-
-
Notifications
You must be signed in to change notification settings - Fork 2.6k
/
Copy pathogrsqlitevirtualogr.cpp
2792 lines (2386 loc) · 91.9 KB
/
ogrsqlitevirtualogr.cpp
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
/******************************************************************************
*
* Project: OpenGIS Simple Features Reference Implementation
* Purpose: SQLite Virtual Table module using OGR layers
* Author: Even Rouault, even dot rouault at spatialys.com
*
******************************************************************************
* Copyright (c) 2012-2013, Even Rouault <even dot rouault at spatialys.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, MAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
****************************************************************************/
#include "cpl_port.h"
#include "ogrsqlitevirtualogr.h"
#include <cctype>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <limits>
#include <map>
#include <set>
#include <string>
#include <utility>
#include <vector>
#include "cpl_conv.h"
#include "cpl_error.h"
#include "cpl_string.h"
/************************************************************************/
/* OGR2SQLITE_GetNameForGeometryColumn() */
/************************************************************************/
CPLString OGR2SQLITE_GetNameForGeometryColumn(OGRLayer *poLayer)
{
const char *pszGeomColumn = poLayer->GetGeometryColumn();
if (pszGeomColumn != nullptr && !EQUAL(pszGeomColumn, ""))
{
if (poLayer->GetLayerDefn()->GetFieldIndex(pszGeomColumn) < 0)
return pszGeomColumn;
}
CPLString osGeomCol("GEOMETRY");
int nTry = 2;
while (poLayer->GetLayerDefn()->GetFieldIndex(osGeomCol) >= 0)
{
osGeomCol.Printf("GEOMETRY%d", nTry++);
}
return osGeomCol;
}
#if !defined(HAVE_SQLITE3EXT_H)
// Stub functions
void OGR2SQLITE_Register()
{
}
OGR2SQLITEModule *OGR2SQLITE_Setup(GDALDataset *, OGRSQLiteDataSource *)
{
return nullptr;
}
int OGR2SQLITE_AddExtraDS(OGR2SQLITEModule *, OGRDataSource *)
{
return 0;
}
#else
/************************************************************************/
/* OGR2SQLITE_Register() */
/************************************************************************/
CPL_C_START
int CPL_DLL OGR2SQLITE_static_register(sqlite3 *hDB, char **pzErrMsg,
void *pApi);
CPL_C_END
/* We call this function so that each time a db is created, */
/* OGR2SQLITE_static_register is called, to initialize the sqlite3_api */
/* structure with the right pointers. */
/* We need to declare this function before including sqlite3ext.h, since */
/* sqlite 3.8.7, sqlite3_auto_extension can be a macro (#5725) */
void OGR2SQLITE_Register()
{
#if !defined(SQLITE_HAS_NON_DEPRECATED_AUTO_EXTENSION) && defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated"
#endif
sqlite3_auto_extension((void (*)(void))OGR2SQLITE_static_register);
#if !defined(SQLITE_HAS_NON_DEPRECATED_AUTO_EXTENSION) && defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
}
#define VIRTUAL_OGR_DYNAMIC_EXTENSION_ENABLED
// #define DEBUG_OGR2SQLITE
#include "gdal_priv.h"
#include "ogr_api.h"
#include "ogr_core.h"
#include "ogr_feature.h"
#include "ogr_geometry.h"
#include "ogr_p.h"
#include "ogr_spatialref.h"
#include "ogrsf_frmts.h"
#include "ogrsqlitesqlfunctions.h"
#include "ogrsqliteutility.h"
#include "ogr_swq.h"
#include "sqlite3.h"
#include "sqlite3ext.h"
#undef SQLITE_EXTENSION_INIT1
#define SQLITE_EXTENSION_INIT1 \
const sqlite3_api_routines *sqlite3_api = nullptr;
/* Declaration of sqlite3_api structure */
static SQLITE_EXTENSION_INIT1
/* The layout of fields is :
0 : RegularField0
...
