aboutsummaryrefslogtreecommitdiffstats
path: root/Game/Code/lib/SQLite/SQLiteTable3.pas
blob: cbf868bd9af0b82d27d6837dfd637f5ec99da392 (plain) (blame)
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
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
unit SQLiteTable3;

{
  Simple classes for using SQLite's exec and get_table.

  TSQLiteDatabase wraps the calls to open and close an SQLite database.
  It also wraps SQLite_exec for queries that do not return a result set

  TSQLiteTable wraps sqlite_get_table.
  It allows accessing fields by name as well as index and can step through a
  result set with the Next procedure.

  Adapted by Tim Anderson (tim@itwriting.com)
  Originally created by Pablo Pissanetzky (pablo@myhtpc.net)
  Modified and enhanced by Lukas Gebauer
}

interface

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

{$I switches.inc}

uses
  {$ifdef win32}
  Windows,
  {$endif}
  SQLite3,
  Classes,
  SysUtils;

const

  dtInt = 1;
  dtNumeric = 2;
  dtStr = 3;
  dtBlob = 4;
  dtNull = 5;

type

  ESQLiteException = class(Exception)
  end;

  TSQLiteTable = class;

  TSQLiteDatabase = class
  private
    fDB: TSQLiteDB;
    fInTrans: boolean;
    procedure RaiseError(s: string; SQL: string);
  public
    constructor Create(const FileName: string);
    destructor Destroy; override;
    function GetTable(const SQL: string): TSQLiteTable;
    procedure ExecSQL(const SQL: string);
    function GetTableValue(const SQL: string): int64;
    function GetTableString(const SQL: string): string;
    procedure UpdateBlob(const SQL: string; BlobData: TStream);
    procedure BeginTransaction;
    procedure Commit;
    procedure Rollback;
    function TableExists(TableName: string): boolean;
    function GetLastInsertRowID: int64;
    procedure SetTimeout(Value: integer);
    function version: string;
  published
    property isTransactionOpen: boolean read fInTrans;
  end;

  TSQLiteTable = class
  private
    fResults: TList;
    fRowCount: cardinal;
    fColCount: cardinal;
    fCols: TStringList;
    fColTypes: TList;
    fRow: cardinal;
    function GetFields(I: cardinal): string;
    function GetEOF: boolean;
    function GetBOF: boolean;
    function GetColumns(I: integer): string;
    function GetFieldByName(FieldName: string): string;
    function GetFieldIndex(FieldName: string): integer;
    function GetCount: integer;
    function GetCountResult: integer;
  public
    constructor Create(DB: TSQLiteDatabase; const SQL: string);
    destructor Destroy; override;
    function FieldAsInteger(I: cardinal): int64;
    function FieldAsBlob(I: cardinal): TMemoryStream;
    function FieldAsBlobText(I: cardinal): string;
    function FieldIsNull(I: cardinal): boolean;
    function FieldAsString(I: cardinal): string;
    function FieldAsDouble(I: cardinal): double;
    function Next: boolean;
    function Previous: boolean;
    property EOF: boolean read GetEOF;
    property BOF: boolean read GetBOF;
    property Fields[I: cardinal]: string read GetFields;
    property FieldByName[FieldName: string]: string read GetFieldByName;
    property FieldIndex[FieldName: string]: integer read GetFieldIndex;
    property Columns[I: integer]: string read GetColumns;
    property ColCount: cardinal read fColCount;
    property RowCount: cardinal read fRowCount;
    property Row: cardinal read fRow;
    function MoveFirst: boolean;
    function MoveLast: boolean;
    property Count: integer read GetCount;
    // The property CountResult is used when you execute count(*) queries.
    // It returns 0 if the result set is empty or the value of the
    // first field as an integer.
    property CountResult: integer read GetCountResult;
  end;

procedure DisposePointer(ptr: pointer); cdecl;


implementation

procedure DisposePointer(ptr: pointer); cdecl;
begin
  if assigned(ptr) then
    freemem(ptr);
end;

//------------------------------------------------------------------------------
// TSQLiteDatabase
//------------------------------------------------------------------------------

constructor TSQLiteDatabase.Create(const FileName: string);
var
  Msg: pchar;
  iResult: integer;
begin
  inherited Create;

  self.fInTrans := False;

