summaryrefslogtreecommitdiffstats
path: root/Bugzilla/DB/Oracle.pm
blob: 73ed2068c899ad5276bf9ca4247ba5a5e226b3d8 (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
# -*- 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 Oracle Corporation. 
# Portions created by Oracle are Copyright (C) 2007 Oracle Corporation. 
# All Rights Reserved.
#
# Contributor(s): Lance Larsh <lance.larsh@oracle.com>
#                 Xiaoou Wu   <xiaoou.wu@oracle.com>
#                 Max Kanat-Alexander <mkanat@bugzilla.org>

=head1 NAME

Bugzilla::DB::Oracle - Bugzilla database compatibility layer for Oracle

=head1 DESCRIPTION

This module overrides methods of the Bugzilla::DB module with Oracle
specific implementation. It is instantiated by the Bugzilla::DB module
and should never be used directly.

For interface details see L<Bugzilla::DB> and L<DBI>.

=cut

package Bugzilla::DB::Oracle;
use strict;
use base qw(Bugzilla::DB);

use DBD::Oracle;
use DBD::Oracle qw(:ora_types);
use Bugzilla::Constants;
use Bugzilla::Error;
use Bugzilla::Util;

#####################################################################
# Constants
#####################################################################
use constant EMPTY_STRING  => '__BZ_EMPTY_STR__';
use constant ISOLATION_LEVEL => 'READ COMMITTED';
use constant BLOB_TYPE => { ora_type => ORA_BLOB };
use constant FULLTEXT_OR => ' OR ';

sub new {
    my ($class, $params) = @_;
    my ($user, $pass, $host, $dbname, $port) = 
        @$params{qw(db_user db_pass db_host db_name db_port)};

    # You can never connect to Oracle without a DB name,
    # and there is no default DB.
    $dbname ||= Bugzilla->localconfig->{db_name};

    # Set the language enviroment
    $ENV{'NLS_LANG'} = '.AL32UTF8' if Bugzilla->params->{'utf8'};

    # construct the DSN from the parameters we got
    my $dsn = "dbi:Oracle:host=$host;sid=$dbname";
    $dsn .= ";port=$port" if $port;
    my $attrs = { FetchHashKeyName => 'NAME_lc',  
                  LongReadLen => ( Bugzilla->params->{'maxattachmentsize'}
                                     || 1000 ) * 1024, 
                };
    my $self = $class->db_new({ dsn => $dsn, user => $user, 
                                pass => $pass, attrs => $attrs });
    # Needed by TheSchwartz
    $self->{private_bz_dsn} = $dsn;

    bless ($self, $class);

    # Set the session's default date format to match MySQL
    $self->do("ALTER SESSION SET NLS_DATE_FORMAT='YYYY-MM-DD HH24:MI:SS'");
    $self->do("ALTER SESSION SET NLS_TIMESTAMP_FORMAT='YYYY-MM-DD HH24:MI:SS'");
    $self->do("ALTER SESSION SET NLS_LENGTH_SEMANTICS='CHAR'") 
        if Bugzilla->params->{'utf8'};
    # To allow case insensitive query.
    $self->do("ALTER SESSION SET NLS_COMP='ANSI'");
    $self->do("ALTER SESSION SET NLS_SORT='BINARY_AI'");
    return $self;
}

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

    my $seq = $table . "_" . $column . "_SEQ";
    my ($last_insert_id) = $self->selectrow_array("SELECT $seq.CURRVAL "
                                                  . " FROM DUAL");
    return $last_insert_id;
}

sub bz_check_regexp {
    my ($self, $pattern) = @_;

    eval { $self->do("SELECT 1 FROM DUAL WHERE "
          . $self->sql_regexp($self->quote("a"), $pattern, 1)) };

