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
|
/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2011 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
#ifndef MAPNIK_SQLITE_UTILS_HPP
#define MAPNIK_SQLITE_UTILS_HPP
// stl
#include <string>
#include <vector>
#include <algorithm>
// mapnik
#include <mapnik/debug.hpp>
#include <mapnik/utils.hpp>
#include <mapnik/datasource.hpp>
#include <mapnik/params.hpp>
#include <mapnik/geometry.hpp>
#include <mapnik/sql_utils.hpp>
#include <mapnik/util/fs.hpp>
// boost
#include <boost/shared_ptr.hpp>
#include <boost/make_shared.hpp>
#include <boost/algorithm/string.hpp>
// sqlite
extern "C" {
#include <sqlite3.h>
}
#include "sqlite_resultset.hpp"
#include "sqlite_prepared.hpp"
#include "sqlite_connection.hpp"
//==============================================================================
class sqlite_utils
{
public:
static bool needs_quoting(std::string const& name)
{
if (name.size() > 0)
{
const char first = name[0];
if (is_quote_char(first))
{
return false;
}
if ((first >= '0' && first <= '9') ||
(name.find("-") != std::string::npos)
)
{
return true;
}
}
return false;
}
static bool is_quote_char(const char z)
{
if (z == '"' || z == '\'' || z == '[' || z == '`')
{
return true;
}
return false;
}
static void dequote(std::string & z)
{
boost::algorithm::trim_if(z,boost::algorithm::is_any_of("[]'\"`"));
}
static std::string index_for_table(std::string const& table, std::string const& field)
{
std::string table_trimmed = table;
dequote(table_trimmed);
return "\"idx_" + table_trimmed + "_" + field + "\"";
}
static std::string index_for_db(std::string const& file)
{
//std::size_t idx = file.find_last_of(".");
//if(idx != std::string::npos) {
// return file.substr(0,idx) + ".index" + file.substr(idx);
//}
//else
//{
return file + ".index";
//}
}
static bool apply_spatial_filter(std::string & query,
mapnik::box2d<double> const& e,
std::string const& table,
std::string const& key_field,
std::string const& index_table,
std::string const& geometry_table,
std::string const& intersects_token)
{
std::ostringstream spatial_sql;
spatial_sql << std::setprecision(16);
spatial_sql << key_field << " IN (SELECT pkid FROM " << index_table;
spatial_sql << " WHERE xmax>=" << e.minx() << " AND xmin<=" << e.maxx() ;
spatial_sql << " AND ymax>=" << e.miny() << " AND ymin<=" << e.maxy() << ")";
if (boost::algorithm::ifind_first(query, intersects_token))
{
boost::algorithm::ireplace_all(query, intersects_token, spatial_sql.str());
return true;
}
// substitute first WHERE found if not using JOIN
// (because we can't know the WHERE is on the right table)
else if (boost::algorithm::ifind_first(query, "WHERE")
&& !boost::algorithm::ifind_first(query, "JOIN"))
{
std::string replace(" WHERE " + spatial_sql.str() + " AND ");
boost::algorithm::ireplace_first(query, "WHERE", replace);
return true;
}
// fallback to appending spatial filter at end of query
else if (boost::algorithm::ifind_first(query, geometry_table))
{
query = table + " WHERE " + spatial_sql.str();
return true;
}
return false;
}
static void get_tables(boost::shared_ptr<sqlite_connection> ds,
std::vector<std::string> & tables)
{
std::ostringstream sql;
// todo handle finding tables from attached db's
sql << " SELECT name FROM sqlite_master"
<< " WHERE type IN ('table','view')"
<< " AND name NOT LIKE 'sqlite_%'"
