Added a "top 5 chosen songs this tournament" screen.
[ccbs] / bigscreen / fetch_top_chosen_songs_for_tournament.cpp
1 #include "fetch_top_chosen_songs_for_tournament.h"
2
3 // small utility function so we can stick TopChosenSongs in a std::set
4 bool TopChosen::operator< (const TopChosen &other) const
5 {
6         if (title != other.title)
7                 return (title < other.title);
8         return (frequency < other.frequency);
9 }
10
11 FetchTopChosenSongsForTournament::FetchTopChosenSongsForTournament(unsigned tournament, unsigned num, std::vector<TopChosen> *chosen)
12         : tournament(tournament), num(num), chosen(chosen) {}
13         
14 void FetchTopChosenSongsForTournament::operator() (pqxx::transaction<> &t)
15 {
16         chosen->erase(chosen->begin(), chosen->end());
17
18         // Again, this will break if a song has more than one short title
19         pqxx::result res( t.exec(
20                 "SELECT title, shorttitle, COUNT(*) AS frequency FROM scores NATURAL JOIN songs NATURAL LEFT JOIN songshorttitles WHERE tournament="
21                 + pqxx::to_string(tournament) + " AND chosen='t' AND song is NOT NULL GROUP BY title,shorttitle ORDER BY COUNT(*) DESC LIMIT "
22                 + pqxx::to_string(num)) );
23         
24         for (pqxx::result::const_iterator i = res.begin(); i != res.end(); ++i) {
25                 TopChosen ts;
26
27                 ts.title = i["title"].as(ts.title);
28                 ts.shorttitle = i["shorttitle"].as(ts.shorttitle);
29                 ts.frequency = i["frequency"].as(ts.frequency);
30
31                 chosen->push_back(ts);
32         }
33 }