## 1. 釋義 獲取并顯示鏈碼函數調用的背書結果。該命令不會生成交易。 ## 2. 使用方法 ``` ~$ peer chaincode query [flags] ``` ## 3. 命令標志 ``` -C, --channelID string The channel on which this command should be executed --connectionProfile string Connection profile that provides the necessary connection information for the network. Note: currently only supported for providing peer connection information -c, --ctor string Constructor message for the chaincode in JSON format (default "{}") -h, --help help for query -x, --hex If true, output the query value byte array in hexadecimal. Incompatible with --raw -n, --name string Name of the chaincode --peerAddresses stringArray The addresses of the peers to connect to -r, --raw If true, output the query value as raw bytes, otherwise format as a printable string --tlsRootCertFiles stringArray If TLS is enabled, the paths to the TLS root cert files of the peers to connect to. The order and number of certs specified should match the --peerAddresses flag ``` 全局標志： ``` --cafile string Path to file containing PEM-encoded trusted certificate(s) for the ordering endpoint --certfile string Path to file containing PEM-encoded X509 public key to use for mutual TLS communication with the orderer endpoint --clientauth Use mutual TLS when communicating with the orderer endpoint --connTimeout duration Timeout for client to connect (default 3s) --keyfile string Path to file containing PEM-encoded private key to use for mutual TLS communication with the orderer endpoint -o, --orderer string Ordering service endpoint --ordererTLSHostnameOverride string The hostname override to use when validating the TLS connection to the orderer. --tls Use TLS when communicating with the orderer endpoint --transient string Transient map of arguments in JSON encoding ``` ## 4. 示例代碼 下面的示例使用`peer chaincode query`命令，通過版本為1.0的鏈碼mycc查詢節點賬本的變量a的值： ``` ~$ peer chaincode query -C mychannel -n mycc -c '{"Args":["query","a"]}' 2018-02-22 16:34:30.816 UTC [chaincodeCmd] checkChaincodeCmdParams -> INFO 001 Using default escc 2018-02-22 16:34:30.816 UTC [chaincodeCmd] checkChaincodeCmdParams -> INFO 002 Using default vscc Query Result: 90 ``` 可以看到，在查詢時變量a的值為90。