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 ($DBD::Pg::VERSION < 2.009002); # pg uses (used?) version::qv() |
17614944 |
18 | |
38d5ea9f |
19 | sub can_insert_returning { |
20 | # FIXME !!! |
21 | # pg before 8.2 doesn't support this, need to check version |
22 | return 1; |
23 | } |
24 | |
e96a93df |
25 | sub with_deferred_fk_checks { |
26 | my ($self, $sub) = @_; |
27 | |
4d4dc518 |
28 | my $txn_scope_guard = $self->txn_scope_guard; |
29 | |
30 | $self->_do_query('SET CONSTRAINTS ALL DEFERRED'); |
38d5ea9f |
31 | |
4d4dc518 |
32 | my $sg = Scope::Guard->new(sub { |
33 | $self->_do_query('SET CONSTRAINTS ALL IMMEDIATE'); |
34 | }); |
35 | |
36 | return Context::Preserve::preserve_context(sub { $sub->() }, |
37 | after => sub { $txn_scope_guard->commit }); |
e96a93df |
38 | } |
39 | |
38d5ea9f |
40 | sub last_insert_id { |
41 | my ($self,$source,@cols) = @_; |
42 | |
43 | my @values; |
44 | |
45 | for my $col (@cols) { |
46 | my $seq = ( $source->column_info($col)->{sequence} ||= $self->dbh_do('_dbh_get_autoinc_seq', $source, $col) ) |
47 | or $self->throw_exception( sprintf( |
48 | 'could not determine sequence for column %s.%s, please consider adding a schema-qualified sequence to its column info', |
49 | $source->name, |
50 | $col, |
51 | )); |
52 | |
53 | push @values, $self->_dbh->last_insert_id(undef, undef, undef, undef, {sequence => $seq}); |
54 | } |
55 | |
56 | return @values; |
57 | } |
58 | |
4d4dc518 |
59 | sub _sequence_fetch { |
60 | my ($self, $function, $sequence) = @_; |
61 | |
62 | $self->throw_exception('No sequence to fetch') unless $sequence; |
38d5ea9f |
63 | |
4d4dc518 |
64 | my ($val) = $self->_get_dbh->selectrow_array( |
65 | sprintf "select $function('%s')", |
66 | $sequence |
67 | ); |
68 | |
69 | return $val; |
38d5ea9f |
70 | } |
9a0b7b26 |
71 | |
2d424996 |
72 | sub _dbh_get_autoinc_seq { |
73 | my ($self, $dbh, $source, $col) = @_; |
0063119f |
74 | |
2d424996 |
75 | my $schema; |
76 | my $table = $source->name; |
0063119f |
77 | |
2d424996 |
78 | # deref table name if it needs it |
79 | $table = $$table |
80 | if ref $table eq 'SCALAR'; |
0063119f |
81 | |
2d424996 |
82 | # parse out schema name if present |
83 | if( $table =~ /^(.+)\.(.+)$/ ) { |
84 | ( $schema, $table ) = ( $1, $2 ); |
85 | } |
0680ac39 |
86 | |
2d424996 |
87 | # get the column default using a Postgres-specific pg_catalog query |
88 | my $seq_expr = $self->_dbh_get_column_default( $dbh, $schema, $table, $col ); |
89 | |
90 | # if no default value is set on the column, or if we can't parse the |
91 | # default value as a sequence, throw. |
5861223d |
92 | unless ( defined $seq_expr and $seq_expr =~ /^nextval\(+'([^']+)'::(?:text|regclass)\)/i ) { |
2d424996 |
93 | $seq_expr = '' unless defined $seq_expr; |
94 | $schema = "$schema." if defined $schema && length $schema; |
d3fdc7b8 |
95 | $self->throw_exception( sprintf ( |
96 | 'no sequence found for %s%s.%s, check the RDBMS table definition or explicitly set the '. |
97 | "'sequence' for this column in %s", |
98 | $schema ? "$schema." : '', |
99 | $table, |
100 | $col, |
101 | $source->source_name, |
102 | )); |
777f7527 |
103 | } |
2d424996 |
104 | |
105 | return $1; |
777f7527 |
106 | } |
107 | |
2d424996 |
108 | # custom method for fetching column default, since column_info has a |
109 | # bug with older versions of DBD::Pg |
110 | sub _dbh_get_column_default { |
111 | my ( $self, $dbh, $schema, $table, $col ) = @_; |
112 | |
113 | # Build and execute a query into the pg_catalog to find the Pg |
114 | # expression for the default value for this column in this table. |
115 | # If the table name is schema-qualified, query using that specific |
116 | # schema name. |
117 | |
118 | # Otherwise, find the table in the standard Postgres way, using the |
119 | # search path. This is done with the pg_catalog.pg_table_is_visible |
120 | # function, which returns true if a given table is 'visible', |
121 | # meaning the first table of that name to be found in the search |
122 | # path. |
123 | |
124 | # I *think* we can be assured that this query will always find the |
