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# -*- 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;
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