summaryrefslogtreecommitdiffstats
path: root/Bugzilla/DB/Schema.pm
blob: 99f5f106fd8bb185d33d3e55e2f9874792989782 (plain)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
# -*- Mode: perl; indent-tabs-mode: nil -*-
#
# The contents of this file are subject to the Mozilla Public
# License Version 1.1 (the "License"); you may not use this file
# except in compliance with the License. You may obtain a copy of
# the License at http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS
# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
# implied. See the License for the specific language governing
# rights and limitations under the License.
#
# The Original Code is the Bugzilla Bug Tracking System.
#
# The Initial Developer of the Original Code is Netscape Communications
# Corporation. Portions created by Netscape are
# Copyright (C) 1998 Netscape Communications Corporation. All
# Rights Reserved.
#
# Contributor(s): Andrew Dunstan <andrew@dunslane.net>,
#                 Edward J. Sabol <edwardjsabol@iname.com>

package Bugzilla::DB::Schema;

###########################################################################
#
# Purpose: Object-oriented, DBMS-independent database schema for Bugzilla
#
# This is the base class implementing common methods and abstract schema.
#
###########################################################################

use strict;
use Bugzilla::Error;
use Storable qw(dclone);

=head1 NAME

Bugzilla::DB::Schema - Abstract database schema for Bugzilla

=head1 SYNOPSIS

  # Obtain MySQL database schema.
  # Do not do this. Use Bugzilla::DB instead.
  use Bugzilla::DB::Schema;
  my $mysql_schema = new Bugzilla::DB::Schema('Mysql');

  # Recommended way to obtain database schema.
  use Bugzilla::DB;
  my $dbh = Bugzilla->dbh;
  my $schema = $dbh->_bz_schema();

  # Get the list of tables in the Bugzilla database.
  my @tables = $schema->get_table_list();

  # Get the SQL statements need to create the bugs table.
  my @statements = $schema->get_table_ddl('bugs');

  # Get the database-specific SQL data type used to implement
  # the abstract data type INT1.
  my $db_specific_type = $schema->sql_type('INT1');

=head1 DESCRIPTION

This module implements an object-oriented, abstract database schema.
It should be considered package-private to the Bugzilla::DB module.

=cut
#--------------------------------------------------------------------------
# Define the Bugzilla abstract database schema and version as constants.

=head1 CONSTANTS

=over 4

=item C<SCHEMA_VERSION>

The 'version' of the internal schema structure. This version number
is incremented every time the the fundamental structure of Schema
internals changes. 

This is NOT changed every time a table or a column is added. This 
number is incremented only if the internal structures of this 
Schema would be incompatible with the internal structures of a 
previous Schema version.

=begin undocumented

As a guideline for whether or not to change this version number,
you should think, "Will my changes make this structure fundamentally
incompatible with the old structure?" Think about serialization
of the data structures, because that's what this version number
is used for.

You should RARELY need to increment this version number.

=end undocumented

=item C<ABSTRACT_SCHEMA>

The abstract database schema structure consists of a hash reference
in which each key is the name of a table in the Bugzilla database.
The value for each key is a hash reference containing the keys
C<FIELDS> and C<INDEXES> which in turn point to array references
containing information on the table's fields and indexes. A field
hash reference should must contain the key C<TYPE>. Optional field
keys include C<PRIMARYKEY>, C<NOTNULL>, and C<DEFAULT>. The C<INDEXES>
array reference contains index names and information regarding the
index. If the index name points to an array reference, then the index
is a regular index and the array contains the indexed columns. If the
index name points to a hash reference, then the hash must contain
the key C<FIELDS>. It may also contain the key C<TYPE>, which can be
used to specify the type of index such as UNIQUE or FULLTEXT.

=back

=cut

use constant SCHEMA_VERSION  => '1.00';
use constant ABSTRACT_SCHEMA => {

    # BUG-RELATED TABLES
    # ------------------

    # General Bug Information
    # -----------------------
    bugs => {
        FIELDS => [
            bug_id              => {TYPE => 'MEDIUMSERIAL', NOTNULL => 1,
                                    PRIMARYKEY => 1},
            assigned_to         => {TYPE => 'INT3', NOTNULL => 1},
            bug_file_loc        => {TYPE => 'TEXT'},
            bug_severity        => {TYPE => 'varchar(64)', NOTNULL => 1},
            bug_status          => {TYPE => 'varchar(64)', NOTNULL => 1},
            creation_ts         => {TYPE => 'DATETIME', NOTNULL => 1},
            delta_ts            => {TYPE => 'DATETIME', NOTNULL => 1},
            short_desc          => {TYPE => 'MEDIUMTEXT', NOTNULL => 1},
            op_sys              => {TYPE => 'varchar(64)', NOTNULL => 1},
            priority            => {TYPE => 'varchar(64)', NOTNULL => 1},
            product_id          => {TYPE => 'INT2', NOTNULL => 1},
            rep_platform        => {TYPE => 'varchar(64)', NOTNULL => 1},
            reporter            => {TYPE => 'INT3', NOTNULL => 1},
            version             => {TYPE => 'varchar(64)', NOTNULL => 1},
            component_id        => {TYPE => 'INT2', NOTNULL => 1},
            resolution          => {TYPE => 'varchar(64)', NOTNULL => 1},
            target_milestone    => {TYPE => 'varchar(20)',
                                    NOTNULL => 1, DEFAULT => "'---'"},
            qa_contact          => {TYPE => 'INT3', NOTNULL => 1},
            status_whiteboard   => {TYPE => 'MEDIUMTEXT', NOTNULL => 1},
            votes               => {TYPE => 'INT3', NOTNULL => 1},
            # Note: keywords field is only a cache; the real data
            # comes from the keywords table
            keywords            => {TYPE => 'MEDIUMTEXT', NOTNULL => 1},
            lastdiffed          => {TYPE => 'DATETIME', NOTNULL => 1},
            everconfirmed       => {TYPE => 'BOOLEAN', NOTNULL => 1},
            reporter_accessible => {TYPE => 'BOOLEAN',
                                    NOTNULL => 1, DEFAULT => 'TRUE'},
            cclist_accessible   => {TYPE => 'BOOLEAN',
                                    NOTNULL => 1, DEFAULT => 'TRUE'},
            estimated_time      => {TYPE => 'decimal(5,2)',
                                    NOTNULL => 1, DEFAULT => '0'},
            remaining_time      => {TYPE => 'decimal(5,2)',
                                    NOTNULL => 1, DEFAULT => '0'},
            deadline            => {TYPE => 'DATETIME'},
            alias               => {TYPE => 'varchar(20)'},
        ],
        INDEXES => [
            bugs_unique_idx           => {FIELDS => ['alias'],
                                          TYPE => 'UNIQUE'},
            bugs_assigned_to_idx      => ['assigned_to'],
            bugs_creation_ts_idx      => ['creation_ts'],
            bugs_delta_ts_idx         => ['delta_ts'],
            bugs_bug_severity_idx     => ['bug_severity'],
            bugs_bug_status_idx       => ['bug_status'],
            bugs_op_sys_idx           => ['op_sys'],
            bugs_priority_idx         => ['priority'],
            bugs_product_id_idx       => ['product_id'],
            bugs_reporter_idx         => ['reporter'],
            bugs_version_idx          => ['version'],
            bugs_component_id_idx     => ['component_id'],
            bugs_resolution_idx       => ['resolution'],
            bugs_target_milestone_idx => ['target_milestone'],
            bugs_qa_contact_idx       => ['qa_contact'],
            bugs_votes_idx            => ['votes'],
            bugs_short_desc_idx       => {FIELDS => ['short_desc'],
                                          TYPE => 'FULLTEXT'},
        ],
    },

