int dbfn_delete(open_db *, const uschar *);
open_db *dbfn_open(uschar *, int, open_db *, BOOL, BOOL);
void *dbfn_read_with_length(open_db *, const uschar *, int *);
int dbfn_delete(open_db *, const uschar *);
open_db *dbfn_open(uschar *, int, open_db *, BOOL, BOOL);
void *dbfn_read_with_length(open_db *, const uschar *, int *);