> For the complete documentation index, see [llms.txt](https://yeasy.gitbook.io/blockchain_guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://yeasy.gitbook.io/blockchain_guide/11_app_dev/chaincode_example05.md).

# 社区能源共享

[chaincode\_example05.go](https://github.com/yeasy/blockchain_guide/blob/master/11_app_dev/chaincode_example05.go) 演示社区能源微网中的家庭账户和电力交易。

## 数据结构

* `Home`：家庭地址、可售电量、余额、状态和模拟密钥；
* `EnergyTransaction`：买方、卖方、交易电量、金额和时间。

## 主要交易函数

* `CreateUser`：创建家庭账户；
* `BuyByAddress`：买方向卖方购买指定电量；
* `ChangeStatus`：账户所有者修改是否可交易；
* `GetHomeByAddress`、`GetHomes`、`GetTransactionByID`、`GetTransactions`：读取状态。

交易逻辑会检查买方签名、卖方交易状态、卖方电量和买方余额。交易时间使用 Fabric 交易时间戳。

> 与 [学历认证示例](/blockchain_guide/11_app_dev/chaincode_example04.md) 一样，本例使用派生字符串模拟签名验证，仅保留业务流程骨架。真实系统中应由客户端身份、证书和密码学库完成签名与验签。


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