-
Notifications
You must be signed in to change notification settings - Fork 44
/
SQLiteTable3.pas
1487 lines (1316 loc) · 41.9 KB
/
SQLiteTable3.pas
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
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
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 execution of SQL query.
It run query and read all returned rows to internal buffer.
It allows accessing fields by name as well as index and can move through a
result set forward and backwards, or randomly to any row.
TSQLiteUniTable wraps execution of SQL query.
It run query as TSQLiteTable, but reading just first row only!
You can step to next row (until not EOF) by 'Next' method.
You cannot step backwards! (So, it is called as UniDirectional result set.)
It not using any internal buffering, this class is very close to Sqlite API.
It allows accessing fields by name as well as index on actual row only.
Very good and fast for sequentional scanning of large result sets with minimal
memory footprint.
Warning! Do not close TSQLiteDatabase before any TSQLiteUniTable,
because query is closed on TSQLiteUniTable destructor and database connection
is used during TSQLiteUniTable live!
SQL parameter usage:
You can add named parameter values by call set of AddParam* methods.
Parameters will be used for first next SQL statement only.
Parameter name must be prefixed by ':', '$' or '@' and same prefix must be
used in SQL statement!
Sample:
table.AddParamText(':str', 'some value');
s := table.GetTableString('SELECT value FROM sometable WHERE id=:str');
Notes from Andrew Retmanski on prepared queries
The changes are as follows:
SQLiteTable3.pas
- Added new boolean property Synchronised (this controls the SYNCHRONOUS pragma as I found that turning this OFF increased the write performance in my application)
- Added new type TSQLiteQuery (this is just a simple record wrapper around the SQL string and a TSQLiteStmt pointer)
- Added PrepareSQL method to prepare SQL query - returns TSQLiteQuery
- Added ReleaseSQL method to release previously prepared query
- Added overloaded BindSQL methods for Integer and String types - these set new values for the prepared query parameters
- Added overloaded ExecSQL method to execute a prepared TSQLiteQuery
Usage of the new methods should be self explanatory but the process is in essence:
1. Call PrepareSQL to return TSQLiteQuery 2. Call BindSQL for each parameter in the prepared query 3. Call ExecSQL to run the prepared query 4. Repeat steps 2 & 3 as required 5. Call ReleaseSQL to free SQLite resources
One other point - the Synchronised property throws an error if used inside a transaction.
Acknowledments
Adapted by Tim Anderson ([email protected])
Originally created by Pablo Pissanetzky ([email protected])
Modified and enhanced by Lukas Gebauer
Modified and enhanced by Tobias Gunkel
}
interface
{$IFDEF FPC}
{$MODE Delphi}{$H+}
{$ENDIF}
uses
{$IFDEF WIN32}
Windows,
{$ENDIF}
SQLite3, Classes, SysUtils;
const
dtInt = 1;
dtNumeric = 2;
dtStr = 3;
dtBlob = 4;
dtNull = 5;
type
ESQLiteException = class(Exception)
end;
TSQliteParam = class
public
name: string;
valuetype: integer;
valueinteger: int64;
valuefloat: double;
valuedata: string;
end;
THookQuery = procedure(Sender: TObject; SQL: String) of object;
TSQLiteQuery = record
SQL: String;
Statement: TSQLiteStmt;
end;
TSQLiteTable = class;
TSQLiteUniTable = class;
TSQLiteDatabase = class
private
fDB: TSQLiteDB;
fInTrans: boolean;
fSync: boolean;
fParams: TList;
FOnQuery: THookQuery;
procedure RaiseError(s: string; SQL: string);
procedure SetParams(Stmt: TSQLiteStmt);
procedure BindData(Stmt: TSQLiteStmt; const Bindings: array of const);
function GetRowsChanged: integer;
protected
procedure SetSynchronised(Value: boolean);
procedure DoQuery(value: string);
public
constructor Create(const FileName: string);
destructor Destroy; override;
function GetTable(const SQL: Ansistring): TSQLiteTable; overload;
function GetTable(const SQL: Ansistring; const Bindings: array of const): TSQLiteTable; overload;
procedure ExecSQL(const SQL: Ansistring); overload;
procedure ExecSQL(const SQL: Ansistring; const Bindings: array of const); overload;
procedure ExecSQL(Query: TSQLiteQuery); overload;
function PrepareSQL(const SQL: Ansistring): TSQLiteQuery;
procedure BindSQL(Query: TSQLiteQuery; const Index: Integer; const Value: Integer); overload;