    bugs_activity => {
        FIELDS => [
            bug_id    => {TYPE => 'INT3', NOTNULL => 1},
            attach_id => {TYPE => 'INT3'},
            who       => {TYPE => 'INT3', NOTNULL => 1},
            bug_when  => {TYPE => 'DATETIME', NOTNULL => 1},
            fieldid   => {TYPE => 'INT3', NOTNULL => 1},
            added     => {TYPE => 'TINYTEXT'},
            removed   => {TYPE => 'TINYTEXT'},
        ],
        INDEXES => [
            bugs_activity_bugid_idx   => ['bug_id'],
            bugs_activity_who_idx     => ['who'],
            bugs_activity_bugwhen_idx => ['bug_when'],
            bugs_activity_fieldid_idx => ['fieldid'],
        ],
    },

    cc => {
        FIELDS => [
            bug_id => {TYPE => 'INT3', NOTNULL => 1},
            who    => {TYPE => 'INT3', NOTNULL => 1},
        ],
        INDEXES => [
            cc_unique_idx => {FIELDS => [qw(bug_id who)],
                              TYPE => 'UNIQUE'},
            cc_who_idx    => ['who'],
        ],
    },

    longdescs => {
        FIELDS => [
            bug_id          => {TYPE => 'INT3',  NOTNULL => 1},
            who             => {TYPE => 'INT3', NOTNULL => 1},
            bug_when        => {TYPE => 'DATETIME', NOTNULL => 1},
            work_time       => {TYPE => 'decimal(5,2)', NOTNULL => 1,
                                DEFAULT => '0'},
            thetext         => {TYPE => 'MEDIUMTEXT'},
            isprivate       => {TYPE => 'BOOLEAN', NOTNULL => 1,
                                DEFAULT => 'FALSE'},
            already_wrapped => {TYPE => 'BOOLEAN', NOTNULL => 1,
                                DEFAULT => 'FALSE'},
        ],
        INDEXES => [
            longdescs_bugid_idx   => ['bug_id'],
            longdescs_who_idx     => ['who'],
            longdescs_bugwhen_idx => ['bug_when'],
            longdescs_thetext_idx => {FIELDS => ['thetext'],
                                      TYPE => 'FULLTEXT'},
        ],
    },

    dependencies => {
        FIELDS => [
            blocked   => {TYPE => 'INT3', NOTNULL => 1},
            dependson => {TYPE => 'INT3', NOTNULL => 1},
        ],
        INDEXES => [
            dependencies_blocked_idx   => ['blocked'],
            dependencies_dependson_idx => ['dependson'],
        ],
    },

    votes => {
        FIELDS => [
            who        => {TYPE => 'INT3', NOTNULL => 1},
            bug_id     => {TYPE => 'INT3', NOTNULL => 1},
            vote_count => {TYPE => 'INT2', NOTNULL => 1},
        ],
        INDEXES => [
            votes_who_idx    => ['who'],
            votes_bug_id_idx => ['bug_id'],
        ],
    },

    attachments => {
        FIELDS => [
            attach_id    => {TYPE => 'MEDIUMSERIAL', NOTNULL => 1,
                             PRIMARYKEY => 1},
            bug_id       => {TYPE => 'INT3', NOTNULL => 1},
            creation_ts  => {TYPE => 'DATETIME', NOTNULL => 1},
            description  => {TYPE => 'MEDIUMTEXT', NOTNULL => 1},
            mimetype     => {TYPE => 'MEDIUMTEXT', NOTNULL => 1},
            ispatch      => {TYPE => 'BOOLEAN'},
            filename     => {TYPE => 'varchar(100)', NOTNULL => 1},
            thedata      => {TYPE => 'LONGBLOB', NOTNULL => 1},
            submitter_id => {TYPE => 'INT3', NOTNULL => 1},
            isobsolete   => {TYPE => 'BOOLEAN', NOTNULL => 1,
                             DEFAULT => 'FALSE'},
            isprivate    => {TYPE => 'BOOLEAN', NOTNULL => 1,
                             DEFAULT => 'FALSE'},
        ],
        INDEXES => [
            attachments_bug_id_idx => ['bug_id'],
            attachments_creation_ts_idx => ['creation_ts'],
        ],
    },

    duplicates => {
        FIELDS => [
            dupe_of => {TYPE => 'INT3', NOTNULL => 1},
            dupe    => {TYPE => 'INT3', NOTNULL => 1,
                       PRIMARYKEY => 1},
        ],
    },

