object
method commit : unit -> unit Uq_engines.engine
method connection : Pfs_db.rw_async_connection
method event_system : Unixqueue.event_system
method prepare : unit -> unit Uq_engines.engine
method return : unit -> unit
method ro_connection : Pfs_db.ro_async_connection
method rollback : unit -> unit Uq_engines.engine
end
