test

dbpp::Postgresql::Postgresql(const char *constr) {

    _dbconn = PQconnectdb(constr);

    if (_dbconn == nullptr) {

        // PQconnectdb returns NULL only when libpq could not allocate the

        // connection object. PQstatus()/PQerrorMessage() would dereference the

        // NULL conn and crash, so handle it explicitly.

        throw std::runtime_error("PQconnectdb returned NULL (out of memory)");

    }

    if (PQstatus(_dbconn) != CONNECTION_OK){

        std::string errmsg = PQerrorMessage(_dbconn);

        const char *pqErrMsg = PQerrorMessage(_dbconn);

        std::string errmsg = "Connection to database failed: ";

        if (pqErrMsg) {

            errmsg += pqErrMsg;

        } else {

            errmsg += "Unknown error (PQerrorMessage returned NULL)";

        }

        PQfinish(_dbconn);

        _dbconn = nullptr;

        throw std::runtime_error(errmsg);