    # Keywords
    # --------

    keyworddefs => {
        FIELDS => [
            id          => {TYPE => 'INT2', NOTNULL => 1,
                            PRIMARYKEY => 1},
            name        => {TYPE => 'varchar(64)', NOTNULL => 1},
            description => {TYPE => 'MEDIUMTEXT'},
        ],
        INDEXES => [
            keyworddefs_unique_idx => {FIELDS => ['name'],
                                       TYPE => 'UNIQUE'},
        ],
    },

    keywords => {
        FIELDS => [
            bug_id    => {TYPE => 'INT3', NOTNULL => 1},
            keywordid => {TYPE => 'INT2', NOTNULL => 1},
        ],
        INDEXES => [
            keywords_unique_idx    => {FIELDS => [qw(bug_id keywordid)],
                                       TYPE => 'UNIQUE'},
            keywords_keywordid_idx => ['keywordid'],
        ],
    },

    # Flags
    # -----

    # "flags" stores one record for each flag on each bug/attachment.
    flags => {
        FIELDS => [
            id                => {TYPE => 'INT3', NOTNULL => 1,
                                  PRIMARYKEY => 1},
            type_id           => {TYPE => 'INT2', NOTNULL => 1},
            status            => {TYPE => 'char(1)', NOTNULL => 1},
            bug_id            => {TYPE => 'INT3', NOTNULL => 1},
            attach_id         => {TYPE => 'INT3'},
            creation_date     => {TYPE => 'DATETIME', NOTNULL => 1},
            modification_date => {TYPE => 'DATETIME'},
            setter_id         => {TYPE => 'INT3'},
            requestee_id      => {TYPE => 'INT3'},
            is_active         => {TYPE => 'BOOLEAN', NOTNULL => 1,
                                  DEFAULT => 'TRUE'},
        ],
        INDEXES => [
            flags_bidattid_idx     => [qw(bug_id attach_id)],
            flags_setter_id_idx    => ['setter_id'],
            flags_requestee_id_idx => ['requestee_id'],
        ],
    },

    # "flagtypes" defines the types of flags that can be set.
    flagtypes => {
        FIELDS => [
            id               => {TYPE => 'INT2', NOTNULL => 1,
                                 PRIMARYKEY => 1},
            name             => {TYPE => 'varchar(50)', NOTNULL => 1},
            description      => {TYPE => 'TEXT'},
            cc_list          => {TYPE => 'varchar(200)'},
            target_type      => {TYPE => 'char(1)', NOTNULL => 1,
                                 DEFAULT => "'b'"},
            is_active        => {TYPE => 'BOOLEAN', NOTNULL => 1,
                                 DEFAULT => 'TRUE'},
            is_requestable   => {TYPE => 'BOOLEAN', NOTNULL => 1,
                                 DEFAULT => 'FALSE'},
            is_requesteeble  => {TYPE => 'BOOLEAN', NOTNULL => 1,
                                 DEFAULT => 'FALSE'},
            is_multiplicable => {TYPE => 'BOOLEAN', NOTNULL => 1,
                                 DEFAULT => 'FALSE'},
            sortkey          => {TYPE => 'INT2', NOTNULL => 1,
                                 DEFAULT => '0'},
            grant_group_id   => {TYPE => 'INT3'},
            request_group_id => {TYPE => 'INT3'},
        ],
    },

    # "flaginclusions" and "flagexclusions" specify the products/components
    #     a bug/attachment must belong to in order for flags of a given type
    #     to be set for them.
    flaginclusions => {
        FIELDS => [
            type_id      => {TYPE => 'INT2', NOTNULL => 1},
            product_id   => {TYPE => 'INT2'},
            component_id => {TYPE => 'INT2'},
        ],
        INDEXES => [
            flaginclusions_tpcid_idx =>
                [qw(type_id product_id component_id)],
        ],
    },

    flagexclusions => {
        FIELDS => [
            type_id      => {TYPE => 'INT2', NOTNULL => 1},
            product_id   => {TYPE => 'INT2'},
            component_id => {TYPE => 'INT2'},
        ],
        INDEXES => [
            flagexclusions_tpc_id_idx =>
                [qw(type_id product_id component_id)],
        ],
    },

    # General Field Information
    # -------------------------

    fielddefs => {
        FIELDS => [
            fieldid     => {TYPE => 'MEDIUMSERIAL', NOTNULL => 1,
                            PRIMARYKEY => 1},
            name        => {TYPE => 'varchar(64)', NOTNULL => 1},
            description => {TYPE => 'MEDIUMTEXT', NOTNULL => 1},
            mailhead    => {TYPE => 'BOOLEAN', NOTNULL => 1,
                            DEFAULT => 'FALSE'},
            sortkey     => {TYPE => 'INT2', NOTNULL => 1},
            obsolete    => {TYPE => 'BOOLEAN', NOTNULL => 1,
                            DEFAULT => 'FALSE'},
        ],
        INDEXES => [
            fielddefs_unique_idx  => {FIELDS => ['name'],
                                      TYPE => 'UNIQUE'},
            fielddefs_sortkey_idx => ['sortkey'],
        ],
    },

    # Per-product Field Values
    # ------------------------

    versions => {
        FIELDS => [
            value      =>  {TYPE => 'TINYTEXT'},
            product_id =>  {TYPE => 'INT2', NOTNULL => 1},
        ],
    },

    milestones => {
        FIELDS => [
            product_id => {TYPE => 'INT2', NOTNULL => 1},
            value      => {TYPE => 'varchar(20)', NOTNULL => 1},
            sortkey    => {TYPE => 'INT2', NOTNULL => 1},
        ],
        INDEXES => [
            milestones_unique_idx => {FIELDS => [qw(product_id value)],
                                      TYPE => 'UNIQUE'},
        ],
    },

