how to connect the gnome aplication(gtk+) to database

[angel kingdom <angelkingdom7 gmail com>]

HI,
i am working on a application(project Gutenberg ) which is written in gtk+
and i want to connect this application with database server to store
dictionary.i am having the Dictionary in xml format.
So,please guide me or give me a link of how to do this work.
I am using ubuntu 9.04
And for database i am using the postgresql..

thank you
Deepa A