125 | # correct column according to standard Postgres semantics. |
126 | # |
127 | # -- rbuels |
128 | |
129 | my $sqlmaker = $self->sql_maker; |
130 | local $sqlmaker->{bindtype} = 'normal'; |
131 | |
132 | my ($where, @bind) = $sqlmaker->where ({ |
133 | 'a.attnum' => {'>', 0}, |
134 | 'c.relname' => $table, |
135 | 'a.attname' => $col, |
136 | -not_bool => 'a.attisdropped', |
137 | (defined $schema && length $schema) |
138 | ? ( 'n.nspname' => $schema ) |
139 | : ( -bool => \'pg_catalog.pg_table_is_visible(c.oid)' ) |
140 | }); |
141 | |
142 | my ($seq_expr) = $dbh->selectrow_array(<<EOS,undef,@bind); |
143 | |
144 | SELECT |
145 | (SELECT pg_catalog.pg_get_expr(d.adbin, d.adrelid) |
146 | FROM pg_catalog.pg_attrdef d |
147 | WHERE d.adrelid = a.attrelid AND d.adnum = a.attnum AND a.atthasdef) |
148 | FROM pg_catalog.pg_class c |
149 | LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace |
150 | JOIN pg_catalog.pg_attribute a ON a.attrelid = c.oid |
151 | $where |
152 | |
153 | EOS |
154 | |
155 | return $seq_expr; |
156 | } |
157 | |
158 | |
4f533e8c |
159 | sub sqlt_type { |
160 | return 'PostgreSQL'; |
161 | } |
162 | |
45fa8288 |
163 | sub datetime_parser_type { return "DateTime::Format::Pg"; } |
164 | |
a71859b4 |
165 | sub bind_attribute_by_data_type { |
166 | my ($self,$data_type) = @_; |
167 | |
168 | my $bind_attributes = { |
eda28767 |
169 | bytea => { pg_type => DBD::Pg::PG_BYTEA }, |
5ba88f68 |
170 | blob => { pg_type => DBD::Pg::PG_BYTEA }, |
a71859b4 |
171 | }; |
d4daee7b |
172 | |
a71859b4 |
173 | if( defined $bind_attributes->{$data_type} ) { |
9fdf90df |
174 | return $bind_attributes->{$data_type}; |
a71859b4 |
175 | } |
176 | else { |
177 | return; |
178 | } |
179 | } |
180 | |
adb3554a |
181 | sub _svp_begin { |
eeb8cfeb |
182 | my ($self, $name) = @_; |
adb3554a |
183 | |
9ae966b9 |
184 | $self->_get_dbh->pg_savepoint($name); |
adb3554a |
185 | } |
186 | |
187 | sub _svp_release { |
eeb8cfeb |
188 | my ($self, $name) = @_; |
adb3554a |
189 | |
9ae966b9 |
190 | $self->_get_dbh->pg_release($name); |
adb3554a |
191 | } |
192 | |
193 | sub _svp_rollback { |
eeb8cfeb |
194 | my ($self, $name) = @_; |
adb3554a |
195 | |
9ae966b9 |
196 | $self->_get_dbh->pg_rollback_to($name); |
adb3554a |
197 | } |
198 | |
843f8ecd |
199 | 1; |
200 | |
fd159e2a |
201 | __END__ |
202 | |
75d07914 |
203 | =head1 NAME |
843f8ecd |
204 | |
205 | DBIx::Class::Storage::DBI::Pg - Automatic primary key class for PostgreSQL |
206 | |
207 | =head1 SYNOPSIS |
208 | |
d88ecca6 |
209 | # In your result (table) classes |
210 | use base 'DBIx::Class::Core'; |
843f8ecd |
211 | __PACKAGE__->set_primary_key('id'); |
212 | __PACKAGE__->sequence('mysequence'); |
213 | |
214 | =head1 DESCRIPTION |
215 | |
216 | This class implements autoincrements for PostgreSQL. |
217 | |
7c0176a1 |
218 | =head1 POSTGRESQL SCHEMA SUPPORT |
219 | |
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220 | This driver supports multiple PostgreSQL schemas, with one caveat: for |
6ff1d58c |
221 | performance reasons, data about the search path, sequence names, and |
222 | so forth is queried as needed and CACHED for subsequent uses. |
7c0176a1 |
223 | |
4f609014 |
224 | For this reason, once your schema is instantiated, you should not |
225 | change the PostgreSQL schema search path for that schema's database |
226 | connection. If you do, Bad Things may happen. |
227 | |
228 | You should do any necessary manipulation of the search path BEFORE |
229 | instantiating your schema object, or as part of the on_connect_do |
230 | option to connect(), for example: |
7c0176a1 |
231 | |
232 | my $schema = My::Schema->connect |
233 | ( $dsn,$user,$pass, |
234 | { on_connect_do => |
235 | [ 'SET search_path TO myschema, foo, public' ], |
236 | }, |
237 | ); |
238 | |
7ff926e6 |
239 | =head1 AUTHORS |
7c0176a1 |
240 | |
7ff926e6 |
241 | See L<DBIx::Class/CONTRIBUTORS> |
843f8ecd |
242 | |
243 | =head1 LICENSE |
244 | |
245 | You may distribute this code under the same terms as Perl itself. |
246 | |
247 | =cut |