    $@ && ThrowUserError('illegal_regexp',
        { value => $pattern, dberror => $self->errstr });
}

sub bz_explain { 
     my ($self, $sql) = @_; 
     my $sth = $self->prepare("EXPLAIN PLAN FOR $sql"); 
     $sth->execute();
     my $explain = $self->selectcol_arrayref(
         "SELECT PLAN_TABLE_OUTPUT FROM TABLE(DBMS_XPLAN.DISPLAY)");
     return join("\n", @$explain); 
} 

sub sql_group_concat {
    my ($self, $text, $separator) = @_;
    $separator = $self->quote(', ') if !defined $separator;
    return "group_concat(T_CLOB_DELIM($text, $separator))";
}

sub sql_regexp {
    my ($self, $expr, $pattern, $nocheck, $real_pattern) = @_;
    $real_pattern ||= $pattern;

    $self->bz_check_regexp($real_pattern) if !$nocheck;

    return "REGEXP_LIKE($expr, $pattern)";
}

sub sql_not_regexp {
    my ($self, $expr, $pattern, $nocheck, $real_pattern) = @_;
    $real_pattern ||= $pattern;

    $self->bz_check_regexp($real_pattern) if !$nocheck;

    return "NOT REGEXP_LIKE($expr, $pattern)" 
}

sub sql_limit {
    my ($self, $limit, $offset) = @_;

    if(defined $offset) {
        return  "/* LIMIT $limit $offset */";
    }
    return "/* LIMIT $limit */";
}

sub sql_string_concat {
    my ($self, @params) = @_;

    return 'CONCAT(' . join(', ', @params) . ')';
}

sub sql_string_until {
    my ($self, $string, $substring) = @_;
    return "SUBSTR($string, 1, " 
           . $self->sql_position($substring, $string)
           . " - 1)";
}

sub sql_to_days {
    my ($self, $date) = @_;

    return " TO_CHAR(TO_DATE($date),'J') ";
}
sub sql_from_days{
    my ($self, $date) = @_;

    return " TO_DATE($date,'J') ";
}
sub sql_fulltext_search {
    my ($self, $column, $text, $label) = @_;
    $text = $self->quote($text);
    trick_taint($text);
    return "CONTAINS($column,$text,$label) > 0", "SCORE($label)";
}

sub sql_date_format {
    my ($self, $date, $format) = @_;
    
    $format = "%Y.%m.%d %H:%i:%s" if !$format;

    $format =~ s/\%Y/YYYY/g;
    $format =~ s/\%y/YY/g;
    $format =~ s/\%m/MM/g;
    $format =~ s/\%d/DD/g;
    $format =~ s/\%a/Dy/g;
    $format =~ s/\%H/HH24/g;
    $format =~ s/\%i/MI/g;
    $format =~ s/\%s/SS/g;

    return "TO_CHAR($date, " . $self->quote($format) . ")";
}

sub sql_date_math {
    my ($self, $date, $operator, $interval, $units) = @_;
    my $time_sql;
    if ($units =~ /YEAR|MONTH/i) {
        $time_sql = "NUMTOYMINTERVAL($interval,'$units')";
    } else{
        $time_sql = "NUMTODSINTERVAL($interval,'$units')";
    }
   return "$date $operator $time_sql";
}

sub sql_position {
    my ($self, $fragment, $text) = @_;
    return "INSTR($text, $fragment)";
}

sub sql_in {
    my ($self, $column_name, $in_list_ref) = @_;
    my @in_list = @$in_list_ref;
    return $self->SUPER::sql_in($column_name, $in_list_ref) if $#in_list < 1000;
    my @in_str;
    while (@in_list) {
        my $length = $#in_list + 1;
        my $splice = $length > 1000 ? 1000 : $length;
        my @sub_in_list = splice(@in_list, 0, $splice);
        push(@in_str, 
             $self->SUPER::sql_in($column_name, \@sub_in_list)); 
    }
    return "( " . join(" OR ", @in_str) . " )";
}