n-1 : RegularField(n-1)
n : OGR_STYLE (may be HIDDEN)
n+1 : GEOMETRY
*/
#define COMPILATION_ALLOWED
#include "ogrsqlitesqlfunctions.cpp" /* yes the .cpp file, to make it work on Windows with load_extension('gdalXX.dll') */
#undef COMPILATION_ALLOWED
/************************************************************************/
/* OGR2SQLITEModule */
/************************************************************************/
class OGR2SQLITEModule
{
#ifdef DEBUG
void *pDummy; /* to track memory leaks */
#endif
sqlite3 *hDB; /* *NOT* to be freed */
GDALDataset *poDS; /* *NOT* to be freed */
std::vector<OGRDataSource *> apoExtraDS; /* each datasource to be freed */
OGRSQLiteDataSource *poSQLiteDS; /* *NOT* to be freed, might be NULL */
std::map<CPLString, OGRLayer *> oMapVTableToOGRLayer;
void *hHandleSQLFunctions;
public:
OGR2SQLITEModule();
~OGR2SQLITEModule();
int Setup(GDALDataset *poDS, OGRSQLiteDataSource *poSQLiteDS);
int Setup(sqlite3 *hDB);
GDALDataset *GetDS()
{
return poDS;
}
int AddExtraDS(OGRDataSource *poDS);
OGRDataSource *GetExtraDS(int nIndex);
int FetchSRSId(const OGRSpatialReference *poSRS);
void RegisterVTable(const char *pszVTableName, OGRLayer *poLayer);
void UnregisterVTable(const char *pszVTableName);
OGRLayer *GetLayerForVTable(const char *pszVTableName);
void SetHandleSQLFunctions(void *hHandleSQLFunctionsIn);
};
/************************************************************************/
/* OGR2SQLITEModule() */
/************************************************************************/
OGR2SQLITEModule::OGR2SQLITEModule()
:
#ifdef DEBUG
pDummy(CPLMalloc(1)),
#endif
hDB(nullptr), poDS(nullptr), poSQLiteDS(nullptr),
hHandleSQLFunctions(nullptr)
{
}
/************************************************************************/
/* ~OGR2SQLITEModule */
/************************************************************************/
OGR2SQLITEModule::~OGR2SQLITEModule()
{
#ifdef DEBUG
CPLFree(pDummy);
#endif
for (int i = 0; i < static_cast<int>(apoExtraDS.size()); i++)
delete apoExtraDS[i];
OGRSQLiteUnregisterSQLFunctions(hHandleSQLFunctions);
}
/************************************************************************/
/* SetHandleSQLFunctions() */
/************************************************************************/
void OGR2SQLITEModule::SetHandleSQLFunctions(void *hHandleSQLFunctionsIn)
{
CPLAssert(hHandleSQLFunctions == nullptr);
hHandleSQLFunctions = hHandleSQLFunctionsIn;
}
/************************************************************************/
/* AddExtraDS() */
/************************************************************************/
int OGR2SQLITEModule::AddExtraDS(OGRDataSource *poDSIn)
{
int nRet = (int)apoExtraDS.size();
apoExtraDS.push_back(poDSIn);
return nRet;
}
/************************************************************************/
/* GetExtraDS() */
/************************************************************************/
OGRDataSource *OGR2SQLITEModule::GetExtraDS(int nIndex)
{
if (nIndex < 0 || nIndex >= (int)apoExtraDS.size())
return nullptr;
return apoExtraDS[nIndex];
}
/************************************************************************/
/* Setup() */
/************************************************************************/
int OGR2SQLITEModule::Setup(GDALDataset *poDSIn,
OGRSQLiteDataSource *poSQLiteDSIn)
{
CPLAssert(poDS == nullptr);
CPLAssert(poSQLiteDS == nullptr);
poDS = poDSIn;
poSQLiteDS = poSQLiteDSIn;
return Setup(poSQLiteDS->GetDB());
}
/************************************************************************/
/* FetchSRSId() */
/************************************************************************/
// TODO(schwehr): Refactor FetchSRSId to be much simpler.