  Msg := nil;
  try
    iResult := SQLite3_Open(PChar(FileName), Fdb);

    if iResult <> SQLITE_OK then
      if Assigned(Fdb) then
      begin
        Msg := Sqlite3_ErrMsg(Fdb);
        raise ESqliteException.CreateFmt('Failed to open database "%s" : %s',
          [FileName, Msg]);
      end
      else
        raise ESqliteException.CreateFmt('Failed to open database "%s" : unknown error',
          [FileName]);

    //set a few configs
    self.ExecSQL('PRAGMA SYNCHRONOUS=NORMAL;');
//    self.ExecSQL('PRAGMA full_column_names = 1;');
    self.ExecSQL('PRAGMA temp_store = MEMORY;');

  finally
    if Assigned(Msg) then
      SQLite3_Free(Msg);
  end;

end;


//..............................................................................

destructor TSQLiteDatabase.Destroy;
begin

  if self.fInTrans then
    self.ExecSQL('ROLLBACK;'); //assume rollback

  if Assigned(fDB) then
    SQLite3_Close(fDB);

  inherited;
end;

function TSQLiteDatabase.GetLastInsertRowID: int64;
begin
  Result := Sqlite3_LastInsertRowID(self.fDB);
end;

//..............................................................................

procedure TSQLiteDatabase.RaiseError(s: string; SQL: string);
//look up last error and raise an exception with an appropriate message
var
  Msg: PChar;
begin

  Msg := nil;

  if sqlite3_errcode(self.fDB) <> SQLITE_OK then
    Msg := sqlite3_errmsg(self.fDB);

  if Msg <> nil then
    raise ESqliteException.CreateFmt(s + ' "%s" : %s', [SQL, Msg])
  else
    raise ESqliteException.CreateFmt(s, [SQL, 'No message']);

end;

procedure TSQLiteDatabase.ExecSQL(const SQL: string);
var
  Stmt: TSQLiteStmt;
  NextSQLStatement: Pchar;
  iStepResult: integer;
begin
  try

    if Sqlite3_Prepare(self.fDB, PChar(SQL), -1, Stmt, NextSQLStatement) <>
      SQLITE_OK then
      RaiseError('Error executing SQL', SQL);

    if (Stmt = nil) then
      RaiseError('Could not prepare SQL statement', SQL);

    iStepResult := Sqlite3_step(Stmt);

    if (iStepResult <> SQLITE_DONE) then
      RaiseError('Error executing SQL statement', SQL);

  finally

    if Assigned(Stmt) then
      Sqlite3_Finalize(stmt);

  end;
end;

procedure TSQLiteDatabase.UpdateBlob(const SQL: string; BlobData: TStream);
var
  iSize: integer;
  ptr: pointer;
  Stmt: TSQLiteStmt;
  Msg: Pchar;
  NextSQLStatement: Pchar;
  iStepResult: integer;
  iBindResult: integer;
begin
  //expects SQL of the form 'UPDATE MYTABLE SET MYFIELD = ? WHERE MYKEY = 1'

  if pos('?', SQL) = 0 then
    RaiseError('SQL must include a ? parameter', SQL);

  Msg := nil;
  try

    if Sqlite3_Prepare(self.fDB, PChar(SQL), -1, Stmt, NextSQLStatement) <>
      SQLITE_OK then
      RaiseError('Could not prepare SQL statement', SQL);

    if (Stmt = nil) then
      RaiseError('Could not prepare SQL statement', SQL);

    //now bind the blob data
    iSize := BlobData.size;

    GetMem(ptr, iSize);

    if (ptr = nil) then
      raise ESqliteException.CreateFmt('Error getting memory to save blob',
        [SQL, 'Error']);

    BlobData.position := 0;
    BlobData.Read(ptr^, iSize);

    iBindResult := SQLite3_BindBlob(stmt, 1, ptr, iSize, @DisposePointer);

    if iBindResult <> SQLITE_OK then
      RaiseError('Error binding blob to database', SQL);

    iStepResult := Sqlite3_step(Stmt);

    if (iStepResult <> SQLITE_DONE) then
      RaiseError('Error executing SQL statement', SQL);

  finally

    if Assigned(Stmt) then
      Sqlite3_Finalize(stmt);

    if Assigned(Msg) then
      SQLite3_Free(Msg);
  end;

end;

//..............................................................................

