智能合约练习

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.7.0 <0.9.0;
contract CollectionName {
    uint public totalNum;  //收集的信息总数
    uint contractCreationTime; //创建合约时间 构造函数初始化时获取时间
    address  public owner; //存储合约owner
    uint private deadline; //截至日期
    mapping (address => mapping(uint => CollectionSys)) forMessage;
    mapping (uint => address) projectIdInStore;
    mapping(uint256 => CollectionSys[])  getAllData;
   
    //收集中英文信息的结构体
    struct CollectionSys {
        uint id;
        string chineseName;
        string englishName;
        uint timestamp ; //时间戳
        address where;
        string description;
    }
    constructor() public {
        owner=msg.sender;
        totalNum = 0;  //对于填写信息的人进行计数
        contractCreationTime=block.timestamp;
    }
     function setDeadline(uint time) public {
        deadline = time;
    }
     modifier notExpired(){
        require(block.timestamp <= deadline);
        _;
    }
    function service(uint _projectId) public notExpired view returns (uint,uint,string memory,string memory,uint,address,string memory){
        CollectionSys memory CollectionSys = forMessage[projectIdInStore[_projectId]][_projectId];
        return (contractCreationTime,CollectionSys.id, CollectionSys.chineseName, CollectionSys.englishName, CollectionSys.timestamp, CollectionSys.where, CollectionSys.description);
    }
    function getBlockTimestamp() public view returns(uint) {
     // 获取当前块的时间戳
        return block.timestamp;
    }
   
    //添加收集的中英文名称信息上链
    function addProject(string memory _chineseName, string memory _englishName, string memory _description) public {
        totalNum += 1;
        CollectionSys memory CollectionSys = CollectionSys(totalNum, _chineseName, _englishName, getBlockTimestamp(), msg.sender, _description);
        forMessage[msg.sender][totalNum] = CollectionSys;
        projectIdInStore[totalNum] = msg.sender;
        getAllData[1].push(CollectionSys);
    }
    //根据id查询展示链上的数据
    function getProject(uint _projectId) view public returns (uint,uint, string memory, string memory, uint, address , string memory) {
        CollectionSys memory CollectionSys = forMessage[projectIdInStore[_projectId]][_projectId];
        return (contractCreationTime,CollectionSys.id, CollectionSys.chineseName, CollectionSys.englishName, CollectionSys.timestamp, CollectionSys.where, CollectionSys.description);
    }
    function getAll()view public returns(CollectionSys[] memory){
      CollectionSys[] memory allData =getAllData[1];
      return allData;
    }
    // function destoryContract() public {
    //    if (owner == msg.sender) {   // 检查谁在调用
    //       selfdestruct(owner);      // 销毁合约
    //    }
    // }
   
}