-
-
Notifications
You must be signed in to change notification settings - Fork 302
/
select.c
534 lines (436 loc) · 11.6 KB
/
select.c
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
/*!
* \file db/dbmi_client/select.c
*
* \brief DBMI Library (client) - select records from table
*
* (C) 1999-2008 by the GRASS Development Team
*
* This program is free software under the GNU General Public
* License (>=v2). Read the file COPYING that comes with GRASS
* for details.
*
* \author Joel Jones (CERL/UIUC), Radim Blazek
*/
#include <stdlib.h>
#include <string.h>
#include <grass/gis.h>
#include <grass/dbmi.h>
#include <grass/glocale.h>
static int cmp(const void *pa, const void *pb)
{
int *p1 = (int *)pa;
int *p2 = (int *)pb;
if (*p1 < *p2)
return -1;
if (*p1 > *p2)
return 1;
return 0;
}
static int cmpcat(const void *pa, const void *pb)
{
dbCatVal *p1 = (dbCatVal *) pa;
dbCatVal *p2 = (dbCatVal *) pb;
if (p1->cat < p2->cat)
return -1;
if (p1->cat > p2->cat)
return 1;
return 0;
}
static int cmpcatkey(const void *pa, const void *pb)
{
int *p1 = (int *)pa;
dbCatVal *p2 = (dbCatVal *) pb;
if (*p1 < p2->cat)
return -1;
if (*p1 > p2->cat)
return 1;
return 0;
}
static int cmpvalueint(const void *pa, const void *pb)
{
dbCatVal *p1 = (dbCatVal *) pa;
dbCatVal *p2 = (dbCatVal *) pb;
if (p1->val.i < p2->val.i)
return -1;
if (p1->val.i > p2->val.i)
return 1;
return 0;
}
static int cmpvaluedouble(const void *pa, const void *pb)
{
dbCatVal *p1 = (dbCatVal *) pa;
dbCatVal *p2 = (dbCatVal *) pb;
if (p1->val.d < p2->val.d)
return -1;
if (p1->val.d > p2->val.d)
return 1;
return 0;
}
static int cmpvaluestring(const void *pa, const void *pb)
{
dbCatVal *const *a = pa;
dbCatVal *const *b = pb;
return strcmp((const char *)a, (const char *)b);
}
/*!
\brief Select array of ordered integers from table/column
\param driver DB driver
\param tab table name
\param col column name
\param where where statement
\param[out] pval array of ordered integer values
\return number of selected values
\return -1 on error
*/
int db_select_int(dbDriver * driver, const char *tab, const char *col,
const char *where, int **pval)
{
int type, more, alloc, count;
int *val;
char *buf = NULL;
const char *sval;
dbString stmt;
dbCursor cursor;
dbColumn *column;
dbValue *value;
dbTable *table;
G_debug(3, "db_select_int()");
if (col == NULL || strlen(col) == 0) {
G_warning(_("Missing column name"));
return -1;
}
/* allocate */
alloc = 1000;
val = (int *)G_malloc(alloc * sizeof(int));
if (where == NULL || strlen(where) == 0)
G_asprintf(&buf, "SELECT %s FROM %s", col, tab);
else
G_asprintf(&buf, "SELECT %s FROM %s WHERE %s", col, tab, where);
G_debug(3, " SQL: %s", buf);
db_init_string(&stmt);
db_set_string(&stmt, buf);
G_free(buf);
if (db_open_select_cursor(driver, &stmt, &cursor, DB_SEQUENTIAL) != DB_OK)
return (-1);
table = db_get_cursor_table(&cursor);
column = db_get_table_column(table, 0); /* first column */
if (column == NULL) {
return -1;
}
value = db_get_column_value(column);
type = db_get_column_sqltype(column);
type = db_sqltype_to_Ctype(type);
/* fetch the data */
count = 0;
while (1) {
if (db_fetch(&cursor, DB_NEXT, &more) != DB_OK)
return (-1);
if (!more)
break;
if (count == alloc) {
alloc += 1000;
val = (int *)G_realloc(val, alloc * sizeof(int));
}
switch (type) {
case (DB_C_TYPE_INT):
val[count] = db_get_value_int(value);
break;
case (DB_C_TYPE_STRING):
sval = db_get_value_string(value);
val[count] = atoi(sval);
break;
case (DB_C_TYPE_DOUBLE):
val[count] = (int)db_get_value_double(value);
break;
default:
return (-1);
}
count++;
}
db_close_cursor(&cursor);
db_free_string(&stmt);
qsort((void *)val, count, sizeof(int), cmp);
*pval = val;
return (count);
}
/*!
