How it works...

This concludes the recipe to create and deploy your first smart contract chaincode.

In the previous steps, we used query.js to query the key-value pair store. We can also query for the values of one or more keys, or perform complex searches on JSON data-storage formats. The following diagram shows how the query works:

The following is a representation of different functions in chaincode, which explains that we should first define the code functions to all the available APIs in the chaincode interface:

The following diagram shows the process of updating the ledger. Once an update to the ledger is proposed and endorsed, it will be returned to the application, and will in turn send the updated ledger to be ordered and written to every peer's ledger:

We learned how to write a small smart contract chaincode on the Fabric network to perform a transaction data query and update. In the next chapter, you will learn how to write an end-to-end Hyperledger Fabric application using all that we have learned in this chapter.