function TSQLiteDatabase.GetTable(const SQL: string): TSQLiteTable;
begin
  Result := TSQLiteTable.Create(Self, SQL);
end;

function TSQLiteDatabase.GetTableValue(const SQL: string): int64;
var
  Table: TSQLiteTable;
begin
  Table := self.GetTable(SQL);
  try
    Result := Table.FieldAsInteger(0);
  finally
    Table.Free;
  end;
end;

function TSQLiteDatabase.GetTableString(const SQL: string): string;
var
  Table: TSQLiteTable;
begin
  Table := self.GetTable(SQL);
  try
    Result := Table.FieldAsString(0);
  finally
    Table.Free;
  end;
end;


procedure TSQLiteDatabase.BeginTransaction;
begin
  if not self.fInTrans then
  begin
    self.ExecSQL('BEGIN TRANSACTION;');
    self.fInTrans := True;
  end
  else
    raise ESqliteException.Create('Transaction already open');
end;

procedure TSQLiteDatabase.Commit;
begin
  self.ExecSQL('COMMIT;');
  self.fInTrans := False;
end;

procedure TSQLiteDatabase.Rollback;
begin
  self.ExecSQL('ROLLBACK;');
  self.fInTrans := False;
end;

function TSQLiteDatabase.TableExists(TableName: string): boolean;
var
  sql: string;
  ds: TSqliteTable;
begin
  //returns true if table exists in the database
  sql := 'select [sql] from sqlite_master where [type] = "table" and lower(name) = "' +
    lowercase(TableName) + '"';
  ds := self.GetTable(sql);
  try
    Result := (ds.Count > 0);
  finally
    ds.Free;
  end;
end;

procedure TSQLiteDatabase.SetTimeout(Value: integer);
begin
  SQLite3_BusyTimeout(self.fDB, Value);
end;

function TSQLiteDatabase.version: string;
begin
  Result := SQLite3_Version;
end;


//------------------------------------------------------------------------------
// TSQLiteTable
//------------------------------------------------------------------------------

constructor TSQLiteTable.Create(DB: TSQLiteDatabase; const SQL: string);
var
  Stmt: TSQLiteStmt;
  NextSQLStatement: Pchar;
  iStepResult: integer;
  ptr: pointer;
  iNumBytes: integer;
  thisBlobValue: TMemoryStream;
  thisStringValue: pstring;
  thisDoubleValue: pDouble;
  thisIntValue: pInt64;
  thisColType: pInteger;
  i: integer;
  DeclaredColType: Pchar;
  ActualColType: integer;
  ptrValue: Pchar;
begin
  try
    self.fRowCount := 0;
    self.fColCount := 0;
    //if there are several SQL statements in SQL, NextSQLStatment points to the
    //beginning of the next one. Prepare only prepares the first SQL statement.
    if Sqlite3_Prepare(DB.fDB, PChar(SQL), -1, Stmt, NextSQLStatement) <> SQLITE_OK then
      DB.RaiseError('Error executing SQL', SQL);
    if (Stmt = nil) then
      DB.RaiseError('Could not prepare SQL statement', SQL);
    iStepResult := Sqlite3_step(Stmt);
    while (iStepResult <> SQLITE_DONE) do
    begin
      case iStepResult of
        SQLITE_ROW:
          begin
            Inc(fRowCount);
            if (fRowCount = 1) then
            begin
            //get data types
              fCols := TStringList.Create;
              fColTypes := TList.Create;
              fColCount := SQLite3_ColumnCount(stmt);
              for i := 0 to Pred(fColCount) do
                fCols.Add(AnsiUpperCase(Sqlite3_ColumnName(stmt, i)));
              for i := 0 to Pred(fColCount) do
              begin
                new(thisColType);
                DeclaredColType := Sqlite3_ColumnDeclType(stmt, i);
                if DeclaredColType = nil then
                  thisColType^ := Sqlite3_ColumnType(stmt, i) //use the actual column type instead
                //seems to be needed for last_insert_rowid
                else
                  if (DeclaredColType = 'INTEGER') or (DeclaredColType = 'BOOLEAN') then
                    thisColType^ := dtInt
                  else
                    if (DeclaredColType = 'NUMERIC') or
                      (DeclaredColType = 'FLOAT') or
                      (DeclaredColType = 'DOUBLE') or
                      (DeclaredColType = 'REAL') then
                      thisColType^ := dtNumeric
                    else
                      if DeclaredColType = 'BLOB' then
                        thisColType^ := dtBlob
                      else
                        thisColType^ := dtStr;
                fColTypes.Add(thiscoltype);
              end;
              fResults := TList.Create;
            end;

