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package DBIx::Class::ResultSource::View; |
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use strict; |
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use warnings; |
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use base 'DBIx::Class::ResultSource'; |
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__PACKAGE__->mk_group_accessors( rsrc_instance_specific_attribute => qw( |
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is_virtual view_definition deploy_depends_on |
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)); |
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=head1 NAME |
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DBIx::Class::ResultSource::View - ResultSource object representing a view |
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=head1 SYNOPSIS |
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package MyApp::Schema::Result::Year2000CDs; |
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use base qw/DBIx::Class::Core/; |
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__PACKAGE__->table_class('DBIx::Class::ResultSource::View'); |
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__PACKAGE__->table('year2000cds'); |
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__PACKAGE__->result_source->is_virtual(1); |
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__PACKAGE__->result_source->view_definition( |
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"SELECT cdid, artist, title FROM cd WHERE year ='2000'" |
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); |
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__PACKAGE__->add_columns( |
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'cdid' => { |
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data_type => 'integer', |
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is_auto_increment => 1, |
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}, |
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'artist' => { |
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data_type => 'integer', |
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}, |
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'title' => { |
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data_type => 'varchar', |
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size => 100, |
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}, |
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); |
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=head1 DESCRIPTION |
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View object that inherits from L |
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This class extends ResultSource to add basic view support. |
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A view has a L, which contains a SQL query. The query can |
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only have parameters if L is set to true. It may contain JOINs, |
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sub selects and any other SQL your database supports. |
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View definition SQL is deployed to your database on |
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L unless you set L to true. |
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Deploying the view does B translate it between different database |
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syntaxes, so be careful what you write in your view SQL. |
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Virtual views (L true), are assumed to not |
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exist in your database as a real view. The L in this |
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case replaces the view name in a FROM clause in a subselect. |
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=head1 EXAMPLES |
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Having created the MyApp::Schema::Year2000CDs schema as shown in the SYNOPSIS |
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above, you can then: |
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$y2000_cds = $schema->resultset('Year2000CDs') |
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->search() |
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->all(); |
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$count = $schema->resultset('Year2000CDs') |
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->search() |
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->count(); |
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If you modified the schema to include a placeholder |
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__PACKAGE__->result_source->view_definition( |
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"SELECT cdid, artist, title FROM cd WHERE year = ?" |
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); |
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and ensuring you have is_virtual set to true: |
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__PACKAGE__->result_source->is_virtual(1); |
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You could now say: |
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$y2001_cds = $schema->resultset('Year2000CDs') |
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->search({}, { bind => [2001] }) |
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->all(); |
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$count = $schema->resultset('Year2000CDs') |
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->search({}, { bind => [2001] }) |
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->count(); |
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=head1 SQL EXAMPLES |
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=over |
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=item is_virtual set to false |
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$schema->resultset('Year2000CDs')->all(); |
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SELECT cdid, artist, title FROM year2000cds me |
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=item is_virtual set to true |
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$schema->resultset('Year2000CDs')->all(); |
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SELECT cdid, artist, title FROM |
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(SELECT cdid, artist, title FROM cd WHERE year ='2000') me |
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=back |
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=head1 METHODS |
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=head2 is_virtual |
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__PACKAGE__->result_source->is_virtual(1); |
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Set to true for a virtual view, false or unset for a real |
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database-based view. |
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=head2 view_definition |
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__PACKAGE__->result_source->view_definition( |
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"SELECT cdid, artist, title FROM cd WHERE year ='2000'" |
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); |
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An SQL query for your view. Will not be translated across database |
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syntaxes. |
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=head2 deploy_depends_on |
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__PACKAGE__->result_source->deploy_depends_on( |
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["MyApp::Schema::Result::Year","MyApp::Schema::Result::CD"] |
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); |
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Specify the views (and only the views) that this view depends on. |
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Pass this an array reference of fully qualified result classes. |
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=head1 OVERRIDDEN METHODS |
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=head2 from |
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Returns the FROM entry for the table (i.e. the view name) |
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or the SQL as a subselect if this is a virtual view. |
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=cut |
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sub from { |
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$_[0]->throw_exception('from() is not a setter method') if @_ > 1; |
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$_[0]->is_virtual |
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? \( '(' . $_[0]->view_definition .')' ) |
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: $_[0]->name |
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; |
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} |
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=head1 OTHER METHODS |
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=head2 new |
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The constructor. |
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=cut |
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sub new { |
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my ( $self, @args ) = @_; |
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my $new = $self->next::method(@args); |
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$new->{deploy_depends_on} = |
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{ map { $_ => 1 } |
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@{ $new->{deploy_depends_on} || [] } } |
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unless ref $new->{deploy_depends_on} eq 'HASH'; |
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return $new; |
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} |
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=head1 FURTHER QUESTIONS? |
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Check the list of L. |
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=head1 COPYRIGHT AND LICENSE |
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This module is free software L |
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by the L. You can |
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redistribute it and/or modify it under the same terms as the |
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L. |
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=cut |
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1; |