irb(main):001:0> require 'sequel'
=> true
irb(main):002:0> y = Sequel.connect 'jdbc:postgresql://jblog?user=waves'
=> #<Sequel::JDBC::Database: "jdbc:/">
irb(main):003:0> y.create_table :plzs do
irb(main):007:1* column :rght, :text
irb(main):008:1> end
Sequel::Error: No connection string specified
        from /usr/share/jruby-1.1.2/lib/ruby/gems/1.8/gems/sequel_core-2.2.0/lib/sequel_core/adapters/jdbc.rb:18:in `connect'
        from /usr/share/jruby-1.1.2/lib/ruby/gems/1.8/gems/sequel_core-2.2.0/lib/sequel_core/database.rb:55:in `initialize'
        from /usr/share/jruby-1.1.2/lib/ruby/gems/1.8/gems/sequel_core-2.2.0/lib/sequel_core/connection_pool.rb:138:in `call'
        from /usr/share/jruby-1.1.2/lib/ruby/gems/1.8/gems/sequel_core-2.2.0/lib/sequel_core/connection_pool.rb:138:in `make_new'
        from /usr/share/jruby-1.1.2/lib/ruby/gems/1.8/gems/sequel_core-2.2.0/lib/sequel_core/connection_pool.rb:130:in `available'
        from /usr/share/jruby-1.1.2/lib/ruby/gems/1.8/gems/sequel_core-2.2.0/lib/sequel_core/connection_pool.rb:121:in `acquire'
        from /usr/share/jruby-1.1.2/lib/ruby/gems/1.8/gems/sequel_core-2.2.0/lib/sequel_core/connection_pool.rb:120:in `acquire'
        from /usr/share/jruby-1.1.2/lib/ruby/gems/1.8/gems/sequel_core-2.2.0/lib/sequel_core/connection_pool.rb:85:in `hold'
        from /usr/share/jruby-1.1.2/lib/ruby/gems/1.8/gems/sequel_core-2.2.0/lib/sequel_core/adapters/jdbc.rb:54:in `execute'
        from /usr/share/jruby-1.1.2/lib/ruby/gems/1.8/gems/sequel_core-2.2.0/lib/sequel_core/database/schema.rb:59:in `create_table'
        from /usr/share/jruby-1.1.2/lib/ruby/gems/1.8/gems/sequel_core-2.2.0/lib/sequel_core/database/schema.rb:59:in `each'
        from /usr/share/jruby-1.1.2/lib/ruby/gems/1.8/gems/sequel_core-2.2.0/lib/sequel_core/database/schema.rb:59:in `create_table'
        from (irb):7:in `binding'