aboutsummaryrefslogblamecommitdiffstats
path: root/us_maker_edition/src/base/UDataBase.pas
blob: cccedc6904b7adc5101e3d013718e9bc53a142e9 (plain) (tree)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720















































































































































































































































































































































































































































































































































































































































































































































                                                                                                                        
{* UltraStar Deluxe - Karaoke Game
 *
 * UltraStar Deluxe is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING. If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *}

unit UDataBase;

interface

{$IFDEF FPC}
  {$MODE Delphi}
{$ENDIF}

{$I switches.inc}

uses
  Classes,
  SQLiteTable3,
  UPath,
  USong,
  USongs,
  UTextEncoding;

//--------------------
//DataBaseSystem - Class including all DB methods
//--------------------
type
  TStatType = (
    stBestScores,   // Best scores
    stBestSingers,  // Best singers
    stMostSungSong, // Most sung songs
    stMostPopBand   // Most popular band
  );

  // abstract super-class for statistic results
  TStatResult = class
    public
      Typ: TStatType;
  end;

  TStatResultBestScores = class(TStatResult)
    public
      Singer:       UTF8String;
      Score:        word;
      Difficulty:   byte;
      SongArtist:   UTF8String;
      SongTitle:    UTF8String;
      Date:         UTF8String;
  end;

  TStatResultBestSingers = class(TStatResult)
    public
      Player:       UTF8String;
      AverageScore: word;
  end;

  TStatResultMostSungSong = class(TStatResult)
    public
      Artist:       UTF8String;
      Title:        UTF8String;
      TimesSung:    word;
  end;

  TStatResultMostPopBand = class(TStatResult)
    public
      ArtistName:   UTF8String;
      TimesSungTot: word;
  end;


  TDataBaseSystem = class
    private
      ScoreDB:      TSQLiteDatabase;
      fFilename: IPath;

      function GetVersion(): integer;
      procedure SetVersion(Version: integer);
    public
      property Filename: IPath read fFilename;

      destructor Destroy; override;

      procedure Init(const Filename: IPath);
      procedure ConvertFrom101To110();
      procedure ReadScore(Song: TSong);
      procedure AddScore(Song: TSong; Level: integer; const Name: UTF8String; Score: integer);
      procedure WriteScore(Song: TSong);

      function GetStats(Typ: TStatType; Count: byte; Page: cardinal; Reversed: boolean): TList;
      procedure FreeStats(StatList: TList);
      function GetTotalEntrys(Typ: TStatType): cardinal;
      function GetStatReset: TDateTime;
      function FormatDate(time_stamp: integer): UTF8String;
  end;

var
  DataBase: TDataBaseSystem;

implementation

uses
  DateUtils,
  ULanguage,
  StrUtils,
  SysUtils,
  ULog;

{
 cDBVersion - history
 0 = USDX 1.01 or no Database
 01 = USDX 1.1
}
const
  cDBVersion = 01; // 0.1
  cUS_Scores = 'us_scores';
  cUS_Songs  = 'us_songs';
  cUS_Statistics_Info = 'us_statistics_info';

(**
 * Open database and create tables if they do not exist
 *)
procedure TDataBaseSystem.Init(const Filename: IPath);
var
  Version:            integer;
  finalizeConversion: boolean;
begin
  if Assigned(ScoreDB) then
    Exit;

  Log.LogStatus('Initializing database: "' + Filename.ToNative + '"', 'TDataBaseSystem.Init');

  try

    // open database
    ScoreDB   := TSQLiteDatabase.Create(Filename.ToUTF8);
    fFilename := Filename;

    Version := GetVersion();

