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The jdbc connector can, in theory, work with any JDBC driver that has been
added into the list it knows about.  The code as granted knows about the following:

Mssql/Sybase (via open-source jtds)
Postgresql (via an appropriate open-source postgresql JDBC driver)
Oracle (via a proprietary, but freely downloadable Oracle JDBC driver)

The connector was tested against the following versions of the above:

Oracle: oracle jdbc4 jdk1.4 version 10.1.0-2.0
Jtds: version 1.2.2, downloadable from SourceForge
Postgresql: the debian postgresql driver package for postgresql 8.3.7, aka libpg-java, version 8.2-504-2.

None of these required custom changes.

To build this connector with Oracle support, copy the Oracle JDBC
driver into this directory before building.  To build with Mssql/Sybase,
copy a version of the jtds driver into this directory.  Then, build the
connector using the normal ant build script.  Further information can be
found on the "how-to-build-and-deploy.html" documentation page.