-
Notifications
You must be signed in to change notification settings - Fork 205
/
backend.c
1164 lines (1069 loc) · 37.6 KB
/
backend.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
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
/* MDB Tools - A library for reading MS Access database files
* Copyright (C) 2000-2011 Brian Bruns and others
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
** functions to deal with different backend database engines
*/
#include "mdbtools.h"
#include "mdbprivate.h"
/* Access data types */
static const MdbBackendType mdb_access_types[] = {
[MDB_BOOL] = { .name = "Boolean" },
[MDB_BYTE] = { .name = "Byte" },
[MDB_INT] = { .name = "Integer" },
[MDB_LONGINT] = { .name = "Long Integer" },
[MDB_MONEY] = { .name = "Currency" },
[MDB_FLOAT] = { .name = "Single" },
[MDB_DOUBLE] = { .name = "Double" },
[MDB_DATETIME] = { .name = "DateTime" },
[MDB_BINARY] = { .name = "Binary" },
[MDB_TEXT] = { .name = "Text", .needs_char_length = 1 },
[MDB_OLE] = { .name = "OLE", .needs_byte_length = 1 },
[MDB_MEMO] = { .name = "Memo/Hyperlink", .needs_char_length = 1 },
[MDB_REPID] = { .name = "Replication ID" },
[MDB_NUMERIC] = { .name = "Numeric", .needs_precision = 1, .needs_scale = 1 },
};
/* Oracle data types */
static const MdbBackendType mdb_oracle_types[] = {
[MDB_BOOL] = { .name = "NUMBER(1)" },
[MDB_BYTE] = { .name = "NUMBER(3)" },
[MDB_INT] = { .name = "NUMBER(5)" },
[MDB_LONGINT] = { .name = "NUMBER(11)" },
[MDB_MONEY] = { .name = "NUMBER(15,2)" },
[MDB_FLOAT] = { .name = "FLOAT" },
[MDB_DOUBLE] = { .name = "FLOAT" },
[MDB_DATETIME] = { .name = "TIMESTAMP" },
[MDB_BINARY] = { .name = "BINARY" },
[MDB_TEXT] = { .name = "VARCHAR2", .needs_char_length= 1 },
[MDB_OLE] = { .name = "BLOB" },
[MDB_MEMO] = { .name = "CLOB" },
[MDB_REPID] = { .name = "NUMBER", .needs_precision = 1 },
[MDB_NUMERIC] = { .name = "NUMBER", .needs_precision = 1 },
};
static const MdbBackendType mdb_oracle_shortdate_type =
{ .name = "DATE" };
/* Sybase/MSSQL data types */
static const MdbBackendType mdb_sybase_types[] = {
[MDB_BOOL] = { .name = "bit" },
[MDB_BYTE] = { .name = "char", .needs_byte_length = 1 },
[MDB_INT] = { .name = "smallint" },
[MDB_LONGINT] = { .name = "int" },
[MDB_MONEY] = { .name = "money" },
[MDB_FLOAT] = { .name = "real" },
[MDB_DOUBLE] = { .name = "float" },
[MDB_DATETIME] = { .name = "smalldatetime" },
[MDB_BINARY] = { .name = "varbinary", .needs_byte_length = 1 },
[MDB_TEXT] = { .name = "nvarchar", .needs_char_length = 1 },
[MDB_OLE] = { .name = "varbinary(max)" },
[MDB_MEMO] = { .name = "nvarchar(max)" },
[MDB_REPID] = { .name = "Sybase_Replication ID" },
[MDB_NUMERIC] = { .name = "numeric", .needs_precision = 1, .needs_scale = 1 },
};
static const MdbBackendType mdb_sybase_shortdate_type =
{ .name = "DATE" };
/* Postgres data types */
static const MdbBackendType mdb_postgres_types[] = {
[MDB_BOOL] = { .name = "BOOLEAN" },
[MDB_BYTE] = { .name = "SMALLINT" },
[MDB_INT] = { .name = "INTEGER" },
[MDB_LONGINT] = { .name = "INTEGER" }, /* bigint */
[MDB_MONEY] = { .name = "NUMERIC(15,2)" }, /* money deprecated ? */
[MDB_FLOAT] = { .name = "REAL" },
[MDB_DOUBLE] = { .name = "DOUBLE PRECISION" },
