前言：
上一章节，我们已经配置了webase,并且写了一个HW的合约，能够正常的和区块链底层交互。这个章节我们来写我们的博客留言的智能合约代码。
正文：
第一章节我们就分析了需要上链的摘要信息如下：
sid 被评论的文章或者页面的ID
nickname 评论人的昵称
content 评论的内容
合约代码如下：
pragma solidity>=0.4.24 <0.6.11;
import "./Table.sol";
contract CommentService {
event SetResult(int256 count);
KVTableFactory tableFactory;
string constant TABLE_NAME = "t_comment";
constructor() public {
//The fixed address is 0x1010 for KVTableFactory
tableFactory = KVTableFactory(0x1010);
// the parameters of createTable are tableName,keyField,"vlaueFiled1,vlaueFiled2,vlaueFiled3,..."
tableFactory.createTable(TABLE_NAME, "id", "sid,nickname,content");
}
// 获取链上的信息
function get(string memory id) public view returns (bool, int256, string memory,string memory) {
KVTable table = tableFactory.openTable(TABLE_NAME);
bool ok = false;
Entry entry;
(ok, entry) = table.get(id);
int256 sid;
string memory nickname;
string memory content;
if (ok) {
sid= entry.getInt("sid");
nickname = entry.getString("nickname");
content = entry.getString("content");
}
return (ok, sid, nickname,content);
}
// 评论的摘要信息上链
function set(string memory id, int256 sid, string memory nickname,string memory content)
public
returns (int256)
{
KVTable table = tableFactory.openTable(TABLE_NAME);
Entry entry = table.newEntry();
// the length of entry's field value should < 16MB
entry.set("id", id);
entry.set("sid", sid);
entry.set("nickname", nickname);
entry.set("content", content);
// the first parameter length of set should <= 255B
int256 count = table.set(id, entry);
emit SetResult(count);
return count;
}
}
官方的Table.sol
contract TableFactory {
function openTable(string memory) public view returns (Table) {} //open table
function createTable(string memory, string memory, string memory) public returns (int256) {} //create table
}
//select condition
contract Condition {
function EQ(string memory, int256) public {}
function EQ(string memory, string memory) public {}
function NE(string memory, int256) public {}
function NE(string memory, string memory) public {}
function GT(string memory, int256) public {}
function GE(string memory, int256) public {}
function LT(string memory, int256) public {}
function LE(string memory, int256) public {}
function limit(int256) public {}
function limit(int256, int256) public {}
}
//one record
contract Entry {
function getInt(string memory) public view returns (int256) {}
function getUInt(string memory) public view returns (int256) {}
function getAddress(string memory) public view returns (address) {}
function getBytes64(string memory) public view returns (bytes1[64] memory) {}
function getBytes32(string memory) public view returns (bytes32) {}
function getString(string memory) public view returns (string memory) {}
function set(string memory, int256) public {}
function set(string memory, uint256) public {}
function set(string memory, string memory) public {}
function set(string memory, address) public {}
}
//record sets
contract Entries {
function get(int256) public view returns (Entry) {}
function size() public view returns (int256) {}
}
//Table main contract
contract Table {
function select(string memory, Condition) public view returns (Entries) {}
function insert(string memory, Entry) public returns (int256) {}
function update(string memory, Entry, Condition) public returns (int256) {}
function remove(string memory, Condition) public returns (int256) {}
function newEntry() public view returns (Entry) {}
function newCondition() public view returns (Condition) {}
}
contract KVTableFactory {
function openTable(string memory) public view returns (KVTable) {}
function createTable(string memory, string memory, string memory) public returns (int256) {}
}
//KVTable per permiary key has only one Entry
contract KVTable {
function get(string memory) public view returns (bool, Entry) {}
function set(string memory, Entry) public returns (int256) {}
