NAME

Class::DBI::ColumnGrouper - Columns and Column Groups

SYNOPSIS

        my $colg = Class::DBI::ColumnGrouper->new;
           $colg->add_group(People => qw/star director producer/);

        my @cols = $colg->group_cols($group);
        my @groups = $colg->groups_for($column);

        my @all = $colg->all_columns;
        my $pri_col = $colg->primary;

        if ($colg->column_exists($column_name)) { ... }

DESCRIPTION

Each Class::DBI class maintains a list of its columns as class data. This provides an interface to that. You probably don't want to be dealing with this directly.

METHODS

new

        my $colg = Class::DBI::ColumnGrouper->new;

A new blank ColumnnGrouper object.

add_group

        $colg->add_group(People => qw/star director producer/);

This adds a list of columns as a column group.

group_cols

        my @colg = $cols->group_cols($group);

This returns a list of all columns which are in the given group.

groups_for

        my @groups = $colg->groups_for($column);

This returns a list of all groups of which the given column is a member.

all_columns

        my @all = $colg->all_columns;

This returns a list of all columns.

primary

        my $pri_col = $colg->primary;

This returns the name of the primary key column.

essential

        my @essential_cols = $colg->essential;

This returns a list of the columns in the Essential group.

column_exists

        if ($colg->column_exists($column_name)) { ... }