[MDB_DATETIME] = { .name = "TIMESTAMP WITHOUT TIME ZONE" },
[MDB_BINARY] = { .name = "BYTEA" },
[MDB_TEXT] = { .name = "VARCHAR", .needs_char_length = 1 },
[MDB_OLE] = { .name = "BYTEA" },
[MDB_MEMO] = { .name = "TEXT" },
[MDB_REPID] = { .name = "UUID" },
[MDB_NUMERIC] = { .name = "NUMERIC", .needs_precision = 1, .needs_scale = 1 },
};
static const MdbBackendType mdb_postgres_shortdate_type =
{ .name = "DATE" };
static const MdbBackendType mdb_postgres_serial_type =
{ .name = "SERIAL" };
/* MySQL data types */
static const MdbBackendType mdb_mysql_types[] = {
[MDB_BOOL] = { .name = "boolean" },
[MDB_BYTE] = { .name = "tinyint" },
[MDB_INT] = { .name = "smallint" },
[MDB_LONGINT] = { .name = "int" },
[MDB_MONEY] = { .name = "float" },
[MDB_FLOAT] = { .name = "float" },
[MDB_DOUBLE] = { .name = "double" },
[MDB_DATETIME] = { .name = "datetime" },
[MDB_BINARY] = { .name = "blob" },
[MDB_TEXT] = { .name = "varchar", .needs_char_length = 1 },
[MDB_OLE] = { .name = "blob" },
[MDB_MEMO] = { .name = "text" },
[MDB_REPID] = { .name = "char(38)" },
[MDB_NUMERIC] = { .name = "numeric", .needs_precision = 1, .needs_scale = 1 },
};
static const MdbBackendType mdb_mysql_shortdate_type =
{ .name = "date" };
/* We can't use the MySQL SERIAL type because that uses a bigint which
* is 64 bits wide, whereas MDB long ints are 32 bits */
static const MdbBackendType mdb_mysql_serial_type =
{ .name = "int not null auto_increment unique" };
/* sqlite data types */
static const MdbBackendType mdb_sqlite_types[] = {
[MDB_BOOL] = { .name = "INTEGER" },
[MDB_BYTE] = { .name = "INTEGER" },
[MDB_INT] = { .name = "INTEGER" },
[MDB_LONGINT] = { .name = "INTEGER" },
[MDB_MONEY] = { .name = "REAL" },
[MDB_FLOAT] = { .name = "REAL" },
[MDB_DOUBLE] = { .name = "REAL" },
[MDB_DATETIME] = { .name = "DateTime" },
[MDB_BINARY] = { .name = "BLOB" },
[MDB_TEXT] = { .name = "varchar" },
[MDB_OLE] = { .name = "BLOB" },
[MDB_MEMO] = { .name = "TEXT" },
[MDB_REPID] = { .name = "INTEGER" },
[MDB_NUMERIC] = { .name = "INTEGER" },
};
enum {
MDB_BACKEND_ACCESS = 1,
MDB_BACKEND_ORACLE,
MDB_BACKEND_SYBASE,
MDB_BACKEND_POSTGRES,
MDB_BACKEND_MYSQL,
MDB_BACKEND_SQLITE,
};
static void mdb_drop_backend(gpointer key, gpointer value, gpointer data);
static gchar *passthrough_unchanged(const gchar *str) {
return (gchar *)str;
}
static gchar *to_lower_case(const gchar *str) {
return g_utf8_strdown(str, -1);
}
/**
* Convenience function to replace an input string with its database specific normalised version.
*
* This function throws away the input string after normalisation, freeing its memory, and replaces it with a new
* normalised version allocated on the stack.
*
* @param mdb Database specific MDB handle containing pointers to utility methods
* @param str string to normalise
* @return a pointer to the normalised version of the input string
*/
gchar *mdb_normalise_and_replace(MdbHandle *mdb, gchar **str) {
gchar *normalised_str = mdb->default_backend->normalise_case(*str);
if (normalised_str != *str) {
/* Free and replace the old string only and only if a new string was created at a different memory location
* so that we can account for the case where strings a just passed through unchanged.