<< " AND name NOT LIKE 'idx_%'"
<< " AND name NOT LIKE '%geometry_columns%'"
<< " AND name NOT LIKE '%ref_sys%'"
<< " UNION ALL"
<< " SELECT name FROM sqlite_temp_master"
<< " WHERE type IN ('table','view')"
<< " ORDER BY 1";
sqlite3_stmt* stmt = 0;
const int rc = sqlite3_prepare_v2 (*(*ds), sql.str().c_str(), -1, &stmt, 0);
if (rc == SQLITE_OK)
{
boost::shared_ptr<sqlite_resultset> rs = boost::make_shared<sqlite_resultset>(stmt);
while (rs->is_valid() && rs->step_next())
{
const int type_oid = rs->column_type(0);
if (type_oid == SQLITE_TEXT)
{
const char * data = rs->column_text(0);
if (data)
{
tables.push_back(std::string(data));
}
}
}
}
}
static void query_extent(boost::shared_ptr<sqlite_resultset> rs,
mapnik::box2d<double>& extent)
{
bool first = true;
while (rs->is_valid() && rs->step_next())
{
int size;
const char* data = static_cast<const char*>(rs->column_blob(0, size));
if (data)
{
boost::ptr_vector<mapnik::geometry_type> paths;
if (mapnik::geometry_utils::from_wkb(paths, data, size, mapnik::wkbAuto))
{
for (unsigned i=0; i<paths.size(); ++i)
{
mapnik::box2d<double> const& bbox = paths[i].envelope();
if (bbox.valid())
{
if (first)
{
first = false;
extent = bbox;
}
else
{
extent.expand_to_include(bbox);
}
}
}
}
}
}
}
static bool create_spatial_index(std::string const& index_db,
std::string const& index_table,
boost::shared_ptr<sqlite_resultset> rs)
{
/* TODO
- speedups
- return early/recover from failure
- allow either in db or in separate
*/
if (!rs->is_valid())
return false;
#if SQLITE_VERSION_NUMBER >= 3005000
int flags = SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE | SQLITE_OPEN_FULLMUTEX;
#else
int flags;
#endif
bool existed = mapnik::util::exists(index_db);
boost::shared_ptr<sqlite_connection> ds = boost::make_shared<sqlite_connection>(index_db,flags);
bool one_success = false;
try
{
ds->execute("PRAGMA synchronous=OFF");
ds->execute("BEGIN IMMEDIATE TRANSACTION");
/*
ds->execute("PRAGMA journal_mode=WAL");
ds->execute("PRAGMA fullfsync=1");
ds->execute("PRAGMA locking_mode = EXCLUSIVE");
ds->execute("BEGIN EXCLUSIVE TRANSACTION");
*/
// first drop the index if it already exists
std::ostringstream spatial_index_drop_sql;
spatial_index_drop_sql << "DROP TABLE IF EXISTS " << index_table;
ds->execute(spatial_index_drop_sql.str());
// create the spatial index
std::ostringstream create_idx;
create_idx << "create virtual table "
<< index_table
<< " using rtree(pkid, xmin, xmax, ymin, ymax)";
// insert for prepared statement
std::ostringstream insert_idx;
insert_idx << "insert into "
<< index_table
<< " values (?,?,?,?,?)";
ds->execute(create_idx.str());
prepared_index_statement ps(ds,insert_idx.str());
while (rs->is_valid() && rs->step_next())
{
int size;
const char* data = (const char*) rs->column_blob(0, size);
if (data)
{
boost::ptr_vector<mapnik::geometry_type> paths;
mapnik::box2d<double> bbox;
if (mapnik::geometry_utils::from_wkb(paths, data, size, mapnik::wkbAuto))
{
for (unsigned i=0; i<paths.size(); ++i)
{
if (i==0)
{
bbox = paths[i].envelope();
}
else
{
bbox.expand_to_include(paths[i].envelope());
}
}
}
if (bbox.valid())
{
ps.bind(bbox);
const int type_oid = rs->column_type(1);
if (type_oid != SQLITE_INTEGER)
{
std::ostringstream error_msg;
error_msg << "Sqlite Plugin: invalid type for key field '"