\brief Select one (first) value from table/column for key/id
\param driver DB driver
\param tab table name
\param key key column name
\param id identifier in key column
\param col name of column to select the value from
\param[out] val dbValue to store within
\return number of selected values
\return -1 on error
*/
int db_select_value(dbDriver * driver, const char *tab, const char *key,
int id, const char *col, dbValue * val)
{
int more, count;
char *buf = NULL;
dbString stmt;
dbCursor cursor;
dbColumn *column;
dbValue *value;
dbTable *table;
if (key == NULL || strlen(key) == 0) {
G_warning(_("Missing key column name"));
return -1;
}
if (col == NULL || strlen(col) == 0) {
G_warning(_("Missing column name"));
return -1;
}
G_zero(val, sizeof(dbValue));
G_asprintf(&buf, "SELECT %s FROM %s WHERE %s = %d", col, tab, key, id);
db_init_string(&stmt);
db_set_string(&stmt, buf);
G_free(buf);
if (db_open_select_cursor(driver, &stmt, &cursor, DB_SEQUENTIAL) != DB_OK)
return (-1);
table = db_get_cursor_table(&cursor);
column = db_get_table_column(table, 0); /* first column */
value = db_get_column_value(column);
/* fetch the data */
count = 0;
while (1) {
if (db_fetch(&cursor, DB_NEXT, &more) != DB_OK)
return (-1);
if (!more)
break;
if (count == 0)
db_copy_value(val, value);
count++;
}
db_close_cursor(&cursor);
db_free_string(&stmt);
return (count);
}
/*!
\brief Select pairs key/value to array, values are sorted by key (must be integer)
\param driver DB driver
\param tab table name
\param key key column name
\param col value column name
\param[out] cvarr dbCatValArray to store within
\return number of selected values
\return -1 on error
*/
int db_select_CatValArray(dbDriver * driver, const char *tab, const char *key,
const char *col, const char *where,
dbCatValArray * cvarr)
{
int i, type, more, nrows, ncols;
char *buf = NULL;
dbString stmt;
dbCursor cursor;
dbColumn *column;
dbValue *value;
dbTable *table;
G_debug(3, "db_select_CatValArray ()");
if (key == NULL || strlen(key) == 0) {
G_warning(_("Missing key column name"));
return -1;
}
if (col == NULL || strlen(col) == 0) {
G_warning(_("Missing column name"));
return -1;
}
db_init_string(&stmt);
if (strcmp(key, col) == 0) {
ncols = 1;
G_asprintf(&buf, "SELECT %s FROM %s", key, tab);
}
else {
ncols = 2;
G_asprintf(&buf, "SELECT %s, %s FROM %s", key, col, tab);
}
db_set_string(&stmt, buf);
G_free(buf);
if (where != NULL && strlen(where) > 0) {
db_append_string(&stmt, " WHERE ");
db_append_string(&stmt, where);
}
G_debug(3, " SQL: %s", db_get_string(&stmt));
if (db_open_select_cursor(driver, &stmt, &cursor, DB_SEQUENTIAL) != DB_OK)
return (-1);
nrows = db_get_num_rows(&cursor);
G_debug(3, " %d rows selected", nrows);
if (nrows < 0) {
G_warning(_("Unable select records from table <%s>"), tab);
db_close_cursor(&cursor);
db_free_string(&stmt);
return -1;
}
db_CatValArray_alloc(cvarr, nrows);
table = db_get_cursor_table(&cursor);
/* Check if key column is integer */
column = db_get_table_column(table, 0);
type = db_sqltype_to_Ctype(db_get_column_sqltype(column));
G_debug(3, " key type = %d", type);
if (type != DB_C_TYPE_INT) {
G_warning(_("Key column type is not integer"));
db_close_cursor(&cursor);
db_free_string(&stmt);
return -1;
}
if (ncols == 2) {
column = db_get_table_column(table, 1);
type = db_sqltype_to_Ctype(db_get_column_sqltype(column));
G_debug(3, " col type = %d", type);
/*
if ( type != DB_C_TYPE_INT && type != DB_C_TYPE_DOUBLE ) {
G_fatal_error ( "Column type not supported by db_select_to_array()" );
}
*/
}
cvarr->ctype = type;
/* fetch the data */
for (i = 0; i < nrows; i++) {
