NAME

       Rose::DB::Object::Metadata::PrimaryKey - Primary key metadata.

SYNOPSIS

         use Rose::DB::Object::Metadata::PrimaryKey;

         $pk = Rose::DB::Object::Metadata::PrimaryKey->new(
                 columns => [ 'id', 'type' ]);

         MyClass->meta->primary_key($pk);
         ...

DESCRIPTION

       Objects of this class store and manipulate metadata for primary keys in a database table.  Each primary
       key is made up of one or more columns.

OBJECT METHODS

       add_column [COLUMNS]
           This method is an alias for the add_columns method.

       add_columns [COLUMNS]
           Add COLUMNS to the list of columns that make up the primary key.  COLUMNS must be a list or reference
           to an array of  column names or Rose::DB::Object::Metadata::Column-derived objects.

       columns [COLUMNS]
           Get or set the list of columns that make up the primary key.  COLUMNS must a list or reference to an
           array of column names or Rose::DB::Object::Metadata::Column-derived objects.

           This method returns all of the columns that make up the primary key.  Each column is a
           Rose::DB::Object::Metadata::Column-derived column object if the primary key's parent has a column
           object with the same name, or just the column name otherwise.  In scalar context, a reference to an
           array of columns is returned.  In list context, a list is returned.

       column_names
           Returns a list (in list context) or reference to an array (in scalar context) of the names of the
           columns that make up the primary key.

       delete_columns
           Delete the entire list of columns that make up the primary key.

       name [NAME]
           Get or set the name of the primary key.  Traditionally, this is the name of the index that the
           database uses to maintain the primary key, but databases vary.  If left undefined, the default value
           is "primary_key".

       parent [META]
           Get or set the Rose::DB::Object::Metadata-derived object that this primary key belongs to.

       sequence_names [NAMES]
           Get or set the list of database sequence names (if any) used to generate values for the primary key
           columns.  The sequence names must be in the same order as the columns.  NAMES may be a list or
           reference to an array of sequence names.  Returns a list (in list context) or reference to the array
           (in scalar context) of sequence names.

AUTHOR

       John C. Siracusa (siracusa@gmail.com)

LICENSE

       Copyright (c) 2010 by John C. Siracusa.  All rights reserved.  This program is free software; you can
       redistribute it and/or modify it under the same terms as Perl itself.