sub _bz_add_field_table {
    my ($self, $name, $schema_ref, $type) = @_;
    $self->SUPER::_bz_add_field_table($name, $schema_ref);
    if (defined($type) && $type == FIELD_TYPE_MULTI_SELECT) {
        my $uk_name = "UK_" . $self->_bz_schema->_hash_identifier($name . '_value');
        $self->do("ALTER TABLE $name ADD CONSTRAINT $uk_name UNIQUE(value)");
    }
}

sub bz_drop_table {
     my ($self, $name) = @_;
     my $table_exists = $self->bz_table_info($name);
     if ($table_exists) {
         $self->_bz_drop_fks($name);
         $self->SUPER::bz_drop_table($name);
     }
}

# Dropping all FKs for a specified table. 
sub _bz_drop_fks {
    my ($self, $table) = @_;
    my @columns = $self->bz_table_columns($table);
    foreach my $column (@columns) {
        $self->bz_drop_fk($table, $column);
    }
}

sub _fix_empty {
    my ($string) = @_;
    $string = '' if $string eq EMPTY_STRING;
    return $string;
}

sub _fix_arrayref {
    my ($row) = @_;
    return undef if !defined $row;
    foreach my $field (@$row) {
        $field = _fix_empty($field) if defined $field;
    }
    return $row;
}

sub _fix_hashref {
     my ($row) = @_;
     return undef if !defined $row;
     foreach my $value (values %$row) {
       $value = _fix_empty($value) if defined $value;
     }
     return $row;
}

sub adjust_statement {
    my ($sql) = @_;
    
    if ($sql =~ /^CREATE OR REPLACE.*/i){
        return $sql;
    } 

    # We can't just assume any occurrence of "''" in $sql is an empty
    # string, since "''" can occur inside a string literal as a way of
    # escaping a single "'" in the literal.  Therefore we must be trickier...

    # split the statement into parts by single-quotes.  The negative value
    # at the end to the split operator from dropping trailing empty strings
    # (e.g., when $sql ends in "''")
    my @parts = split /'/, $sql, -1;

    if( !(@parts % 2) ) {
        # Either the string is empty or the quotes are mismatched
        # Returning input unmodified.
        return $sql;
    }

    # We already verified that we have an odd number of parts.  If we take
    # the first part off now, we know we're entering the loop with an even
    # number of parts
    my @result;
    my $part = shift @parts;
    
    # Oracle requires a FROM clause in all SELECT statements, so append
    # "FROM dual" to queries without one (e.g., "SELECT NOW()")
    my $is_select = ($part =~ m/^\s*SELECT\b/io);
    my $has_from =  ($part =~ m/\bFROM\b/io) if $is_select;

    # Oracle use SUBSTR instead of SUBSTRING
    $part =~ s/\bSUBSTRING\b/SUBSTR/io;
   
    # Oracle need no 'AS'
    $part =~ s/\bAS\b//ig;
    
    # Oracle doesn't have LIMIT, so if we find the LIMIT comment, wrap the
    # query with "SELECT * FROM (...) WHERE rownum < $limit"
    my ($limit,$offset) = ($part =~ m{/\* LIMIT (\d*) (\d*) \*/}o);
    
    push @result, $part;
    while( @parts ) {
        my $string = shift @parts;
        my $nonstring = shift @parts;
    
        # if the non-string part is zero-length and there are more parts left,
        # then this is an escaped quote inside a string literal   
        while( !(length $nonstring) && @parts  ) {
            # we know it's safe to remove two parts at a time, since we
            # entered the loop with an even number of parts
            $string .= "''" . shift @parts;
            $nonstring = shift @parts;
        }

        # Look for a FROM if this is a SELECT and we haven't found one yet
        $has_from = ($nonstring =~ m/\bFROM\b/io) 
                    if ($is_select and !$has_from);