          //get column values
            for i := 0 to Pred(ColCount) do
            begin
              ActualColType := Sqlite3_ColumnType(stmt, i);
              if (ActualColType = SQLITE_NULL) then
                fResults.Add(nil)
              else
                if pInteger(fColTypes[i])^ = dtInt then
                begin
                  new(thisintvalue);
                  thisintvalue^ := Sqlite3_ColumnInt64(stmt, i);
                  fResults.Add(thisintvalue);
                end
                else
                  if pInteger(fColTypes[i])^ = dtNumeric then
                  begin
                    new(thisdoublevalue);
                    thisdoublevalue^ := Sqlite3_ColumnDouble(stmt, i);
                    fResults.Add(thisdoublevalue);
                  end
                  else
                    if pInteger(fColTypes[i])^ = dtBlob then
                    begin
                      iNumBytes := Sqlite3_ColumnBytes(stmt, i);
                      if iNumBytes = 0 then
                        thisblobvalue := nil
                      else
                      begin
                        thisblobvalue := TMemoryStream.Create;
                        thisblobvalue.position := 0;
                        ptr := Sqlite3_ColumnBlob(stmt, i);
                        thisblobvalue.writebuffer(ptr^, iNumBytes);
                      end;
                      fResults.Add(thisblobvalue);
                    end
                    else
                    begin
                      new(thisstringvalue);
                      ptrValue := Sqlite3_ColumnText(stmt, i);
                      setstring(thisstringvalue^, ptrvalue, strlen(ptrvalue));
                      fResults.Add(thisstringvalue);
                    end;
            end;
          end;
        SQLITE_BUSY:
          raise ESqliteException.CreateFmt('Could not prepare SQL statement',
            [SQL, 'SQLite is Busy']);
      else
        DB.RaiseError('Could not retrieve data', SQL);
      end;
      iStepResult := Sqlite3_step(Stmt);
    end;
    fRow := 0;
  finally
    if Assigned(Stmt) then
      Sqlite3_Finalize(stmt);
  end;
end;

//..............................................................................

destructor TSQLiteTable.Destroy;
var
  i: cardinal;
  iColNo: integer;
begin
  if Assigned(fResults) then
  begin
    for i := 0 to fResults.Count - 1 do
    begin
      //check for blob type
      iColNo := (i mod fColCount);
      case pInteger(self.fColTypes[iColNo])^ of
        dtBlob:
          TMemoryStream(fResults[i]).Free;
        dtStr:
          if fResults[i] <> nil then
          begin
            setstring(string(fResults[i]^), nil, 0);
            dispose(fResults[i]);
          end;
      else
        dispose(fResults[i]);
      end;
    end;
    fResults.Free;
  end;
  if Assigned(fCols) then
    fCols.Free;
  if Assigned(fColTypes) then
    for i := 0 to fColTypes.Count - 1 do
      dispose(fColTypes[i]);
  fColTypes.Free;
  inherited;
end;

//..............................................................................

function TSQLiteTable.GetColumns(I: integer): string;
begin
  Result := fCols[I];
end;

//..............................................................................

function TSQLiteTable.GetCountResult: integer;
begin
  if not EOF then
    Result := StrToInt(Fields[0])
  else
    Result := 0;
end;

function TSQLiteTable.GetCount: integer;
begin
  Result := FRowCount;
end;

//..............................................................................

function TSQLiteTable.GetEOF: boolean;
begin
  Result := fRow >= fRowCount;
end;

function TSQLiteTable.GetBOF: boolean;
begin
  Result := fRow <= 0;
end;

//..............................................................................

function TSQLiteTable.GetFieldByName(FieldName: string): string;
begin
  Result := GetFields(self.GetFieldIndex(FieldName));
end;

function TSQLiteTable.GetFieldIndex(FieldName: string): integer;
begin

  if (fCols = nil) then
  begin
    raise ESqliteException.Create('Field ' + fieldname + ' Not found. Empty dataset');
    exit;
  end;

  if (fCols.count = 0) then
  begin
    raise ESqliteException.Create('Field ' + fieldname + ' Not found. Empty dataset');
    exit;
  end;

  Result := fCols.IndexOf(AnsiUpperCase(FieldName));

  if (result < 0) then
  begin raise ESqliteException.Create('Field not found in dataset: ' + fieldname) end;

end;

//..............................................................................

