Обсуждение: Cursors and move

Hi All!

First of all, I'm not sure if it is on-topic here. If not, show a correct
place to me, please.

I've got some problems with cursors and move command.
I write a program using libpq and I have something like this:

BEGIN
DECLARE cur CURSOR FOR SELECT num FROM zlec
FETCH FORWARD 2 IN cur
MOVE BACKWARD ALL IN cur
FETCH FORWARD 2 IN cur

In the last FETCH command PQresultStatus(res) returns PGRES_TUPLES_OK, but
PQntuples(res) returns 0.
Is it a correct behaviour of the move command? Or I missed something?

-- 
Na razie    |  Zapraszam na:  http://www.polsl.gliwice.pl/~kalma   Marcin  |

Marcin Kadziolka wrote:
> 
> Hi All!
> 
> First of all, I'm not sure if it is on-topic here. If not, show a correct
> place to me, please.
> 
> I've got some problems with cursors and move command.
> I write a program using libpq and I have something like this:
> 
> BEGIN
> DECLARE cur CURSOR FOR SELECT num FROM zlec
> FETCH FORWARD 2 IN cur
> MOVE BACKWARD ALL IN cur
> FETCH FORWARD 2 IN cur
> 
> In the last FETCH command PQresultStatus(res) returns PGRES_TUPLES_OK, but
> PQntuples(res) returns 0.
> Is it a correct behaviour of the move command? Or I missed something?
> 

The cursors have never really worked right.  Especially the move seems
wrong, once you go off the edge, you're screwed.  

Dave Hartwig was close to a fix for this at one point, but he gave up.

Byron