    # Global Field Values
    # -------------------

    bug_status => {
        FIELDS => [
            id       => {TYPE => 'SMALLSERIAL', NOTNULL => 1,
                         PRIMARYKEY => 1},
            value    => {TYPE => 'varchar(64)', NOTNULL => 1},
            sortkey  => {TYPE => 'INT2', NOTNULL => 1, DEFAULT => 0},
            isactive => {TYPE => 'BOOLEAN', NOTNULL => 1, 
                         DEFAULT => 'TRUE'},
        ],
        INDEXES => [
            bug_status_unique_idx  => {FIELDS => ['value'],
                                       TYPE => 'UNIQUE'},
            bug_status_sortkey_idx => ['sortkey', 'value'],
        ],
    },

    resolution => {
        FIELDS => [
            id       => {TYPE => 'SMALLSERIAL', NOTNULL => 1,
                         PRIMARYKEY => 1},
            value    => {TYPE => 'varchar(64)', NOTNULL => 1},
            sortkey  => {TYPE => 'INT2', NOTNULL => 1, DEFAULT => 0},
            isactive => {TYPE => 'BOOLEAN', NOTNULL => 1, 
                         DEFAULT => 'TRUE'},
        ],
        INDEXES => [
            resolution_unique_idx  => {FIELDS => ['value'],
                                       TYPE => 'UNIQUE'},
            resolution_sortkey_idx => ['sortkey', 'value'],
        ],
    },

    bug_severity => {
        FIELDS => [
            id       => {TYPE => 'SMALLSERIAL', NOTNULL => 1, 
                         PRIMARYKEY => 1},
            value    => {TYPE => 'varchar(64)', NOTNULL => 1},
            sortkey  => {TYPE => 'INT2', NOTNULL => 1, DEFAULT => 0},
            isactive => {TYPE => 'BOOLEAN', NOTNULL => 1, 
                         DEFAULT => 'TRUE'},
        ],
        INDEXES => [
            bug_severity_unique_idx  => {FIELDS => ['value'],
                                         TYPE => 'UNIQUE'},
            bug_severity_sortkey_idx => ['sortkey', 'value'],
        ],
    },

    priority => {
        FIELDS => [
            id       => {TYPE => 'SMALLSERIAL', NOTNULL => 1,
                         PRIMARYKEY => 1},
            value    => {TYPE => 'varchar(64)', NOTNULL => 1},
            sortkey  => {TYPE => 'INT2', NOTNULL => 1, DEFAULT => 0},
            isactive => {TYPE => 'BOOLEAN', NOTNULL => 1, 
                         DEFAULT => 'TRUE'},
        ],
        INDEXES => [
            priority_unique_idx  => {FIELDS => ['value'],
                                     TYPE => 'UNIQUE'},
            priority_sortkey_idx => ['sortkey', 'value'],
        ],
    },

    rep_platform => {
        FIELDS => [
            id       => {TYPE => 'SMALLSERIAL', NOTNULL => 1,
                         PRIMARYKEY => 1},
            value    => {TYPE => 'varchar(64)', NOTNULL => 1},
            sortkey  => {TYPE => 'INT2', NOTNULL => 1, DEFAULT => 0},
            isactive => {TYPE => 'BOOLEAN', NOTNULL => 1, 
                         DEFAULT => 'TRUE'},
        ],
        INDEXES => [
            rep_platform_unique_idx  => {FIELDS => ['value'],
                                         TYPE => 'UNIQUE'},
            rep_platform_sortkey_idx => ['sortkey', 'value'],
        ],
    },

    op_sys => {
        FIELDS => [
            id       => {TYPE => 'SMALLSERIAL', NOTNULL => 1,
                         PRIMARYKEY => 1},
            value    => {TYPE => 'varchar(64)', NOTNULL => 1},
            sortkey  => {TYPE => 'INT2', NOTNULL => 1, DEFAULT => 0},
            isactive => {TYPE => 'BOOLEAN', NOTNULL => 1, 
                         DEFAULT => 'TRUE'},
        ],
        INDEXES => [
            op_sys_unique_idx  => {FIELDS => ['value'],
                                   TYPE => 'UNIQUE'},
            op_sys_sortkey_idx => ['sortkey', 'value'],
        ],
    },

    # USER INFO
    # ---------

    # General User Information
    # ------------------------

    profiles => {
        FIELDS => [
            userid         => {TYPE => 'MEDIUMSERIAL', NOTNULL => 1,
                               PRIMARYKEY => 1},
            login_name     => {TYPE => 'varchar(255)', NOTNULL => 1},
            cryptpassword  => {TYPE => 'varchar(128)'},
            realname       => {TYPE => 'varchar(255)'},
            disabledtext   => {TYPE => 'MEDIUMTEXT', NOTNULL => 1},
            mybugslink     => {TYPE => 'BOOLEAN', NOTNULL => 1,
                               DEFAULT => 'TRUE'},
            emailflags     => {TYPE => 'MEDIUMTEXT'},
            refreshed_when => {TYPE => 'DATETIME', NOTNULL => 1},
            extern_id      => {TYPE => 'varchar(64)'},
        ],
        INDEXES => [
            profiles_unique_idx => {FIELDS => ['login_name'],
                                    TYPE => 'UNIQUE'},
        ],
    },

    profiles_activity => {
        FIELDS => [
            userid        => {TYPE => 'INT3', NOTNULL => 1},
            who           => {TYPE => 'INT3', NOTNULL => 1},
            profiles_when => {TYPE => 'DATETIME', NOTNULL => 1},
            fieldid       => {TYPE => 'INT3', NOTNULL => 1},
            oldvalue      => {TYPE => 'TINYTEXT'},
            newvalue      => {TYPE => 'TINYTEXT'},
        ],
        INDEXES => [
            profiles_activity_userid_idx  => ['userid'],
            profiles_activity_when_idx    => ['profiles_when'],
            profiles_activity_fieldid_idx => ['fieldid'],
        ],
    },

    watch => {
        FIELDS => [
            watcher => {TYPE => 'INT3', NOTNULL => 1},
            watched => {TYPE => 'INT3', NOTNULL => 1},
        ],
        INDEXES => [
            watch_unique_idx  => {FIELDS => [qw(watcher watched)],
                                  TYPE => 'UNIQUE'},
            watch_watched_idx => ['watched'],
        ],
    },

    namedqueries => {
        FIELDS => [
            userid       => {TYPE => 'INT3', NOTNULL => 1},
            name         => {TYPE => 'varchar(64)', NOTNULL => 1},
            linkinfooter => {TYPE => 'BOOLEAN', NOTNULL => 1},
            query        => {TYPE => 'MEDIUMTEXT', NOTNULL => 1},
        ],
        INDEXES => [
            namedqueries_unique_idx => {FIELDS => [qw(userid name)],
                                        TYPE => 'UNIQUE'},
        ],
    },

