Rails - Aug 2009 - DBI: connect succeeds in IRB, fails in Rails

require ''dbi'' # 0.4.2
dbh = DBI.connect(''DBI:ODBC:PACS'',
''username'', ''password'')

This works in IRB; in Rails it fails (taken from Rails console):
DBI::InterfaceError: Unable to load driver ''ODBC'' (underlying
error:
uninitialized constant DBI::DBD::ODBC)
        from C:/scripts/Rads/vendor/gems/dbi-0.4.2/lib/dbi.rb:300:in
`load_driver''
        from c:/ruby/lib/ruby/1.8/monitor.rb:242:in `synchronize''
        from C:/scripts/Rads/vendor/gems/dbi-0.4.2/lib/dbi.rb:242:in
`load_driver''
        from C:/scripts/Rads/vendor/gems/dbi-0.4.2/lib/dbi.rb:160:in
`_get_full_driver''
        from C:/scripts/Rads/vendor/gems/dbi-0.4.2/lib/dbi.rb:145:in
`connect''
        from (irb):2

I haven''t found anything online that was a substantial help :/
-- 
Posted via http://www.ruby-forum.com/.

Oh -- Ruby 1.8.7, and I can connect by writing a small script and 
launching it with Ruby (same version of Ruby that Rails uses).
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Posted via http://www.ruby-forum.com/.

gem install dbd-odbc

(who knows why it worked without me doing that beforehand; maybe some 
gem update and it forgot that this existed, or overwrote files... ?)

And a reinstallation of ruby-odbc :
http://www.ch-werner.de/rubyodbc/
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