    // add Table cUS_Statistics_Info
    // needed in the conversion from 1.01 to 1.1
    if not ScoreDB.TableExists(cUS_Statistics_Info) then
    begin
      Log.LogInfo('Outdated song database found - missing table"' + cUS_Statistics_Info + '"', 'TDataBaseSystem.Init');
      ScoreDB.ExecSQL('CREATE TABLE IF NOT EXISTS [' + cUS_Statistics_Info + '] (' +
                      '[ResetTime] INTEGER' +
                      ');');
      // insert creation timestamp
      ScoreDB.ExecSQL(Format('INSERT INTO [' + cUS_Statistics_Info + '] ' +
                             '([ResetTime]) VALUES(%d);',
                             [DateTimeToUnix(Now())]));
    end;

    // convert data from 1.01 to 1.1
    // part #1 - prearrangement
    finalizeConversion := false;
    if (Version = 0) AND ScoreDB.TableExists('US_Scores') then
    begin
      // rename old tables - to be able to insert new table structures
      ScoreDB.ExecSQL('ALTER TABLE US_Scores RENAME TO us_scores_101;');
      ScoreDB.ExecSQL('ALTER TABLE US_Songs RENAME TO us_songs_101;');
      finalizeConversion := true; // means: conversion has to be done!
    end;

    // Set version number after creation
    if (Version = 0) then
      SetVersion(cDBVersion);

    // SQLite does not handle VARCHAR(n) or INT(n) as expected.
    // Texts do not have a restricted length, no matter which type is used,
    // so use the native TEXT type. INT(n) is always INTEGER.
    // In addition, SQLiteTable3 will fail if other types than the native SQLite
    // types are used (especially FieldAsInteger). Also take care to write the
    // types in upper-case letters although SQLite does not care about this -
    // SQLiteTable3 is very sensitive in this regard.
    ScoreDB.ExecSQL('CREATE TABLE IF NOT EXISTS [' + cUS_Scores + '] (' +
                      '[SongID] INTEGER NOT NULL, ' +
                      '[Difficulty] INTEGER NOT NULL, ' +
                      '[Player] TEXT NOT NULL, ' +
                      '[Score] INTEGER NOT NULL, ' +
                      '[Date] INTEGER NULL' +
                    ');');

    ScoreDB.ExecSQL('CREATE TABLE IF NOT EXISTS [' + cUS_Songs + '] (' +
                      '[ID] INTEGER PRIMARY KEY, ' +
                      '[Artist] TEXT NOT NULL, ' +
                      '[Title] TEXT NOT NULL, ' +
                      '[TimesPlayed] INTEGER NOT NULL, ' +
                      '[Rating] INTEGER NULL' +
                    ');');

    //add column date to cUS-Scores
    if not ScoreDB.ContainsColumn(cUS_Scores, 'Date') then
    begin
      Log.LogInfo('adding column date to "' + cUS_Scores + '"', 'TDataBaseSystem.Init');
      ScoreDB.ExecSQL('ALTER TABLE ' + cUS_Scores + ' ADD COLUMN [Date] INTEGER NULL');
    end;

    // add column rating to cUS_Songs
    // just for users of nightly builds and developers!
    if not ScoreDB.ContainsColumn(cUS_Songs, 'Rating') then
    begin
      Log.LogInfo('Outdated song database found - adding column rating to "' + cUS_Songs + '"', 'TDataBaseSystem.Init');
      ScoreDB.ExecSQL('ALTER TABLE ' + cUS_Songs + ' ADD COLUMN [Rating] INTEGER NULL');
    end;

    // convert data from previous versions
    // part #2 - accomplishment
    if finalizeConversion then
    begin
      //convert data from 1.01 to 1.1
      if ScoreDB.TableExists('us_scores_101') then
        ConvertFrom101To110();
    end;

  except
    on E: Exception do
    begin
      Log.LogError(E.Message, 'TDataBaseSystem.Init');
      FreeAndNil(ScoreDB);
    end;
  end;

end;