*/
free(*str);
*str = normalised_str;
}
return *str;
}
static gchar*
quote_generic(const gchar *value, gchar quote_char, gchar escape_char) {
gchar *result, *pr;
unsigned char c;
pr = result = g_malloc(1+4*strlen(value)+2); // worst case scenario
*pr++ = quote_char;
while ((c=*(unsigned char*)value++)) {
if (c<32) {
sprintf(pr, "\\%03o", c);
pr+=4;
continue;
}
else if (c == quote_char) {
*pr++ = escape_char;
}
*pr++ = c;
}
*pr++ = quote_char;
*pr++ = '\0';
return result;
}
static gchar*
quote_schema_name_bracket_merge(const gchar* schema, const gchar *name) {
if (schema)
return g_strconcat("[", schema, "_", name, "]", NULL);
else
return g_strconcat("[", name, "]", NULL);
}
/*
* For backends that really does support schema
* returns "name" or "schema"."name"
*/
static gchar*
quote_schema_name_dquote(const gchar* schema, const gchar *name)
{
if (schema) {
gchar *frag1 = quote_generic(schema, '"', '"');
gchar *frag2 = quote_generic(name, '"', '"');
gchar *result = g_strconcat(frag1, ".", frag2, NULL);
g_free(frag1);
g_free(frag2);
return result;
}
return quote_generic(name, '"', '"');
}
/*
* For backends that really do NOT support schema
* returns "name" or "schema_name"
*/
/*
static gchar*
quote_schema_name_dquote_merge(const gchar* schema, const gchar *name)
{
if (schema) {
gchar *combined = g_strconcat(schema, "_", name, NULL);
gchar *result = quote_generic(combined, '"', '"');
g_free(combined);
return result;
}
return quote_generic(name, '"', '"');
}*/
static gchar*
quote_schema_name_rquotes_merge(const gchar* schema, const gchar *name)
{
if (schema) {
gchar *combined = g_strconcat(schema, "_", name, NULL);
gchar *result = quote_generic(combined, '`', '`');
g_free(combined);
return result;
}
return quote_generic(name, '`', '`');
}
static gchar*
quote_with_squotes(const gchar* value)
{
return quote_generic(value, '\'', '\'');
}
const MdbBackendType*
mdb_get_colbacktype(const MdbColumn *col) {
MdbBackend *backend = col->table->entry->mdb->default_backend;
int col_type = col->col_type;
if (col_type > MDB_NUMERIC)
return NULL;
if (col_type == MDB_LONGINT && col->is_long_auto && backend->type_autonum)
return backend->type_autonum;
if (col_type == MDB_DATETIME && backend->type_shortdate) {
if (mdb_col_is_shortdate(col))
return backend->type_shortdate;
}
if (!backend->types_table[col_type].name[0])
return NULL;
return &backend->types_table[col_type];
}
const char *
mdb_get_colbacktype_string(const MdbColumn *col)
{
const MdbBackendType *type = mdb_get_colbacktype(col);
if (!type) {
// return NULL;
static TLS char buf[16];
snprintf(buf, sizeof(buf), "Unknown_%04x", col->col_type);
return buf;
}
return type->name;
}
int
mdb_colbacktype_takes_length(const MdbColumn *col)
{
const MdbBackendType *type = mdb_get_colbacktype(col);
if (!type) return 0;
return type->needs_precision || type->needs_char_length || type->needs_byte_length;
}
static int
mdb_colbacktype_takes_length_in_characters(const MdbColumn *col)
{
const MdbBackendType *type = mdb_get_colbacktype(col);
if (!type) return 0;
return type->needs_char_length;
}
/**
* mdb_init_backends
*
* Initializes the mdb_backends hash and loads the builtin backends.
* Use mdb_remove_backends() to destroy this hash when done.
*/
void mdb_init_backends(MdbHandle *mdb)
{
if (mdb->backends) {
mdb_remove_backends(mdb);
}
mdb->backends = g_hash_table_new(g_str_hash, g_str_equal);
mdb_register_backend(mdb, "access",
MDB_SHEXP_DROPTABLE|MDB_SHEXP_CST_NOTNULL|MDB_SHEXP_DEFVALUES,
mdb_access_types, NULL, NULL,
"Date()", "Date()",
NULL,
NULL,
"-- That file uses encoding %s\n",
"DROP TABLE %s;\n",
NULL,
NULL,
NULL,
NULL,
NULL,
quote_schema_name_bracket_merge);
mdb_register_backend(mdb, "sybase",
MDB_SHEXP_DROPTABLE|MDB_SHEXP_CST_NOTNULL|MDB_SHEXP_CST_NOTEMPTY|MDB_SHEXP_COMMENTS|MDB_SHEXP_DEFVALUES,
mdb_sybase_types, &mdb_sybase_shortdate_type, NULL,
"getdate()", "getdate()",
NULL,
NULL,
"-- That file uses encoding %s\n",
"DROP TABLE %s;\n",
"ALTER TABLE %s ADD CHECK (%s <>'');\n",
"COMMENT ON COLUMN %s.%s IS %s;\n",
NULL,
"COMMENT ON TABLE %s IS %s;\n",
NULL,
quote_schema_name_dquote);
mdb_register_backend(mdb, "oracle",
MDB_SHEXP_DROPTABLE|MDB_SHEXP_CST_NOTNULL|MDB_SHEXP_COMMENTS|MDB_SHEXP_INDEXES|MDB_SHEXP_RELATIONS|MDB_SHEXP_DEFVALUES,
mdb_oracle_types, &mdb_oracle_shortdate_type, NULL,
"current_date", "sysdate",
NULL,
NULL,