procedure BindSQL(Query: TSQLiteQuery; const Index: Integer; const Value: String); overload;
procedure ReleaseSQL(Query: TSQLiteQuery);
function GetUniTable(const SQL: Ansistring): TSQLiteUniTable; overload;
function GetUniTable(const SQL: Ansistring; const Bindings: array of const): TSQLiteUniTable; overload;
function GetTableValue(const SQL: Ansistring): int64; overload;
function GetTableValue(const SQL: Ansistring; const Bindings: array of const): int64; overload;
function GetTableString(const SQL: Ansistring): string; overload;
function GetTableString(const SQL: Ansistring; const Bindings: array of const): string; overload;
procedure GetTableStrings(const SQL: Ansistring; const Value: TStrings);
procedure UpdateBlob(const SQL: Ansistring; BlobData: TStream);
procedure BeginTransaction;
procedure Commit;
procedure Rollback;
function TableExists(TableName: string): boolean;
function GetLastInsertRowID: int64;
function GetLastChangedRows: int64;
procedure SetTimeout(Value: integer);
function Version: string;
procedure AddCustomCollate(name: string; xCompare: TCollateXCompare);
//adds collate named SYSTEM for correct data sorting by user's locale
Procedure AddSystemCollate;
procedure ParamsClear;
procedure AddParamInt(name: string; value: int64);
procedure AddParamFloat(name: string; value: double);
procedure AddParamText(name: string; value: string);
procedure AddParamNull(name: string);
property DB: TSQLiteDB read fDB;
published
property IsTransactionOpen: boolean read fInTrans;
//database rows that were changed (or inserted or deleted) by the most recent SQL statement
property RowsChanged : integer read getRowsChanged;
property Synchronised: boolean read FSync write SetSynchronised;
property OnQuery: THookQuery read FOnQuery write FOnQuery;
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: Ansistring); overload;
constructor Create(DB: TSQLiteDatabase; const SQL: Ansistring; const Bindings: array of const); overload;
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;
function MoveTo(position: cardinal): 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;
TSQLiteUniTable = class
private
fColCount: cardinal;
fCols: TStringList;
fRow: cardinal;
fEOF: boolean;
fStmt: TSQLiteStmt;
fDB: TSQLiteDatabase;
fSQL: string;
function GetFields(I: cardinal): string;
function GetColumns(I: integer): string;
function GetFieldByName(FieldName: string): string;
function GetFieldIndex(FieldName: string): integer;
public
constructor Create(DB: TSQLiteDatabase; const SQL: Ansistring); overload;
constructor Create(DB: TSQLiteDatabase; const SQL: Ansistring; const Bindings: array of const); overload;
destructor Destroy; override;
function FieldAsInteger(I: cardinal): int64;
function FieldAsBlob(I: cardinal): TMemoryStream;
function FieldAsBlobPtr(I: cardinal; out iNumBytes: integer): Pointer;
function FieldAsBlobText(I: cardinal): string;
function FieldIsNull(I: cardinal): boolean;
function FieldAsString(I: cardinal): string;
function FieldAsDouble(I: cardinal): double;
function Next: boolean;
property EOF: boolean read FEOF;
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 Row: cardinal read fRow;
end;
procedure DisposePointer(ptr: pointer); cdecl;
{$IFDEF WIN32}
function SystemCollate(Userdta: pointer; Buf1Len: integer; Buf1: pointer;
Buf2Len: integer; Buf2: pointer): integer; cdecl;
{$ENDIF}
implementation
procedure DisposePointer(ptr: pointer); cdecl;
begin
if assigned(ptr) then
freemem(ptr);
end;
{$IFDEF WIN32}
function SystemCollate(Userdta: pointer; Buf1Len: integer; Buf1: pointer;
Buf2Len: integer; Buf2: pointer): integer; cdecl;
begin
Result := CompareStringW(LOCALE_USER_DEFAULT, 0, PWideChar(Buf1), Buf1Len,
PWideChar(Buf2), Buf2Len) - 2;
end;
{$ENDIF}
//------------------------------------------------------------------------------
// TSQLiteDatabase
//------------------------------------------------------------------------------
constructor TSQLiteDatabase.Create(const FileName: string);
var
Msg: PAnsiChar;
iResult: integer;
utf8FileName: UTF8string;
begin
inherited Create;
fParams := TList.Create;
self.fInTrans := False;
Msg := nil;
try
utf8FileName := UTF8String(FileName);
iResult := SQLite3_Open(PAnsiChar(utf8FileName), 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
//L.G. Do not call it here. Because busy handler is not setted here,
// any share violation causing exception!
