summaryrefslogtreecommitdiffstats
path: root/Bugzilla/DB/Pg.pm
blob: de3260e7a4017ed15d33d52b98d2fbd68559463a (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
# -*- 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): Dave Miller <davem00@aol.com>
#                 Gayathri Swaminath <gayathrik00@aol.com>
#                 Jeroen Ruigrok van der Werven <asmodai@wxs.nl>
#                 Dave Lawrence <dkl@redhat.com>
#                 Tomas Kopal <Tomas.Kopal@altap.cz>

=head1 NAME

Bugzilla::DB::Pg - Bugzilla database compatibility layer for PostgreSQL

=head1 DESCRIPTION

This module overrides methods of the Bugzilla::DB module with PostgreSQL
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::Pg;

use strict;

use Bugzilla::Error;

# This module extends the DB interface via inheritance
use base qw(Bugzilla::DB);

use constant REQUIRED_VERSION => '7.03.0000';
use constant PROGRAM_NAME => 'PostgreSQL';
use constant MODULE_NAME  => 'Pg';

sub new {
    my ($class, $user, $pass, $host, $dbname, $port) = @_;

    # The default database name for PostgreSQL. We have
    # to connect to SOME database, even if we have
    # no $dbname parameter.
    $dbname ||= 'template1';

    # construct the DSN from the parameters we got
    my $dsn = "DBI:Pg:host=$host;dbname=$dbname";
    $dsn .= ";port=$port" if $port;
   
    my $self = $class->db_new($dsn, $user, $pass);

    # all class local variables stored in DBI derived class needs to have
    # a prefix 'private_'. See DBI documentation.
    $self->{private_bz_tables_locked} = 0;

    bless ($self, $class);

    return $self;
}

# if last_insert_id is supported on PostgreSQL by lowest DBI/DBD version
# supported by Bugzilla, this implementation can be removed.
sub bz_last_key {
    my ($self, $table, $column) = @_;

    my $seq = $table . "_" . $column . "_seq";
    my ($last_insert_id) = $self->selectrow_array("SELECT CURRVAL('$seq')");

    return $last_insert_id;
}

sub sql_regexp {
    return "~";
}

sub sql_not_regexp {
    return "!~" 
}

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

    if (defined($offset)) {
        return "LIMIT $limit OFFSET $offset";
    } else {
        return "LIMIT $limit";
    }
}

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

    return "TO_CHAR($date, 'J')::int";
}

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_interval {
    my ($self, $interval) = @_;
    
    return "INTERVAL '$interval'";
}

sub sql_string_concat {
    my ($self, @params) = @_;
    
    # Postgres 7.3 does not support concatenating of different types, so we
    # need to cast both parameters to text. Version 7.4 seems to handle this
    # properly, so when we stop support 7.3, this can be removed.
    return 'CAST(' . join(' AS text) || CAST(', @params) . ' AS text)';
}

sub bz_lock_tables {
    my ($self, @tables) = @_;
   
    # Check first if there was no lock before
    if ($self->{private_bz_tables_locked}) {
        ThrowCodeError("already_locked");
    } else {
        my %read_tables;
        my %write_tables;
        foreach my $table (@tables) {
            $table =~ /^([\d\w]+)([\s]+AS[\s]+[\d\w]+)?[\s]+(WRITE|READ)$/i;
            my $table_name = $1;
            if ($3 =~ /READ/i) {
                if (!exists $read_tables{$table_name}) {
                    $read_tables{$table_name} = undef;
                }
            }
            else {
                if (!exists $write_tables{$table_name}) {
                    $write_tables{$table_name} = undef;
                }
            }
        }
    
        # Begin Transaction
        $self->bz_start_transaction();
        
        Bugzilla->dbh->do('LOCK TABLE ' . join(', ', keys %read_tables) .
                          ' IN ROW SHARE MODE') if keys %read_tables;
        Bugzilla->dbh->do('LOCK TABLE ' . join(', ', keys %write_tables) .
                          ' IN ROW EXCLUSIVE MODE') if keys %write_tables;
        $self->{private_bz_tables_locked} = 1;
    }
}

sub bz_unlock_tables {
    my ($self, $abort) = @_;
    
    # Check first if there was previous matching lock
    if (!$self->{private_bz_tables_locked}) {
        # Abort is allowed even without previous lock for error handling
        return if $abort;
        ThrowCodeError("no_matching_lock");
    } else {
        $self->{private_bz_tables_locked} = 0;
        # End transaction, tables will be unlocked automatically
        if ($abort) {
            $self->bz_rollback_transaction();
        } else {
            $self->bz_commit_transaction();
        }
    }
}

1;