mergeant can be considered as an extension of the libgda project.

Its aims are the same: to provide universal data source access for
client applications, as well as development tools and libraries
for doing so. mergeant; is an extension to libgda; because it adds
support to the architecture for the GNOME project.  mergeant was formed
by merging components from gnome-db and gASQL.

WWW: http://www.gnome-db.org/