cl-fbclient
cl-fbclient is an interface to Firebird SQL databases.

Source: https://github.com/klimenko-serj/cl-fbclient

Wiki: http://github.com/klimenko-serj/cl-fbclient/wiki

Example:

(require 'cl-fbclient)

(cl-fbclient:fb-with-database (DB :path "/path-to-db/db-file.fdb")
     (cl-fbclient:fb-query "SELECT * FROM T1" :db DB)
     (cl-fbclient:fb-query "INSERT INTO T1(A1,A2) VALUES(121, 42)" :db DB)
     (cl-fbclient:fb-query "SELECT * FROM T1" :db DB))