@var{result} is a PGresult object.
@example
@comment This example was written on day 3 of the 2000 Haru Basho.
-(pq-exec P "INSERT INTO xemacs_test
- VALUES (6, 'Wakanohana', 'Yokozuna');")
+(setq R (pq-exec P "INSERT INTO xemacs_test
+ VALUES (6, 'Wakanohana', 'Yokozuna');"))
@result{} #<PGresult PGRES_COMMAND_OK[1] - INSERT 542086 1>
(pq-cmd-status R)
@result{} "INSERT 542086 1"
Retrieve an asynchronous result from a query.
@var{conn} A database connection object.
-NIL is returned when no more query work remains.
+@code{nil} is returned when no more query work remains.
@end defun
@defun pq-set-nonblocking conn arg