use hamsterdb! (Score 1)

use hamsterdb! it's a file-based database for C with wrappers for C++, Python, Java and .NET.

it supports database cursors, multiple databases per file, can run as in-memory database, and the next release will support logging/recovery.

license is GPL 2 or later.

oh, and i'm the author ;)

http://hamsterdb.com/
http://freshmeat.net/projects/hamsterdb/