Thank you Christian!
I've not tried, but you should be able to use Oracle through my "gperl" Perl interface and the Perl DBI Oracle driver. gperl is bundled with http://scheme.mine.nu/gambit/chjmodule/ . There's a readme file which should help getting it to run (*). You should be able to use the gperl code by just including it and it's dependencies instead of using chjmodule if you don't want to use the latter. Just ask if you have questions or problems.