int OGR2SQLITEModule::FetchSRSId(const OGRSpatialReference *poSRS)
{
int nSRSId = -1;
if (poSQLiteDS != nullptr)
{
nSRSId = poSQLiteDS->GetUndefinedSRID();
if (poSRS != nullptr)
nSRSId = poSQLiteDS->FetchSRSId(poSRS);
}
else
{
if (poSRS != nullptr)
{
const char *pszAuthorityName = poSRS->GetAuthorityName(nullptr);
if (pszAuthorityName != nullptr && EQUAL(pszAuthorityName, "EPSG"))
{
const char *pszAuthorityCode = poSRS->GetAuthorityCode(nullptr);
if (pszAuthorityCode != nullptr && strlen(pszAuthorityCode) > 0)
{
nSRSId = atoi(pszAuthorityCode);
}
}
}
}
return nSRSId;
}
/************************************************************************/
/* RegisterVTable() */
/************************************************************************/
void OGR2SQLITEModule::RegisterVTable(const char *pszVTableName,
OGRLayer *poLayer)
{
oMapVTableToOGRLayer[pszVTableName] = poLayer;
}
/************************************************************************/
/* UnregisterVTable() */
/************************************************************************/
void OGR2SQLITEModule::UnregisterVTable(const char *pszVTableName)
{
oMapVTableToOGRLayer[pszVTableName] = nullptr;
}
/************************************************************************/
/* GetLayerForVTable() */
/************************************************************************/
OGRLayer *OGR2SQLITEModule::GetLayerForVTable(const char *pszVTableName)
{
std::map<CPLString, OGRLayer *>::iterator oIter =
oMapVTableToOGRLayer.find(pszVTableName);
if (oIter == oMapVTableToOGRLayer.end())
{
if (poDS == poSQLiteDS)
return poSQLiteDS->GetLayerByName(pszVTableName);
return nullptr;
}
OGRLayer *poLayer = oIter->second;
if (poLayer == nullptr)
{
/* If the associate layer is null, then try to "ping" the virtual */
/* table since we know that we have managed to create it before */
if (sqlite3_exec(hDB,
CPLSPrintf("PRAGMA table_info(\"%s\")",
SQLEscapeName(pszVTableName).c_str()),
nullptr, nullptr, nullptr) == SQLITE_OK)
{
poLayer = oMapVTableToOGRLayer[pszVTableName];
}
}
return poLayer;
}
/* See http://www.sqlite.org/vtab.html for the documentation on how to
implement a new module for the Virtual Table mechanism. */
/************************************************************************/
/* OGR2SQLITE_vtab */
/************************************************************************/
typedef struct
{
/* Mandatory fields by sqlite3: don't change or reorder them ! */
const sqlite3_module *pModule;
int nRef;
char *zErrMsg;
/* Extension fields */
char *pszVTableName;
OGR2SQLITEModule *poModule;
GDALDataset *poDS;
int bCloseDS;
OGRLayer *poLayer;
int nMyRef;
} OGR2SQLITE_vtab;
/************************************************************************/
/* OGR2SQLITE_vtab_cursor */
/************************************************************************/
typedef struct
{
/* Mandatory fields by sqlite3: don't change or reorder them ! */
OGR2SQLITE_vtab *pVTab;