"-- That file uses encoding %s\n",
"DROP TABLE %s;\n",
NULL,
"COMMENT ON COLUMN %s.%s IS %s;\n",
NULL,
"COMMENT ON TABLE %s IS %s;\n",
NULL,
quote_schema_name_dquote);
mdbi_register_backend2(mdb, "postgres",
MDB_SHEXP_DROPTABLE|MDB_SHEXP_CST_NOTNULL|MDB_SHEXP_CST_NOTEMPTY|MDB_SHEXP_COMMENTS|MDB_SHEXP_INDEXES|MDB_SHEXP_RELATIONS|MDB_SHEXP_DEFVALUES|MDB_SHEXP_BULK_INSERT,
mdb_postgres_types, &mdb_postgres_shortdate_type, &mdb_postgres_serial_type,
"current_date", "now()",
"%Y-%m-%d %H:%M:%S",
"%Y-%m-%d",
"SET client_encoding = '%s';\n",
"CREATE TABLE IF NOT EXISTS %s\n",
"DROP TABLE IF EXISTS %s;\n",
"ALTER TABLE %s ADD CHECK (%s <>'');\n",
"COMMENT ON COLUMN %s.%s IS %s;\n",
NULL,
"COMMENT ON TABLE %s IS %s;\n",
NULL,
quote_schema_name_dquote,
to_lower_case);
mdb_register_backend(mdb, "mysql",
MDB_SHEXP_DROPTABLE|MDB_SHEXP_CST_NOTNULL|MDB_SHEXP_CST_NOTEMPTY|MDB_SHEXP_INDEXES|MDB_SHEXP_RELATIONS|MDB_SHEXP_DEFVALUES|MDB_SHEXP_BULK_INSERT,
mdb_mysql_types, &mdb_mysql_shortdate_type, &mdb_mysql_serial_type,
"current_date", "now()",
"%Y-%m-%d %H:%M:%S",
"%Y-%m-%d",
"-- That file uses encoding %s\n",
"DROP TABLE IF EXISTS %s;\n",
"ALTER TABLE %s ADD CHECK (%s <>'');\n",
NULL,
"COMMENT %s",
NULL,
"COMMENT %s",
quote_schema_name_rquotes_merge);
mdb_register_backend(mdb, "sqlite",
MDB_SHEXP_DROPTABLE|MDB_SHEXP_DEFVALUES|MDB_SHEXP_BULK_INSERT,
mdb_sqlite_types, NULL, NULL,
"date('now')", "date('now')",
"%Y-%m-%d %H:%M:%S",
"%Y-%m-%d",
"-- That file uses encoding %s\n",
"DROP TABLE IF EXISTS %s;\n",
NULL,
NULL,
NULL,
NULL,
NULL,
quote_schema_name_rquotes_merge);
}
MdbBackend *mdbi_register_backend2(MdbHandle *mdb, char *backend_name, guint32 capabilities,
const MdbBackendType *backend_type, const MdbBackendType *type_shortdate, const MdbBackendType *type_autonum,
const char *short_now, const char *long_now,
const char *date_fmt, const char *shortdate_fmt,
const char *charset_statement,
const char *create_table_statement,
const char *drop_statement,
const char *constraint_not_empty_statement,
const char *column_comment_statement,
const char *per_column_comment_statement,
const char *table_comment_statement,
const char *per_table_comment_statement,
gchar* (*quote_schema_name)(const gchar*, const gchar*),
gchar* (*normalise_case)(const gchar*)) {
MdbBackend *backend = g_malloc0(sizeof(MdbBackend));
backend->capabilities = capabilities;
backend->types_table = backend_type;
backend->type_shortdate = type_shortdate;
backend->type_autonum = type_autonum;
backend->short_now = short_now;
backend->long_now = long_now;
backend->date_fmt = date_fmt;
backend->shortdate_fmt = shortdate_fmt;
backend->charset_statement = charset_statement;
backend->create_table_statement = create_table_statement;
backend->drop_statement = drop_statement;
backend->constaint_not_empty_statement = constraint_not_empty_statement;
backend->column_comment_statement = column_comment_statement;
backend->per_column_comment_statement = per_column_comment_statement;
backend->table_comment_statement = table_comment_statement;
backend->per_table_comment_statement = per_table_comment_statement;
backend->quote_schema_name = quote_schema_name;
backend->normalise_case = normalise_case;
g_hash_table_insert(mdb->backends, backend_name, backend);
return backend;
}
void mdb_register_backend(MdbHandle *mdb, char *backend_name, guint32 capabilities,
const MdbBackendType *backend_type, const MdbBackendType *type_shortdate, const MdbBackendType *type_autonum,
const char *short_now, const char *long_now,
const char *date_fmt, const char *shortdate_fmt,
const char *charset_statement,
const char *drop_statement,
const char *constraint_not_empty_statement,
const char *column_comment_statement,
const char *per_column_comment_statement,
const char *table_comment_statement,
const char *per_table_comment_statement,
gchar* (*quote_schema_name)(const gchar*, const gchar*))
{
mdbi_register_backend2(mdb, backend_name, capabilities,
backend_type, type_shortdate, type_autonum,
short_now, long_now,
date_fmt, shortdate_fmt,
charset_statement,
"CREATE TABLE %s\n",
drop_statement,
constraint_not_empty_statement,
column_comment_statement,
per_column_comment_statement,
table_comment_statement,
per_table_comment_statement,
quote_schema_name,
passthrough_unchanged);
}
/**
* mdb_remove_backends
*
* Removes all entries from and destroys the mdb_backends hash.
