The JSON agenda 17:00 Welcome to JSON: What is JSON, and why should I care about JSON? RESTfull webservices and JSON Microservices and …. JSON 18:30 A break from JSON: A JSON sandwich and a cup of JSON 18:50 Yet more JSON: The Watson JSON API JSON and JAVA JSON in DB2 20:00 It’s time to say good bye to JSON.

But first: 1) Power up your smartphone !!! 2) Enter kahoot.it in your browser It’s time for quizzzzz.. … it’s Kahoot time !!!!!

JSON Publishing functions JSON support in DB2 for i JSON Publishing functions JSON_ARRAY JSON_ARRAYAGG JSON_OBJECT JSON_OBJECTAGG JSON Query support Predicates: IS JSON JSON_EXISTS Scalar functions: JSON_QUERY() JSON_VALUE() DB2 JSON Store JSON_TABLE() June 2015 November 2016 TBD TBD First DB2 Family member to have JSON_TABLE support (note that Oracle has it already) Why invest in adding JSON into DB2 for i? JSON is very popular SQL Standards body is adopting this into the standard IBM i 7.1, 7.2, & 7.3 IBM i 7.2 & 7.3

JSON_TABLE Converts a JSON expression into relational data JSON-expressions can be: Character or Graphic (use FORMAT JSON) Binary (use FORMAT BSON) JSON path expression lax Structural problems are tolerated Arrays are automatically unnested strict Structural problems result in an error Arrays are not automatically unnested Can leverage HTTP Functions SELECT * FROM JSON_TABLE( <JSON-expression> , <JSON-path-expression> COLUMNS ( <column-definitions> ) <error-option> FORMAT BSON would equate to using the DB2 JSON Store: http://www.ibm.com/developerworks/ibmi/library/i-json-store-technology/index.html

JSON Object SELECT * FROM JSON objects are represented using a list of key-value pairs Curly braces { } indicate object start and end Value Pairs are separated by commas Keys and values separated by colons SELECT * FROM json_table('{"first":"John","last":"Doe"}', '$' columns("first" VARCHAR(40), "last" VARCHAR(40))) x;

What is JSON Lightweight transporter protocol Any abstract data types Any complex data Human readable Easy to parse in any environment (IoT) Easy to produce Cross age/culture developer Esperanto Only by simple components: Primitives, arrays and object

A humongous number of JSON transactions Why is JSON A humongous number of JSON transactions New design paradigms – MVC / MVVM Simple to produce in RESTfull services

Model View Control? MVC / MVVM Controller Client Web Server IBMi

It is easy to produce

But - what is wrong in this picture? Access the HTTP protocol header Access the URL directly Static binding to SQL table layout Construct the JSON by hand and send it by HTTP

What is wrong in this picture PLUMBING!! Error prone to the output quality ( well formed JSON) Require knowledge of the HTTP protocol Is only accessible from the HTTP protocol Can not be reused, ( called from an other application) Can not be unit tested Hard to extend Hard to debug

Why micro services? Run in any environment. JSON in, JSON out. Easy unit testing Graceful error handling. Can be written in any language Can be reused, called from an other application Don’t rely on HTTP – why not a dataqueue? Easy to debug Easy to extend Require some kind of routing

Micro services in node.js Seneca Is a micro service framework for node.js – Can we make it run on power – let’s try: ssh or call qp2term on your IBMi ( mine is dksrv206) Mkdir /seneca git -c http.sslVerify=false clone https://github.com/senecajs-attic/getting-started.git cd getting-started Npm install echo "require('seneca')().use('math').listen()" > msTest.js node msTest.js Now try this in your browser: http://dksrv206:10101/act?role=math&cmd=sum&left=1&right=2

Any language? Yes: you can make microservices with almost all languages: JAVA – with the spring framework node.js – seneca RPG with noxDB / icebreak

It’s JSON break time

Let’s talk with Watson Watson has an REST api we can utilize. Let’s play