+class Tournament {
+public:
+ int id;
+ std::string name;
+};
+
+Tournament tourn;
+
+/* A trigger that sets a flag whenever it's trigged. */
+class FlagTrigger : pqxx::trigger {
+private:
+ bool flag;
+
+public:
+ FlagTrigger(pqxx::connection_base &conn, const PGSTD::string &name)
+ : pqxx::trigger(conn, name), flag(false) {}
+ virtual ~FlagTrigger() throw () {}
+
+ virtual void operator() (int pid)
+ {
+ flag = true;
+ std::fprintf(stderr, "Received a flag trigger from pid %u\n", pid);
+ }
+
+ bool get_flag() const
+ {
+ return flag;
+ }
+
+ void reset_flag()
+ {
+ flag = false;
+ }
+};
+
+/* A transactor that fetches the current tournament and some information about it. */
+class FetchCurrentTournament : public pqxx::transactor<> {
+private:
+ Tournament *tourn;
+
+public:
+ FetchCurrentTournament(Tournament *tourn) : tourn(tourn) {}
+ void operator() (pqxx::transaction<> &t)
+ {
+ pqxx::result res( t.exec("SELECT * FROM bigscreen.active_tournament NATURAL JOIN tournaments") );
+ try {
+ pqxx::result::tuple tournament = res.at(0);
+
+ tourn->id = tournament["tournament"].as(tourn->id);
+ tourn->name = tournament["tournamentname"].as(tourn->name);
+ } catch (PGSTD::out_of_range &e) {
+ tourn->id = -1;
+ tourn->name = "";
+ }
+ }
+};
+
+void init(pqxx::connection &conn)
+{
+ conn.perform(FetchCurrentTournament(&tourn));
+
+ if (tourn.id == -1) {
+ std::fprintf(stderr, "No active tournament\n");
+ } else {
+ std::fprintf(stderr, "Current tournament is %d (name: '%s')\n",
+ tourn.id, tourn.name.c_str());
+ }
+}
+
+void main_loop(pqxx::connection &conn)
+{
+ if (tourn.id == -1) {
+ // No active tournament, sleep a second or so and exit
+ sleep(1);
+ return;
+ }
+
+ pqxx::work t(conn, "trx");
+
+ // fetch all songs
+ pqxx::result res( t.exec("SELECT * FROM songs") );
+ for (pqxx::result::const_iterator i = res.begin(); i != res.end(); ++i) {
+ std::fprintf(stderr, "%s\n", i["title"].c_str());
+ }
+ t.commit();
+
+ sleep(1);
+}
+