if (db_fetch(&cursor, DB_NEXT, &more) != DB_OK)
return (-1);
column = db_get_table_column(table, 0); /* first column */
value = db_get_column_value(column);
cvarr->value[i].cat = db_get_value_int(value);
if (ncols == 2) {
column = db_get_table_column(table, 1);
value = db_get_column_value(column);
}
cvarr->value[i].isNull = value->isNull;
switch (type) {
case (DB_C_TYPE_INT):
if (value->isNull)
cvarr->value[i].val.i = 0;
else
cvarr->value[i].val.i = db_get_value_int(value);
break;
case (DB_C_TYPE_DOUBLE):
if (value->isNull)
cvarr->value[i].val.d = 0.0;
else
cvarr->value[i].val.d = db_get_value_double(value);
break;
case (DB_C_TYPE_STRING):
cvarr->value[i].val.s = (dbString *) malloc(sizeof(dbString));
db_init_string(cvarr->value[i].val.s);
if (!(value->isNull))
db_set_string(cvarr->value[i].val.s,
db_get_value_string(value));
break;
case (DB_C_TYPE_DATETIME):
cvarr->value[i].val.t =
(dbDateTime *) calloc(1, sizeof(dbDateTime));
if (!(value->isNull))
memcpy(cvarr->value[i].val.t, &(value->t),
sizeof(dbDateTime));
break;
default:
return (-1);
}
}
cvarr->n_values = nrows;
db_close_cursor(&cursor);
db_free_string(&stmt);
db_CatValArray_sort(cvarr);
return nrows;
}
/*!
\brief Sort key/value array by key
\param[in,out] arr dbCatValArray (key/value array)
*/
void db_CatValArray_sort(dbCatValArray * arr)
{
qsort((void *)arr->value, arr->n_values, sizeof(dbCatVal), cmpcat);
}
/*!
\brief Sort key/value array by value
\param[in,out] arr dbCatValArray (key/value array)
\return DB_OK on success
\return DB_FAILED on error
*/
int db_CatValArray_sort_by_value(dbCatValArray * arr)
{
switch (arr->ctype) {
case (DB_C_TYPE_INT):
qsort((void *)arr->value, arr->n_values, sizeof(dbCatVal),
cmpvalueint);
break;
case (DB_C_TYPE_DOUBLE):
qsort((void *)arr->value, arr->n_values, sizeof(dbCatVal),
cmpvaluedouble);
break;
case (DB_C_TYPE_STRING):
qsort((void *)arr->value, arr->n_values, sizeof(dbCatVal),
cmpvaluestring);
break;
case (DB_C_TYPE_DATETIME): /* is cmpvaluestring right here ? */
qsort((void *)arr->value, arr->n_values, sizeof(dbCatVal),
cmpvaluestring);
break;
default:
return (DB_FAILED);
}
return (DB_OK);
}
/*!
\brief Find value by key
\param arr dbCatValArray (key/value array)
\param key key value
\param[out] cv dbCatVal structure (key/value) to store within
\return DB_OK on success
\return DB_FAILED on error
*/
int db_CatValArray_get_value(dbCatValArray * arr, int key, dbCatVal ** cv)
{
dbCatVal *catval;
catval =
bsearch((void *)&key, arr->value, arr->n_values, sizeof(dbCatVal),
cmpcat);
if (catval == NULL) {
return DB_FAILED;
}
*cv = catval;
return DB_OK;
}
/*!
\brief Find value (integer) by key
\param arr dbCatValArray (key/value array)
\param key key value
\param[out] val found value (integer)
\return DB_OK on success
\return DB_FAILED on error
*/
int db_CatValArray_get_value_int(dbCatValArray * arr, int key, int *val)
{
dbCatVal *catval;
catval =
bsearch((void *)&key, arr->value, arr->n_values, sizeof(dbCatVal),
cmpcat);
if (catval == NULL) {
return DB_FAILED;
}
*val = catval->val.i;
return DB_OK;
}
/*!
\brief Find value (double) by key
\param arr dbCatValArray (key/value array)
\param key key value
\param[out] val found value (double)
\return DB_OK on success
\return DB_FAILED on error
*/
int db_CatValArray_get_value_double(dbCatValArray * arr, int key, double *val)
{
dbCatVal *catval;
G_debug(3, "db_CatValArray_get_value_double(), key = %d", key);
catval =
bsearch((void *)&key, arr->value, arr->n_values, sizeof(dbCatVal),
cmpcatkey);
if (catval == NULL) {
return DB_FAILED;
}
*val = catval->val.d;
return DB_OK;
}