Get Count of assets in HyperLedger Composer Query?

问题

I want to write a query in HyperLedger Composer that returns me the count of assets that I have in hyper ledger. I have thousands of records. I don't want to fetch them all and calculate count. Data transfer will be slow

I want the query to return the count.

回答1:

Unfortunately there is no count in the composer query language.

You would have to create a query to select all the assets then check the length of the results. For example with the Basic Sample Network:

query selectAssets {
 description: "Select all assets"
 statement:
   SELECT org.example.basic.SampleAsset
}

then execute it:

let results = await query('selectAssets');
let count = results.length;

来源：https://stackoverflow.com/questions/52663196/get-count-of-assets-in-hyperledger-composer-query