// self.ExecSQL('PRAGMA SYNCHRONOUS=NORMAL;');
// 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.Rollback; //assume rollback
if Assigned(fDB) then
SQLite3_Close(fDB);
ParamsClear;
fParams.Free;
inherited;
end;
function TSQLiteDatabase.GetLastInsertRowID: int64;
begin
Result := Sqlite3_LastInsertRowID(self.fDB);
end;
function TSQLiteDatabase.GetLastChangedRows: int64;
begin
Result := SQLite3_TotalChanges(self.fDB);
end;
//..............................................................................
procedure TSQLiteDatabase.RaiseError(s: string; SQL: string);
//look up last error and raise an exception with an appropriate message
var
Msg: PAnsiChar;
ret : integer;
begin
Msg := nil;
ret := sqlite3_errcode(self.fDB);
if ret <> SQLITE_OK then
Msg := sqlite3_errmsg(self.fDB);
if Msg <> nil then
raise ESqliteException.CreateFmt(s +'.'#13'Error [%d]: %s.'#13'"%s": %s', [ret, SQLiteErrorStr(ret),SQL, Msg])
else
raise ESqliteException.CreateFmt(s, [SQL, 'No message']);
end;
procedure TSQLiteDatabase.SetSynchronised(Value: boolean);
begin
if Value <> fSync then
begin
if Value then
ExecSQL('PRAGMA synchronous = ON;')
else
ExecSQL('PRAGMA synchronous = OFF;');
fSync := Value;
end;
end;
procedure TSQLiteDatabase.BindData(Stmt: TSQLiteStmt; const Bindings: array of const);
var
BlobMemStream: TCustomMemoryStream;
BlobStdStream: TStream;
DataPtr: Pointer;
DataSize: integer;
AnsiStr: AnsiString;
AnsiStrPtr: PAnsiString;
I: integer;
begin
for I := 0 to High(Bindings) do
begin
case Bindings[I].VType of
vtString,
vtAnsiString, vtPChar,
vtWideString, vtPWideChar,
vtChar, vtWideChar:
begin
case Bindings[I].VType of
vtString: begin // ShortString
AnsiStr := Bindings[I].VString^;
DataPtr := PAnsiChar(AnsiStr);
DataSize := Length(AnsiStr)+1;
end;
vtPChar: begin
DataPtr := Bindings[I].VPChar;
DataSize := -1;
end;
vtAnsiString: begin
AnsiStrPtr := PAnsiString(@Bindings[I].VAnsiString);
DataPtr := PAnsiChar(AnsiStrPtr^);
DataSize := Length(AnsiStrPtr^)+1;
end;
vtPWideChar: begin
DataPtr := PAnsiChar(UTF8Encode(WideString(Bindings[I].VPWideChar)));
DataSize := -1;
end;
vtWideString: begin
DataPtr := PAnsiChar(UTF8Encode(PWideString(@Bindings[I].VWideString)^));
DataSize := -1;
end;
vtChar: begin
DataPtr := PAnsiChar(String(Bindings[I].VChar));
DataSize := 2;
end;
vtWideChar: begin
DataPtr := PAnsiChar(UTF8Encode(WideString(Bindings[I].VWideChar)));
DataSize := -1;
end;
else
raise ESqliteException.Create('Unknown string-type');
end;
if (sqlite3_bind_text(Stmt, I+1, DataPtr, DataSize, SQLITE_STATIC) <> SQLITE_OK) then
RaiseError('Could not bind text', 'BindData');
end;
vtInteger:
if (sqlite3_bind_int(Stmt, I+1, Bindings[I].VInteger) <> SQLITE_OK) then
RaiseError('Could not bind integer', 'BindData');
vtInt64:
if (sqlite3_bind_int64(Stmt, I+1, Bindings[I].VInt64^) <> SQLITE_OK) then
RaiseError('Could not bind int64', 'BindData');
vtExtended:
if (sqlite3_bind_double(Stmt, I+1, Bindings[I].VExtended^) <> SQLITE_OK) then
RaiseError('Could not bind extended', 'BindData');
vtBoolean:
if (sqlite3_bind_int(Stmt, I+1, Integer(Bindings[I].VBoolean)) <> SQLITE_OK) then
RaiseError('Could not bind boolean', 'BindData');