    # Authentication
    # --------------

    logincookies => {
        FIELDS => [
            cookie   => {TYPE => 'MEDIUMSERIAL', NOTNULL => 1,
                         PRIMARYKEY => 1},
            userid   => {TYPE => 'INT3', NOTNULL => 1},
            ipaddr   => {TYPE => 'varchar(40)', NOTNULL => 1},
            lastused => {TYPE => 'DATETIME', NOTNULL => 1},
        ],
        INDEXES => [
            logincookies_lastused_idx => ['lastused'],
        ],
    },

    # "tokens" stores the tokens users receive when a password or email
    #     change is requested.  Tokens provide an extra measure of security
    #     for these changes.
    tokens => {
        FIELDS => [
            userid    => {TYPE => 'INT3', NOTNULL => 1} ,
            issuedate => {TYPE => 'DATETIME', NOTNULL => 1} ,
            token     => {TYPE => 'varchar(16)', NOTNULL => 1,
                          PRIMARYKEY => 1},
            tokentype => {TYPE => 'varchar(8)', NOTNULL => 1} ,
            eventdata => {TYPE => 'TINYTEXT'},
        ],
        INDEXES => [
            tokens_userid_idx => ['userid'],
        ],
    },

    # GROUPS
    # ------

    groups => {
        FIELDS => [
            id           => {TYPE => 'MEDIUMSERIAL', NOTNULL => 1,
                             PRIMARYKEY => 1},
            name         => {TYPE => 'varchar(255)', NOTNULL => 1},
            description  => {TYPE => 'TEXT', NOTNULL => 1},
            isbuggroup   => {TYPE => 'BOOLEAN', NOTNULL => 1},
            last_changed => {TYPE => 'DATETIME', NOTNULL => 1},
            userregexp   => {TYPE => 'TINYTEXT', NOTNULL => 1},
            isactive     => {TYPE => 'BOOLEAN', NOTNULL => 1,
                             DEFAULT => 'TRUE'},
        ],
        INDEXES => [
            groups_unique_idx => {FIELDS => ['name'], TYPE => 'UNIQUE'},
        ],
    },

    group_control_map => {
        FIELDS => [
            group_id      => {TYPE => 'INT3', NOTNULL => 1},
            product_id    => {TYPE => 'INT3', NOTNULL => 1},
            entry         => {TYPE => 'BOOLEAN', NOTNULL => 1},
            membercontrol => {TYPE => 'BOOLEAN', NOTNULL => 1},
            othercontrol  => {TYPE => 'BOOLEAN', NOTNULL => 1},
            canedit       => {TYPE => 'BOOLEAN', NOTNULL => 1},
        ],
        INDEXES => [
            group_control_map_unique_idx =>
            {FIELDS => [qw(product_id group_id)], TYPE => 'UNIQUE'},
            group_control_map_gid_idx    => ['group_id'],
        ],
    },

    # "user_group_map" determines the groups that a user belongs to
    # directly or due to regexp and which groups can be blessed by a user.
    #
    # grant_type:
    # if GRANT_DIRECT - record was explicitly granted
    # if GRANT_DERIVED - record was derived from expanding a group hierarchy
    # if GRANT_REGEXP - record was created by evaluating a regexp
    user_group_map => {
        FIELDS => [
            user_id    => {TYPE => 'INT3', NOTNULL => 1},
            group_id   => {TYPE => 'INT3', NOTNULL => 1},
            isbless    => {TYPE => 'BOOLEAN', NOTNULL => 1,
                           DEFAULT => 'FALSE'},
            grant_type => {TYPE => 'INT1', NOTNULL => 1,
                           DEFAULT => '0'},
        ],
        INDEXES => [
            user_group_map_unique_idx =>
                {FIELDS => [qw(user_id group_id grant_type isbless)],
                 TYPE => 'UNIQUE'},
        ],
    },

    # This table determines which groups are made a member of another
    # group, given the ability to bless another group, or given
    # visibility to another groups existence and membership
    # grant_type:
    # if GROUP_MEMBERSHIP - member groups are made members of grantor
    # if GROUP_BLESS - member groups may grant membership in grantor
    # if GROUP_VISIBLE - member groups may see grantor group
    group_group_map => {
        FIELDS => [
            member_id  => {TYPE => 'INT3', NOTNULL => 1},
            grantor_id => {TYPE => 'INT3', NOTNULL => 1},
            grant_type => {TYPE => 'INT1', NOTNULL => 1,
                           DEFAULT => '0'},
        ],
        INDEXES => [
            group_group_map_unique_idx =>
                {FIELDS => [qw(member_id grantor_id grant_type)],
                 TYPE => 'UNIQUE'},
        ],
    },

    # This table determines which groups a user must be a member of
    # in order to see a bug.
    bug_group_map => {
        FIELDS => [
            bug_id   => {TYPE => 'INT3', NOTNULL => 1},
            group_id => {TYPE => 'INT3', NOTNULL => 1},
        ],
        INDEXES => [
            bug_group_map_unique_idx   =>
                {FIELDS => [qw(bug_id group_id)], TYPE => 'UNIQUE'},
            bug_group_map_group_id_idx => ['group_id'],
        ],
    },

    category_group_map => {
        FIELDS => [
            category_id => {TYPE => 'INT2', NOTNULL => 1},
            group_id    => {TYPE => 'INT3', NOTNULL => 1},
        ],
        INDEXES => [
            category_group_map_unique_idx =>
                {FIELDS => [qw(category_id group_id)], TYPE => 'UNIQUE'},
        ],
    },