(**
 * Convert Database from 1.01 to 1.1
 *)
procedure TDataBaseSystem.ConvertFrom101To110();
var
  TableData:      TSQLiteUniTable;
  tempUTF8String: UTF8String;
begin
  if not ScoreDB.ContainsColumn('us_scores_101', 'Date') then
  begin
    Log.LogInfo(
      'Outdated song database found - ' +
      'begin conversion from V1.01 to V1.1', 'TDataBaseSystem.Convert101To110');

    // insert old values into new db-schemes (/tables)
    ScoreDB.ExecSQL(
      'INSERT INTO ' + cUS_Scores +
      ' SELECT  SongID, Difficulty, Player, Score FROM us_scores_101;');
  end else
  begin
    Log.LogInfo(
      'Outdated song database  found - ' +
      'begin conversion from V1.01 Challenge Mod to V1.1', 'TDataBaseSystem.Convert101To110');

    // insert old values into new db-schemes (/tables)
    ScoreDB.ExecSQL(
      'INSERT INTO ' + cUS_Scores +
      ' SELECT  SongID, Difficulty, Player, Score, Date FROM us_scores_101;');
  end;

    ScoreDB.ExecSQL(
      'INSERT INTO ' + cUS_Songs +
      ' SELECT  ID, Artist, Title, TimesPlayed, ''NULL'' FROM us_songs_101;');

    // now we have to convert all the texts for unicode support:

    // player names
    TableData := nil;
    try
      TableData := ScoreDB.GetUniTable(
        'SELECT [rowid], [Player] ' +
        'FROM [' + cUS_Scores + '];');

      // Go through all Entrys
      while (not TableData.EOF) do
      begin
        // Convert name into UTF8 and alter all entrys
        DecodeStringUTF8(TableData.FieldByName['Player'], tempUTF8String, encCP1252);
        ScoreDB.ExecSQL(
          'UPDATE [' + cUS_Scores + '] ' +
          'SET [Player] = ? ' +
          'WHERE [rowid] = ? ',
          [tempUTF8String,
          TableData.FieldAsInteger(TableData.FieldIndex['rowid'])]);

        TableData.Next;
      end; // while

    except
      on E: Exception do
        Log.LogError(E.Message, 'TDataBaseSystem.Convert101To110');
    end;

    TableData.Free;

    // song artist and song title
    TableData := nil;
    try
      TableData := ScoreDB.GetUniTable(
        'SELECT [ID], [Artist], [Title] ' +
        'FROM [' + cUS_Songs + '];');

      // Go through all Entrys
      while (not TableData.EOF) do
      begin
        // Convert Artist into UTF8 and alter all entrys
        DecodeStringUTF8(TableData.FieldByName['Artist'], tempUTF8String, encCP1252);
        //Log.LogError(TableData.FieldByName['Artist']+' -> '+tempUTF8String+' (encCP1252)');
        ScoreDB.ExecSQL(
          'UPDATE [' + cUS_Songs + '] ' +
          'SET [Artist] = ? ' +
          'WHERE [ID] = ?',
          [tempUTF8String,
          TableData.FieldAsInteger(TableData.FieldIndex['ID'])]);

        // Convert Title into UTF8 and alter all entrys
        DecodeStringUTF8(TableData.FieldByName['Title'], tempUTF8String, encCP1252);
        ScoreDB.ExecSQL(
          'UPDATE [' + cUS_Songs + '] ' +
          'SET [Title] = ? ' +
          'WHERE [ID] = ? ',
          [tempUTF8String,
          TableData.FieldAsInteger(TableData.FieldIndex['ID'])]);

        TableData.Next;
      end; // while

    except
      on E: Exception do
        Log.LogError(E.Message, 'TDataBaseSystem.Convert101To110');
    end;

    TableData.Free;

    //now drop old tables
    ScoreDB.ExecSQL('DROP TABLE us_scores_101;');
    ScoreDB.ExecSQL('DROP TABLE us_songs_101;');
end;

