Re: updateable cursors & visibility

> -----Original Message-----
> From: Bruce Momjian [mailto:pgman(at)candle(dot)pha(dot)pa(dot)us]
>
> Hiroshi Inoue wrote:
> > > > I don't understand what you two are discussing.
> > > > What's is SENSITIVE, INSENSITIVE or ASESNSITIVE ?
> > >
> > > In SQL99 standard, I see:
> > >
> > > - If the cursor is insensitive, then significant
> changes are not
> > > visible.
> > >
> > > - If the cursor is sensitive, then significant changes are
> > > visible.
> > >
> > > - If the cursor is asensitive, then the visibility
> of significant
> > > changes is implementation-dependent.
> >
> > While a cursor is open, another application inserted a
> > row which satisfies the condition to be contained in
> > the cursor and committed. Then
> > If the cursor is SENSITIVE, must it see the row ?
>
> Right.
>
> > If the cursor is INSENSITIVE, it mustn't see the row ?
>
> Right.

If so, isn't the difference between SENSITIVE and INSENSITIVE extreme ?
Why do you or Peter refer to ASENSITIVE little ?
And what does the following mean ? It is placed just before the sentences
you quoted first.

If a cursor is open, and the SQL-transaction in which the cursor was
opened makes a significant change to SQL-data, then whether that
change is visible through that cursor before it is closed is determined
as follows:

regards,
Hiroshi Inoue