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Push databases: A better way to build realtime ...
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Jorge Silva
July 08, 2015
Technology
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Push databases: A better way to build realtime apps
Jorge Silva
July 08, 2015
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Transcript
Push databases A better way to build realtime apps Bay
Area OpenSource Palo Alto, CA July 8, 2015
Jorge Silva Developer Evangelist @ RethinkDB @thejsj
Preface Why is realtime important?
Realtime apps
Realtime apps
Realtime apps • More and more apps are built to
be realtime • Users have come to want and expect this behavior in their apps • Building realtime apps is hard
Building realtime apps is hard • You can keep everything
in a single server • You can poll the database to keep track of updates • You can publish updates through a message broker
Building realtime apps is hard • All solutions present a
tradeoff between scalability and complexity • It’s hard to keep track of state in realtime architectures
Introduction What is RethinkDB?
What is RethinkDB? • Open source database for building realtime
web applications • NoSQL database that stores schemaless JSON documents • Distributed database that is easy to scale
Push Database • Subscribe to change notifications from database queries
(changefeeds) • No more polling — the database pushes changes to your app • Reduce the amount of plumbing needed to stream live updates
Push Database • Having your database push changes keeps your
database as the central source of truth • Having a central source of truth simplifies your architecture
Push Database RethinkDB is an excellent database for: • Collaborative
web and mobile apps • Multiplayer games • Streaming analytics apps • Connected devices
Introduction to ReQL RethinkDB Query Language
Introduction to ReQL • ReQL embeds natively into your programming
language • Compose ReQL queries by chaining commands
Anatomy of a ReQL Query r.table("users") .pluck("last_name") .distinct().count() Number of
unique last names
Anatomy of a ReQL Query r.table("users") .pluck("last_name") .distinct().count() Access a
database table
Anatomy of a ReQL Query r.table("users") .pluck("last_name") .distinct().count() Isolate a
document property
Anatomy of a ReQL Query r.table("users") .pluck("last_name") .distinct().count() Consolidate duplicate
values
Anatomy of a ReQL Query r.table("users") .pluck("last_name") .distinct().count() Display the
number of items
Sample ReQL Queries r.table("users") .filter(r.row("age").gt(30)) r.table(“post") .eqJoin(“uId”, r.table(“users”)) .zip() r.table("fellowship")
.filter({species: "hobbit"}) .update({species: "halfling"})
Additional ReQL Features • Geospatial indexing for location- based queries
• Date and time functions • Support for storing binary objects • Execute http requests using r.http
Realtime Updates Working with Changefeeds
Subscribe to change notifications on database queries Changefeeds
r.table("users").changes() Track changes on the users table Changefeeds
Changefeeds • The changes command returns a cursor that receives
updates • Each update includes the new and old value of the modified record
Changefeeds r.table("users").changes() r.table("users") .insert({name: "Bob"}) Changefeed output: { new_val: {
id: '362ae837-2e29-4695-adef-4fa415138f90', name: 'Bob', ... }, old_val: null }
Changefeeds r.table("users").changes() r.table("users") .filter({name: "Bob"}).delete() Changefeed output: { new_val: null,
old_val: { id: '362ae837-2e29-4695-adef-4fa415138f90', name: 'Bob', ... } }
Changefeeds r.table("users").changes() r.table("users") .get("362ae837-2e29-4695-adef-4fa415138f90") .update({name: "Bobby"}) Changefeed output: { new_val:
{ id: '362ae837-2e29-4695-adef-4fa415138f90', name: 'Bobby' }, old_val: { id: '362ae837-2e29-4695-adef-4fa415138f90', name: 'Bob' } }
Changefeeds r.table("players") .orderBy({index: r.desc("score")}) .limit(3).changes() Track top three players by
score Chain the changes command to an actual ReQL query:
Questions http://questions.rethinkdb.com
Summary • Keeping track of state in realtime apps is
hard • RethinkDB solves this problem by pushing changes to your app • In the future, we'll see more database that use the push model
Questions • RethinkDB website: http://rethinkdb.com • Install RethinkDB: http://rethinkdb.com/install/ •
Email me: jorge@rethinkdb.com • Tweet: @thejsj, @rethinkdb