MySql connection read error: expected primary-expression before ',' token

[nerkn]

My code is

auto [email, balance] = connection("select email, balance from users limit 1 ").read<std::string, int>();

And I got error :

      /source/hello.cc: In lambda function:
      /source/hello.cc:11:101: error: expected primary-expression before ',' token
         11 |     auto [email, balance] = connection("select balance, email from users limit 1 ").read<std::string, int>();
            |                                                                                                     ^
      /source/hello.cc:11:101: error: expected ';' before ',' token

db variable created using

auto db = mysql_database(
  s::host = "127.0.0.1", // Hostname or ip of the database server
  s::database = "wp97",  // Database name

passed to the function createWeb

createWeb(auth, my_api, db);

and in this function I get "connection " then in the lambda function I try to read values :

void createWeb(auto &auth, li::http_api &api, auto &db){
  auto connection = db.connect();
  api.get("/h") = [&](li::http_request& request, li::http_response& response) {
    auto [email, balance] = connection("select email, balance from users limit 1 ").read<std::string, int>();
    response.write("hello world. "+ email + " " );
  };

and got this error expected primary-expression before ',' token . how can I fix ?