        # Oracle use SUBSTR instead of SUBSTRING
        $nonstring =~ s/\bSUBSTRING\b/SUBSTR/io;

        # Oracle need no 'AS'
        $nonstring =~ s/\bAS\b//ig;

        # Look for a LIMIT clause
        ($limit) = ($nonstring =~ m(/\* LIMIT (\d*) \*/)o);

        if(!length($string)){
           push @result, EMPTY_STRING;
           push @result, $nonstring;
        } else {
           push @result, $string;
           push @result, $nonstring;
        }
    }

    my $new_sql = join "'", @result;

    # Append "FROM dual" if this is a SELECT without a FROM clause
    $new_sql .= " FROM DUAL" if ($is_select and !$has_from);

    # Wrap the query with a "WHERE rownum <= ..." if we found LIMIT
    
    if (defined($limit)) {
        if ($new_sql !~ /\bWHERE\b/) {
            $new_sql = $new_sql." WHERE 1=1";
        }
        my ($before_where, $after_where) = split(/\bWHERE\b/i, $new_sql, 2);
        if (defined($offset)) {
            my ($before_from, $after_from) = split(/\bFROM\b/i, $new_sql, 2);
            $before_where = "$before_from FROM ($before_from,"
                          . " ROW_NUMBER() OVER (ORDER BY 1) R "
                          . " FROM $after_from ) "; 
            $after_where = " R BETWEEN $offset+1 AND $limit+$offset";
        } else {
            $after_where = " rownum <=$limit AND ".$after_where;
        }
        $new_sql = $before_where." WHERE ".$after_where;
    }
    return $new_sql;
}

sub do {
    my $self = shift;
    my $sql  = shift;
    $sql = adjust_statement($sql);
    unshift @_, $sql;
    return $self->SUPER::do(@_);
}

sub selectrow_array {
    my $self = shift;
    my $stmt = shift;
    my $new_stmt = (ref $stmt) ? $stmt : adjust_statement($stmt);
    unshift @_, $new_stmt;
    if ( wantarray ) {
        my @row = $self->SUPER::selectrow_array(@_);
        _fix_arrayref(\@row);
        return @row;
    } else {
        my $row = $self->SUPER::selectrow_array(@_);
        $row = _fix_empty($row) if defined $row;
        return $row;
    }
}

sub selectrow_arrayref {
    my $self = shift;
    my $stmt = shift;
    my $new_stmt = (ref $stmt) ? $stmt : adjust_statement($stmt);
    unshift @_, $new_stmt;
    my $ref = $self->SUPER::selectrow_arrayref(@_);
    return undef if !defined $ref;

    _fix_arrayref($ref);
    return $ref;
}

sub selectrow_hashref {
    my $self = shift;
    my $stmt = shift;
    my $new_stmt = (ref $stmt) ? $stmt : adjust_statement($stmt);
    unshift @_, $new_stmt;
    my $ref = $self->SUPER::selectrow_hashref(@_);
    return undef if !defined $ref;

    _fix_hashref($ref);
    return $ref;
}

sub selectall_arrayref {
    my $self = shift;
    my $stmt = shift;
    my $new_stmt = (ref $stmt) ? $stmt : adjust_statement($stmt);
    unshift @_, $new_stmt;
    my $ref = $self->SUPER::selectall_arrayref(@_);
    return undef if !defined $ref;
    
    foreach my $row (@$ref) {
       if (ref($row) eq 'ARRAY') {
            _fix_arrayref($row);
       }
       elsif (ref($row) eq 'HASH') {
            _fix_hashref($row);
       }
    }

    return $ref;
}

sub selectall_hashref {
    my $self = shift;
    my $stmt = shift;
    my $new_stmt = (ref $stmt) ? $stmt : adjust_statement($stmt);
    unshift @_, $new_stmt;
    my $rows = $self->SUPER::selectall_hashref(@_);
    return undef if !defined $rows;
    foreach my $row (values %$rows) { 
          _fix_hashref($row);
    }
    return $rows;
}

