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Optimize loading channel info by getting rid of nested SELECT statements

This commit is contained in:
Daniel Schulte 2020-11-22 21:31:26 +01:00
parent 87d85c60f3
commit d3028c28b2
1 changed files with 12 additions and 8 deletions
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20
yt.cpp
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@ -228,16 +228,20 @@ void Channel::fetch_new_videos(sqlite3 *db, progress_info *info, std::optional<s
void Channel::load_info(sqlite3 *db)
{
video_count = 0;
unwatched = 0;
sqlite3_stmt *query;
SC(sqlite3_prepare_v2(db, "SELECT "
"(SELECT count(*) FROM videos WHERE channelId = ?1), "
"(SELECT count(*) FROM videos WHERE channelId = ?1 AND flags & ?2 = 0)"
";", -1, &query, nullptr));
SC(sqlite3_prepare_v2(db, "SELECT flags, count(*) as videos FROM videos where channelId = ?1 GROUP by flags;", -1, &query, nullptr));
SC(sqlite3_bind_text(query, 1, id.c_str(), -1, SQLITE_TRANSIENT));
SC(sqlite3_bind_int(query, 2, kWatched));
sqlite3_step(query);
video_count = sqlite3_column_int(query, 0);
unwatched = sqlite3_column_int(query, 1);
while(sqlite3_step(query) == SQLITE_ROW) {
const int flags = sqlite3_column_int(query, 0);
const int count = sqlite3_column_int(query, 1);
video_count += count;
if((flags & kWatched) == 0)
unwatched += count;
}
SC(sqlite3_finalize(query));
}