Вячеслав Тихановский > ObjectDB-0.990103 > ObjectDB::Schema

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NAME ^

ObjectDB::Schema - Schema class

SYNOPSIS ^

    package Article;

    use strict;
    use warnings;

    use base 'ObjectDB';

    __PACKAGE__->schema(
        table          => 'article',
        columns        => [qw/id category_id author_id title/],
        primary_keys   => ['id'],
        auto_increment => 'id',

        relationships => {
            author => {
                type  => 'many to one',
                class => 'Author',
                map   => {author_id => 'id'}
            },
            category => {
                type  => 'many to one',
                class => 'Category',
                map   => {category_id => 'id'}
            },
            tags => {
                type      => 'many to many',
                map_class => 'ArticleTagMap',
                map_from  => 'article',
                map_to    => 'tag'
            },
            comments => {
                type  => 'one to many',
                class => 'Comment',
                where => [type => 'article'],
                map   => {id => 'master_id'}
            }
        }
    );

    1;

DESCRIPTION ^

ATTRIBUTES ^

attr

METHODS ^

new

Not called externally, but sets the following attributes:

table

    __PACKAGE__->schema(
        table => 'article
        ...

Table name.

columns

    __PACKAGE__->schema(
        ...
        columns => [qw/id title/]
        ...

Sets columns.

primary_keys

    __PACKAGE__->schema(
        ...
        primary_keys => [qw/id/]
        ...

Sets primary keys. Could be multiple of course.

unique_keys

    __PACKAGE__->schema(
        ...
        unique_keys => [qw/title/]
        ...

Sets unique keys. Could be multiple of course.

auto_increment

    __PACKAGE__->schema(
        ...
        auto_increment => 'id'
        ...

Sets auto increment key. Is altered on object database insertion.

relationships

    __PACKAGE__->schema(
        ...
        relationships => {
            author => {
                type  => 'many to one',
                class => 'Author',
                map   => {author_id => 'id'}
            },
        ...

Sets relationships. For more information see ObjectDB::Relationship.

is_column

    $article->schema->is_column('title'); # true

Returns true when argument is a column. False otherwise.

is_primary_key

    $article->schema->is_primary_key('title'); # false

Returns true when argument is a primary key. False otherwise.

is_auto_increment

    $article->schema->is_auto_increment('id'); # true

Returns true when argument is an auto increment column. False otherwise.

is_unique_key

    $article->schema->is_unique_key('title'); # false

Returns true when argument is a unique key. False otherwise.

columns

    my @columns = $article->schema->columns;

Returns schema columns.

primary_keys

    my @primary_keys = $article->schema->primary_keys;

Returns primary keys.

unique_keys

    my @unique_keys = $article->schema->unique_keys;

Returns unique keys.

add_column

    __PACKAGE__->add_column(content => {default => 'foo'});

Adds column to the schema. Usually used when you extend existing class and want to add few new columns.

add_columns

    __PACKAGE__->add_column(qw/content image/);

Adds columns to the schema. Uses add_column.

add_relationship

    __PACKAGE__->add_relationship(
        comments => {
            type  => 'one to many',
            class => 'Comment',
            where => [type => 'article'],
            map   => {id => 'master_id'}
        }
    );

Adds relationhips to the schema. Usually used when you extend existing class and want to add few new relationhips.

add_relationships

    __PACKAGE__->add_relationships(
        comments => {
            type  => 'one to many',
            class => 'Comment',
            where => [type => 'article'],
            map   => {id => 'master_id'}
        },
        ...
    );

Adds relationhips to the schema. Uses add_relationhip.

del_column

    __PACKAGE__->del_column('content');

Deletes column from the schema. Usually used when you extend existing class and want to delete few old columns.

AUTHOR ^

Viacheslav Tykhanovskyi, vti@cpan.org.

COPYRIGHT ^

Copyright (C) 2009, Viacheslav Tykhanovskyi.

This program is free software, you can redistribute it and/or modify it under the same terms as Perl 5.10.

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