*/
void
mdb_remove_backends(MdbHandle *mdb)
{
g_hash_table_foreach(mdb->backends, mdb_drop_backend, NULL);
g_hash_table_destroy(mdb->backends);
}
static void mdb_drop_backend(gpointer key, gpointer value, gpointer data)
{
MdbBackend *backend = (MdbBackend *)value;
g_free (backend);
}
/**
* mdb_set_default_backend
* @mdb: Handle to open MDB database file
* @backend_name: Name of the backend to set as default
*
* Sets the default backend of the handle @mdb to @backend_name.
*
* Returns: 1 if successful, 0 if unsuccessful.
*/
int mdb_set_default_backend(MdbHandle *mdb, const char *backend_name)
{
MdbBackend *backend;
if (!mdb->backends) {
mdb_init_backends(mdb);
}
backend = (MdbBackend *) g_hash_table_lookup(mdb->backends, backend_name);
if (backend) {
mdb->default_backend = backend;
g_free(mdb->backend_name); // NULL is ok
mdb->backend_name = (char *) g_strdup(backend_name);
mdb->relationships_table = NULL;
if (backend->date_fmt) {
mdb_set_date_fmt(mdb, backend->date_fmt);
} else {
mdb_set_date_fmt(mdb, "%x %X");
}
if (backend->shortdate_fmt) {
mdb_set_shortdate_fmt(mdb, backend->shortdate_fmt);
} else {
mdb_set_shortdate_fmt(mdb, "%x");
}
}
return (backend != NULL);
}
/**
* Generates index name based on backend.
*
* You should free() the returned value once you are done with it.
*
* @param backend backend we are generating indexes for
* @param table table being processed
* @param idx index being processed
* @return the index name
*/
static char *
mdb_get_index_name(int backend, MdbTableDef *table, MdbIndex *idx)
{
char *index_name;
switch(backend){
case MDB_BACKEND_MYSQL:
// appending table name to index often makes it too long for mysql
if (idx->index_type==1)
// for mysql name of primary key is not used
index_name = g_strdup("_pkey");
else {
index_name = g_strdup(idx->name);
}
break;
default:
if (idx->index_type==1)
index_name = g_strconcat(table->name, "_pkey", NULL);
else {
index_name = g_strconcat(table->name, "_", idx->name, "_idx", NULL);
}
}
return index_name;
}
/**
* mdb_print_indexes
* @output: Where to print the sql
* @table: Table to process
* @dbnamespace: Target namespace/schema name
*/
static void
mdb_print_indexes(FILE* outfile, MdbTableDef *table, char *dbnamespace)
{
unsigned int i, j;
char* quoted_table_name;
char* index_name;
char* quoted_name;
int backend;
MdbHandle* mdb = table->entry->mdb;
MdbIndex *idx;
MdbColumn *col;
if (!strcmp(mdb->backend_name, "postgres")) {
backend = MDB_BACKEND_POSTGRES;
} else if (!strcmp(mdb->backend_name, "mysql")) {
backend = MDB_BACKEND_MYSQL;
} else if (!strcmp(mdb->backend_name, "oracle")) {
backend = MDB_BACKEND_ORACLE;
} else {
fprintf(outfile, "-- Indexes are not implemented for %s\n\n", mdb->backend_name);
return;
}
/* read indexes */
mdb_read_indices(table);
fprintf (outfile, "-- CREATE INDEXES ...\n");
quoted_table_name = mdb->default_backend->quote_schema_name(dbnamespace, table->name);
quoted_table_name = mdb->default_backend->normalise_case(quoted_table_name);
for (i=0;i<table->num_idxs;i++) {
idx = g_ptr_array_index (table->indices, i);
if (idx->index_type==2)
continue;
index_name = mdb_get_index_name(backend, table, idx);
switch (backend) {
case MDB_BACKEND_POSTGRES:
/* PostgreSQL index and constraint names are
* never namespaced in DDL (they are always
* created in same namespace as table), so
* omit namespace.
