Program: 170811
Project: 170811
Buggy source:
/** 
 * 获取缓存数据
 * @param type 类型（新歌，摇滚等）
 * @return 缓存的数据集合
 */
public List<NetSongBean> querySongData(int type){
  SQLiteDatabase db=mTickDaoHelper.getReadableDatabase();
  Cursor cursor=null;
  try {
    cursor=db.query(TickDaoHelper.NET_MUSIC_TABLE,null,NetParam.TYPE + "String_Node_Str",new String[]{String.valueOf(type)},null,null,NetParam.RANK + "String_Node_Str",null);
    if (cursor.getCount() > 0) {
      List<NetSongBean> listBeen=new ArrayList<>();
      while (cursor.moveToNext()) {
        NetSongBean listBean=new NetSongBean();
        listBean.songId=cursor.getString(cursor.getColumnIndex(NetParam.SONG_ID));
        listBean.title=cursor.getString(cursor.getColumnIndex(NetParam.SONG_NAME));
        listBean.artistId=cursor.getString(cursor.getColumnIndex(NetParam.SINGER_ID));
        listBean.artistName=cursor.getString(cursor.getColumnIndex(NetParam.SINGER_NAME));
        listBean.imgUrl=cursor.getString(cursor.getColumnIndex(NetParam.PIC_URL));
        listBean.lrcLink=cursor.getString(cursor.getColumnIndex(NetParam.LRC_LINK));
        listBean.albumId=cursor.getString(cursor.getColumnIndex(NetParam.ALBUM_ID));
        listBean.albumTitle=cursor.getString(cursor.getColumnIndex(NetParam.ALBUM_NAME));
        listBean.rank=cursor.getInt(cursor.getColumnIndex(NetParam.RANK));
        listBeen.add(listBean);
      }
      return listBeen;
    }
  }
 catch (  Exception e) {
    e.printStackTrace();
    return null;
  }
 finally {
    if (cursor != null) {
      cursor.close();
    }
    db.close();
  }
  return null;
}

Fixed version (ground truth):
/** 
 * 获取缓存数据
 * @param type 类型（新歌，摇滚等）
 * @return 缓存的数据集合
 */
public List<NetSongBean> querySongData(int type){
  SQLiteDatabase db=mTickDaoHelper.getReadableDatabase();
  Cursor cursor=null;
  List<NetSongBean> netSongBeans=new ArrayList<>();
  db.beginTransaction();
  try {
    cursor=db.query(TickDaoHelper.NET_MUSIC_TABLE,null,NetParam.TYPE + "String_Node_Str",new String[]{String.valueOf(type)},null,null,NetParam.RANK + "String_Node_Str",null);
    if (cursor.getCount() > 0) {
      List<NetSongBean> listBeen=new ArrayList<>();
      while (cursor.moveToNext()) {
        NetSongBean listBean=new NetSongBean();
        listBean.songId=cursor.getString(cursor.getColumnIndex(NetParam.SONG_ID));
        listBean.title=cursor.getString(cursor.getColumnIndex(NetParam.SONG_NAME));
        listBean.artistId=cursor.getString(cursor.getColumnIndex(NetParam.SINGER_ID));
        listBean.artistName=cursor.getString(cursor.getColumnIndex(NetParam.SINGER_NAME));
        listBean.imgUrl=cursor.getString(cursor.getColumnIndex(NetParam.PIC_URL));
        listBean.lrcLink=cursor.getString(cursor.getColumnIndex(NetParam.LRC_LINK));
        listBean.albumId=cursor.getString(cursor.getColumnIndex(NetParam.ALBUM_ID));
        listBean.albumTitle=cursor.getString(cursor.getColumnIndex(NetParam.ALBUM_NAME));
        listBean.rank=cursor.getInt(cursor.getColumnIndex(NetParam.RANK));
        listBeen.add(listBean);
      }
      netSongBeans=listBeen;
    }
    db.setTransactionSuccessful();
    return netSongBeans;
  }
 catch (  Exception e) {
    e.printStackTrace();
  }
 finally {
    if (cursor != null) {
      cursor.close();
    }
    db.endTransaction();
    db.close();
  }
  return null;
}