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：
- 初始化中央银行及其发行的货币数量
- 新增商业银行，同时央行并向其发行一定数量的货币
- 新增企业
- 商业银行向企业转给一定数量的数字货币
- 企业之间进行相互的转账
- 查询企业、银行、交易信息
主要函数
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。
数据结构设计
- 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
- bank 商业银行
- Name：名称
- TotalNumber：收到货币总数额
- RestNumber：账户余额
- ID：银行 ID
- company 企业
- Name：名称
- Number：账户余额
- ID：企业 ID
- transaction 交易内容
- 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
接口设计
| 接品名 | request 参数 | response 参数 |
|---|---|---|
| init | args[0] 银行名称 args[1] 初始化发布金额 |
{"Name":"XXX","TotalNumber":"0","RestNumber":"0","ID":"XX"} |
| createBank | args[0] 银行名称 | {"Name":"XXX","TotalNumber":"0","RestNumber":"0","ID":"XX"} |
| createCompany | args[0] 公司名称 | {"Name":"XXX","Number":"0","ID":"XX"} |
| issueCoin | args[0] 再次发行货币数额 | {"FromType":"0","FromID":"0","ToType":"0","ToID":"0","Time":"XX","Number":"XX","ID":"XX"} |
| issueCoinToBank | args[0] 商业银行ID args[1] 转账数额 |
{"FromType":"0","FromID":"0","ToType":"1","ToID":"XX","Time":"XX","Number":"XX","ID":"XX"} |
| issueCoinToCp | args[0] 商业银行ID args[1] 企业ID args[2] 转账数额 |
{"FromType":"1","FromID":"XX","ToType":"2","ToID":"XX","Time":"XX","Number":"XX","ID":"XX"} |
| transfer | args[0] 转账用户ID args[1] 被转账用户ID args[2] 转账余额 |
{"FromType":"2","FromID":"XX","ToType":"2","ToID":"XX","Time":"XX","Number":"XX","ID":"XX"} |
| getBanks | 无 | [{"Name":"XXX","Number":"XX","ID":"XX"},{"Name":"XXX","Number":"XX","ID":"XX"},...] |
| getCompanys | 无 | [{"Name":"XXX","TotalNumber":"XX","RestNumber":"XX","ID":"XX"},{"Name":"XXX","TotalNumber":"XX","RestNumber":"XX","ID":"XX"},...] |
| getTransactions | 无 | [{"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"},...] |
| getCenterBank | 无 | [{"Name":"XX","TotalNumber":"XX","RestNumber":"XX","ID":"XX"}] |
| getBankById | args[0] 商业银行ID | [{"Name":"XX","TotalNumber":"XX","RestNumber":"XX","ID":"XX"}] |
| getCompanyById | args[0] 企业ID | [{"Name":"XXX","Number":"XX","ID":"XX"}] |
| getTransactionById | args[0] 交易ID | {"FromType":"XX","FromID":"XX","ToType":"XX","ToID":"XX","Time":"XX","Number":"XX","ID":"XX"} |
| writeCenterBank | CenterBank | errnil 为成功 |
| writeBank | Bank | errnil 为成功 |
| writeCompany | Company | errnil 为成功 |
| writeTransaction | Transaction | err nil 为成功 |