*/
quoted_name = mdb->default_backend->quote_schema_name(NULL, index_name);
break;
default:
quoted_name = mdb->default_backend->quote_schema_name(dbnamespace, index_name);
}
quoted_name = mdb_normalise_and_replace(mdb, "ed_name);
if (idx->index_type==1) {
switch (backend) {
case MDB_BACKEND_ORACLE:
case MDB_BACKEND_POSTGRES:
fprintf (outfile, "ALTER TABLE %s ADD CONSTRAINT %s PRIMARY KEY (", quoted_table_name, quoted_name);
break;
case MDB_BACKEND_MYSQL:
fprintf (outfile, "ALTER TABLE %s ADD PRIMARY KEY (", quoted_table_name);
break;
}
} else {
switch (backend) {
case MDB_BACKEND_ORACLE:
case MDB_BACKEND_POSTGRES:
fprintf(outfile, "CREATE");
if (idx->flags & MDB_IDX_UNIQUE)
fprintf (outfile, " UNIQUE");
fprintf(outfile, " INDEX %s ON %s (", quoted_name, quoted_table_name);
break;
case MDB_BACKEND_MYSQL:
fprintf(outfile, "ALTER TABLE %s ADD", quoted_table_name);
if (idx->flags & MDB_IDX_UNIQUE)
fprintf (outfile, " UNIQUE");
fprintf(outfile, " INDEX %s (", quoted_name);
break;
}
}
g_free(quoted_name);
free(index_name);
for (j=0;j<idx->num_keys;j++) {
if (j)
fprintf(outfile, ", ");
col=g_ptr_array_index(table->columns,idx->key_col_num[j]-1);
quoted_name = mdb->default_backend->quote_schema_name(NULL, col->name);
quoted_name = mdb_normalise_and_replace(mdb, "ed_name);
fprintf (outfile, "%s", quoted_name);
if (idx->index_type!=1 && idx->key_col_order[j])
/* no DESC for primary keys */
fprintf(outfile, " DESC");
g_free(quoted_name);
}
fprintf (outfile, ");\n");
}
fputc ('\n', outfile);
g_free(quoted_table_name);
}
/**
* mdb_get_relationships
* @mdb: Handle to open MDB database file
* @tablename: Name of the table to process. Process all tables if NULL.
*
* Generates relationships by reading the MSysRelationships table.
* 'szColumn' contains the column name of the child table.
* 'szObject' contains the table name of the child table.
* 'szReferencedColumn' contains the column name of the parent table.
* 'szReferencedObject' contains the table name of the parent table.
* 'grbit' contains integrity constraints.
*
* Returns: a string stating that relationships are not supported for the
* selected backend, or a string containing SQL commands for setting up
* the relationship, tailored for the selected backend.
* Returns NULL on last iteration.
* The caller is responsible for freeing this string.
*/
static char *
mdb_get_relationships(MdbHandle *mdb, const gchar *dbnamespace, const char* tablename)
{
unsigned int i;
gchar *text = NULL; /* String to be returned */
char **bound = mdb->relationships_values; /* Bound values */
int backend = 0;
char *quoted_table_1, *quoted_column_1,
*quoted_table_2, *quoted_column_2,
*constraint_name, *quoted_constraint_name;
long grbit;
if (!strcmp(mdb->backend_name, "oracle")) {
backend = MDB_BACKEND_ORACLE;
} else if (!strcmp(mdb->backend_name, "postgres")) {
backend = MDB_BACKEND_POSTGRES;
} else if (!strcmp(mdb->backend_name, "mysql")) {
backend = MDB_BACKEND_MYSQL;
} else if (!mdb->relationships_table) {
return NULL;
}
if (!mdb->relationships_table) {
mdb->relationships_table = mdb_read_table_by_name(mdb, "MSysRelationships", MDB_TABLE);
if (!mdb->relationships_table || !mdb->relationships_table->num_rows) {
fprintf(stderr, "No MSysRelationships\n");
return NULL;
}
if (!mdb_read_columns(mdb->relationships_table)) {
fprintf(stderr, "Unable to read columns of MSysRelationships\n");
return NULL;
}
for (i=0;i<5;i++) {
bound[i] = g_malloc0(mdb->bind_size);
}
mdb_bind_column_by_name(mdb->relationships_table, "szColumn", bound[0], NULL);
mdb_bind_column_by_name(mdb->relationships_table, "szObject", bound[1], NULL);
mdb_bind_column_by_name(mdb->relationships_table, "szReferencedColumn", bound[2], NULL);
mdb_bind_column_by_name(mdb->relationships_table, "szReferencedObject", bound[3], NULL);
mdb_bind_column_by_name(mdb->relationships_table, "grbit", bound[4], NULL);
mdb_rewind_table(mdb->relationships_table);
}
if (mdb->relationships_table->cur_row >= mdb->relationships_table->num_rows) { /* past the last row */
for (i=0;i<5;i++)
g_free(bound[i]);
mdb->relationships_table = NULL;
return NULL;
}
while (1) {
if (!mdb_fetch_row(mdb->relationships_table)) {
for (i=0;i<5;i++)
g_free(bound[i]);
mdb->relationships_table = NULL;
return NULL;
}
if (!tablename || !strcmp(bound[1], tablename))
break;
}
quoted_table_1 = mdb->default_backend->quote_schema_name(dbnamespace, bound[1]);
quoted_table_2 = mdb->default_backend->quote_schema_name(dbnamespace, bound[3]);
grbit = atoi(bound[4]);
constraint_name = g_strconcat(bound[1], "_", bound[0], "_fk", NULL);
switch (backend) {
case MDB_BACKEND_POSTGRES:
/* PostgreSQL index and constraint names are
* never namespaced in DDL (they are always
* created in same namespace as table), so
* omit namespace. Nor should column names
* be namespaced.
