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module Sequel
# A dataset represents an SQL query, or more generally, an abstract
# set of rows in the database. Datasets
# can be used to create, retrieve, update and delete records.
#
# Query results are always retrieved on demand, so a dataset can be kept
# around and reused indefinitely (datasets never cache results):
#
# my_posts = DB[:posts].filter(:author => 'david') # no records are retrieved
# my_posts.all # records are retrieved
# my_posts.all # records are retrieved again
#
# Most dataset methods return modified copies of the dataset (functional style), so you can
# reuse different datasets to access data:
#
# posts = DB[:posts]
# davids_posts = posts.filter(:author => 'david')
# old_posts = posts.filter('stamp < ?', Date.today - 7)
# davids_old_posts = davids_posts.filter('stamp < ?', Date.today - 7)
#
# Datasets are Enumerable objects, so they can be manipulated using any
# of the Enumerable methods, such as map, inject, etc.
#
# For more information, see the {"Dataset Basics" guide}[link:files/doc/dataset_basics_rdoc.html].
class Dataset
extend Metaprogramming
include Metaprogramming
include Enumerable
include SQL::AliasMethods
include SQL::BooleanMethods
include SQL::CastMethods
include SQL::ComplexExpressionMethods
include SQL::InequalityMethods
include SQL::NumericMethods
include SQL::OrderMethods
include SQL::StringMethods
end
require(%w"query actions features graph prepared_statements misc mutation sql", 'dataset')
end
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