Tools, FAQ, Tutorials:
Query Chaincode Property on BYFN Channel
How to Query Chaincode Property on BYFN Channel?
✍: FYIcenter.com
An instance of a chaincode can be viewed as an object of a class in an execution environment. It can hold properties.
You can run the "peer chaincode query" command to query the current value of a given property of a given chaincode instance.
1. Verify instantiated chaincode:
$ docker exec -it cli bash bash-4.4# echo $CORE_PEER_ADDRESS peer0.org2.example.com:7051 bash-4.4# peer chaincode list -C mychannel --instantiated Get instantiated chaincodes on channel mychannel: Name: mycc, Version: 1.0, Path: github.com/chaincode/chaincode_example02/go/, \ Escc: escc, Vscc: vscc
2. Query property "a" and "b" of instantiated chaincode "mycc":
bash-4.4# peer chaincode query -C mychannel -n mycc -c '{"Args":["query","a"]}' 100 bash-4.4# peer chaincode query -C mychannel -n mycc -c '{"Args":["query","b"]}' 200
3. Query an unknown property "c":
bash-4.4# peer chaincode query -C mychannel -n mycc -c '{"Args":["query","c"]}' Error: endorsement failure during query. response: status:500 \ message:"{\"Error\":\"Nil amount for c\"}"
4. Query an unknown chaincode instance:
bash-4.4# peer chaincode query -C mychannel -n mycc_x -c '{"Args":["query","a"]}' Error: endorsement failure during query. response: status:500 \ message:"make sure the chaincode mycc_x has been successfully instantiated \ and try again: chaincode mycc_x not found"
⇒ Invoke Chaincode Transaction on BYFN Channel
⇐ Instantiate Chaincode on BYFN Channel
2020-09-30, 999🔥, 0💬
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