*/
quoted_constraint_name = mdb->default_backend->quote_schema_name(NULL, constraint_name);
quoted_constraint_name = mdb_normalise_and_replace(mdb, "ed_constraint_name);
quoted_column_1 = mdb->default_backend->quote_schema_name(NULL, bound[0]);
quoted_column_1 = mdb_normalise_and_replace(mdb, "ed_column_1);
quoted_column_2 = mdb->default_backend->quote_schema_name(NULL, bound[2]);
quoted_column_2 = mdb_normalise_and_replace(mdb, "ed_column_2);
break;
default:
/* Other databases, namespace constraint and
* column names.
*/
quoted_constraint_name = mdb->default_backend->quote_schema_name(dbnamespace, constraint_name);
quoted_column_1 = mdb->default_backend->quote_schema_name(dbnamespace, bound[0]);
quoted_column_2 = mdb->default_backend->quote_schema_name(dbnamespace, bound[2]);
break;
}
g_free(constraint_name);
if (grbit & 0x00000002) {
text = g_strconcat(
"-- Relationship from ", quoted_table_1,
" (", quoted_column_1, ")"
" to ", quoted_table_2, "(", quoted_column_2, ")",
" does not enforce integrity.\n", NULL);
} else {
switch (backend) {
case MDB_BACKEND_ORACLE:
text = g_strconcat(
"ALTER TABLE ", quoted_table_1,
" ADD CONSTRAINT ", quoted_constraint_name,
" FOREIGN KEY (", quoted_column_1, ")"
" REFERENCES ", quoted_table_2, "(", quoted_column_2, ")",
(grbit & 0x00001000) ? " ON DELETE CASCADE" : "",
";\n", NULL);
break;
case MDB_BACKEND_MYSQL:
text = g_strconcat(
"ALTER TABLE ", quoted_table_1,
" ADD CONSTRAINT ", quoted_constraint_name,
" FOREIGN KEY (", quoted_column_1, ")"
" REFERENCES ", quoted_table_2, "(", quoted_column_2, ")",
(grbit & 0x00000100) ? " ON UPDATE CASCADE" : "",
(grbit & 0x00001000) ? " ON DELETE CASCADE" : "",
";\n", NULL);
break;
case MDB_BACKEND_POSTGRES:
text = g_strconcat(
"ALTER TABLE ", quoted_table_1,
" ADD CONSTRAINT ", quoted_constraint_name,
" FOREIGN KEY (", quoted_column_1, ")"
" REFERENCES ", quoted_table_2, "(", quoted_column_2, ")",
(grbit & 0x00000100) ? " ON UPDATE CASCADE" : "",
(grbit & 0x00001000) ? " ON DELETE CASCADE" : "",
/* On some databases (eg PostgreSQL) we also want to set
* the constraints to be optionally deferrable, to
* facilitate out of order bulk loading.