sub selectcol_arrayref {
    my $self = shift;
    my $stmt = shift;
    my $new_stmt = (ref $stmt) ? $stmt : adjust_statement($stmt);
    unshift @_, $new_stmt;
    my $ref = $self->SUPER::selectcol_arrayref(@_);
    return undef if !defined $ref;
    _fix_arrayref($ref);
    return $ref;
}

sub prepare {
    my $self = shift;
    my $sql  = shift;
    my $new_sql = adjust_statement($sql);
    unshift @_, $new_sql;
    return bless $self->SUPER::prepare(@_),
                        'Bugzilla::DB::Oracle::st';
}

sub prepare_cached {
    my $self = shift;
    my $sql  = shift;
    my $new_sql = adjust_statement($sql);
    unshift @_, $new_sql;
    return bless $self->SUPER::prepare_cached(@_),
                      'Bugzilla::DB::Oracle::st';
}

sub quote_identifier {
     my ($self,$id) = @_;
     return $id;
}

#####################################################################
# Protected "Real Database" Schema Information Methods
#####################################################################

sub bz_table_columns_real {
    my ($self, $table) = @_;
    $table = uc($table);
    my $cols = $self->selectcol_arrayref(
        "SELECT LOWER(COLUMN_NAME) FROM USER_TAB_COLUMNS WHERE 
         TABLE_NAME = ?  ORDER BY COLUMN_NAME", undef, $table);
    return @$cols;
}

sub bz_table_list_real {
    my ($self) = @_;
    my $tables = $self->selectcol_arrayref(
        "SELECT LOWER(TABLE_NAME) FROM USER_TABLES WHERE 
        TABLE_NAME NOT LIKE ?  ORDER BY TABLE_NAME", undef, 'DR$%');
    return @$tables;
}

#####################################################################
# Custom Database Setup
#####################################################################

sub bz_setup_database {
    my $self = shift;
    
    # Create a function that returns SYSDATE to emulate MySQL's "NOW()".
    # Function NOW() is used widely in Bugzilla SQLs, but Oracle does not 
    # have that function, So we have to create one ourself. 
    $self->do("CREATE OR REPLACE FUNCTION NOW "
              . " RETURN DATE IS BEGIN RETURN SYSDATE; END;");
    $self->do("CREATE OR REPLACE FUNCTION CHAR_LENGTH(COLUMN_NAME VARCHAR2)" 
              . " RETURN NUMBER IS BEGIN RETURN LENGTH(COLUMN_NAME); END;");
    
    # Create types for group_concat
    my $t_clob_delim = $self->selectcol_arrayref("
        SELECT TYPE_NAME FROM USER_TYPES WHERE TYPE_NAME=?",
        undef, 'T_CLOB_DELIM'); 

    if ( !@$t_clob_delim ) {
        $self->do("CREATE OR REPLACE TYPE T_CLOB_DELIM AS OBJECT "
              . "( p_CONTENT CLOB, p_DELIMITER VARCHAR2(256));");
    }

    $self->do("CREATE OR REPLACE TYPE T_GROUP_CONCAT AS OBJECT 
               (  CLOB_CONTENT CLOB,
                  DELIMITER    VARCHAR2(256),
                  STATIC FUNCTION ODCIAGGREGATEINITIALIZE(
                      SCTX IN OUT NOCOPY T_GROUP_CONCAT)
                  RETURN NUMBER,
                  MEMBER FUNCTION ODCIAGGREGATEITERATE(
                      SELF IN OUT NOCOPY T_GROUP_CONCAT,
                      VALUE IN T_CLOB_DELIM) 
                  RETURN NUMBER,
                  MEMBER FUNCTION ODCIAGGREGATETERMINATE(
                      SELF IN T_GROUP_CONCAT,
                      RETURNVALUE OUT NOCOPY CLOB,
                      FLAGS       IN NUMBER)
                  RETURN NUMBER,
                  MEMBER FUNCTION ODCIAGGREGATEMERGE(
                      SELF IN OUT NOCOPY T_GROUP_CONCAT,
                      CTX2 IN T_GROUP_CONCAT) 
                  RETURN NUMBER);");