(**
 * Frees Database
 *)
destructor TDataBaseSystem.Destroy;
begin
  Log.LogInfo('TDataBaseSystem.Free', 'TDataBaseSystem.Destroy');
  ScoreDB.Free;
  inherited;
end;

(**
 * Format a UNIX-Timestamp into DATE (If 0 then '')
 *)
function TDataBaseSystem.FormatDate(time_stamp: integer): UTF8String;
var
  Year, Month, Day: word;
begin
  Result:='';
  try
    if time_stamp<>0 then
    begin
      DecodeDate(UnixToDateTime(time_stamp), Year, Month, Day);
      Result := Format(Language.Translate('STAT_FORMAT_DATE'), [Day, Month, Year]);
    end;
  except
    on E: EConvertError do
    Log.LogError('Error Parsing FormatString "STAT_FORMAT_DATE": ' + E.Message);
  end;
end;


(**
 * Read Scores into SongArray
 *)
procedure TDataBaseSystem.ReadScore(Song: TSong);
var
  TableData:  TSQLiteUniTable;
  Difficulty: integer;
  I: integer;
  PlayerListed: boolean;
begin
  if not Assigned(ScoreDB) then
    Exit;

  TableData := nil;
  try
    // Search Song in DB
    TableData := ScoreDB.GetUniTable(
      'SELECT [Difficulty], [Player], [Score], [Date] FROM [' + cUS_Scores + '] ' +
      'WHERE [SongID] = (' +
        'SELECT [ID] FROM [' + cUS_Songs + '] ' +
        'WHERE [Artist] = ? AND [Title] = ? ' +
        'LIMIT 1) ' +
      'ORDER BY [Score] DESC;', //no LIMIT! see filter below!
      [Song.Artist, Song.Title]);

    // Empty Old Scores
    SetLength(Song.Score[0], 0); //easy
    SetLength(Song.Score[1], 0); //medium
    SetLength(Song.Score[2], 0); //hard

    // Go through all Entrys
    while (not TableData.EOF) do
    begin
      // Add one Entry to Array
      Difficulty := TableData.FieldAsInteger(TableData.FieldIndex['Difficulty']);
      if ((Difficulty >= 0) and (Difficulty <= 2)) and
         (Length(Song.Score[Difficulty]) < 5) then
      begin
        //filter player
        PlayerListed:=false;
        if (Length(Song.Score[Difficulty])>0) then
        begin
          for I := 0 to Length(Song.Score[Difficulty]) - 1 do
          begin
            if (Song.Score[Difficulty, I].Name = TableData.FieldByName['Player']) then
            begin
              PlayerListed:=true;
              break;
            end;
          end;
        end;

        if not PlayerListed then
        begin
          SetLength(Song.Score[Difficulty], Length(Song.Score[Difficulty]) + 1);

          Song.Score[Difficulty, High(Song.Score[Difficulty])].Name  :=
            TableData.FieldByName['Player'];
          Song.Score[Difficulty, High(Song.Score[Difficulty])].Score :=
            TableData.FieldAsInteger(TableData.FieldIndex['Score']);
          Song.Score[Difficulty, High(Song.Score[Difficulty])].Date :=
            FormatDate(TableData.FieldAsInteger(TableData.FieldIndex['Date']));
        end;
      end;

      TableData.Next;
    end; // while

  except
    for Difficulty := 0 to 2 do
    begin
      SetLength(Song.Score[Difficulty], 1);
      Song.Score[Difficulty, 1].Name := 'Error Reading ScoreDB';
    end;
  end;

  TableData.Free;
end;

(**
 * Adds one new score to DB
 *)
procedure TDataBaseSystem.AddScore(Song: TSong; Level: integer; const Name: UTF8String; Score: integer);
var
  ID:        integer;
  TableData: TSQLiteTable;
begin
  if not Assigned(ScoreDB) then
    Exit;

  // Prevent 0 Scores from being added EDIT: ==> UScreenTop5.pas!
  //if (Score <= 0) then
  //  Exit;

