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ruby-oci8 is a ruby interface for Oracle Database. This is available with Oracle8, Oracle8i, Oracle9i, Oracle10g, Oracle XE and Oracle Instant Client

ruby-oci8-1.0 is stable version. ruby-oci8-2.0-unstable is in development. Don't use 2.0-unstable for your projects.

As for Oracle7, use Oracle7 Module for Ruby by Yoshida Masato.

connect to scott/tiger, select emp and print as CSV format.

 ruby -r oci8 -e "OCI8.new('scott', 'tiger').exec('select * from emp') do |r| puts r.join(','); end"