/* Extension fields */
OGRDataSource *poDupDataSource;
OGRLayer *poLayer;
OGRFeature *poFeature;
/* nFeatureCount >= 0 if the layer has a feast feature count capability. */
/* In which case nNextWishedIndex and nCurFeatureIndex */
/* will be used to avoid useless GetNextFeature() */
/* Helps in SELECT COUNT(*) FROM xxxx scenarios */
GIntBig nFeatureCount;
GIntBig nNextWishedIndex;
GIntBig nCurFeatureIndex;
GByte *pabyGeomBLOB;
int nGeomBLOBLen;
} OGR2SQLITE_vtab_cursor;
#ifdef VIRTUAL_OGR_DYNAMIC_EXTENSION_ENABLED
/************************************************************************/
/* OGR2SQLITEDetectSuspiciousUsage() */
/************************************************************************/
static int OGR2SQLITEDetectSuspiciousUsage(sqlite3 *hDB,
const char *pszVirtualTableName,
char **pzErr)
{
char **papszResult = nullptr;
int nRowCount = 0;
int nColCount = 0;
/* Collect database names */
sqlite3_get_table(hDB, "PRAGMA database_list", &papszResult, &nRowCount,
&nColCount, nullptr);
std::vector<CPLString> aosDatabaseNames;
for (int i = 1; i <= nRowCount; i++)
{
const char *pszUnescapedName = papszResult[i * nColCount + 1];
aosDatabaseNames.push_back(CPLSPrintf(
"\"%s\".sqlite_master", SQLEscapeName(pszUnescapedName).c_str()));
}
/* Add special database (just in case, not sure it is really needed) */
aosDatabaseNames.push_back("sqlite_temp_master");
sqlite3_free_table(papszResult);
papszResult = nullptr;
/* Check the triggers of each database */
for (int i = 0; i < (int)aosDatabaseNames.size(); i++)
{
nRowCount = 0;
nColCount = 0;
const char *pszSQL =
CPLSPrintf("SELECT name, sql FROM %s "
"WHERE (type = 'trigger' OR type = 'view') AND ("
"sql LIKE '%%%s%%' OR "
"sql LIKE '%%\"%s\"%%' OR "
"sql LIKE '%%ogr_layer_%%' )",
aosDatabaseNames[i].c_str(), pszVirtualTableName,
SQLEscapeName(pszVirtualTableName).c_str());
sqlite3_get_table(hDB, pszSQL, &papszResult, &nRowCount, &nColCount,
nullptr);
sqlite3_free_table(papszResult);
papszResult = nullptr;
if (nRowCount > 0)
{
if (!CPLTestBool(CPLGetConfigOption(
"ALLOW_VIRTUAL_OGR_FROM_TRIGGER_AND_VIEW", "NO")))
{
*pzErr = sqlite3_mprintf(
"A trigger and/or view might reference VirtualOGR table "
"'%s'.\n"
"This is suspicious practice that could be used to steal "
"data without your consent.\n"
"Disabling access to it unless you define the "
"ALLOW_VIRTUAL_OGR_FROM_TRIGGER_AND_VIEW "
"configuration option to YES.",
pszVirtualTableName);
return TRUE;
}
}
}
return FALSE;
}
#endif // VIRTUAL_OGR_DYNAMIC_EXTENSION_ENABLED
/************************************************************************/
/* OGR2SQLITE_ConnectCreate() */
/************************************************************************/
static int OGR2SQLITE_DisconnectDestroy(sqlite3_vtab *pVTab);
static int OGR2SQLITE_ConnectCreate(sqlite3 *hDB, void *pAux, int argc,
const char *const *argv,
sqlite3_vtab **ppVTab, char **pzErr)
{
#ifdef DEBUG_OGR2SQLITE
CPLDebug("OGR2SQLITE", "ConnectCreate(%s)", argv[2]);
