#include <eosiolib/eosio.hpp>
#include <string>

using namespace eosio;

using std::string;

class record:public eosio::contract
{

  public:
    // @abi table notes i64;
    struct note
    {
        uint64_t id;
        account_name author;
        string text;

        auto primary_key() const { return id; }
    };

    typedef multi_index<N(notes), note> notes;

    using contract::contract;

    // @abi action
    void write(account_name author, string text)
    {
        require_auth(author);
        print("Hello,", name{author});

        notes nt(_self, _self);

        uint64_t noteId;

        //在表中增加记录
        nt.emplace(author, [&](auto &n) {
            n.id = nt.available_primary_key(); //主键自增
            n.author = author;
            n.text = text;
            noteId = n.id;
        });
        print("----noteId = ", noteId);
    }

    void remove(uint64_t id)
    {
        notes nt(_self, _self);
        auto it = nt.find(id); //查询记录
        eosio_assert(it != nt.end(), "the id not found");
        require_auth(it->author);
        nt.erase(it); //删除一条数据
        　
    }
};

EOSIO_ABI(record, (write)(remove));

可以看到abi里有四种结构 types,structs,actions,tables
我看到很多合约types都是一样的,所以暂时先这样写,不做分析,等官方文档通知
structs可以理解成定义的所有结构,包括转账的transfer结构,account的schema结构;
action对应的是合约的所有事件;
tables对应的是我们所涉及到在区块链上数据的存储,这里账户的信息会存在区块链上