*/
" DEFERRABLE",
" INITIALLY IMMEDIATE",
";\n", NULL);
break;
}
}
g_free(quoted_table_1);
g_free(quoted_column_1);
g_free(quoted_table_2);
g_free(quoted_column_2);
g_free(quoted_constraint_name);
return (char *)text;
}
static void
generate_table_schema(FILE *outfile, MdbCatalogEntry *entry, char *dbnamespace, guint32 export_options)
{
MdbTableDef *table;
MdbHandle *mdb = entry->mdb;
MdbColumn *col;
unsigned int i;
char* quoted_table_name;
char* quoted_name;
MdbProperties *props;
const char *prop_value;
quoted_table_name = mdb->default_backend->quote_schema_name(dbnamespace, entry->object_name);
quoted_table_name = mdb_normalise_and_replace(mdb, "ed_table_name);
/* drop the table if it exists */
if (export_options & MDB_SHEXP_DROPTABLE)
fprintf (outfile, mdb->default_backend->drop_statement, quoted_table_name);
/* create the table */
fprintf (outfile, mdb->default_backend->create_table_statement, quoted_table_name);
fprintf (outfile, " (\n");
table = mdb_read_table (entry);
if (!table) {
fprintf(stderr, "Error: Table %s does not exist\n", entry->object_name);
return;
}
/* get the columns */
mdb_read_columns(table);
/* loop over the columns, dumping the names and types */
for (i = 0; i < table->num_cols; i++) {
col = g_ptr_array_index (table->columns, i);
quoted_name = mdb->default_backend->quote_schema_name(NULL, col->name);
quoted_name = mdb_normalise_and_replace(mdb, "ed_name);
fprintf (outfile, "\t%s\t\t\t%s", quoted_name,
mdb_get_colbacktype_string (col));
g_free(quoted_name);
if (mdb_colbacktype_takes_length(col)) {
/* more portable version from DW patch */
if (col->col_size == 0)
fputs(" (255)", outfile);
else if (col->col_scale != 0)
fprintf(outfile, " (%d, %d)", col->col_scale, col->col_prec);
else if (!IS_JET3(mdb) && mdb_colbacktype_takes_length_in_characters(col))
fprintf(outfile, " (%d)", col->col_size/2);
else
fprintf(outfile, " (%d)", col->col_size);
}
if (mdb->default_backend->per_column_comment_statement && export_options & MDB_SHEXP_COMMENTS) {
prop_value = mdb_col_get_prop(col, "Description");
if (prop_value) {
char *comment = quote_with_squotes(prop_value);
fputs(" ", outfile);
fprintf(outfile,
mdb->default_backend->per_column_comment_statement,
comment);
free(comment);
}
}
if (export_options & MDB_SHEXP_CST_NOTNULL) {
if (col->col_type == MDB_BOOL) {
/* access booleans are never null */
fputs(" NOT NULL", outfile);
} else {
const gchar *not_null = mdb_col_get_prop(col, "Required");
if (not_null && not_null[0]=='y')
fputs(" NOT NULL", outfile);
}
}
if (export_options & MDB_SHEXP_DEFVALUES) {
int done = 0;
if (col->props) {
gchar *defval = g_hash_table_lookup(col->props->hash, "DefaultValue");
if (defval) {
size_t def_len = strlen(defval);
fputs(" DEFAULT ", outfile);
/* ugly hack to detect the type */
if (defval[0]=='"' && defval[def_len-1]=='"') {
/* this is a string */
gchar *output_default = malloc(def_len-1);
gchar *output_default_escaped;
memcpy(output_default, defval+1, def_len-2);
output_default[def_len-2] = 0;
output_default_escaped = quote_with_squotes(output_default);
fputs(output_default_escaped, outfile);
g_free(output_default_escaped);
free(output_default);
} else if (!strcmp(defval, "Yes"))
fputs("TRUE", outfile);
else if (!strcmp(defval, "No"))
fputs("FALSE", outfile);
else if (!g_ascii_strcasecmp(defval, "date()")) {
if (mdb_col_is_shortdate(col))
fputs(mdb->default_backend->short_now, outfile);
else
fputs(mdb->default_backend->long_now, outfile);
}
else
fputs(defval, outfile);
done = 1;
}
}
if (!done && col->col_type == MDB_BOOL)
/* access booleans are false by default */
fputs(" DEFAULT FALSE", outfile);
}
if (i < table->num_cols - 1)
fputs(", \n", outfile);
else
fputs("\n", outfile);
} /* for */
fputs(")", outfile);
if (mdb->default_backend->per_table_comment_statement && export_options & MDB_SHEXP_COMMENTS) {
prop_value = mdb_table_get_prop(table, "Description");
if (prop_value) {
char *comment = quote_with_squotes(prop_value);
fputs(" ", outfile);
fprintf(outfile, mdb->default_backend->per_table_comment_statement, comment);
free(comment);
}
}
fputs(";\n", outfile);
/* Add the constraints on columns */
for (i = 0; i < table->num_cols; i++) {
col = g_ptr_array_index (table->columns, i);
props = col->props;
if (!props)
continue;
quoted_name = mdb->default_backend->quote_schema_name(NULL, col->name);
quoted_name = mdb_normalise_and_replace(mdb, "ed_name);
if (export_options & MDB_SHEXP_CST_NOTEMPTY) {
prop_value = mdb_col_get_prop(col, "AllowZeroLength");
if (prop_value && prop_value[0]=='n')
fprintf(outfile,
mdb->default_backend->constaint_not_empty_statement,
quoted_table_name, quoted_name);
}