vtPointer:
begin
if (Bindings[I].VPointer = nil) then
begin
if (sqlite3_bind_null(Stmt, I+1) <> SQLITE_OK) then
RaiseError('Could not bind null', 'BindData');
end
else
raise ESqliteException.Create('Unhandled pointer (<> nil)');
end;
vtObject:
begin
if (Bindings[I].VObject is TCustomMemoryStream) then
begin
BlobMemStream := TCustomMemoryStream(Bindings[I].VObject);
if (sqlite3_bind_blob(Stmt, I+1, @PAnsiChar(BlobMemStream.Memory)[BlobMemStream.Position],
BlobMemStream.Size-BlobMemStream.Position, SQLITE_STATIC) <> SQLITE_OK) then
begin
RaiseError('Could not bind BLOB', 'BindData');
end;
end
else if (Bindings[I].VObject is TStream) then
begin
BlobStdStream := TStream(Bindings[I].VObject);
DataSize := BlobStdStream.Size;
GetMem(DataPtr, DataSize);
if (DataPtr = nil) then
raise ESqliteException.Create('Error getting memory to save blob');
BlobStdStream.Position := 0;
BlobStdStream.Read(DataPtr^, DataSize);
if (sqlite3_bind_blob(stmt, I+1, DataPtr, DataSize, @DisposePointer) <> SQLITE_OK) then
RaiseError('Could not bind BLOB', 'BindData');
end
else
raise ESqliteException.Create('Unhandled object-type in binding');
end
else
begin
raise ESqliteException.Create('Unhandled binding');
end;
end;
end;
end;
procedure TSQLiteDatabase.ExecSQL(const SQL: Ansistring);
begin
ExecSQL(SQL, []);
end;
procedure TSQLiteDatabase.ExecSQL(const SQL: Ansistring; const Bindings: array of const);
var
Stmt: TSQLiteStmt;
NextSQLStatement: PAnsiChar;
iStepResult: integer;
begin
try
if Sqlite3_Prepare_v2(self.fDB, PAnsiChar(SQL), -1, Stmt, NextSQLStatement) <>
SQLITE_OK then
RaiseError('Error executing SQL', SQL);
if (Stmt = nil) then
RaiseError('Could not prepare SQL statement', SQL);
DoQuery(SQL);
SetParams(Stmt);
BindData(Stmt, Bindings);
iStepResult := Sqlite3_step(Stmt);
if (iStepResult <> SQLITE_DONE) then
begin
SQLite3_reset(stmt);
RaiseError('Error executing SQL statement', SQL);
end;
finally
if Assigned(Stmt) then
Sqlite3_Finalize(stmt);
end;
end;
{$WARNINGS OFF}
procedure TSQLiteDatabase.ExecSQL(Query: TSQLiteQuery);
var
iStepResult: integer;
begin
if Assigned(Query.Statement) then
begin
iStepResult := Sqlite3_step(Query.Statement);
if (iStepResult <> SQLITE_DONE) then
begin
SQLite3_reset(Query.Statement);
RaiseError('Error executing prepared SQL statement', Query.SQL);
end;
Sqlite3_Reset(Query.Statement);
end;
end;
{$WARNINGS ON}
{$WARNINGS OFF}
function TSQLiteDatabase.PrepareSQL(const SQL: Ansistring): TSQLiteQuery;
var
Stmt: TSQLiteStmt;
NextSQLStatement: PAnsiChar;
begin
Result.SQL := SQL;
Result.Statement := nil;
if Sqlite3_Prepare(self.fDB, PAnsiChar(SQL), -1, Stmt, NextSQLStatement) <>
SQLITE_OK then
RaiseError('Error executing SQL', SQL)
else
Result.Statement := Stmt;
if (Result.Statement = nil) then
RaiseError('Could not prepare SQL statement', SQL);
DoQuery(SQL);
end;
{$WARNINGS ON}
{$WARNINGS OFF}
procedure TSQLiteDatabase.BindSQL(Query: TSQLiteQuery; const Index: Integer; const Value: Integer);
begin
if Assigned(Query.Statement) then
sqlite3_Bind_Int(Query.Statement, Index, Value)
else
RaiseError('Could not bind integer to prepared SQL statement', Query.SQL);
end;
{$WARNINGS ON}
