postgres has cursors?
Benjamin Scherrey wrote:
> I've been developing a web-based selection browser using cursors and discovered a
> very frustrating little feature as I try to MOVE FORWARD/BACKWARD through my selection. If, for
> a normal select statement (select this, that from table) I have no worries trying to tell my cursor to
> move forwards or backwards any number of positions, even beyond the beginning or end - in which
> case, it just will stay put as one might expect. However, if I pass in a select statement that uses an
> aggregate function (select sum(this), that from table) then as soon as I try to scroll off the end or
> prior to the beginning my cursor is busted and no longer fetchable. I have not tried to find out what
> other functions or options (like grouping) have similar effects yet so the list isn't exhaustive. This is
> all under Postgres 7.3 and 7.3.2 under linux and cygwin respectively.
>
> Is this a known bug? Any ability for me to ask my cursor what its present absolute offset is
> (so I don't ask it to scroll past the end accidently)? Any other workarounds? This is making it quite
> difficult for me to implement my browser cleanly.
>
> thanx & later,
>
> Ben Scherrey
>
>
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