#endif
OGR2SQLITEModule *poModule = (OGR2SQLITEModule *)pAux;
OGRLayer *poLayer = nullptr;
bool bExposeOGR_STYLE = false;
bool bCloseDS = false;
bool bInternalUse = false;
bool bExposeOGRNativeData = false;
/* -------------------------------------------------------------------- */
/* If called from ogrexecutesql.cpp */
/* -------------------------------------------------------------------- */
GDALDataset *poDS = poModule->GetDS();
if (poDS != nullptr && (argc == 6 || argc == 7) &&
CPLGetValueType(argv[3]) == CPL_VALUE_INTEGER)
{
bInternalUse = true;
int nDSIndex = atoi(argv[3]);
if (nDSIndex >= 0)
{
poDS = poModule->GetExtraDS(nDSIndex);
if (poDS == nullptr)
{
*pzErr =
sqlite3_mprintf("Invalid dataset index : %d", nDSIndex);
return SQLITE_ERROR;
}
}
CPLString osLayerName(SQLUnescape(argv[4]));
poLayer = poDS->GetLayerByName(osLayerName);
if (poLayer == nullptr)
{
*pzErr =
sqlite3_mprintf("Cannot find layer '%s' in '%s'",
osLayerName.c_str(), poDS->GetDescription());
return SQLITE_ERROR;
}
bExposeOGR_STYLE = atoi(SQLUnescape(argv[5])) != 0;
bExposeOGRNativeData =
(argc == 7) ? atoi(SQLUnescape(argv[6])) != 0 : false;
}
#ifdef VIRTUAL_OGR_DYNAMIC_EXTENSION_ENABLED
/* -------------------------------------------------------------------- */
/* If called from outside (OGR loaded as a sqlite3 extension) */
/* -------------------------------------------------------------------- */
else
{
if (argc < 4 || argc > 8)
{
*pzErr = sqlite3_mprintf(
"Expected syntax: CREATE VIRTUAL TABLE xxx USING "
"VirtualOGR(datasource_name[, update_mode, [layer_name[, "
"expose_ogr_style[, expose_ogr_native_data]]]])");
return SQLITE_ERROR;
}
if (OGR2SQLITEDetectSuspiciousUsage(hDB, argv[2], pzErr))
{
return SQLITE_ERROR;
}
CPLString osDSName(SQLUnescape(argv[3]));
CPLString osUpdate(SQLUnescape((argc >= 5) ? argv[4] : "0"));
if (!EQUAL(osUpdate, "1") && !EQUAL(osUpdate, "0"))
{
*pzErr = sqlite3_mprintf("update_mode parameter should be 0 or 1");
return SQLITE_ERROR;
}
const bool bUpdate = atoi(osUpdate) != 0;
poDS = (OGRDataSource *)OGROpenShared(osDSName, bUpdate, nullptr);
if (poDS == nullptr)
{
*pzErr = sqlite3_mprintf("Cannot open datasource '%s'",
osDSName.c_str());
return SQLITE_ERROR;
}
CPLString osLayerName;
if (argc >= 6)
{
osLayerName = SQLUnescape(argv[5]);
poLayer = poDS->GetLayerByName(osLayerName);
}
else
{
if (poDS->GetLayerCount() == 0)
{
*pzErr = sqlite3_mprintf("Datasource '%s' has no layers",
osDSName.c_str());
poDS->Release();
return SQLITE_ERROR;
}
if (poDS->GetLayerCount() > 1)
{
*pzErr =
sqlite3_mprintf("Datasource '%s' has more than one layers, "
"and none was explicitly selected.",
osDSName.c_str());
poDS->Release();
return SQLITE_ERROR;
}
poLayer = poDS->GetLayer(0);
}
if (poLayer == nullptr)
{
*pzErr = sqlite3_mprintf("Cannot find layer '%s' in '%s'",
osLayerName.c_str(), osDSName.c_str());
poDS->Release();
return SQLITE_ERROR;
}
if (argc >= 7)
{
bExposeOGR_STYLE = atoi(SQLUnescape(argv[6])) != 0;