<< rs->column_name(1) << "' when creating index '" << index_table
<< "' type was: " << type_oid << "";
throw mapnik::datasource_exception(error_msg.str());
}
const sqlite_int64 pkid = rs->column_integer64(1);
ps.bind(pkid);
}
else
{
std::ostringstream error_msg;
error_msg << "SQLite Plugin: encountered invalid bbox at '"
<< rs->column_name(1) << "' == " << rs->column_integer64(1);
throw mapnik::datasource_exception(error_msg.str());
}
ps.step_next();
one_success = true;
}
}
}
catch (mapnik::datasource_exception const& ex)
{
if (!existed)
{
try
{
mapnik::util::remove(index_db);
}
catch (...) {};
}
throw mapnik::datasource_exception(ex.what());
}
if (one_success)
{
ds->execute("COMMIT");
return true;
}
else if (!existed)
{
try
{
mapnik::util::remove(index_db);
}
catch (...) {};
}
return false;
}
typedef struct {
sqlite_int64 pkid;
mapnik::box2d<double> bbox;
} rtree_type;
static void build_tree(boost::shared_ptr<sqlite_resultset> rs,
std::vector<sqlite_utils::rtree_type> & rtree_list)
{
while (rs->is_valid() && rs->step_next())
{
int size;
const char* data = static_cast<const char*>(rs->column_blob(0, size));
if (data)
{
boost::ptr_vector<mapnik::geometry_type> paths;
if (mapnik::geometry_utils::from_wkb(paths, data, size, mapnik::wkbAuto))
{
for (unsigned i=0; i<paths.size(); ++i)
{
mapnik::box2d<double> const& bbox = paths[i].envelope();
if (bbox.valid())
{
const int type_oid = rs->column_type(1);
if (type_oid != SQLITE_INTEGER)
{
std::ostringstream error_msg;
error_msg << "Sqlite Plugin: invalid type for key field '"
<< rs->column_name(1) << "' when creating index "
<< "type was: " << type_oid << "";
throw mapnik::datasource_exception(error_msg.str());
}
const sqlite_int64 pkid = rs->column_integer64(1);
rtree_type entry = rtree_type();
entry.pkid = pkid;
entry.bbox = bbox;
rtree_list.push_back(entry);
}
else
{
std::ostringstream error_msg;
error_msg << "SQLite Plugin: encountered invalid bbox at '"
<< rs->column_name(1) << "' == " << rs->column_integer64(1);
throw mapnik::datasource_exception(error_msg.str());
}
}
}
}
}
}
static bool create_spatial_index2(std::string const& index_db,
std::string const& index_table,
std::vector<rtree_type> const& rtree_list)
{
#if SQLITE_VERSION_NUMBER >= 3005000
int flags = SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE | SQLITE_OPEN_FULLMUTEX;
#else
int flags;
#endif
bool existed = mapnik::util::exists(index_db);;
boost::shared_ptr<sqlite_connection> ds = boost::make_shared<sqlite_connection>(index_db,flags);
bool one_success = false;
try
{
ds->execute("PRAGMA synchronous=OFF");
ds->execute("BEGIN IMMEDIATE TRANSACTION");
// first drop the index if it already exists
std::ostringstream spatial_index_drop_sql;
spatial_index_drop_sql << "DROP TABLE IF EXISTS " << index_table;
ds->execute(spatial_index_drop_sql.str());
// create the spatial index
std::ostringstream create_idx;
create_idx << "create virtual table "
<< index_table
<< " using rtree(pkid, xmin, xmax, ymin, ymax)";
// insert for prepared statement
std::ostringstream insert_idx;
insert_idx << "insert into "
<< index_table
<< " values (?,?,?,?,?)";
ds->execute(create_idx.str());
prepared_index_statement ps(ds,insert_idx.str());
std::vector<rtree_type>::const_iterator it = rtree_list.begin();
std::vector<rtree_type>::const_iterator end = rtree_list.end();
for (; it != end; ++it)
{
ps.bind(it->bbox);
