March 2019
Intermediate to advanced
636 pages
27h 50m
English
book
Blockchain Development with Hyperledger
by Salman A. Baset, Luc Desrosiers, Nitin Gaur, Petr Novotny
Content preview from Blockchain Development with Hyperledger
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Query file (.qry)
A query file defines the queries that are used to return data about the blockchain world state. The query syntax is quite similar to SQL language, for example:
query queryName { description: "Select SampleAsset by assetId " statement: SELECT org.example.basic.SampleAsset WHERE (_$assetId = assetId)}
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.