}
if (argc >= 8)
{
bExposeOGRNativeData = atoi(SQLUnescape(argv[7])) != 0;
}
bCloseDS = true;
}
#endif // VIRTUAL_OGR_DYNAMIC_EXTENSION_ENABLED
OGR2SQLITE_vtab *vtab =
(OGR2SQLITE_vtab *)CPLCalloc(1, sizeof(OGR2SQLITE_vtab));
/* We do not need to fill the non-extended fields */
vtab->pszVTableName = CPLStrdup(SQLEscapeName(argv[2]));
vtab->poModule = poModule;
vtab->poDS = poDS;
vtab->bCloseDS = bCloseDS;
vtab->poLayer = poLayer;
vtab->nMyRef = 0;
poModule->RegisterVTable(vtab->pszVTableName, poLayer);
*ppVTab = (sqlite3_vtab *)vtab;
CPLString osSQL;
osSQL = "CREATE TABLE ";
osSQL += "\"";
osSQL += SQLEscapeName(argv[2]);
osSQL += "\"";
osSQL += "(";
bool bAddComma = false;
OGRFeatureDefn *poFDefn = poLayer->GetLayerDefn();
bool bHasOGR_STYLEField = false;
std::set<std::string> oSetNamesUC;
for (int i = 0; i < poFDefn->GetFieldCount(); i++)
{
if (bAddComma)
osSQL += ",";
bAddComma = true;
OGRFieldDefn *poFieldDefn = poFDefn->GetFieldDefn(i);
if (EQUAL(poFieldDefn->GetNameRef(), "OGR_STYLE"))
bHasOGR_STYLEField = true;
CPLString osFieldName(poFieldDefn->GetNameRef());
int nCounter = 2;
while (oSetNamesUC.find(CPLString(osFieldName).toupper()) !=
oSetNamesUC.end())
{
do
{
osFieldName.Printf("%s%d", poFieldDefn->GetNameRef(), nCounter);
nCounter++;
} while (poFDefn->GetFieldIndex(osFieldName) >= 0);
}
oSetNamesUC.insert(CPLString(osFieldName).toupper());
osSQL += "\"";
osSQL += SQLEscapeName(osFieldName);
osSQL += "\"";
osSQL += " ";
std::string osType(OGRSQLiteFieldDefnToSQliteFieldDefn(
poFieldDefn, bInternalUse, false));
if (bInternalUse)
{
const auto &osDomainName = poFieldDefn->GetDomainName();
if (!osDomainName.empty())
{
// Avoids illegal VARCHAR(n)_BEGIN_DOMAIN_NAME_... to be
// emitted
if (poFieldDefn->GetType() == OFTString)
osType = "VARCHAR";
osType += "_BEGIN_DOMAIN_NAME_";
char *pszEncoded = CPLBinaryToHex(
static_cast<int>(osDomainName.size()),
reinterpret_cast<const GByte *>(osDomainName.data()));
osType += pszEncoded;
CPLFree(pszEncoded);
osType += "_END_DOMAIN_NAME";
}
}
osSQL += osType;
}
if (bAddComma)
osSQL += ",";
if (bHasOGR_STYLEField)
{
osSQL += "'dummy' VARCHAR HIDDEN";
}
else
{
osSQL += "OGR_STYLE VARCHAR";
if (!bExposeOGR_STYLE)
osSQL += " HIDDEN";
}
for (int i = 0; i < poFDefn->GetGeomFieldCount(); i++)
{
osSQL += ",";
OGRGeomFieldDefn *poFieldDefn = poFDefn->GetGeomFieldDefn(i);
osSQL += "\"";
if (i == 0)
osSQL +=
SQLEscapeName(OGR2SQLITE_GetNameForGeometryColumn(poLayer));
else
osSQL += SQLEscapeName(poFieldDefn->GetNameRef());
osSQL += "\"";
osSQL += " BLOB";
/* We use a special column type, e.g. BLOB_POINT_25D_4326 */
/* when the virtual table is created by OGRSQLiteExecuteSQL() */
/* and thus for internal use only. */
if (bInternalUse)
{
osSQL += "_";
osSQL += OGRToOGCGeomType(poFieldDefn->GetType());
osSQL += "_XY";
if (wkbHasZ(poFieldDefn->GetType()))
osSQL += "Z";
if (wkbHasM(poFieldDefn->GetType()))
osSQL += "M";
const OGRSpatialReference *poSRS = poFieldDefn->GetSpatialRef();