    # PRODUCTS
    # --------

    classifications => {
        FIELDS => [
            id          => {TYPE => 'SMALLSERIAL', NOTNULL => 1,
                            PRIMARYKEY => 1},
            name        => {TYPE => 'varchar(64)', NOTNULL => 1},
            description => {TYPE => 'MEDIUMTEXT'},
        ],
        INDEXES => [
            classifications_unique_idx => {FIELDS => ['name'],
                                           TYPE => 'UNIQUE'},
        ],
    },

    products => {
        FIELDS => [
            id                => {TYPE => 'SMALLSERIAL', NOTNULL => 1,
                                  PRIMARYKEY => 1},
            name              => {TYPE => 'varchar(64)', NOTNULL => 1},
            classification_id => {TYPE => 'INT2', NOTNULL => 1,
                                  DEFAULT => '1'},
            description       => {TYPE => 'MEDIUMTEXT'},
            milestoneurl      => {TYPE => 'TINYTEXT', NOTNULL => 1},
            disallownew       => {TYPE => 'BOOLEAN', NOTNULL => 1},
            votesperuser      => {TYPE => 'INT2', NOTNULL => 1},
            maxvotesperbug    => {TYPE => 'INT2', NOTNULL => 1,
                                  DEFAULT => '10000'},
            votestoconfirm    => {TYPE => 'INT2', NOTNULL => 1},
            defaultmilestone  => {TYPE => 'varchar(20)',
                                  NOTNULL => 1, DEFAULT => "'---'"},
        ],
        INDEXES => [
            products_unique_idx => {FIELDS => ['name'],
                                    TYPE => 'UNIQUE'},
        ],
    },

    components => {
        FIELDS => [
            id               => {TYPE => 'SMALLSERIAL', NOTNULL => 1,
                                 PRIMARYKEY => 1},
            name             => {TYPE => 'varchar(64)', NOTNULL => 1},
            product_id       => {TYPE => 'INT2', NOTNULL => 1},
            initialowner     => {TYPE => 'INT3'},
            initialqacontact => {TYPE => 'INT3'},
            description      => {TYPE => 'MEDIUMTEXT', NOTNULL => 1},
        ],
        INDEXES => [
            components_unique_idx => {FIELDS => [qw(product_id name)],
                                      TYPE => 'UNIQUE'},
            components_name_idx   => ['name'],
        ],
    },

    # CHARTS
    # ------

    series => {
        FIELDS => [
            series_id   => {TYPE => 'MEDIUMSERIAL', NOTNULL => 1,
                            PRIMARYKEY => 1},
            creator     => {TYPE => 'INT3', NOTNULL => 1},
            category    => {TYPE => 'INT2', NOTNULL => 1},
            subcategory => {TYPE => 'INT2', NOTNULL => 1},
            name        => {TYPE => 'varchar(64)', NOTNULL => 1},
            frequency   => {TYPE => 'INT2', NOTNULL => 1},
            last_viewed => {TYPE => 'DATETIME'},
            query       => {TYPE => 'MEDIUMTEXT', NOTNULL => 1},
            public      => {TYPE => 'BOOLEAN', NOTNULL => 1,
                            DEFAULT => 'FALSE'},
        ],
        INDEXES => [
            series_unique_idx  =>
                {FIELDS => [qw(creator category subcategory name)],
                 TYPE => 'UNIQUE'},
            series_creator_idx => ['creator'],
        ],
    },

    series_data => {
        FIELDS => [
            series_id    => {TYPE => 'INT3', NOTNULL => 1},
            series_date  => {TYPE => 'DATETIME', NOTNULL => 1},
            series_value => {TYPE => 'INT3', NOTNULL => 1},
        ],
        INDEXES => [
            series_data_unique_idx =>
                {FIELDS => [qw(series_id series_date)],
                 TYPE => 'UNIQUE'},
        ],
    },

    series_categories => {
        FIELDS => [
            id   => {TYPE => 'SMALLSERIAL', NOTNULL => 1,
                     PRIMARYKEY => 1},
            name => {TYPE => 'varchar(64)', NOTNULL => 1},
        ],
        INDEXES => [
            series_cats_unique_idx => {FIELDS => ['name'],
                                       TYPE => 'UNIQUE'},
        ],
    },

    # WHINE SYSTEM
    # ------------

    whine_queries => {
        FIELDS => [
            id            => {TYPE => 'MEDIUMSERIAL', PRIMARYKEY => 1},
            eventid       => {TYPE => 'INT3', NOTNULL => 1},
            query_name    => {TYPE => 'varchar(64)', NOTNULL => 1,
                              DEFAULT => "''"},
            sortkey       => {TYPE => 'INT2', NOTNULL => 1,
                              DEFAULT => '0'},
            onemailperbug => {TYPE => 'BOOLEAN', NOTNULL => 1,
                              DEFAULT => 'FALSE'},
            title         => {TYPE => 'varchar(128)', NOTNULL => 1},
        ],
        INDEXES => [
            whine_queries_eventid_idx => ['eventid'],
        ],
    },

    whine_schedules => {
        FIELDS => [
            id          => {TYPE => 'MEDIUMSERIAL', PRIMARYKEY => 1},
            eventid     => {TYPE => 'INT3', NOTNULL => 1},
            run_day     => {TYPE => 'varchar(32)'},
            run_time    => {TYPE => 'varchar(32)'},
            run_next    => {TYPE => 'DATETIME'},
            mailto      => {TYPE => 'INT3', NOTNULL => 1},
            mailto_type => {TYPE => 'INT2', NOTNULL => 1, DEFAULT => '0'},
        ],
        INDEXES => [
            whine_schedules_run_next_idx => ['run_next'],
            whine_schedules_eventid_idx  => ['eventid'],
        ],
    },

    whine_events => {
        FIELDS => [
            id           => {TYPE => 'MEDIUMSERIAL', PRIMARYKEY => 1},
            owner_userid => {TYPE => 'INT3', NOTNULL => 1},
            subject      => {TYPE => 'varchar(128)'},
            body         => {TYPE => 'MEDIUMTEXT'},
        ],
    },

    # QUIPS
    # -----

    quips => {
        FIELDS => [
            quipid   => {TYPE => 'MEDIUMSERIAL', NOTNULL => 1,
                         PRIMARYKEY => 1},
            userid   => {TYPE => 'INT3'},
            quip     => {TYPE => 'TEXT', NOTNULL => 1},
            approved => {TYPE => 'BOOLEAN', NOTNULL => 1,
                         DEFAULT => 'TRUE'},
        ],
    },