ps.bind(it->pkid);
ps.step_next();
one_success = true;
}
}
catch (mapnik::datasource_exception const& ex)
{
if (!existed)
{
try
{
mapnik::util::remove(index_db);
}
catch (...) {};
}
throw mapnik::datasource_exception(ex.what());
}
if (one_success)
{
ds->execute("COMMIT");
return true;
}
else if (!existed)
{
try
{
mapnik::util::remove(index_db);
}
catch (...) {};
}
return false;
}
static bool detect_extent(boost::shared_ptr<sqlite_connection> ds,
bool has_spatial_index,
mapnik::box2d<double> & extent,
std::string const& index_table,
std::string const& metadata,
std::string const& geometry_field,
std::string const& geometry_table,
std::string const& key_field,
std::string const& table
)
{
if (! metadata.empty())
{
std::ostringstream s;
s << "SELECT xmin, ymin, xmax, ymax FROM " << metadata;
s << " WHERE LOWER(f_table_name) = LOWER('" << geometry_table << "')";
boost::shared_ptr<sqlite_resultset> rs(ds->execute_query(s.str()));
if (rs->is_valid() && rs->step_next())
{
double xmin = rs->column_double(0);
double ymin = rs->column_double(1);
double xmax = rs->column_double(2);
double ymax = rs->column_double(3);
extent.init (xmin, ymin, xmax, ymax);
return true;
}
}
else if (has_spatial_index)
{
std::ostringstream s;
s << "SELECT MIN(xmin), MIN(ymin), MAX(xmax), MAX(ymax) FROM "
<< index_table;
boost::shared_ptr<sqlite_resultset> rs(ds->execute_query(s.str()));
if (rs->is_valid() && rs->step_next())
{
if (! rs->column_isnull(0))
{
double xmin = rs->column_double(0);
double ymin = rs->column_double(1);
double xmax = rs->column_double(2);
double ymax = rs->column_double(3);
extent.init (xmin, ymin, xmax, ymax);
return true;
}
}
}
else if (! key_field.empty())
{
std::ostringstream s;
s << "SELECT " << geometry_field << "," << key_field
<< " FROM (" << table << ")";
boost::shared_ptr<sqlite_resultset> rs(ds->execute_query(s.str()));
sqlite_utils::query_extent(rs,extent);
return true;
}
return false;
}
static bool has_rtree(std::string const& index_table,boost::shared_ptr<sqlite_connection> ds)
{
try
{
std::ostringstream s;
s << "SELECT pkid,xmin,xmax,ymin,ymax FROM " << index_table << " LIMIT 1";
boost::shared_ptr<sqlite_resultset> rs = ds->execute_query(s.str());
if (rs->is_valid() && rs->step_next())
{
return true;
}
}
catch (std::exception const& ex)
{
MAPNIK_LOG_DEBUG(sqlite) << "has_rtree returned:" << ex.what();
return false;
}
return false;
}
static bool detect_types_from_subquery(std::string const& query,
std::string & geometry_field,
mapnik::layer_descriptor & desc,
boost::shared_ptr<sqlite_connection> ds)
{
bool found = false;
boost::shared_ptr<sqlite_resultset> rs(ds->execute_query(query));
if (rs->is_valid() && rs->step_next())
{
for (int i = 0; i < rs->column_count(); ++i)
{
found = true;
const int type_oid = rs->column_type(i);
const char* fld_name = rs->column_name(i);
switch (type_oid)
{
case SQLITE_INTEGER:
desc.add_descriptor(mapnik::attribute_descriptor(fld_name, mapnik::Integer));
break;
case SQLITE_FLOAT:
desc.add_descriptor(mapnik::attribute_descriptor(fld_name, mapnik::Double));
break;
case SQLITE_TEXT:
desc.add_descriptor(mapnik::attribute_descriptor(fld_name, mapnik::String));
break;
case SQLITE_NULL:
// sqlite reports based on value, not actual column type unless
// PRAGMA table_info is used so here we assume the column is a string
// which is a lesser evil than altogether dropping the column