if (poSRS == nullptr && i == 0)
poSRS = poLayer->GetSpatialRef();
int nSRID = poModule->FetchSRSId(poSRS);
if (nSRID >= 0)
{
osSQL += "_";
osSQL += CPLSPrintf("%d", nSRID);
}
}
}
osSQL += ", OGR_NATIVE_DATA VARCHAR";
if (!bExposeOGRNativeData)
osSQL += " HIDDEN";
osSQL += ", OGR_NATIVE_MEDIA_TYPE VARCHAR";
if (!bExposeOGRNativeData)
osSQL += " HIDDEN";
osSQL += ")";
CPLDebug("OGR2SQLITE", "sqlite3_declare_vtab(%s)", osSQL.c_str());
if (sqlite3_declare_vtab(hDB, osSQL.c_str()) != SQLITE_OK)
{
*pzErr = sqlite3_mprintf("CREATE VIRTUAL: invalid SQL statement : %s",
osSQL.c_str());
OGR2SQLITE_DisconnectDestroy((sqlite3_vtab *)vtab);
return SQLITE_ERROR;
}
return SQLITE_OK;
}
/************************************************************************/
/* OGR2SQLITE_IsHandledOp() */
/************************************************************************/
static bool OGR2SQLITE_IsHandledOp(int op)
{
switch (op)
{
case SQLITE_INDEX_CONSTRAINT_EQ:
return true;
case SQLITE_INDEX_CONSTRAINT_GT:
return true;
case SQLITE_INDEX_CONSTRAINT_LE:
return true;
case SQLITE_INDEX_CONSTRAINT_LT:
return true;
case SQLITE_INDEX_CONSTRAINT_GE:
return true;
case SQLITE_INDEX_CONSTRAINT_MATCH:
return false; // unhandled
#ifdef SQLITE_INDEX_CONSTRAINT_LIKE
/* SQLite >= 3.10 */
case SQLITE_INDEX_CONSTRAINT_LIKE:
return true;
case SQLITE_INDEX_CONSTRAINT_GLOB:
return false; // unhandled
case SQLITE_INDEX_CONSTRAINT_REGEXP:
return false; // unhandled
#endif
#ifdef SQLITE_INDEX_CONSTRAINT_NE
/* SQLite >= 3.21 */
case SQLITE_INDEX_CONSTRAINT_NE:
return true;
case SQLITE_INDEX_CONSTRAINT_ISNOT:
return false; // OGR SQL only handles IS [NOT] NULL
case SQLITE_INDEX_CONSTRAINT_ISNOTNULL:
return true;
case SQLITE_INDEX_CONSTRAINT_ISNULL:
return true;
;
case SQLITE_INDEX_CONSTRAINT_IS:
return false; // OGR SQL only handles IS [NOT] NULL
#endif
default:
break;
}
return false;
}
/************************************************************************/
/* OGR2SQLITE_BestIndex() */
/************************************************************************/
static int OGR2SQLITE_BestIndex(sqlite3_vtab *pVTab, sqlite3_index_info *pIndex)
{
OGR2SQLITE_vtab *pMyVTab = (OGR2SQLITE_vtab *)pVTab;
OGRFeatureDefn *poFDefn = pMyVTab->poLayer->GetLayerDefn();
#ifdef DEBUG_OGR2SQLITE
CPLString osQueryPatternUsable, osQueryPatternNotUsable;
for (int i = 0; i < pIndex->nConstraint; i++)
{
int iCol = pIndex->aConstraint[i].iColumn;
const char *pszFieldName = NULL;
if (iCol == -1)
pszFieldName = "FID";
else if (iCol >= 0 && iCol < poFDefn->GetFieldCount())
pszFieldName = poFDefn->GetFieldDefn(iCol)->GetNameRef();
else
pszFieldName = "unknown_field";
const char *pszOp = NULL;
switch (pIndex->aConstraint[i].op)
{
case SQLITE_INDEX_CONSTRAINT_EQ:
pszOp = " = ";
break;
case SQLITE_INDEX_CONSTRAINT_GT:
pszOp = " > ";
break;
case SQLITE_INDEX_CONSTRAINT_LE:
pszOp = " <= ";
break;
case SQLITE_INDEX_CONSTRAINT_LT:
pszOp = " < ";
break;
