Re: More on cursors in 7.3

"Jeroen T. Vermeulen" <jtv(at)xs4all(dot)nl> writes:
> Looking at my problem with changed cursor behaviour in 7.3 again, I
> noticed something interesting: a cursor in 7.3 apparently does not let
> you scroll back to its first row at all!

Oh?

regression=# begin;
BEGIN
regression=# declare c cursor for select * from int8_tbl;
DECLARE CURSOR
regression=# fetch all from c;
q1 | q2
------------------+-------------------
123 | 456
123 | 4567890123456789
4567890123456789 | 123
4567890123456789 | 4567890123456789
4567890123456789 | -4567890123456789
(5 rows)

regression=# move backward all in c;
MOVE 5
regression=# fetch all from c;
q1 | q2
------------------+-------------------
123 | 456
123 | 4567890123456789
4567890123456789 | 123
4567890123456789 | 4567890123456789
4567890123456789 | -4567890123456789
(5 rows)

regression=#

I believe it is true though that backing up a cursor only works for
certain plan types (seqscan, indexscan, sort, maybe a couple others).
That has always been true --- 7.3 is no better nor worse than prior
releases.

regards, tom lane