一、
参考地址：https://hyperledger-fabric.readthedocs.io/en/latest/write_first_app.html
根据前几节的配置
1、下载代码
git clone https://github.com/hyperledger/fabric-samples.gitcd fabric-samples/fabcar
2、在fabcar下会有如下文件
chaincode invoke.js network package.json query.js startFabric.sh
新版本的示例，chaincode在根目录下
3、开启网络配置[注意docker版本17.06,在1.12.6版本没有-e命令]
./startFabric.sh
4、查询一个账本
安装node
yum install gcc-c++ npm install
查询[注意配置query.js中的ip地址]
node query.js
展示如下数据
Create a client and set the wallet locationSet wallet path, and associate user PeerAdmin with applicationCheck user is enrolled, and set a query URL in the networkMake queryAssigning transaction_id: f2f45cb045d6290d199e1b2d4eb3b60b1e9cafeff8d09e2b7683dd8578492be7returned from queryQuery result count = 1Response is [{"Key":"CAR0", "Record":{"colour":"blue","make":"Toyota","model":"Prius","owner":"Tomoko"}},{"Key":"CAR1", "Record":{"colour":"red","make":"Ford","model":"Mustang","owner":"Brad"}},{"Key":"CAR2", "Record":{"colour":"green","make":"Hyundai","model":"Tucson","owner":"Jin Soo"}},{"Key":"CAR3", "Record":{"colour":"yellow","make":"Volkswagen","model":"Passat","owner":"Max"}},{"Key":"CAR4", "Record":{"colour":"black","make":"Tesla","model":"S","owner":"Adriana"}},{"Key":"CAR5", "Record":{"colour":"purple","make":"Peugeot","model":"205","owner":"Michel"}},{"Key":"CAR6", "Record":{"colour":"white","make":"Chery","model":"S22L","owner":"Aarav"}},{"Key":"CAR7", "Record":{"colour":"violet","make":"Fiat","model":"Punto","owner":"Pari"}},{"Key":"CAR8", "Record":{"colour":"indigo","make":"Tata","model":"Nano","owner":"Valeria"}},{"Key":"CAR9", "Record":{"colour":"brown","make":"Holden","model":"Barina","owner":"Shotaro"}}] 5、分析query.js
1》初始化参数，包含了用户ID，信道，链码，网络连接入口
var options = { wallet_path: path.join(__dirname, './creds'), user_id: 'PeerAdmin', channel_id: 'mychannel', chaincode_id: 'fabcar', network_url: 'grpc://localhost:7051',}; 2》查询代码
var transaction_id = client.newTransactionID(); // queryCar - requires 1 argument, ex: args: ['CAR4'], // queryAllCars - requires no arguments , ex: args: [''], const request = { chaincodeId: options.chaincode_id, txId: transaction_id, fcn: 'queryAllCars', args: [''] }; return channel.queryByChaincode(request); 这里设置了链码ID，交易ID，以及调用的链码的方法fcn，方法参数args等
3》链码：//fabcar/目录下fabcar.go
此文件匹配上文的链码ID，包含了如下方法：initLedger, queryCar,queryAllCars, createCar and changeCarOwner
func (s *SmartContract) queryAllCars(APIstub shim.ChaincodeStubInterface) sc.Response { startKey := "CAR0" endKey := "CAR999" resultsIterator, err := APIstub.GetStateByRange(startKey, endKey) 此处就是查询范围内的数据。
查看所有方法
6、测试
cp query.js query1.js vim query1.js
修改内部访问链码方法
const request = { chaincodeId: options.chaincode_id, txId: transaction_id, fcn: 'queryCar', args: ['CAR4'] }; 执行：node query1.js
Create a client and set the wallet locationSet wallet path, and associate user PeerAdmin with applicationCheck user is enrolled, and set a query URL in the networkMake queryAssigning transaction_id: ca88dc3b60f4df009a709f2f5ee5ad3b54f43d03a7e0b931042e2797f70c795dreturned from queryQuery result count = 1Response is {"colour":"black","make":"Tesla","model":"S","owner":"Adriana"} 7、更新账本数据
使用fabcar目录下的invoke.js
修改，中的 fcn，以及args等参数
var request = { targets: targets, chaincodeId: options.chaincode_id, fcn: '', args: [''], chainId: options.channel_id, txId: tx_id 如下
var request = { targets: targets, chaincodeId: options.chaincode_id, fcn: 'createCar', args: ['CAR10', 'Chevy', 'Volt', 'Red', 'Nick'], chainId: options.channel_id, txId: tx_id 执行命令
node invoke.js
成功后会有
The transaction has been committed on peer localhost:7053
执行
cp query1.js query2.jsvim query2.js
将query2.js中查询条件参数，变为CAR10即可
Response is {"colour":"Red","make":"Chevy","model":"Volt","owner":"Nick"} ok，可以继续调试其他方法。