case SQLITE_INDEX_CONSTRAINT_GE:
pszOp = " >= ";
break;
case SQLITE_INDEX_CONSTRAINT_MATCH:
pszOp = " MATCH ";
break;
#ifdef SQLITE_INDEX_CONSTRAINT_LIKE
/* SQLite >= 3.10 */
case SQLITE_INDEX_CONSTRAINT_LIKE:
pszOp = " LIKE ";
break;
case SQLITE_INDEX_CONSTRAINT_GLOB:
pszOp = " GLOB ";
break;
case SQLITE_INDEX_CONSTRAINT_REGEXP:
pszOp = " REGEXP ";
break;
#endif
#ifdef SQLITE_INDEX_CONSTRAINT_NE
/* SQLite >= 3.21 */
case SQLITE_INDEX_CONSTRAINT_NE:
pszOp = " <> ";
break;
case SQLITE_INDEX_CONSTRAINT_ISNOT:
pszOp = " IS NOT ";
break;
case SQLITE_INDEX_CONSTRAINT_ISNOTNULL:
pszOp = " IS NOT NULL";
break;
case SQLITE_INDEX_CONSTRAINT_ISNULL:
pszOp = " IS NULL";
break;
case SQLITE_INDEX_CONSTRAINT_IS:
pszOp = " IS ";
break;
#endif
default:
pszOp = " (unknown op) ";
break;
}
if (pIndex->aConstraint[i].usable)
{
if (!osQueryPatternUsable.empty())
osQueryPatternUsable += " AND ";
osQueryPatternUsable += pszFieldName;
osQueryPatternUsable += pszOp;
osQueryPatternUsable += "?";
}
else
{
if (!osQueryPatternNotUsable.empty())
osQueryPatternNotUsable += " AND ";
osQueryPatternNotUsable += pszFieldName;
osQueryPatternNotUsable += pszOp;
osQueryPatternNotUsable += "?";
}
}
CPLDebug("OGR2SQLITE", "BestIndex, usable ( %s ), not usable ( %s )",
osQueryPatternUsable.c_str(), osQueryPatternNotUsable.c_str());
#endif
int nConstraints = 0;
for (int i = 0; i < pIndex->nConstraint; i++)
{
int iCol = pIndex->aConstraint[i].iColumn;
if (pIndex->aConstraint[i].usable &&
OGR2SQLITE_IsHandledOp(pIndex->aConstraint[i].op) &&
iCol < poFDefn->GetFieldCount() &&
(iCol < 0 || poFDefn->GetFieldDefn(iCol)->GetType() != OFTBinary))
{
pIndex->aConstraintUsage[i].argvIndex = nConstraints + 1;
pIndex->aConstraintUsage[i].omit = true;
nConstraints++;
}
else
{
pIndex->aConstraintUsage[i].argvIndex = 0;
pIndex->aConstraintUsage[i].omit = false;
}
}
int *panConstraints = nullptr;
if (nConstraints)
{
panConstraints =
(int *)sqlite3_malloc((int)sizeof(int) * (1 + 2 * nConstraints));
panConstraints[0] = nConstraints;
nConstraints = 0;
for (int i = 0; i < pIndex->nConstraint; i++)
{
if (pIndex->aConstraintUsage[i].omit)
{
panConstraints[2 * nConstraints + 1] =
pIndex->aConstraint[i].iColumn;
panConstraints[2 * nConstraints + 2] =
pIndex->aConstraint[i].op;
nConstraints++;
}
}
}
pIndex->orderByConsumed = false;
pIndex->idxNum = 0;
if (nConstraints != 0)
{
pIndex->idxStr = (char *)panConstraints;
pIndex->needToFreeIdxStr = true;
}
else
{
pIndex->idxStr = nullptr;
pIndex->needToFreeIdxStr = false;
}
return SQLITE_OK;
}
/************************************************************************/
/* OGR2SQLITE_DisconnectDestroy() */
/************************************************************************/
static int OGR2SQLITE_DisconnectDestroy(sqlite3_vtab *pVTab)
{
OGR2SQLITE_vtab *pMyVTab = (OGR2SQLITE_vtab *)pVTab;
#ifdef DEBUG_OGR2SQLITE
CPLDebug("OGR2SQLITE", "DisconnectDestroy(%s)", pMyVTab->pszVTableName);
#endif
sqlite3_free(pMyVTab->zErrMsg);