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843f8ecd |
1 | package DBIx::Class::Storage::DBI::Pg; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | |
4ce3b851 |
6 | use base qw/DBIx::Class::Storage::DBI::MultiColumnIn/; |
ac45262b |
7 | use mro 'c3'; |
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8 | |
ac45262b |
9 | use DBD::Pg qw(:pg_types); |
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10 | |
ac45262b |
11 | # Ask for a DBD::Pg with array support |
c70c716e |
12 | warn "DBD::Pg 2.9.2 or greater is strongly recommended\n" |
ac45262b |
13 | if ($DBD::Pg::VERSION < 2.009002); # pg uses (used?) version::qv() |
17614944 |
14 | |
e96a93df |
15 | sub with_deferred_fk_checks { |
16 | my ($self, $sub) = @_; |
17 | |
9ae966b9 |
18 | $self->_get_dbh->do('SET CONSTRAINTS ALL DEFERRED'); |
e96a93df |
19 | $sub->(); |
20 | } |
21 | |
843f8ecd |
22 | sub last_insert_id { |
ca48cd7d |
23 | my ($self,$source,$col) = @_; |
5f70776f |
24 | my $seq = ($source->column_info($col)->{sequence} ||= $self->get_autoinc_seq($source,$col)) |
25 | or $self->throw_exception( "could not determine sequence for " |
26 | . $source->name |
27 | . ".$col, please consider adding a " |
28 | . "schema-qualified sequence to its column info" |
29 | ); |
9a0b7b26 |
30 | |
31 | $self->_dbh_last_insert_id ($self->_dbh, $seq); |
0680ac39 |
32 | } |
33 | |
9a0b7b26 |
34 | # there seems to be absolutely no reason to have this as a separate method, |
35 | # but leaving intact in case someone is already overriding it |
36 | sub _dbh_last_insert_id { |
37 | my ($self, $dbh, $seq) = @_; |
38 | $dbh->last_insert_id(undef, undef, undef, undef, {sequence => $seq}); |
39 | } |
40 | |
41 | |
6ff1d58c |
42 | # get the postgres search path, and cache it |
1ff9c30d |
43 | sub _get_pg_search_path { |
44 | my ($self,$dbh) = @_; |
45 | # cache the search path as ['schema','schema',...] in the storage |
46 | # obj |
47 | $self->{_pg_search_path} ||= do { |
48 | my @search_path; |
49 | my ($sp_string) = $dbh->selectrow_array('SHOW search_path'); |
50 | while( $sp_string =~ s/("[^"]+"|[^,]+),?// ) { |
51 | unless( defined $1 and length $1 ) { |
52 | $self->throw_exception("search path sanity check failed: '$1'") |
53 | } |
54 | push @search_path, $1; |
55 | } |
56 | \@search_path |
57 | }; |
58 | } |
59 | |
d4f16b21 |
60 | sub _dbh_get_autoinc_seq { |
c01a6b75 |
61 | my ($self, $dbh, $schema, $table, $col) = @_; |
0680ac39 |
62 | |
c01a6b75 |
63 | |
5e14a204 |
64 | my @where = ( 'c.relname = ?', 'a.attname = ?' ); |
65 | my @bind = ($table, $col); |
66 | if( defined $schema && length $schema ) { |
67 | push @where, 'n.nspname = ?'; |
68 | push @bind, $schema; |
69 | } else { |
70 | push @where, 'pg_catalog.pg_table_is_visible(c.oid)'; |
c01a6b75 |
71 | } |
5e14a204 |
72 | my $where = join ' AND ', @where; |
73 | |
74 | my ($seq_expr) = $dbh->selectrow_array(<<EOS,undef,@bind); |
75 | SELECT |
76 | (SELECT pg_catalog.pg_get_expr(d.adbin, d.adrelid) |
77 | FROM pg_catalog.pg_attrdef d |
78 | WHERE d.adrelid = a.attrelid AND d.adnum = a.attnum AND a.atthasdef) |
79 | FROM pg_catalog.pg_class c |
80 | JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace |
81 | JOIN pg_catalog.pg_attribute a ON a.attrelid = c.oid |
82 | WHERE |
83 | $where |
84 | AND a.attnum > 0 AND NOT a.attisdropped |
85 | EOS |
86 | |
87 | $seq_expr =~ /^nextval\(+'([^']+)'::(?:text|regclass)\)/i |
88 | or $self->throw_exception("could not parse sequence expression '$seq_expr'"); |
89 | |
90 | return $1; |
843f8ecd |
91 | } |
92 | |
93 | sub get_autoinc_seq { |
ca48cd7d |
94 | my ($self,$source,$col) = @_; |
d4daee7b |
95 | |
80625830 |
96 | my $schema; |
97 | my $table = $source->name; |
98 | |
