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10.3 数字货币发行与管理示例
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简介
该智能合约实现一个简单的商业应用案例,即数字货币的发行与转账。在这之中一共分为三种角色:中央银行,商业银行,企业。其中中央银行可以发行一定数量的货币,企业之间可以进行相互的转账。主要实现如下的功能:
1.初始化中央银行及其发行的货币数量
2.新增商业银行,同时央行并向其发行一定数量的货币
3.新增企业
4.商业银行向企业转给一定数量的数字货币
5.企业之间进行相互的转账
6.查询企业、银行、交易信息
init:初始化中央银行,并发行一定数量的货币;
invoke:调用合约内部的函数;
query:查询相关的信息;
createBank:新增商业银行,同时央行向其发行一定数量的货币;
createCompany:新增企业;
issueCoin:央行再次发行一定数量的货币(归于交易);
issueCoinToBank:央行向商业银行转一定数量的数字货币(归于交易);
issueCoinToCp:商业银行向企业转一定数量的数字货币(归于交易行为);
transfer:企业之间进行相互转账(归于交易行为);
getCompanys:获取所有的公司信息,如果企业个数大于10,先访问前10个;
getBanks:获取所有的商业银行信息,如果商业银行个数大于10,先访问前 10 个
getTransactions:获取所有的交易记录 如果交易个数大于10,先访问前 10 个;
getCompanyById:获取某家公司信息;
getBankById:获取某家银行信息;
getTransactionBy:获取某笔交易记录;
writeCenterBank:修改央行信息;
writeBank:修改商业银行信息;
writeCompany:修改企业信息;
writeTransaction:写入交易信息。
1.centerBank 中央银行
Name:名称
TotalNumber:发行货币总数额
RestNumber:账户余额
ID:ID固定为 0
Name:名称
TotalNumber:收到货币总数额
RestNumber:账户余额
ID:银行 ID
Name:名称
Number:账户余额
ID:企业 ID
FromType:发送方角色 //centerBank:0,Bank:1,Company:2
FromID:发送方 ID
ToType:接收方角色 //Bank:1,Company:2
ToID:接收方 ID
Time:交易时间
Number:交易数额
ID:交易 ID
init
request 参数:
args[0] 银行名称 args[1] 初始化发布金额
response 参数:
{"Name":"XXX","TotalNumber":"0","RestNumber":"0","ID":"XX"}
createBank
request 参数:
args[0] 银行名称
response 参数:
{"Name":"XXX","TotalNumber":"0","RestNumber":"0","ID":"XX"}
createCompany
request 参数:
args[0] 公司名称
response 参数:
{"Name":"XXX","Number":"0","ID":"XX"}
request 参数:
args[0] 再次发行货币数额
response 参数:
{"FromType":"0","FromID":"0","ToType":"0","ToID":"0","Time":"XX","Number":"XX","ID":"XX"}
request 参数:
args[0] 商业银行ID
args[1] 转账数额
response 参数:
{"FromType":"0","FromID":"0","ToType":"1","ToID":"XX","Time":"XX","Number":"XX","ID":"XX"}
request 参数:
args[0] 商业银行ID
args[1] 企业ID
args[2] 转账数额
response 参数:
{"FromType":"1","FromID":"XX","ToType":"2","ToID":"XX","Time":"XX","Number":"XX","ID":"XX"}
request 参数:
args[0] 转账用户ID
args[1] 被转账用户ID
args[2] 转账余额
response 参数:
{"FromType":"2","FromID":"XX","ToType":"2","ToID":"XX","Time":"XX","Number":"XX","ID":"XX"}
response 参数:
[{"Name":"XXX","Number":"XX","ID":"XX"},{"Name":"XXX","Number":"XX","ID":"XX"},...]
getCompanys
response 参数:
[{"Name":"XXX","TotalNumber":"XX","RestNumber":"XX","ID":"XX"},{"Name":"XXX","TotalNumber":"XX","RestNumber":"XX","ID":"XX"},...]
response 参数:
[{"FromType":"XX","FromID":"XX","ToType":"XX","ToID":"XX","Time":"XX","Number":"XX","ID":"XX"},{"FromType":"XX","FromID":"XX","ToType":"XX","ToID":"XX","Time":"XX","Number":"XX","ID":"XX"},...]
response 参数:
[{"Name":"XX","TotalNumber":"XX","RestNumber":"XX","ID":"XX"}]
request 参数:
args[0] 商业银行ID
response 参数:
[{"Name":"XX","TotalNumber":"XX","RestNumber":"XX","ID":"XX"}]
request 参数:
args[0] 企业ID
response 参数:
[{"Name":"XXX","Number":"XX","ID":"XX"}]
request 参数:
args[0] 交易ID
response 参数:
{"FromType":"XX","FromID":"XX","ToType":"XX","ToID":"XX","Time":"XX","Number":"XX","ID":"XX"}
request 参数
CenterBank
response 参数
err nil 为成功
request 参数:
Bank
response 参数:
err nil 为成功
request 参数:
Company
response 参数:
err nil 为成功
request 参数:
Transaction
response 参数:
err nil 为成功
···
#### 其它
查询时为了兼顾读速率,将一些信息备份存放在非区块链数据库上也是一个较好的选择。
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