{$WARNINGS OFF}
procedure TSQLiteDatabase.BindSQL(Query: TSQLiteQuery; const Index: Integer; const Value: String);
begin
if Assigned(Query.Statement) then
Sqlite3_Bind_Text(Query.Statement, Index, PAnsiChar(Value), Length(Value), Pointer(SQLITE_STATIC))
else
RaiseError('Could not bind string to prepared SQL statement', Query.SQL);
end;
{$WARNINGS ON}
{$WARNINGS OFF}
procedure TSQLiteDatabase.ReleaseSQL(Query: TSQLiteQuery);
begin
if Assigned(Query.Statement) then
begin
Sqlite3_Finalize(Query.Statement);
Query.Statement := nil;
end
else
RaiseError('Could not release prepared SQL statement', Query.SQL);
end;
{$WARNINGS ON}
procedure TSQLiteDatabase.UpdateBlob(const SQL: Ansistring; BlobData: TStream);
var
iSize: integer;
ptr: pointer;
Stmt: TSQLiteStmt;
Msg: PAnsiChar;
NextSQLStatement: PAnsiChar;
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_v2(self.fDB, PAnsiChar(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);
DoQuery(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_Bind_Blob(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
begin
SQLite3_reset(stmt);
RaiseError('Error executing SQL statement', SQL);
end;
finally
if Assigned(Stmt) then
Sqlite3_Finalize(stmt);
if Assigned(Msg) then
SQLite3_Free(Msg);
end;
end;
//..............................................................................
function TSQLiteDatabase.GetTable(const SQL: Ansistring): TSQLiteTable;
begin
Result := TSQLiteTable.Create(Self, SQL);
end;
function TSQLiteDatabase.GetTable(const SQL: Ansistring; const Bindings: array of const): TSQLiteTable;
begin
Result := TSQLiteTable.Create(Self, SQL, Bindings);
end;
function TSQLiteDatabase.GetUniTable(const SQL: Ansistring): TSQLiteUniTable;
begin
Result := TSQLiteUniTable.Create(Self, SQL);
end;
function TSQLiteDatabase.GetUniTable(const SQL: Ansistring; const Bindings: array of const): TSQLiteUniTable;
begin
Result := TSQLiteUniTable.Create(Self, SQL, Bindings);
end;
function TSQLiteDatabase.GetTableValue(const SQL: Ansistring): int64;
begin
Result := GetTableValue(SQL, []);
end;
function TSQLiteDatabase.GetTableValue(const SQL: Ansistring; const Bindings: array of const): int64;
var
Table: TSQLiteUniTable;
begin
Result := 0;
Table := self.GetUniTable(SQL, Bindings);
try
if not Table.EOF then
Result := Table.FieldAsInteger(0);
finally
Table.Free;
end;
end;
function TSQLiteDatabase.GetTableString(const SQL: Ansistring): String;
begin
Result := GetTableString(SQL, []);
end;
function TSQLiteDatabase.GetTableString(const SQL: Ansistring; const Bindings: array of const): String;
var
Table: TSQLiteUniTable;
begin
Result := '';
Table := self.GetUniTable(SQL, Bindings);
try
if not Table.EOF then
Result := Table.FieldAsString(0);
finally
Table.Free;
end;
end;
procedure TSQLiteDatabase.GetTableStrings(const SQL: Ansistring;
const Value: TStrings);
var
Table: TSQLiteUniTable;
begin
Value.Clear;
Table := self.GetUniTable(SQL);
try
while not table.EOF do
begin
Value.Add(Table.FieldAsString(0));
table.Next;
end;
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;
procedure TSQLiteDatabase.AddCustomCollate(name: string;
xCompare: TCollateXCompare);
begin
