I've put some notes about prepared queries on github: https://github.com/FreeRADIUS/freeradius-server/issues/830 In short, it seems to be relatively simple. There's some magic in turning: SELECT ... %{User-Name} ... into PREPARE fooplan (int, text, bool, numeric) AS SELECT foo VALUES($1, $2, $3, $4); followed by: EXECUTE fooplan(1, 'Hunter Valley', 't', 200.00); But it doesn't seem impossible. Alan DeKok.