DBIx::Class::ResultSource::View(3)

NAME
DBIx::Class::ResultSource::View - ResultSource object representing a view

SYNOPSIS
  package MyApp::Schema::Result::Year2000CDs;

  use base qw/DBIx::Class::Core/;

  __PACKAGE__->table_class('DBIx::Class::ResultSource::View');

  __PACKAGE__->table('year2000cds');
  __PACKAGE__->result_source_instance->is_virtual(1);
  __PACKAGE__->result_source_instance->view_definition(
      "SELECT cdid, artist, title FROM cd WHERE year ='2000'"
  );
  __PACKAGE__->add_columns(
    'cdid' => {
      data_type => 'integer',
      is_auto_increment => 1,
    },
    'artist' => {
      data_type => 'integer',
    },
    'title' => {
      data_type => 'varchar',
      size      => 100,
    },
  );

DESCRIPTION
View object that inherits from DBIx::Class::ResultSource

This class extends ResultSource to add basic view support.

A view has a "view_definition", which contains a SQL query. The query can only have parameters if "is_virtual" is set to true. It may contain JOINs, sub selects and any other SQL your database supports.

View definition SQL is deployed to your database on "deploy" in DBIx::Class::Schema unless you set "is_virtual" to true.

Deploying the view does not translate it between different database syntaxes, so be careful what you write in your view SQL.

Virtual views ("is_virtual" true), are assumed to not exist in your database as a real view. The "view_definition" in this case replaces the view name in a FROM clause in a subselect.

EXAMPLES
Having created the MyApp::Schema::Year2000CDs schema as shown in the SYNOPSIS above, you can then:

  $2000_cds = $schema->resultset('Year2000CDs')
                     ->search()
                     ->all();
  $count    = $schema->resultset('Year2000CDs')
                     ->search()
                     ->count();

If you modified the schema to include a placeholder

  __PACKAGE__->result_source_instance->view_definition(
      "SELECT cdid, artist, title FROM cd WHERE year = ?"
  );

and ensuring you have is_virtual set to true:

  __PACKAGE__->result_source_instance->is_virtual(1);

You could now say:

  $2001_cds = $schema->resultset('Year2000CDs')
                     ->search({}, { bind => [2001] })
                     ->all();
  $count    = $schema->resultset('Year2000CDs')
                     ->search({}, { bind => [2001] })
                     ->count();

SQL EXAMPLES

is_virtual set to false
      $schema->resultset('Year2000CDs')->all();

      SELECT cdid, artist, title FROM year2000cds me

is_virtual set to true
      $schema->resultset('Year2000CDs')->all();

      SELECT cdid, artist, title FROM
        (SELECT cdid, artist, title FROM cd WHERE year ='2000') me

METHODS

  is_virtual
  __PACKAGE__->result_source_instance->is_virtual(1);

Set to true for a virtual view, false or unset for a real database-based view.

  view_definition
  __PACKAGE__->result_source_instance->view_definition(
      "SELECT cdid, artist, title FROM cd WHERE year ='2000'"
      );

An SQL query for your view. Will not be translated across database syntaxes.

  deploy_depends_on
  __PACKAGE__->result_source_instance->deploy_depends_on(
      ["MyApp::Schema::Result::Year","MyApp::Schema::Result::CD"]
      );

Specify the views (and only the views) that this view depends on. Pass this an array reference of fully qualified result classes.

OVERRIDDEN METHODS

  from
Returns the FROM entry for the table (i.e. the view name) or the SQL as a subselect if this is a virtual view.

OTHER METHODS

  new
The constructor.

AUTHORS
See "CONTRIBUTORS" in DBIx::Class.

LICENSE
You may distribute this code under the same terms as Perl itself.