有没有去中心化购物合约

jc0803kevin 合约开发/区块链开发/项目管理 2020-10-20 15:33

``` pragma solidity >=0.4.22 <0.8.0; contract Mall{ //商品状态 enum ProductStatus { Open, Sold, Unsold } //商品品相 enum ProductCondition { New, Used } struct Product { //商品基本信息 uint id;//商品编号，全局递增 string name;//商品名称 string category;//商品类别 string imageLink; //商品图片链接地址 string descLink; //商品描述链接地址 //拍卖相关信息 uint auctionStartTime; //拍卖开始时间 uint auctionEndTime;//拍卖截止时间 uint startPrice; //价格 address highestBidder; //出最高价者 uint highestBid; //最高出价 uint secondHighestBid;//次高出价 uint totalBids; //投标者人数 //商品状态 ProductStatus status; //商品销售状态：拍卖中、售出、未售 ProductCondition condition; //品相：新品、二手 } //卖家的商品信息 mapping (address => mapping(uint => Product)) stores; mapping (uint => address) productIdInStore; uint private productIndex = 0; //商品上架 function addProductToStore( string memory _name, string memory _category, string memory _imageLink, string memory _descLink, uint _auctionStartTime,uint _auctionEndTime, uint _startPrice, uint _productCondition) public { //拍卖截止时间应当晚于开始时间 require (_auctionStartTime < _auctionEndTime, "拍卖截止时间应当晚于开始时间"); //构造Product结构变量 Product memory product = Product(productIndex, _name, _category, _imageLink,_descLink, _auctionStartTime, _auctionEndTime,_startPrice, address(0), 0, 0, 0, ProductStatus.Open,ProductCondition(_productCondition)); //存入商品目录表 stores[msg.sender][productIndex] = product; //保存商品反查表 productIdInStore[productIndex] = msg.sender; //商品编号计数器递增 productIndex += 1; } //查看商品信息 function getProduct(uint _productId) view public returns (uint, string memory, string memory, string memory, string memory, uint,uint, uint, ProductStatus, ProductCondition) { //利用商品编号提取商品信息 Product memory product = stores[productIdInStore[_productId]][_productId]; return (product.id, product.name, product.category, product.imageLink, product.descLink, product.auctionStartTime,product.auctionEndTime, product.startPrice, product.status, product.condition); } } ```