here[1] you can get LMDB[2] bindings. there is no high-level D-style API, only C API translation. i'm not sure if it needs D-style API at all, as most likely you will write your own wrappers for your data types anyway.

[1] http://repo.or.cz/w/iv.d.git/blob_plain/HEAD:/lmdb.d [2] http://symas.com/mdb/