  TableData := nil;

  try

    ID := ScoreDB.GetTableValue(
        'SELECT [ID] FROM [' + cUS_Songs + '] ' +
        'WHERE [Artist] = ? AND [Title] = ?',
        [Song.Artist, Song.Title]);
    if (ID = 0) then
    begin
      // Create song if it does not exist
      ScoreDB.ExecSQL(
          'INSERT INTO [' + cUS_Songs + '] ' +
          '([ID], [Artist], [Title], [TimesPlayed]) VALUES ' +
          '(NULL, ?, ?, 0);',
          [Song.Artist, Song.Title]);
      // Get song-ID
      ID := ScoreDB.GetLastInsertRowID();
    end;
    // Create new entry
    ScoreDB.ExecSQL(
      'INSERT INTO [' + cUS_Scores + '] ' +
      '([SongID] ,[Difficulty], [Player], [Score], [Date]) VALUES ' +
      '(?, ?, ?, ?, ?);',
      [ID, Level, Name, Score, DateTimeToUnix(Now())]);

  except on E: Exception do
    Log.LogError(E.Message, 'TDataBaseSystem.AddScore');
  end;

  TableData.Free;
end;

(**
 * Not needed with new system.
 * Used to increment played count
 *)
procedure TDataBaseSystem.WriteScore(Song: TSong);
begin
  if not Assigned(ScoreDB) then
    Exit;

  try
    // Increase TimesPlayed
    ScoreDB.ExecSQL(
        'UPDATE [' + cUS_Songs + '] ' +
        'SET [TimesPlayed] = [TimesPlayed] + 1 ' +
        'WHERE [Title] = ? AND [Artist] = ?;',
        [Song.Title, Song.Artist]);
  except on E: Exception do
    Log.LogError(E.Message, 'TDataBaseSystem.WriteScore');
  end;
end;

(**
 * Writes some stats to array.
 * Returns nil if the database is not ready or a list with zero or more statistic
 * entries.
 * Free the result-list with FreeStats() after usage to avoid memory leaks.
 *)
function TDataBaseSystem.GetStats(Typ: TStatType; Count: byte; Page: cardinal; Reversed: boolean): TList;
var
  Query:     string;
  TableData: TSQLiteUniTable;
  Stat:      TStatResult;
begin
  Result := nil;

  if not Assigned(ScoreDB) then
    Exit;

  {Todo:  Add Prevention that only players with more than 5 scores are selected at type 2}

  // Create query
  case Typ of
    stBestScores: begin
      Query := 'SELECT [Player], [Difficulty], [Score], [Artist], [Title], [Date] FROM [' + cUS_Scores + '] ' +
               'INNER JOIN [' + cUS_Songs + '] ON ([SongID] = [ID]) ORDER BY [Score]';
    end;
    stBestSingers: begin
      Query := 'SELECT [Player], ROUND(AVG([Score])) FROM [' + cUS_Scores + '] ' +
               'GROUP BY [Player] ORDER BY AVG([Score])';
    end;
    stMostSungSong: begin
      Query := 'SELECT [Artist], [Title], [TimesPlayed] FROM [' + cUS_Songs + '] ' +
               'ORDER BY [TimesPlayed]';
    end;
    stMostPopBand: begin
      Query := 'SELECT [Artist], SUM([TimesPlayed]) FROM [' + cUS_Songs + '] ' +
               'GROUP BY [Artist] ORDER BY SUM([TimesPlayed])';
    end;
  end;

  // Add order direction
  Query := Query + IfThen(Reversed, ' ASC', ' DESC');

  // Add limit
  Query := Query + ' LIMIT ' + InttoStr(Count * Page) + ', ' + InttoStr(Count) + ';';

  // Execute query
  try
    TableData := ScoreDB.GetUniTable(Query);
  except
    on E: Exception do
    begin
      Log.LogError(E.Message, 'TDataBaseSystem.GetStats');
      Exit;
    end;
  end;