function TSQLiteTable.GetFields(I: cardinal): string;
var
  thisvalue: pstring;
  thistype: integer;
begin
  Result := '';
  if EOF then
    raise ESqliteException.Create('Table is at End of File');
  //integer types are not stored in the resultset
  //as strings, so they should be retrieved using the type-specific
  //methods
  thistype := pInteger(self.fColTypes[I])^;

  case thistype of
    dtStr:
      begin
        thisvalue := self.fResults[(self.frow * self.fColCount) + I];
        if (thisvalue <> nil) then
          Result := thisvalue^
        else
          Result := '';
      end;
    dtInt:
      Result := IntToStr(self.FieldAsInteger(I));
    dtNumeric:
      Result := FloatToStr(self.FieldAsDouble(I));
    dtBlob:
      Result := self.FieldAsBlobText(I);
  else
    Result := '';
  end;
end;

function TSqliteTable.FieldAsBlob(I: cardinal): TMemoryStream;
begin
  if EOF then
    raise ESqliteException.Create('Table is at End of File');
  if (self.fResults[(self.frow * self.fColCount) + I] = nil) then
    Result := nil
  else
    if pInteger(self.fColTypes[I])^ = dtBlob then
      Result := TMemoryStream(self.fResults[(self.frow * self.fColCount) + I])
    else
      raise ESqliteException.Create('Not a Blob field');
end;

function TSqliteTable.FieldAsBlobText(I: cardinal): string;
var
  MemStream: TMemoryStream;
  Buffer: PChar;
begin
  Result := '';
  MemStream := self.FieldAsBlob(I);
  if MemStream <> nil then
    if MemStream.Size > 0 then
    begin
      MemStream.position := 0;
      Buffer := stralloc(MemStream.Size + 1);
      MemStream.readbuffer(Buffer[0], MemStream.Size);
      (Buffer + MemStream.Size)^ := chr(0);
      SetString(Result, Buffer, MemStream.size);
      strdispose(Buffer);
    end;
end;


function TSqliteTable.FieldAsInteger(I: cardinal): int64;
begin
  if EOF then
    //raise ESqliteException.Create('Table is at End of File');
    Result := 0
  else if (self.fResults[(self.frow * self.fColCount) + I] = nil) then
    Result := 0
  else
    if pInteger(self.fColTypes[I])^ = dtInt then
      Result := pInt64(self.fResults[(self.frow * self.fColCount) + I])^
    else
      if pInteger(self.fColTypes[I])^ = dtNumeric then
        Result := trunc(strtofloat(pString(self.fResults[(self.frow * self.fColCount) + I])^))
      else
        raise ESqliteException.Create('Not an integer or numeric field');
end;

function TSqliteTable.FieldAsDouble(I: cardinal): double;
begin
  if EOF then
    raise ESqliteException.Create('Table is at End of File');
  if (self.fResults[(self.frow * self.fColCount) + I] = nil) then
    Result := 0
  else
    if pInteger(self.fColTypes[I])^ = dtInt then
      Result := pInt64(self.fResults[(self.frow * self.fColCount) + I])^
    else
      if pInteger(self.fColTypes[I])^ = dtNumeric then
        Result := pDouble(self.fResults[(self.frow * self.fColCount) + I])^
      else
        raise ESqliteException.Create('Not an integer or numeric field');
end;

function TSqliteTable.FieldAsString(I: cardinal): string;
begin
  if EOF then
    raise ESqliteException.Create('Table is at End of File');
  if (self.fResults[(self.frow * self.fColCount) + I] = nil) then
    Result := ''
  else
    Result := self.GetFields(I);
end;

function TSqliteTable.FieldIsNull(I: cardinal): boolean;
var
  thisvalue: pointer;
begin
  if EOF then
    raise ESqliteException.Create('Table is at End of File');
  thisvalue := self.fResults[(self.frow * self.fColCount) + I];
  Result := (thisvalue = nil);
end;

//..............................................................................

function TSQLiteTable.Next: boolean;
begin
  Result := False;
  if not EOF then
  begin
    Inc(fRow);
    Result := True;
  end;
end;

function TSQLiteTable.Previous: boolean;
begin
  Result := False;
  if not BOF then
  begin
    Dec(fRow);
    Result := True;
  end;
end;

function TSQLiteTable.MoveFirst: boolean;
begin
  Result := False;
  if self.fRowCount > 0 then
  begin
    fRow := 0;
    Result := True;
  end;
end;

function TSQLiteTable.MoveLast: boolean;
begin
  Result := False;
  if self.fRowCount > 0 then
  begin
    fRow := fRowCount - 1;
    Result := True;
  end;
end;


end.