Are there any Ruby ORMs which use cursors or smart fetch?

Question

I\'m looking for a Ruby ORM to replace ActiveRecord. I\'ve been looking at Sequel and DataMapper. They look pretty good however none of them seems to do the basic: not loading e

Answer 1

Sequel.extension :pagination
posts.order(:id).each_page(1000) do |ds|
  ds.each { |p| puts p }
end

It is very very slow on large tables!

It becomes clear, looked at the method body: http://sequel.rubyforge.org/rdoc-plugins/classes/Sequel/Dataset.html#method-i-paginate

# File lib/sequel/extensions/pagination.rb, line 11

def paginate(page_no, page_size, record_count=nil)
  raise(Error, "You cannot paginate a dataset that already has a limit") if @opts[:limit]
  paginated = limit(page_size, (page_no - 1) * page_size)
  paginated.extend(Pagination)
  paginated.set_pagination_info(page_no, page_size, record_count || count)
end