Commit | Line | Data |
843f8ecd |
1 | package DBIx::Class::Storage::DBI::Pg; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | |
be860760 |
6 | use base qw/ |
7 | DBIx::Class::Storage::DBI::MultiColumnIn |
be860760 |
8 | /; |
ac45262b |
9 | use mro 'c3'; |
843f8ecd |
10 | |
ac45262b |
11 | use DBD::Pg qw(:pg_types); |
4d4dc518 |
12 | use Scope::Guard (); |
13 | use Context::Preserve (); |
843f8ecd |
14 | |
ac45262b |
15 | # Ask for a DBD::Pg with array support |
21c63647 |
16 | warn __PACKAGE__.": DBD::Pg 2.9.2 or greater is strongly recommended\n" |
ac45262b |
17 | if ($DBD::Pg::VERSION < 2.009002); # pg uses (used?) version::qv() |
17614944 |
18 | |
38d5ea9f |
19 | sub can_insert_returning { |
bab40dee |
20 | my $self = shift; |
21 | |
1f5aae08 |
22 | my ($major, $minor) = $self->_server_info->{dbms_ver} =~ /^(\d+)\.(\d+)/; |
bab40dee |
23 | |
24 | return 1 |
25 | if ($major > 8) || ($major == 8 && $minor >= 2); |
26 | |
27 | return 0; |
38d5ea9f |
28 | } |
29 | |
e96a93df |
30 | sub with_deferred_fk_checks { |
31 | my ($self, $sub) = @_; |
32 | |
4d4dc518 |
33 | my $txn_scope_guard = $self->txn_scope_guard; |
34 | |
35 | $self->_do_query('SET CONSTRAINTS ALL DEFERRED'); |
38d5ea9f |
36 | |
4d4dc518 |
37 | my $sg = Scope::Guard->new(sub { |
38 | $self->_do_query('SET CONSTRAINTS ALL IMMEDIATE'); |
39 | }); |
40 | |
41 | return Context::Preserve::preserve_context(sub { $sub->() }, |
42 | after => sub { $txn_scope_guard->commit }); |
e96a93df |
43 | } |
44 | |
bab40dee |
45 | # only used when INSERT ... RETURNING is disabled |
38d5ea9f |
46 | sub last_insert_id { |
47 | my ($self,$source,@cols) = @_; |
48 | |
49 | my @values; |
50 | |
51 | for my $col (@cols) { |
52 | my $seq = ( $source->column_info($col)->{sequence} ||= $self->dbh_do('_dbh_get_autoinc_seq', $source, $col) ) |
53 | or $self->throw_exception( sprintf( |
54 | 'could not determine sequence for column %s.%s, please consider adding a schema-qualified sequence to its column info', |
55 | $source->name, |
56 | $col, |
57 | )); |
58 | |
59 | push @values, $self->_dbh->last_insert_id(undef, undef, undef, undef, {sequence => $seq}); |
60 | } |
61 | |
62 | return @values; |
63 | } |
64 | |
4d4dc518 |
65 | sub _sequence_fetch { |
66 | my ($self, $function, $sequence) = @_; |
67 | |
68 | $self->throw_exception('No sequence to fetch') unless $sequence; |
38d5ea9f |
69 | |
4d4dc518 |
70 | my ($val) = $self->_get_dbh->selectrow_array( |
734868da |
71 | sprintf ("select %s('%s')", $function, $sequence) |
4d4dc518 |
72 | ); |
73 | |
74 | return $val; |
38d5ea9f |
75 | } |
9a0b7b26 |
76 | |
2d424996 |
77 | sub _dbh_get_autoinc_seq { |
78 | my ($self, $dbh, $source, $col) = @_; |
0063119f |
79 | |
2d424996 |
80 | my $schema; |
81 | my $table = $source->name; |
0063119f |
82 | |
2d424996 |
83 | # deref table name if it needs it |
84 | $table = $$table |
85 | if ref $table eq 'SCALAR'; |
0063119f |
86 | |
2d424996 |
87 | # parse out schema name if present |
88 | if( $table =~ /^(.+)\.(.+)$/ ) { |
89 | ( $schema, $table ) = ( $1, $2 ); |
90 | } |
0680ac39 |
91 | |
2d424996 |
92 | # get the column default using a Postgres-specific pg_catalog query |
93 | my $seq_expr = $self->_dbh_get_column_default( $dbh, $schema, $table, $col ); |
94 | |
95 | # if no default value is set on the column, or if we can't parse the |
96 | # default value as a sequence, throw. |
5861223d |
97 | unless ( defined $seq_expr and $seq_expr =~ /^nextval\(+'([^']+)'::(?:text|regclass)\)/i ) { |
2d424996 |
98 | $seq_expr = '' unless defined $seq_expr; |
99 | $schema = "$schema." if defined $schema && length $schema; |
d3fdc7b8 |
100 | $self->throw_exception( sprintf ( |
101 | 'no sequence found for %s%s.%s, check the RDBMS table definition or explicitly set the '. |
102 | "'sequence' for this column in %s", |
103 | $schema ? "$schema." : '', |
104 | $table, |
105 | $col, |
106 | $source->source_name, |
107 | )); |
777f7527 |
108 | } |
2d424996 |
109 | |
110 | return $1; |
777f7527 |
111 | } |
112 | |
2d424996 |
113 | # custom method for fetching column default, since column_info has a |
114 | # bug with older versions of DBD::Pg |
115 | sub _dbh_get_column_default { |
116 | my ( $self, $dbh, $schema, $table, $col ) = @_; |
117 | |
118 | # Build and execute a query into the pg_catalog to find the Pg |
119 | # expression for the default value for this column in this table. |
120 | # If the table name is schema-qualified, query using that specific |