    $self->do("CREATE OR REPLACE TYPE BODY T_GROUP_CONCAT IS
                  STATIC FUNCTION ODCIAGGREGATEINITIALIZE(
                  SCTX IN OUT NOCOPY T_GROUP_CONCAT)
                  RETURN NUMBER IS
                  BEGIN
                      SCTX := T_GROUP_CONCAT(EMPTY_CLOB(), NULL);
                      DBMS_LOB.CREATETEMPORARY(SCTX.CLOB_CONTENT, TRUE);
                      RETURN ODCICONST.SUCCESS;
                  END;
                  MEMBER FUNCTION ODCIAGGREGATEITERATE(
                      SELF IN OUT NOCOPY T_GROUP_CONCAT,
                      VALUE IN T_CLOB_DELIM) 
                  RETURN NUMBER IS
                  BEGIN
                      SELF.DELIMITER := VALUE.P_DELIMITER;
                      DBMS_LOB.WRITEAPPEND(SELF.CLOB_CONTENT, 
                                           LENGTH(SELF.DELIMITER),
                                           SELF.DELIMITER);
                      DBMS_LOB.APPEND(SELF.CLOB_CONTENT, VALUE.P_CONTENT);
  
                      RETURN ODCICONST.SUCCESS;
                  END;
                  MEMBER FUNCTION ODCIAGGREGATETERMINATE(
                      SELF IN T_GROUP_CONCAT,
                      RETURNVALUE OUT NOCOPY CLOB,
                      FLAGS IN NUMBER) 
                  RETURN NUMBER IS
                  BEGIN
                      RETURNVALUE := RTRIM(LTRIM(SELF.CLOB_CONTENT, 
                                     SELF.DELIMITER), 
                                     SELF.DELIMITER);
                      RETURN ODCICONST.SUCCESS;
                  END;
                  MEMBER FUNCTION ODCIAGGREGATEMERGE(
                      SELF IN OUT NOCOPY T_GROUP_CONCAT,
                      CTX2 IN T_GROUP_CONCAT) 
                  RETURN NUMBER IS
                  BEGIN
                      DBMS_LOB.WRITEAPPEND(SELF.CLOB_CONTENT, 
                                           LENGTH(SELF.DELIMITER), 
                                           SELF.DELIMITER);
                      DBMS_LOB.APPEND(SELF.CLOB_CONTENT, CTX2.CLOB_CONTENT);
                      RETURN ODCICONST.SUCCESS;
                  END;
               END;");

    # Create user-defined aggregate function group_concat
    $self->do("CREATE OR REPLACE FUNCTION GROUP_CONCAT(P_INPUT T_CLOB_DELIM) 
               RETURN CLOB 
               DETERMINISTIC PARALLEL_ENABLE AGGREGATE USING T_GROUP_CONCAT;");

    # Create a WORLD_LEXER named BZ_LEX for multilingual fulltext search
    my $lexer = $self->selectcol_arrayref(
       "SELECT pre_name FROM CTXSYS.CTX_PREFERENCES WHERE pre_name = ? AND
          pre_owner = ?",
          undef,'BZ_LEX',uc(Bugzilla->localconfig->{db_user}));
    if(!@$lexer) {
       $self->do("BEGIN CTX_DDL.CREATE_PREFERENCE
                        ('BZ_LEX', 'WORLD_LEXER'); END;");
    }

