DBIx::Class::Schema::Loader::DBI::Writing - Loader subclass writing guide for DBI

  package DBIx::Class::Schema::Loader::DBI::Foo;

  # THIS IS JUST A TEMPLATE TO GET YOU STARTED.

  use strict;
  use warnings;
  use base 'DBIx::Class::Schema::Loader::DBI';
  use Carp::Clan qw/^DBIx::Class/;
  use mro 'c3';

  sub _table_uniq_info {
      my ($self, $table) = @_;

      # ... get UNIQUE info for $table somehow
      # and return a data structure that looks like this:

      return [
         [ 'keyname' => [ 'colname' ] ],
         [ 'keyname2' => [ 'col1name', 'col2name' ] ],
         [ 'keyname3' => [ 'colname' ] ],
      ];

      # Where the "keyname"'s are just unique identifiers, such as the
      # name of the unique constraint, or the names of the columns involved
      # concatenated if you wish.
  }

  sub _table_comment {
      my ( $self, $table ) = @_;
      return 'Comment';
  }

  sub _column_comment {
      my ( $self, $table, $column_number ) = @_;
      return 'Col. comment';
  }

  1;

The only required method for new subclasses is _table_uniq_info, as there is not (yet) any standardized, DBD-agnostic way for obtaining this information from DBI.

The base DBI Loader contains generic methods that *should* work for everything else in theory, although in practice some DBDs need to override one or more of the other methods. The other methods one might likely want to override are: _table_pk_info, _table_fk_info, _tables_list and _extra_column_info. See the included DBD drivers for examples of these.

See AUTHOR in DBIx::Class::Schema::Loader and CONTRIBUTORS in DBIx::Class::Schema::Loader.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

To import comments from database you need to implement _table_comment, _column_comment