JSON Web Databases Applied JSON: HTTP REST, Ajax databases and beyond Kris Zyp

Applied JSON: HTTP REST, Ajax databases and beyond

Kris Zyp

HTTP/REST + JSON = Database interaction for the web

Overview Interoperability Basics Tools/Frameworks Beyond simple CRUD

Interoperability Basics

Tools/Frameworks

Beyond simple CRUD

Interoperability Basics HTTP REST GET - query and get by id PUT - update an object POST - create an object DELETE - delete an object

HTTP REST

GET - query and get by id

PUT - update an object

POST - create an object

DELETE - delete an object

Tools/Frameworks Client Side Persevere Jester Dojo Server Side ActiveResource CouchDB Persevere GrassyKnoll ...

Client Side

Persevere

Jester

Dojo

Server Side

ActiveResource

CouchDB

Persevere

GrassyKnoll

...

Standard Conventions Objects/records accessible by /table/id /Product/12 GET, PUT, and DELETE this resource Sub object URLs determined by object identity properties GET /Product/ [{“id”:”11”, “name”:”Dérailleur”}, {“id”:”12”, “name”:”Handle Bar”}]

Objects/records accessible by /table/id

/Product/12

GET, PUT, and DELETE this resource

Sub object URLs determined by object identity properties

GET /Product/ [{“id”:”11”, “name”:”Dérailleur”}, {“id”:”12”, “name”:”Handle Bar”}]

The post-ORM realm

Schemas DB defined schema - ActiveRecord Schema free - CouchDB

DB defined schema - ActiveRecord

Schema free - CouchDB

Evolutionary Schema: Persevere

JSON Schema based evolutionary schema Start without a schema Add constraints as application evolves

JSON Schema schema: {"description":"A person", "type":"object", "properties": {"name": {"type":"string"}, "age" : {"type":"integer", "maximum":125}} } instance: {“name”:”Kris”, “ age”:30}

JSON Schema driven UI Start with schema and simple form

Querying Web-safe portability important SQL extremely hard to make secure and too complicated in the browser JSONPath JavaScript-style syntax Language agnostic Easy to secure http://goessner.net/articles/JsonPath/

Web-safe portability important

SQL extremely hard to make secure and too complicated in the browser

JSONPath

JavaScript-style syntax

Language agnostic

Easy to secure

JSONPath http://goessner.net/articles/JsonPath/ XPath like query language for JSON Filters - [?expr] Properties/paths (like JS) - .prop Recursive descent - ..prop Slice operator – [3:10:2] Union operator - [3,4,5]

JSONPath querying in requests REST URLs + JSONPath = Web querying /Table/ - All the objects in a table /Table/[?@.price < 10] – all items with a price under $10 /Table/..name – A list of the name property values /Table/.length – A count of the items in the table

JSONQuery http://www.sitepen.com/blog/2008/07/16/jsonquery-data-querying-beyond-jsonpath/ Lenient Syntax - ?price<10 Sorting - [/price,
ating] Mapping - [=firstName+' '+lastName] Wildcarding [?description='*fun*'] Recursive object filter - ..[?name='Bar'] Example URL: /Table/[?price<10] [={name:name, rating: rating}] [
ating]

JSON Referencing Hyperlinking + JSON Cyclic Multiple references Cross-message references Cross-site references http://www.sitepen.com/blog/2008/06/17/json-referencing-in-dojo/

Hyperlinking + JSON

Cyclic

Multiple references

Cross-message references

Cross-site references

JSON Referencing http://www.sitepen.com/blog/2008/07/16/jsonquery-data-querying-beyond-jsonpath/ { “ name”:”Kris Zyp”, “ id”:”kriszyp”, “children”:[{“id”:”jennikazyp”,“name”:”Jennika Zyp”}], “ spouse”:{ “ name”:”Nicole Zyp”, “spouse”:{“$ref”:”kriszyp”}, “ children”:[{“$ref”:”jennikazyp”}] } }

{

“ name”:”Kris Zyp”,

“ id”:”kriszyp”, “children”:[{“id”:”jennikazyp”,“name”:”Jennika Zyp”}],

“ spouse”:{

“ name”:”Nicole Zyp”, “spouse”:{“$ref”:”kriszyp”},

“ children”:[{“$ref”:”jennikazyp”}]

}

}

JSON Referencing http://www.sitepen.com/blog/2008/07/16/jsonquery-data-querying-beyond-jsonpath/ { “ name”:”Kris Zyp”, “children”:[{“name”:”Jennika Zyp”}], “ spouse”:{ “ name”:”Nicole Zyp”, “spouse”:{“$ref”:”#”}, “ children”:{“$ref”:”#.children”} } }

{

“ name”:”Kris Zyp”, “children”:[{“name”:”Jennika Zyp”}],

“ spouse”:{

“ name”:”Nicole Zyp”, “spouse”:{“$ref”:”#”},

“ children”:{“$ref”:”#.children”}

}

}

JSON Referencing http://www.sitepen.com/blog/2008/07/16/jsonquery-data-querying-beyond-jsonpath/ { “ name”:”Kris Zyp”, “ id”:”kriszyp”, “children”:[{“name”:”Jennika Zyp”}], “ friends”:[{“$ref”:”jesse#.spouse”}] }

{

“ name”:”Kris Zyp”,

“ id”:”kriszyp”, “children”:[{“name”:”Jennika Zyp”}],

“ friends”:[{“$ref”:”jesse#.spouse”}]

}

Server side JavaScript + web storage http://sitepen.com/labs/persevere.php &quot;schema&quot;:{ “ name”:”Friend”, “ properties”:{ “ firstName”:{“type”:”string”}, “age”:{“type”:”integer”}, } &quot;staticCreateMethod&quot;:function(arg1){ var friend = new Friend; friend.age = 0; }, &quot;prototype&quot;:{ “ myMethod”:function(){ return this.firstName + ‘ ‘ + this.lastName; } } &quot;extends&quot;:{&quot;$ref&quot;:&quot;../Person&quot;} }

&quot;schema&quot;:{

“ name”:”Friend”,

“ properties”:{

“ firstName”:{“type”:”string”}, “age”:{“type”:”integer”},

}

&quot;staticCreateMethod&quot;:function(arg1){

var friend = new Friend;

friend.age = 0;

},

&quot;prototype&quot;:{

“ myMethod”:function(){

return this.firstName + ‘ ‘ + this.lastName;

}

}

&quot;extends&quot;:{&quot;$ref&quot;:&quot;../Person&quot;}

}

Security with web accessible data storage Typical databases behind the application Web DBs are directly accessible User authorization becomes integrated with data Allows separation of application and security concerns

Typical databases behind the application

Web DBs are directly accessible

User authorization becomes integrated with data

Allows separation of application and security concerns

Security with Persevere Data-centric Capability-based Logic/code based security possible as well

Data-centric

Capability-based

Logic/code based security possible as well

Transactions

Live Data Notifications with REST Channels http://cometdaily.com/2008/05/13/http-channels-2/

Other Features File storage/alternate resource representations Utilize existing SQL tables SMD support Class/Table Inheritance

File storage/alternate resource representations

Utilize existing SQL tables

SMD support

Class/Table Inheritance

Persevere JSONQuery/JSONPath JSON Referencing Comet Live Data Notifications JSON Schema with evolutionary constraints JSON-RPC Built-in Security Standards based REST interface http://sitepen.com/labs/persevere.php

JSONQuery/JSONPath

JSON Referencing

Comet Live Data Notifications

JSON Schema with evolutionary constraints

JSON-RPC

Built-in Security

Standards based REST interface

REST/ Ajax databases Develop for the future