Sequel is a new ORM tool for Ruby. Sequel provides the following
features:
- Thread safety and connection pooling. You can write multi-threaded
applications that connect to databases without worrying about handling
connections. - A concise, chainable query DSL lets you stay close to the metal
without writing SQL. You don’t have to define model classes. - Datasets support filtering, ordering, summarizing, and joining.
- Records are fetched one at a time, so you can work with huge result
sets. - Currently has adapters for Postgresql, SQLite and MySQL (preliminary
support). - Model classes work in similar fashion to ActiveRecord (but are
currently missing some functionality.)
RDoc documentation is here: http://sequel.rubyforge.org
The source code is here: http://ruby-sequel.googlecode.com/svn/trunk
A Short Example:
require ‘sequel/sqlite’
open an in-memory SQLite database
DB = Sequel.open ‘sqlite:/:memory:’
create a table
DB.create_table :items do
primary_key :id, :integer, :auto_increment => true
column :name, :text
column :price, :float
end
popuplate table
100.times {DB[:items] << {:name => “product#{rand(1000)}”, :price =>
rand * 100}}
create a dataset of highest priced products with a price over 70
expensive_stuff = DB[:items].filter(‘price >
70’).reverse_order(:price).limit(10)
puts “There are #{expensive_stuff.count} expensive items.”
puts “Most expensive items (in descending order)”
expensive_stuff.each {|i| puts “#{i[:name]} = #{i[:price]}”}
print average of most expensive products
puts “Average of expensive stuff: #{expensive_stuff.avg(:price)}”
Sequel is in an early stage of development, so some things might be
broken. I appreciate any comments as well as bug reports. Enojy!