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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Range queries
As well as retrieving assets with a unique key, SHIM offers API functions the opportunity to retrieve sets of assets based on a range criteria. Moreover, composite keys can be modeled to enable queries against multiple components of the key.
The range functions return an iterator (StateQueryIteratorInterface) over a set of keys matching the query criteria. The returned keys are in lexical order. The iterator must be closed with a call to the function Close(). Additionally, when a composite key has multiple attributes, the range query function, GetStateByPartialCompositeKey(), can be used to search for keys matching a subset of the attributes.
For example, the key of a payment composed of TradeId and PaymentId can be searched ...
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