Function ExWriteDataDBFunc

src/vm/luavm/lmylib.cpp:1341–1374

*bool WriteDataDB(const void* const key,const uint8_t keylen,const void * const value,const uint16_t valuelen,const uint32_t time) * 这个函数式从中间层传了三个个参数过来: * 1.第一个是 key值 * 2.第二个是value值 */

 * 2.第二个是value值
 */
int32_t ExWriteDataDBFunc(lua_State *L) {
    vector<std::shared_ptr < vector<uint8_t> > > retdata;
    if (!GetDataTableWriteDataDB(L, retdata) || retdata.size() != 2) {
        return RetFalse("ExWriteDataDBFunc key err1");
    }

    string key((*retdata.at(0)).begin(), (*retdata.at(0)).end());
    string value((*retdata.at(1)).begin(), (*retdata.at(1)).end());

    CLuaVMRunEnv* pVmRunEnv = GetVmRunEnv(L);
    if (nullptr == pVmRunEnv) {

        return RetFalse("pVmRunEnv is nullptr");
    }

    const CRegID contractRegId = pVmRunEnv->GetContractRegID();
    bool flag = true;
    CContractDBCache* scriptDB = pVmRunEnv->GetScriptDB();
    string oldValue;
    // TODO: get old data when set data ??
    scriptDB->GetContractData(contractRegId, key, oldValue);
    if (!scriptDB->SetContractData(contractRegId, key, value)) {
        LogPrint(BCLog::LUAVM, "ExWriteDataDBFunc SetContractData failed, key:%s!\n",HexStr(key));
        lua_BurnStoreUnchanged(L, key.size(), value.size(), BURN_VER_R2);
        flag = false;
    } else {
        lua_BurnStoreSet(L, key.size(), oldValue.size(), value.size(), BURN_VER_R2);
    }
    #ifdef TRACE_LUAVM_CONTRACT_DATA
        LogPrint(BCLog::LUAVM, "WriteData(), contract_regid=%s, key=%s, key_hex=%s, new_value=%s, new_value_hex=%s\n",
            contractRegId.ToString(), key, HexStr(key), value, HexStr(value));
    #endif//TRACE_LUAVM_CONTRACT_DATA
    return RetRstBooleanToLua(L,flag);
}

/**
 *bool DeleteDataDB(const void* const key,const uint8_t keylen)