sqlite3_create_collation(fdb, PAnsiChar(name), SQLITE_UTF8, nil, xCompare);
end;
procedure TSQLiteDatabase.AddSystemCollate;
begin
{$IFDEF WIN32}
sqlite3_create_collation(fdb, 'SYSTEM', SQLITE_UTF16LE, nil, @SystemCollate);
{$ENDIF}
end;
procedure TSQLiteDatabase.ParamsClear;
var
n: integer;
begin
for n := fParams.Count - 1 downto 0 do
TSQliteParam(fparams[n]).free;
fParams.Clear;
end;
procedure TSQLiteDatabase.AddParamInt(name: string; value: int64);
var
par: TSQliteParam;
begin
par := TSQliteParam.Create;
par.name := name;
par.valuetype := SQLITE_INTEGER;
par.valueinteger := value;
fParams.Add(par);
end;
procedure TSQLiteDatabase.AddParamFloat(name: string; value: double);
var
par: TSQliteParam;
begin
par := TSQliteParam.Create;
par.name := name;
par.valuetype := SQLITE_FLOAT;
par.valuefloat := value;
fParams.Add(par);
end;
procedure TSQLiteDatabase.AddParamText(name: string; value: string);
var
par: TSQliteParam;
begin
par := TSQliteParam.Create;
par.name := name;
par.valuetype := SQLITE_TEXT;
par.valuedata := value;
fParams.Add(par);
end;
procedure TSQLiteDatabase.AddParamNull(name: string);
var
par: TSQliteParam;
begin
par := TSQliteParam.Create;
par.name := name;
par.valuetype := SQLITE_NULL;
fParams.Add(par);
end;
procedure TSQLiteDatabase.SetParams(Stmt: TSQLiteStmt);
var
n: integer;
i: integer;
par: TSQliteParam;
begin
try
for n := 0 to fParams.Count - 1 do
begin
par := TSQliteParam(fParams[n]);
i := sqlite3_bind_parameter_index(Stmt, PAnsiChar(par.name));
if i > 0 then
begin
case par.valuetype of
SQLITE_INTEGER:
sqlite3_bind_int64(Stmt, i, par.valueinteger);
SQLITE_FLOAT:
sqlite3_bind_double(Stmt, i, par.valuefloat);
SQLITE_TEXT:
sqlite3_bind_text(Stmt, i, PAnsiChar(par.valuedata),
length(par.valuedata), SQLITE_TRANSIENT);
SQLITE_NULL:
sqlite3_bind_null(Stmt, i);
end;
end;
end;
finally
ParamsClear;
end;
end;
//database rows that were changed (or inserted or deleted) by the most recent SQL statement
function TSQLiteDatabase.GetRowsChanged: integer;
begin
Result := SQLite3_Changes(self.fDB);
end;
procedure TSQLiteDatabase.DoQuery(value: string);
begin
if assigned(OnQuery) then
OnQuery(Self, Value);
end;
//------------------------------------------------------------------------------
// TSQLiteTable
//------------------------------------------------------------------------------
constructor TSQLiteTable.Create(DB: TSQLiteDatabase; const SQL: Ansistring);
begin
Create(DB, SQL, []);
end;
constructor TSQLiteTable.Create(DB: TSQLiteDatabase; const SQL: Ansistring; const Bindings: array of const);
var
Stmt: TSQLiteStmt;
NextSQLStatement: PAnsiChar;
iStepResult: integer;
ptr: pointer;
iNumBytes: integer;
thisBlobValue: TMemoryStream;
thisStringValue: pstring;
thisDoubleValue: pDouble;
thisIntValue: pInt64;
thisColType: pInteger;
i: integer;
DeclaredColType: PAnsiChar;
ActualColType: integer;
ptrValue: PAnsiChar;
begin
inherited create;
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_v2(DB.fDB, PAnsiChar(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);
DB.DoQuery(SQL);
DB.SetParams(Stmt);
DB.BindData(Stmt, Bindings);
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);