desc.add_descriptor(mapnik::attribute_descriptor(fld_name, mapnik::String));
break;
case SQLITE_BLOB:
if (geometry_field.empty()
&& (boost::algorithm::icontains(fld_name, "geom") ||
boost::algorithm::icontains(fld_name, "point") ||
boost::algorithm::icontains(fld_name, "linestring") ||
boost::algorithm::icontains(fld_name, "polygon")))
{
geometry_field = std::string(fld_name);
}
break;
default:
MAPNIK_LOG_DEBUG(sqlite) << "detect_types_from_subquery: unknown type_oid=" << type_oid;
break;
}
}
}
return found;
}
static bool table_info(std::string & key_field,
bool detected_types,
std::string & field,
std::string & table,
mapnik::layer_descriptor & desc,
boost::shared_ptr<sqlite_connection> ds)
{
// http://www.sqlite.org/pragma.html#pragma_table_info
// use pragma table_info to detect primary key
// and to detect types if no subquery is used or
// if the subquery-based type detection failed
std::ostringstream s;
s << "PRAGMA table_info(" << table << ")";
boost::shared_ptr<sqlite_resultset> rs(ds->execute_query(s.str()));
bool found_table = false;
bool found_pk = false;
while (rs->is_valid() && rs->step_next())
{
found_table = true;
const char* fld_name = rs->column_text(1);
std::string fld_type(rs->column_text(2));
sqlite_int64 fld_pk = rs->column_integer64(5);
std::transform(fld_type.begin(), fld_type.end(), fld_type.begin(), ::tolower);
// TODO - how to handle primary keys on multiple columns ?
if (key_field.empty() && ! found_pk && fld_pk != 0)
{
key_field = fld_name;
found_pk = true;
}
if (! detected_types)
{
// see 2.1 "Column Affinity" at http://www.sqlite.org/datatype3.html
// TODO - refactor this somehow ?
if (field.empty()
&& ((boost::algorithm::contains(fld_type, "geom") ||
boost::algorithm::contains(fld_type, "point") ||
boost::algorithm::contains(fld_type, "linestring") ||
boost::algorithm::contains(fld_type, "polygon"))
||
(boost::algorithm::icontains(fld_name, "geom") ||
boost::algorithm::icontains(fld_name, "point") ||
boost::algorithm::icontains(fld_name, "linestring") ||
boost::algorithm::icontains(fld_name, "polygon")))
)
{
field = std::string(fld_name);
}
else if (boost::algorithm::contains(fld_type, "int"))
{
desc.add_descriptor(mapnik::attribute_descriptor(fld_name, mapnik::Integer));
}
else if (boost::algorithm::contains(fld_type, "text") ||
boost::algorithm::contains(fld_type, "char") ||
boost::algorithm::contains(fld_type, "clob"))
{
desc.add_descriptor(mapnik::attribute_descriptor(fld_name, mapnik::String));
}
else if (boost::algorithm::contains(fld_type, "real") ||
boost::algorithm::contains(fld_type, "float") ||
boost::algorithm::contains(fld_type, "double"))
{
desc.add_descriptor(mapnik::attribute_descriptor(fld_name, mapnik::Double));
}
else if (boost::algorithm::contains(fld_type, "blob"))
{
if (! field.empty())
{
desc.add_descriptor(mapnik::attribute_descriptor(fld_name, mapnik::String));
}
}
else
{
// "Column Affinity" says default to "Numeric" but for now we pass..
//desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::Double));
#ifdef MAPNIK_LOG
// Do not fail when we specify geometry_field in XML file
if (field.empty())
{
MAPNIK_LOG_DEBUG(sqlite) << "Column '"
<< std::string(fld_name)
<< "' unhandled due to unknown type: "
<< fld_type;
}
#endif
}
}
}
return found_table;
}
};
#endif // MAPNIK_SQLITE_UTILS_HPP
|