  Result := TList.Create;
  Stat := nil;

  // Copy result to stats array
  while not TableData.EOF do
  begin
    case Typ of
      stBestScores: begin
        Stat := TStatResultBestScores.Create;
        with TStatResultBestScores(Stat) do
        begin
          Singer := TableData.Fields[0];
          Difficulty := TableData.FieldAsInteger(1);
          Score := TableData.FieldAsInteger(2);
          SongArtist := TableData.Fields[3];
          SongTitle := TableData.Fields[4];
          Date := FormatDate(TableData.FieldAsInteger(5));
        end;
      end;
      stBestSingers: begin
        Stat := TStatResultBestSingers.Create;
        with TStatResultBestSingers(Stat) do
        begin
          Player := TableData.Fields[0];
          AverageScore := TableData.FieldAsInteger(1);
        end;
      end;
      stMostSungSong: begin
        Stat := TStatResultMostSungSong.Create;
        with TStatResultMostSungSong(Stat) do
        begin
          Artist := TableData.Fields[0];
          Title  := TableData.Fields[1];
          TimesSung  := TableData.FieldAsInteger(2);
        end;
      end;
      stMostPopBand: begin
        Stat := TStatResultMostPopBand.Create;
        with TStatResultMostPopBand(Stat) do
        begin
          ArtistName := TableData.Fields[0];
          TimesSungTot := TableData.FieldAsInteger(1);
        end;
      end
      else
        Log.LogCritical('Unknown stat-type', 'TDataBaseSystem.GetStats');
    end;

    Stat.Typ := Typ;
    Result.Add(Stat);

    TableData.Next;
  end;

  TableData.Free;
end;

procedure TDataBaseSystem.FreeStats(StatList: TList);
var
  Index: integer;
begin
  if (StatList = nil) then
    Exit;
  for Index := 0 to StatList.Count-1 do
    TStatResult(StatList[Index]).Free;
  StatList.Free;
end;

(**
 * Gets total number of entrys for a stats query
 *)
function TDataBaseSystem.GetTotalEntrys(Typ: TStatType): cardinal;
var
  Query: string;
begin
  Result := 0;

  if not Assigned(ScoreDB) then
    Exit;

  try
    // Create query
    case Typ of
      stBestScores:
        Query := 'SELECT COUNT([SongID]) FROM [' + cUS_Scores + '];';
      stBestSingers:
        Query := 'SELECT COUNT(DISTINCT [Player]) FROM [' + cUS_Scores + '];';
      stMostSungSong:
        Query := 'SELECT COUNT([ID]) FROM [' + cUS_Songs + '];';
      stMostPopBand:
        Query := 'SELECT COUNT(DISTINCT [Artist]) FROM [' + cUS_Songs + '];';
    end;

    Result := ScoreDB.GetTableValue(Query);
  except on E: Exception do
    Log.LogError(E.Message, 'TDataBaseSystem.GetTotalEntrys');
  end;

end;

(**
 * Gets reset date of statistic data
 *)
function TDataBaseSystem.GetStatReset: TDateTime;
var
  Query: string;
begin
  Result := 0;

  if not Assigned(ScoreDB) then
    Exit;

  try
    Query := 'SELECT [ResetTime] FROM [' + cUS_Statistics_Info + '];';
    Result := UnixToDateTime(ScoreDB.GetTableValue(Query));
  except on E: Exception do
    Log.LogError(E.Message, 'TDataBaseSystem.GetStatReset');
  end;
end;

function TDataBaseSystem.GetVersion(): integer;
begin
  Result := ScoreDB.GetTableValue('PRAGMA user_version');
end;

procedure TDataBaseSystem.SetVersion(Version: integer);
begin
  ScoreDB.ExecSQL(Format('PRAGMA user_version = %d', [Version]));
end;

end.