function newEntry() public view returns (Entry) {}
}
我们测试一下：
写数据
读数据
都正常
我们选择用rest api来调用合约上链，如果是正式项目，建议用官方的sdk来调用合约，和大佬交流大佬说sdk效率更高。
官方文档如下：
接口URL
http://localhost:5002/WeBASE-Front/trans/handleWithSign
调用方法
HTTP POST
请求参数
1）参数表
| 序号 |
中文 |
参数名 |
类型 |
最大长度 |
必填 |
说明 |
| 1 |
用户编号 |
signUserId |
String |
64 |
是 |
WeBASE-Sign用户编号（查询方法可不传） |
| 2 |
合约名称 |
contractName |
String |
是 |
||
| 3 |
合约地址 |
contractAddress |
String |
是 |
||
| 4 |
方法名 |
funcName |
String |
是 |
||
| 5 |
合约编译后生成的abi文件内容 |
contractAbi |
List |
是 |
合约中单个函数的ABI，若不存在同名函数可以传入整个合约ABI，格式：JSONArray |
|
| 6 |
方法参数 |
funcParam |
List |
否 |
JSON数组，多个参数以逗号分隔（参数为数组时同理），如：["str1",["arr1","arr2"]] |
|
| 7 |
群组ID |
groupId |
int |
是 |
默认为1 |
|
| 8 |
合约版本 |
version |
String |
否 |
CNS中合约版本，该字段在v1.3.0+版本已弃用 |
2）数据格式
{ "groupId" :1, "signUserId": "458ecc77a08c486087a3dcbc7ab5a9c3", "contractAbi":[{"constant":true,"inputs":[],"name":"getVersion","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getStorageCell","outputs":[{"name":"","type":"string"},{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"n","type":"string"}],"name":"setVersion","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[{"name":"storageHash","type":"string"},{"name":"storageInfo","type":"string"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"}], "contractAddress":"0x14d5af9419bb5f89496678e3e74ce47583f8c166", "funcName":"set", "funcParam":["test"] }
示例：
curl -X POST "http://localhost:5002/WeBASE-Front/trans/handleWithSign" -H "accept: */*" -H "Content-Type: application/json" -d "{ \"contractAbi\": [ { \"outputs\": [], \"constant\": false, \"payable\": false, \"inputs\": [ { \"name\": \"n\", \"type\": \"string\" } ], \"name\": \"set\", \"stateMutability\": \"nonpayable\", \"type\": \"function\" }, { \"outputs\": [ { \"name\": \"\", \"type\": \"string\" } ], \"constant\": true, \"payable\": false, \"inputs\": [], \"name\": \"get\", \"stateMutability\": \"view\", \"type\": \"function\" }, { \"payable\": false, \"inputs\": [], \"stateMutability\": \"nonpayable\", \"type\": \"constructor\" }, { \"inputs\": [ { \"indexed\": false, \"name\": \"name\", \"type\": \"string\" } ], \"name\": \"nameEvent\", \"anonymous\": false, \"type\": \"event\" } ], \"contractAddress\": \"0x7571ff73f1a37ca07f678aebc4d8213e7ef5c266\", \"funcName\": \"set\", \"funcParam\": [ \"test\" ], \"groupId\": 1, \"signUserId\": "458ecc77a08c486087a3dcbc7ab5a9c3"}"
响应参数
a、正确查询交易返回值信息
{"Hi,Welcome!"}
b、正确发送数据上链返回值信息（交易收据）
{ "transactionHash": "0x0b426a58af8ba449742b937f1e9b2b225335638707b93d6b296dfd8107edddd7", "transactionIndex": 0, "blockHash": "0xc8eb7a983ecb8c2a0a64450a059d2cf3de8c8d786211dcec48ab9c47219ee8f7", "blockNumber": 36985, "gasUsed": 35400, "contractAddress": "0x0000000000000000000000000000000000000000", "root": null, "status": "0x0", "from": "0xb173ca9a2e07efe6007aee751a013849d53e7c29", "to": "0x7571ff73f1a37ca07f678aebc4d8213e7ef5c266", "input": "0x4ed3885e000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000047465737400000000000000000000000000000000000000000000000000000000", "output": "0x", "logs": [ { "removed": false, "logIndex": null, "transactionIndex": null, "transactionHash": null, "blockHash": null, "blockNumber": null, "address": "0x7571ff73f1a37ca07f678aebc4d8213e7ef5c266", "data": "0x000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000047465737400000000000000000000000000000000000000000000000000000000", "type": null, "topics": [ "0x9645e7fb5eec05c0f156d4901a10663561199c6dd0401214a0b833fe0022d899" ], "logIndexRaw": null, "blockNumberRaw": null, "transactionIndexRaw": null } ], "logsBloom": "0x00000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000800000000020000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000", "gasUsedRaw": "0x8a48", "statusOK": true, "blockNumberRaw": "0x9079", "transactionIndexRaw": "0x0" }
postman来测试一下，都正常
那么本章节到此结束。