libpq questuion

While update table whithin fetch forward loop
cause infinite fetching of updated touple?

(code fragment below cause infinite
displayng record with oid 20864)

----------------------------------------------------------------------------
PQexec(_conn, "BEGIN");
PQexec(_conn, "DECLARE curr1 CURSOR FOR select oid, name from domains;");

while(1)
{
_res = PQexec(_conn, "FETCH FORWARD 1 IN curr1");
if( PQresultStatus(_res) != PGRES_TUPLES_OK ) break;

PQexec(_conn, "update domains set type = 3 where oid = 20864" );
printf("oid: %s name: %s\n", PQgetvalue(_res,0,0),PQgetvalue(_res,0,1));
}
---------------------------------------------------------------------------

--
Dmitry Samersoff
DM\S, dms(at)wplus(dot)net, AIM: Samersoff
http://devnull.wplus.net