virtual bool get_next_row(RowT& result) {
if (advance()) {
if (sample_.payload.type == aku_PData::EMPTY) {
aku_cursor_close(cursor_);
cursor_ = nullptr;
return false;
}
const int buffer_size = AKU_LIMITS_MAX_SNAME;
char buffer[buffer_size];
// Convert id
auto len = aku_param_id_to_series(db_, sample_.paramid, buffer, buffer_size);
if (len <= 0) {
std::runtime_error err("no such id");
BOOST_THROW_EXCEPTION(err);
}
std::string paramid(buffer, buffer + len - 1);
std::string timestamp;
if (sample_.payload.type & aku_PData::TIMESTAMP_BIT) {
// Convert timestamp
len = aku_timestamp_to_string(sample_.timestamp, buffer, buffer_size);
if (len <= 0) {
std::runtime_error err("bad timestamp");
BOOST_THROW_EXCEPTION(err);
}
timestamp = std::string(buffer, buffer + len - 1);
}
// Convert payload
if (sample_.payload.type & aku_PData::FLOAT_BIT) {
result = { timestamp, paramid, sample_.payload.float64, sample_.paramid, sample_.timestamp };
} else {
result = { std::string(), paramid, NAN, sample_.paramid, sample_.timestamp };
}
return true;
}
return false;
}
int AkumuliConnection::param_id_to_series(aku_ParamId id, char* buffer, size_t buffer_size) {
return aku_param_id_to_series(db_, id, buffer, buffer_size);
}