99 | if (ref $table eq 'SCALAR') { |
100 | $table = $$table; |
101 | } |
102 | elsif ($table =~ /^(.+)\.(.+)$/) { |
103 | ($schema, $table) = ($1, $2); |
104 | } |
a9f32dbc |
105 | |
c01a6b75 |
106 | $self->dbh_do('_dbh_get_autoinc_seq', $schema, $table, $col); |
843f8ecd |
107 | } |
108 | |
4f533e8c |
109 | sub sqlt_type { |
110 | return 'PostgreSQL'; |
111 | } |
112 | |
45fa8288 |
113 | sub datetime_parser_type { return "DateTime::Format::Pg"; } |
114 | |
a71859b4 |
115 | sub bind_attribute_by_data_type { |
116 | my ($self,$data_type) = @_; |
117 | |
118 | my $bind_attributes = { |
eda28767 |
119 | bytea => { pg_type => DBD::Pg::PG_BYTEA }, |
5ba88f68 |
120 | blob => { pg_type => DBD::Pg::PG_BYTEA }, |
a71859b4 |
121 | }; |
d4daee7b |
122 | |
a71859b4 |
123 | if( defined $bind_attributes->{$data_type} ) { |
9fdf90df |
124 | return $bind_attributes->{$data_type}; |
a71859b4 |
125 | } |
126 | else { |
127 | return; |
128 | } |
129 | } |
130 | |
f04b2839 |
131 | sub _sequence_fetch { |
132 | my ( $self, $type, $seq ) = @_; |
9ae966b9 |
133 | my ($id) = $self->_get_dbh->selectrow_array("SELECT nextval('${seq}')"); |
f04b2839 |
134 | return $id; |
135 | } |
136 | |
adb3554a |
137 | sub _svp_begin { |
eeb8cfeb |
138 | my ($self, $name) = @_; |
adb3554a |
139 | |
9ae966b9 |
140 | $self->_get_dbh->pg_savepoint($name); |
adb3554a |
141 | } |
142 | |
143 | sub _svp_release { |
eeb8cfeb |
144 | my ($self, $name) = @_; |
adb3554a |
145 | |
9ae966b9 |
146 | $self->_get_dbh->pg_release($name); |
adb3554a |
147 | } |
148 | |
149 | sub _svp_rollback { |
eeb8cfeb |
150 | my ($self, $name) = @_; |
adb3554a |
151 | |
9ae966b9 |
152 | $self->_get_dbh->pg_rollback_to($name); |
adb3554a |
153 | } |
154 | |
843f8ecd |
155 | 1; |
156 | |
fd159e2a |
157 | __END__ |
158 | |
75d07914 |
159 | =head1 NAME |
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160 | |
161 | DBIx::Class::Storage::DBI::Pg - Automatic primary key class for PostgreSQL |
162 | |
163 | =head1 SYNOPSIS |
164 | |
165 | # In your table classes |
166 | __PACKAGE__->load_components(qw/PK::Auto Core/); |
167 | __PACKAGE__->set_primary_key('id'); |
168 | __PACKAGE__->sequence('mysequence'); |
169 | |
170 | =head1 DESCRIPTION |
171 | |
172 | This class implements autoincrements for PostgreSQL. |
173 | |
7c0176a1 |
174 | =head1 POSTGRESQL SCHEMA SUPPORT |
175 | |
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176 | This driver supports multiple PostgreSQL schemas, with one caveat: for |
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177 | performance reasons, data about the search path, sequence names, and |
178 | so forth is queried as needed and CACHED for subsequent uses. |
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179 | |
4f609014 |
180 | For this reason, once your schema is instantiated, you should not |
181 | change the PostgreSQL schema search path for that schema's database |
182 | connection. If you do, Bad Things may happen. |
183 | |
184 | You should do any necessary manipulation of the search path BEFORE |
185 | instantiating your schema object, or as part of the on_connect_do |
186 | option to connect(), for example: |
7c0176a1 |
187 | |
188 | my $schema = My::Schema->connect |
189 | ( $dsn,$user,$pass, |
190 | { on_connect_do => |
191 | [ 'SET search_path TO myschema, foo, public' ], |
192 | }, |
193 | ); |
194 | |
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195 | =head1 AUTHORS |
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196 | |
7ff926e6 |
197 | See L<DBIx::Class/CONTRIBUTORS> |
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198 | |
199 | =head1 LICENSE |
200 | |
201 | You may distribute this code under the same terms as Perl itself. |
202 | |
203 | =cut |