16. Mongo CRUD db.highscore.insert ({"name":"Tom", "score":94}); db.highscore.find ({"name" : "Tom" }) db.highscore.update ({"name" : "Tom"}, {"$inc" : { "score" : 1 } }); db.highscore.remove ({"name" : "Tom"}); Friday, March 1, 13
- 17. Inserting Data Use the command insert or save to insert a new object db.collection.insert( obj ); db.collection.insert( array ); Friday, March 1, 13
- 18. Inserting Data Inserting to a new collection creates the collection Inserting an object with an _id key, it is used as the object’s id (and must be unique). Friday, March 1, 13
- 19. Demo: Insert Friday, March 1, 13
- 20. Reading Data find and findOne perform read operations Both take a query find returns a cursor findOne returns an object Optional: Fields to fetch db.collection.find( <query>, <projection> ) Friday, March 1, 13
- 21. Query Document An empty (or missing) query document returns everything db.collection.find({}) db.collection.find() Friday, March 1, 13
- 22. Query Document Each key/value pair in the query document imposes a condition on the results (objects that match). db.movies.find({ “genre” : “indie” }); db.books.find({“pages” : { “$gt” : 100 }}); Friday, March 1, 13
- 23. Query Document Query Object 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” : { “$gt” : 100 }}); Friday, March 1, 13
- 24. Query Document A compound query means a logical AND on the conditions. db.inventory.find( { “type” : “snacks”, “available” : { “$lt” : 10 } }); Friday, March 1, 13
- 25. Quiz: What Is Returned from alterego publisher Bruce { Earth DC Wayne “publisher” : “DC” } Peter Earth Marvel Parker Krypton Clark Kent DC Friday, March 1, 13
- 26. Quiz: What Is Returned from alterego publisher { Bruce “publisher” : Earth DC Wayne “DC”, “from” : “Earth” Peter Earth Marvel } Parker Krypton Clark Kent DC Friday, March 1, 13
- 27. Resources Queries Cheat Sheet http://www.10gen.com/sites/default/files/downloads/ mongodb_qrc_queries.pdf Friday, March 1, 13
- 28. Demo: Query Friday, March 1, 13
- 29. Update The general form for update is: db.collection.update( <query>, <update>, <options> ) Which Entries What to do with to update them Friday, March 1, 13
- 30. Update Some Update Operators “$set”, “$inc” “$push”, “$pushAll”, “$addToSet” “$pop”, “$pull”, “$pullAll” Friday, March 1, 13
- 31. Update: set $set modifies a value or add a new value Example: db.posts.update( { title: “Why Is Your Cat Unhappy” }, { $set : { “archived” : true } } ); Friday, March 1, 13
- 32. 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 } ); Friday, March 1, 13
- 33. Deleting Data db.posts.remove( { “author” : “Father Angelo” }) db.music.remove({ “genres” : “pop” }) db.posts.remove({ “tags” : “funny” }, 1); Friday, March 1, 13
- 34. Q&A Friday, March 1, 13
- 35. The Driver Hello MongoDB Connecting and Authenticating Querying/Updating Data Coding Time Friday, March 1, 13
- 36. Hello MongoDB Mike Friedman, Kristina Chodorow and rafl MongoDB::Examples MongoDB::Tutorial Alternative Driver: Mango Friday, March 1, 13
- 37. 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; Friday, March 1, 13
- 38. 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 }); Friday, March 1, 13
- 39. Querying Data my $cursor = $coll->find({name => 'Tom'}); while ( my $next = $cursor->next ) { say $next->{name}, " Got: ", $next->{score}; } Friday, March 1, 13
- 40. 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}; } Friday, March 1, 13
- 41. Update Data $coll->update( { name => 'Tom' }, { '$inc' => { score => 1 } } ); $coll->update( { name => 'Tom' }, { '$inc' => { score => 1 } }, { multiple => 1 } ); Friday, March 1, 13
- 42. Deleting Data my $client = MongoDB::MongoClient->new; my $db = $client->get_database('demo'); my $coll = $db->get_collection('highscore'); $coll->remove( { score => { '$gt' => 80 } } ); Friday, March 1, 13
- 43. Coding Time Mongo Log Parsing Mongo Web Address Book Code Examples At: https://github.com/ ynonp/perl- workshop-2013 Friday, March 1, 13
- 44. Thanks For Listening Ynon Perek Slides at: ynonperek.com Talk to me at: [email protected] Friday, March 1, 13