The gnustep-db supports a pluggable database backend mechanism.
The OGo source distribution comes with database adaptors for
<a href="http://www.postgresql.org/" target="extlink">PostgreSQL</a>
and
<a href="http://www.frontbase.com/" target="extlink">FrontBase</a>,
Sybase and Oracle adaptors are part of the 
<a href="http://www.skyrix.com/">SKYRiX 5</a> distribution
and not part of the OGo source tree.
<br />
OGo is open for the contribution of additional database backend
adaptors, but having support for a perfectly suitable OpenSource database,
PostgreSQL, we see no immediate need to extend OGo for MySQL or other
database on our own.
<br />
Does it work with JDBC: no, OGo is not a Java application.
Does it work with ODBC (eg unixODBC): no, not currently, though it might be
viable to write a generic ODBC adaptor for OGo.