Q: postgres access in Windows

I spent a couple of hour this weekend trying to get Ruby to talk to
PostgreSQL on a Windows Vista machine without success. I am working
with both Cygwin Ruby and JRuby.

I installed the DBI gem, including dbd_pg. I get the following error
in both version of Ruby:

Could not load driver (no such file to load -- /usr/lib/ruby/


I also tried jruby-postgres and pgconn but I could not figure out how
to call the first one and got errors with the second. I could not
find any documentation (even tried ri).

I tried Googling everything I could think of.

Has anyone gotten a DB connection to PostgreSQL working under Windows
with any version of Ruby?


On Mon, Jul 28, 2008 at 2:14 PM, G. Ralph Kuntz, MD, MS [email protected]

I also tried jruby-postgres and pgconn but I could not figure out how


My current use of postgres is done like this (but I think you can
require ‘dbi’ instead of ‘rubygems’):

require ‘rubygems’
require ‘postgres’

$conn =

If you’ve installed rails you can also do the following in order to
use ActiveRecord which is nice:

require ‘rubygems’
require ‘active_record’

ActiveRecord::Base.pluralize_table_names = false
:adapter => “postgresql”,
:host => “hostname”,
:database => “db-name”,
:username => “username”,
:password => “password”

And then create objects of tables or views.
Assuming you have a table or a view called gen_table:

class GenTable < ActiveRecord::Base; end
gt = GenTable.find(:all)

for a in gt
puts a.id

That worked like a charm!

Is there any documentation on PGconn and the other classes in the
postgres-pr module?


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