Comment 14 for bug 801700

I've changed some comments and used QMutexLocker instead of mutex.lock where the mutex doesn't get unlocked immediately, this should be easier to maintain over time. TrackDAO::addTracksAdd now checks if the querys exists and
exits with an error message if they are missing.

But I have some questions to the code in BaseTrackCache?

       if (id > 0) {
  QVector<QVariant>& record = m_trackInfo[id];
  record.resize(numColumns);

  for (int i = 0; i < numColumns; ++i) {
   record[i] = getTrackValueForColumn(pTrack, i);
  }
 }

why has record to be resized? Shouldn't it already have the right size?

Other from that it looks good to me. I haven't done any performance measurements but it looks faster to me.

best Max