Asp Forum - Sequel 0.0.9 - Concise ORM for Ruby

Sharon Rosner

3/26/2007 8:49:00 AM

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.rub...
The source code is here: http://ruby-sequel.googlecode.com...

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!

comp.lang.ruby

Sequel 0.0.9 - Concise ORM for Ruby

Sharon Rosner

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