    $self->SUPER::bz_setup_database(@_);

    my @tables = $self->bz_table_list_real();
    foreach my $table (@tables) {
        my @columns = $self->bz_table_columns_real($table);
        foreach my $column (@columns) {
            my $def = $self->bz_column_info($table, $column);
            if ($def->{REFERENCES}) {
                my $references = $def->{REFERENCES};
                my $update = $references->{UPDATE} || 'CASCADE';
                my $to_table  = $references->{TABLE};
                my $to_column = $references->{COLUMN};
                my $fk_name = $self->_bz_schema->_get_fk_name($table,
                                                              $column,
                                                              $references);
                if ( $update =~ /CASCADE/i ){
                     my $trigger_name = uc($fk_name . "_UC");
                     my $exist_trigger = $self->selectcol_arrayref(
                         "SELECT OBJECT_NAME FROM USER_OBJECTS 
                          WHERE OBJECT_NAME = ?", undef, $trigger_name);
                    if(@$exist_trigger) {
                        $self->do("DROP TRIGGER $trigger_name");
                    }
  
                     my $tr_str = "CREATE OR REPLACE TRIGGER $trigger_name"
                         . " AFTER UPDATE OF $to_column ON $to_table "
                         . " REFERENCING "
                         . " NEW AS NEW "
                         . " OLD AS OLD "
                         . " FOR EACH ROW "
                         . " BEGIN "
                         . "     UPDATE $table"
                         . "        SET $column = :NEW.$to_column"
                         . "      WHERE $column = :OLD.$to_column;"
                         . " END $trigger_name;";
                         $self->do($tr_str);
               }
         }
     }
   }

   # Drop the trigger which causes bug 541553
   my $trigger_name = "PRODUCTS_MILESTONEURL";
   my $exist_trigger = $self->selectcol_arrayref(
       "SELECT OBJECT_NAME FROM USER_OBJECTS
        WHERE OBJECT_NAME = ?", undef, $trigger_name);
   if(@$exist_trigger) {
       $self->do("DROP TRIGGER $trigger_name");
   }
}

package Bugzilla::DB::Oracle::st;
use base qw(DBI::st);
 
sub fetchrow_arrayref {
    my $self = shift;
    my $ref = $self->SUPER::fetchrow_arrayref(@_);
    return undef if !defined $ref;
    Bugzilla::DB::Oracle::_fix_arrayref($ref);
    return $ref;
}

sub fetchrow_array {
    my $self = shift;
    if ( wantarray ) {
        my @row = $self->SUPER::fetchrow_array(@_);
        Bugzilla::DB::Oracle::_fix_arrayref(\@row);
        return @row;
    } else {
        my $row = $self->SUPER::fetchrow_array(@_);
        $row = Bugzilla::DB::Oracle::_fix_empty($row) if defined $row;
        return $row;
    }
}

sub fetchrow_hashref {
    my $self = shift;
    my $ref = $self->SUPER::fetchrow_hashref(@_);
    return undef if !defined $ref;
    Bugzilla::DB::Oracle::_fix_hashref($ref);
    return $ref;
}

sub fetchall_arrayref {
    my $self = shift;
    my $ref = $self->SUPER::fetchall_arrayref(@_);
    return undef if !defined $ref;
    foreach my $row (@$ref) {
        if (ref($row) eq 'ARRAY') {
             Bugzilla::DB::Oracle::_fix_arrayref($row);
        }
        elsif (ref($row) eq 'HASH') {
            Bugzilla::DB::Oracle::_fix_hashref($row);
        }
    }
    return $ref;
}

sub fetchall_hashref {
    my $self = shift;
    my $ref = $self->SUPER::fetchall_hashref(@_);
    return undef if !defined $ref;
    foreach my $row (values %$ref) {
         Bugzilla::DB::Oracle::_fix_hashref($row);
    }
     return $ref;
}

sub fetch {
    my $self = shift;
    my $row = $self->SUPER::fetch(@_);
    if ($row) {
      Bugzilla::DB::Oracle::_fix_arrayref($row);
    }
   return $row;
}
1;