This tutorial will introduce quries concept. Refer URL for more info, https://hyperledger.github.io/composer/latest/tutorials/queries.html

YouTube Video, https://www.youtube.com/watch?v=zmm_TXd0o6o

These are JSON values used,

Trader

{ "$class": "org.example.mynetwork.Trader", "tradeId": "Rahul", "firstName": "Jenny", "lastName": "Jones" }

{ "$class": "org.example.mynetwork.Trader", "tradeId": "Modi", "firstName": "Amy", "lastName": "Williams" }

Asset

{ "$class": "org.example.mynetwork.Commodity", "tradingSymbol": "ABC", "description": "Test commodity", "mainExchange": "Euronext", "quantity": 72.297, "owner": "resource:org.example.mynetwork.Trader#Rahul" }

{ "$class": "org.example.mynetwork.Commodity", "tradingSymbol": "APL", "description": "Apple Stock", "mainExchange": "BSE", "quantity": 12.297, "owner": "resource:org.example.mynetwork.Trader#Rahul" }

Transaction

{ "$class": "org.example.mynetwork.Trade", "commodity": "resource:org.example.mynetwork.Commodity#ABC", "newOwner": "resource:org.example.mynetwork.Trader#Modi" }