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1 | package DBIx::Class::ResultSource::View; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | |
6 | use DBIx::Class::ResultSet; |
7 | |
8 | use base qw/DBIx::Class/; |
9 | __PACKAGE__->load_components(qw/ResultSource/); |
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10 | __PACKAGE__->mk_group_accessors( |
11 | 'simple' => qw(is_virtual view_definition) |
12 | ); |
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13 | |
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14 | =head1 NAME |
15 | |
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16 | DBIx::Class::ResultSource::View - ResultSource object representing a view |
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17 | |
18 | =head1 SYNOPSIS |
19 | |
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20 | package MyDB::Schema::Result::Year2000CDs; |
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21 | |
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22 | use base qw/DBIx::Class/; |
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23 | use DBIx::Class::ResultSource::View; |
24 | |
25 | __PACKAGE__->load_components('Core'); |
26 | __PACKAGE__->table_class('DBIx::Class::ResultSource::View'); |
27 | |
28 | __PACKAGE__->table('year2000cds'); |
29 | __PACKAGE__->result_source_instance->is_virtual(1); |
30 | __PACKAGE__->result_source_instance->view_definition( |
31 | "SELECT cdid, artist, title FROM cd WHERE year ='2000'" |
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32 | ); |
33 | __PACKAGE__->add_columns( |
34 | 'cdid' => { |
35 | data_type => 'integer', |
36 | is_auto_increment => 1, |
37 | }, |
38 | 'artist' => { |
39 | data_type => 'integer', |
40 | }, |
41 | 'title' => { |
42 | data_type => 'varchar', |
43 | size => 100, |
44 | }, |
45 | ); |
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46 | |
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47 | =head1 DESCRIPTION |
48 | |
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49 | View object that inherits from L<DBIx::Class::ResultSource> |
50 | |
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51 | This class extends ResultSource to add basic view support. |
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52 | |
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53 | A view has a L</view_definition>, which contains a SQL query. The query can |
54 | only have parameters if L</is_virtual> is set to true. It may contain JOINs, |
55 | sub selects and any other SQL your database supports. |
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56 | |
57 | View definition SQL is deployed to your database on |
58 | L<DBIx::Class::Schema/deploy> unless you set L</is_virtual> to true. |
59 | |
60 | Deploying the view does B<not> translate it between different database |
61 | syntaxes, so be careful what you write in your view SQL. |
62 | |
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63 | Virtual views (L</is_virtual> true), are assumed to not |
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64 | exist in your database as a real view. The L</view_definition> in this |
65 | case replaces the view name in a FROM clause in a subselect. |
66 | |
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67 | =head1 EXAMPLES |
68 | |
69 | Having created the MyDB::Schema::Year2000CDs schema as shown in the SYNOPSIS |
70 | above, you can then: |
71 | |
72 | $2000_cds = $schema->resultset('Year2000CDs') |
73 | ->search() |
74 | ->all(); |
75 | $count = $schema->resultset('Year2000CDs') |
76 | ->search() |
77 | ->count(); |
78 | |
79 | If you modified the schema to include a placeholder |
80 | |
81 | __PACKAGE__->result_source_instance->view_definition( |
82 | "SELECT cdid, artist, title FROM cd WHERE year ='?'" |
83 | ); |
84 | |
85 | and ensuring you have is_virtual set to true: |
86 | |
87 | __PACKAGE__->result_source_instance->is_virtual(1); |
88 | |
89 | You could now say: |
90 | |
91 | $2001_cds = $schema->resultset('Year2000CDs') |
92 | ->search({}, { bind => [2001] }) |
93 | ->all(); |
94 | $count = $schema->resultset('Year2000CDs') |
95 | ->search({}, { bind => [2001] }) |
96 | ->count(); |
97 | |
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98 | =head1 SQL EXAMPLES |
99 | |
100 | =over |
101 | |
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102 | =item is_virtual set to false |
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103 | |
104 | $schema->resultset('Year2000CDs')->all(); |
105 | |
106 | SELECT cdid, artist, title FROM year2000cds me |
107 | |
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108 | =item is_virtual set to true |
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109 | |
110 | $schema->resultset('Year2000CDs')->all(); |
111 | |
112 | SELECT cdid, artist, title FROM |
113 | (SELECT cdid, artist, title FROM cd WHERE year ='2000') me |
114 | |
115 | =back |
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116 | |
117 | =head1 METHODS |
118 | |
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119 | =head2 is_virtual |
120 | |
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121 | __PACKAGE__->result_source_instance->is_virtual(1); |
122 | |
123 | Set to true for a virtual view, false or unset for a real |
124 | database-based view. |
125 | |
126 | =head2 view_definition |
127 | |
128 | __PACKAGE__->result_source_instance->view_definition( |
129 | "SELECT cdid, artist, title FROM cd WHERE year ='2000'" |
130 | ); |
131 | |
132 | An SQL query for your view. Will not be translated across database |
133 | syntaxes. |
134 | |
135 | |
136 | =head1 OVERRIDDEN METHODS |
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137 | |
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138 | =head2 from |
139 | |
140 | Returns the FROM entry for the table (i.e. the view name) |
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141 | or the SQL as a subselect if this is a virtual view. |
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142 | |
143 | =cut |
144 | |
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145 | sub from { |
146 | my $self = shift; |
147 | return \"(${\$self->view_definition})" if $self->is_virtual; |
148 | return $self->name; |
149 | } |
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150 | |
151 | 1; |
152 | |
153 | =head1 AUTHORS |
154 | |
155 | Matt S. Trout <mst@shadowcatsystems.co.uk> |
156 | |
157 | With Contributions from: |
158 | |
159 | Guillermo Roditi E<lt>groditi@cpan.orgE<gt> |
160 | |
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161 | Jess Robinson <castaway@desert-island.me.uk> |
162 | |
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163 | Wallace Reis <wreis@cpan.org> |
164 | |
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165 | =head1 LICENSE |
166 | |
167 | You may distribute this code under the same terms as Perl itself. |
168 | |
169 | =cut |
170 | |