    # SETTINGS
    # --------
    # setting          - each global setting will have exactly one entry
    #                    in this table.
    # setting_value    - stores the list of acceptable values for each
    #                    setting, and a sort index that controls the order
    #                    in which the values are displayed.
    # profile_setting  - If a user has chosen to use a value other than the
    #                    global default for a given setting, it will be
    #                    stored in this table. Note: even if a setting is
    #                    later changed so is_enabled = false, the stored
    #                    value will remain in case it is ever enabled again.
    #
    setting => {
        FIELDS => [
            name          => {TYPE => 'varchar(32)', NOTNULL => 1,
                              PRIMARYKEY => 1}, 
            default_value => {TYPE => 'varchar(32)', NOTNULL => 1},
            is_enabled    => {TYPE => 'BOOLEAN', NOTNULL => 1,
                              DEFAULT => 'TRUE'},
        ],
    },

    setting_value => {
        FIELDS => [
            name        => {TYPE => 'varchar(32)', NOTNULL => 1},
            value       => {TYPE => 'varchar(32)', NOTNULL => 1},
            sortindex   => {TYPE => 'INT2', NOTNULL => 1},
        ],
        INDEXES => [
            setting_value_nv_unique_idx  => {FIELDS => [qw(name value)],
                                             TYPE => 'UNIQUE'},
            setting_value_ns_unique_idx  => {FIELDS => [qw(name sortindex)],
                                             TYPE => 'UNIQUE'},
        ],
     },

    profile_setting => {
        FIELDS => [
            user_id       => {TYPE => 'INT3', NOTNULL => 1},
            setting_name  => {TYPE => 'varchar(32)', NOTNULL => 1},
            setting_value => {TYPE => 'varchar(32)', NOTNULL => 1},
        ],
        INDEXES => [
            profile_setting_value_unique_idx  => {FIELDS => [qw(user_id setting_name)],
                                                  TYPE => 'UNIQUE'},
        ],
     },

};
#--------------------------------------------------------------------------

=head1 METHODS

Note: Methods which can be implemented generically for all DBs are
implemented in this module. If needed, they can be overriden with
DB-specific code in a subclass. Methods which are prefixed with C<_>
are considered protected. Subclasses may override these methods, but
other modules should not invoke these methods directly.

=over 4

=cut

#--------------------------------------------------------------------------
sub new {

=item C<new>

 Description: Public constructor method used to instantiate objects of this
              class. However, it also can be used as a factory method to
              instantiate database-specific subclasses when an optional
              driver argument is supplied.
 Parameters:  $driver (optional) - Used to specify the type of database.
              This routine C<die>s if no subclass is found for the specified
              driver.
 Returns:     new instance of the Schema class or a database-specific subclass

=cut

    my $this = shift;
    my $class = ref($this) || $this;
    my $driver = shift;

    if ($driver) {
        (my $subclass = $driver) =~ s/^(\S)/\U$1/;
        $class .= '::' . $subclass;
        eval "require $class;";
        die "The $class class could not be found ($subclass " .
            "not supported?): $@" if ($@);
    }
    die "$class is an abstract base class. Instantiate a subclass instead."
      if ($class eq __PACKAGE__);

    my $self = {};
    bless $self, $class;
    $self = $self->_initialize(@_);

    return($self);

} #eosub--new
#--------------------------------------------------------------------------
sub _initialize {

=item C<_initialize>

 Description: Protected method that initializes an object after
              instantiation with the abstract schema. All subclasses should
              override this method. The typical subclass implementation
              should first call the C<_initialize> method of the superclass,
              then do any database-specific initialization (especially
              define the database-specific implementation of the all
              abstract data types), and then call the C<_adjust_schema>
              method.
 Parameters:  none
 Returns:     the instance of the Schema class

=cut

    my $self = shift;

    $self->{schema} = dclone(ABSTRACT_SCHEMA);
    $self->{abstract_schema} = ABSTRACT_SCHEMA;

    return $self;

} #eosub--_initialize
#--------------------------------------------------------------------------
sub _adjust_schema {

=item C<_adjust_schema>

 Description: Protected method that alters the abstract schema at
              instantiation-time to be database-specific. It is a generic
              enough routine that it can be defined here in the base class.
              It takes the abstract schema and replaces the abstract data
              types with database-specific data types.
 Parameters:  none
 Returns:     the instance of the Schema class

=cut

    my $self = shift;

    # The _initialize method has already set up the db_specific hash with
    # the information on how to implement the abstract data types for the
    # instantiated DBMS-specific subclass.
    my $db_specific = $self->{db_specific};

    # Loop over each table in the abstract database schema.
    foreach my $table (keys %{ $self->{schema} }) {
        my %fields = (@{ $self->{schema}{$table}{FIELDS} });
        # Loop over the field defintions in each table.
        foreach my $field_def (values %fields) {
            # If the field type is an abstract data type defined in the
            # $db_specific hash, replace it with the DBMS-specific data type
            # that implements it.
            if (exists($db_specific->{$field_def->{TYPE}})) {
                $field_def->{TYPE} = $db_specific->{$field_def->{TYPE}};
            }
            # Replace abstract default values (such as 'TRUE' and 'FALSE')
            # with their database-specific implementations.
            if (exists($field_def->{DEFAULT})
                && exists($db_specific->{$field_def->{DEFAULT}})) {
                $field_def->{DEFAULT} = $db_specific->{$field_def->{DEFAULT}};
            }
        }
    }

    return $self;

} #eosub--_adjust_schema
#--------------------------------------------------------------------------
sub get_type_ddl {

=item C<get_type_ddl>

 Description: Public method to convert abstract (database-generic) field
              specifiers to database-specific data types suitable for use
              in a C<CREATE TABLE> or C<ALTER TABLE> SQL statment. If no
              database-specific field type has been defined for the given
              field type, then it will just return the same field type.
 Parameters:  a hash or a reference to a hash of a field containing the
              following keys: C<TYPE> (required), C<NOTNULL> (optional),
              C<DEFAULT> (optional), C<PRIMARYKEY> (optional), C<REFERENCES>
              (optional)
 Returns:     a DDL string suitable for describing a field in a
              C<CREATE TABLE> or C<ALTER TABLE> SQL statement

=cut

    my $self = shift;
    my $finfo = (@_ == 1 && ref($_[0]) eq 'HASH') ? $_[0] : { @_ };

    my $type = $finfo->{TYPE};
    die "A valid TYPE was not specified for this column." unless ($type);
    my $default = $finfo->{DEFAULT};
    my $fkref = $self->{enable_references} ? $finfo->{REFERENCES} : undef;
    my $type_ddl = $self->{db_specific}{$type} || $type;
    $type_ddl .= " NOT NULL" if ($finfo->{NOTNULL});
    $type_ddl .= " DEFAULT $default" if (defined($default));
    $type_ddl .= " PRIMARY KEY" if ($finfo->{PRIMARYKEY});
    $type_ddl .= "\n\t\t\t\tREFERENCES $fkref" if $fkref;

    return($type_ddl);

} #eosub--get_type_ddl
#--------------------------------------------------------------------------
sub get_column_info {

=item C<get_column_info>

 Description: Public method to generate a DDL segment of a "create table"
              SQL statement for a given table and field.
 Parameters:  $table - the table name
              $column - a column in the table
 Returns:     a hash containing information about the column including its
              type (C<TYPE>), whether or not it can be null (C<NOTNULL>),
              its default value if it has one (C<DEFAULT), whether it is
              a etc. The hash will be empty if either the specified
              table or column does not exist in the database schema.