121 | # schema name. |
122 | |
123 | # Otherwise, find the table in the standard Postgres way, using the |
124 | # search path. This is done with the pg_catalog.pg_table_is_visible |
125 | # function, which returns true if a given table is 'visible', |
126 | # meaning the first table of that name to be found in the search |
127 | # path. |
128 | |
129 | # I *think* we can be assured that this query will always find the |
130 | # correct column according to standard Postgres semantics. |
131 | # |
132 | # -- rbuels |
133 | |
134 | my $sqlmaker = $self->sql_maker; |
135 | local $sqlmaker->{bindtype} = 'normal'; |
136 | |
137 | my ($where, @bind) = $sqlmaker->where ({ |
138 | 'a.attnum' => {'>', 0}, |
139 | 'c.relname' => $table, |
140 | 'a.attname' => $col, |
141 | -not_bool => 'a.attisdropped', |
142 | (defined $schema && length $schema) |
143 | ? ( 'n.nspname' => $schema ) |
144 | : ( -bool => \'pg_catalog.pg_table_is_visible(c.oid)' ) |
145 | }); |
146 | |
147 | my ($seq_expr) = $dbh->selectrow_array(<<EOS,undef,@bind); |
148 | |
149 | SELECT |
150 | (SELECT pg_catalog.pg_get_expr(d.adbin, d.adrelid) |
151 | FROM pg_catalog.pg_attrdef d |
152 | WHERE d.adrelid = a.attrelid AND d.adnum = a.attnum AND a.atthasdef) |
153 | FROM pg_catalog.pg_class c |
154 | LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace |
155 | JOIN pg_catalog.pg_attribute a ON a.attrelid = c.oid |
156 | $where |
157 | |
158 | EOS |
159 | |
160 | return $seq_expr; |
161 | } |
162 | |
163 | |
4f533e8c |
164 | sub sqlt_type { |
165 | return 'PostgreSQL'; |
166 | } |
167 | |
45fa8288 |
168 | sub datetime_parser_type { return "DateTime::Format::Pg"; } |
169 | |
a71859b4 |
170 | sub bind_attribute_by_data_type { |
171 | my ($self,$data_type) = @_; |
172 | |
173 | my $bind_attributes = { |
eda28767 |
174 | bytea => { pg_type => DBD::Pg::PG_BYTEA }, |
5ba88f68 |
175 | blob => { pg_type => DBD::Pg::PG_BYTEA }, |
a71859b4 |
176 | }; |
d4daee7b |
177 | |
a71859b4 |
178 | if( defined $bind_attributes->{$data_type} ) { |
9fdf90df |
179 | return $bind_attributes->{$data_type}; |
a71859b4 |
180 | } |
181 | else { |
182 | return; |
183 | } |
184 | } |
185 | |
adb3554a |
186 | sub _svp_begin { |
eeb8cfeb |
187 | my ($self, $name) = @_; |
adb3554a |
188 | |
9ae966b9 |
189 | $self->_get_dbh->pg_savepoint($name); |
adb3554a |
190 | } |
191 | |
192 | sub _svp_release { |
eeb8cfeb |
193 | my ($self, $name) = @_; |
adb3554a |
194 | |
9ae966b9 |
195 | $self->_get_dbh->pg_release($name); |
adb3554a |
196 | } |
197 | |
198 | sub _svp_rollback { |
eeb8cfeb |
199 | my ($self, $name) = @_; |
adb3554a |
200 | |
9ae966b9 |
201 | $self->_get_dbh->pg_rollback_to($name); |
adb3554a |
202 | } |
203 | |
843f8ecd |
204 | 1; |
205 | |
fd159e2a |
206 | __END__ |
207 | |
75d07914 |
208 | =head1 NAME |
843f8ecd |
209 | |
210 | DBIx::Class::Storage::DBI::Pg - Automatic primary key class for PostgreSQL |
211 | |
212 | =head1 SYNOPSIS |
213 | |
d88ecca6 |
214 | # In your result (table) classes |
215 | use base 'DBIx::Class::Core'; |
843f8ecd |
216 | __PACKAGE__->set_primary_key('id'); |
217 | __PACKAGE__->sequence('mysequence'); |
218 | |
219 | =head1 DESCRIPTION |
220 | |
221 | This class implements autoincrements for PostgreSQL. |
222 | |
7c0176a1 |
223 | =head1 POSTGRESQL SCHEMA SUPPORT |
224 | |
4f609014 |
225 | This driver supports multiple PostgreSQL schemas, with one caveat: for |
6ff1d58c |
226 | performance reasons, data about the search path, sequence names, and |
227 | so forth is queried as needed and CACHED for subsequent uses. |
7c0176a1 |
228 | |
4f609014 |
229 | For this reason, once your schema is instantiated, you should not |
230 | change the PostgreSQL schema search path for that schema's database |
231 | connection. If you do, Bad Things may happen. |
232 | |
233 | You should do any necessary manipulation of the search path BEFORE |
234 | instantiating your schema object, or as part of the on_connect_do |
235 | option to connect(), for example: |
7c0176a1 |
236 | |
237 | my $schema = My::Schema->connect |
238 | ( $dsn,$user,$pass, |
239 | { on_connect_do => |
240 | [ 'SET search_path TO myschema, foo, public' ], |
241 | }, |
242 | ); |
243 | |
7ff926e6 |
244 | =head1 AUTHORS |
7c0176a1 |
245 | |
7ff926e6 |
246 | See L<DBIx::Class/CONTRIBUTORS> |
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247 | |
248 | =head1 LICENSE |
249 | |
250 | You may distribute this code under the same terms as Perl itself. |
251 | |
252 | =cut |