=cut

    my($self, $table, $column) = @_;

    my $thash = $self->{schema}{$table};
    return() unless ($thash);

    my %fields = @{ $thash->{FIELDS} };
    return() unless ($fields{$column});
    return %{ $fields{$column} };

} #eosub--get_column_info
#--------------------------------------------------------------------------
sub get_table_list {

=item C<get_table_list>

 Description: Public method for discovering what tables should exist in the
              Bugzilla database.
 Parameters:  none
 Returns:     an array of table names

=cut

    my $self = shift;

    return(sort(keys %{ $self->{schema} }));

} #eosub--get_table_list
#--------------------------------------------------------------------------
sub get_table_columns {

=item C<get_table_columns>

 Description: Public method for discovering what columns are in a given
              table in the Bugzilla database.
 Parameters:  $table - the table name
 Returns:     array of column names

=cut

    my($self, $table) = @_;
    my @ddl = ();

    my $thash = $self->{schema}{$table};
    die "Table $table does not exist in the database schema."
        unless (ref($thash));

    my @columns = ();
    my @fields = @{ $thash->{FIELDS} };
    while (@fields) {
        push(@columns, shift(@fields));
        shift(@fields);
    }

    return @columns;

} #eosub--get_table_columns
#--------------------------------------------------------------------------
sub get_table_ddl {

=item C<get_table_ddl>

 Description: Public method to generate the SQL statements needed to create
              the a given table and its indexes in the Bugzilla database.
              Subclasses may override or extend this method, if needed, but
              subclasses probably should override C<_get_create_table_ddl>
              or C<_get_create_index_ddl> instead.
 Parameters:  $table - the table name
 Returns:     an array of strings containing SQL statements

=cut

    my($self, $table) = @_;
    my @ddl = ();

    die "Table $table does not exist in the database schema."
        unless (ref($self->{schema}{$table}));

    my $create_table = $self->_get_create_table_ddl($table);
    push(@ddl, $create_table) if $create_table;

    my @indexes = @{ $self->{schema}{$table}{INDEXES} || [] };
    while (@indexes) {
        my $index_name = shift(@indexes);
        my $index_info = shift(@indexes);
        my($index_fields,$index_type);
        if (ref($index_info) eq 'HASH') {
            $index_fields = $index_info->{FIELDS};
            $index_type = $index_info->{TYPE};
        } else {
            $index_fields = $index_info;
            $index_type = '';
        }
        my $index_sql = $self->_get_create_index_ddl($table,
                                                     $index_name,
                                                     $index_fields,
                                                     $index_type);
        push(@ddl, $index_sql) if $index_sql;
    }

    push(@ddl, @{ $self->{schema}{$table}{DB_EXTRAS} })
      if (ref($self->{schema}{$table}{DB_EXTRAS}));

    return @ddl;

} #eosub--get_table_ddl
#--------------------------------------------------------------------------
sub _get_create_table_ddl {

=item C<_get_create_table_ddl>

 Description: Protected method to generate the "create table" SQL statement
              for a given table.
 Parameters:  $table - the table name
 Returns:     a string containing the DDL statement for the specified table

=cut

    my($self, $table) = @_;

    my $thash = $self->{schema}{$table};
    die "Table $table does not exist in the database schema."
        unless (ref($thash));

    my $create_table = "CREATE TABLE $table \(\n";

    my @fields = @{ $thash->{FIELDS} };
    while (@fields) {
        my $field = shift(@fields);
        my $finfo = shift(@fields);
        $create_table .= "\t$field\t" . $self->get_type_ddl($finfo);
        $create_table .= "," if (@fields);
        $create_table .= "\n";
    }

    $create_table .= "\)";

    return($create_table)

} #eosub--_get_create_table_ddl
#--------------------------------------------------------------------------
sub _get_create_index_ddl {

=item C<_get_create_index_ddl>

 Description: Protected method to generate a "create index" SQL statement
              for a given table and index.
 Parameters:  $table_name - the name of the table
              $index_name - the name of the index
              $index_fields - a reference to an array of field names
              $index_type (optional) - specify type of index (e.g., UNIQUE)
 Returns:     a string containing the DDL statement

=cut

    my($self, $table_name, $index_name, $index_fields, $index_type) = @_;

    my $sql = "CREATE ";
    $sql .= "$index_type " if ($index_type eq 'UNIQUE');
    $sql .= "INDEX $index_name ON $table_name \(" .
      join(", ", @$index_fields) . "\)";

    return($sql);

} #eosub--_get_create_index_ddl
#--------------------------------------------------------------------------
1;
__END__

=back

=head1 ABSTRACT DATA TYPES

The following abstract data types are used:

=over 4

=item C<BOOLEAN>

=item C<INT1>

=item C<INT2>

=item C<INT3>

=item C<INT4>

=item C<SMALLSERIAL>

=item C<MEDIUMSERIAL>

=item C<INTSERIAL>

=item C<TINYTEXT>

=item C<MEDIUMTEXT>

=item C<TEXT>

=item C<LONGBLOB>

=item C<DATETIME>

=back

Database-specific subclasses should define the implementation for these data
types as a hash reference stored internally in the schema object as
C<db_specific>. This is typically done in overriden L<_initialize> method.

The following abstract boolean values should also be defined on a
database-specific basis:

=over 4

=item C<TRUE>

=item C<FALSE>

=back

=head1 SEE ALSO

L<Bugzilla::DB>

=cut