Re: libpq simple SELECT

Lauren’s,,

On Tue, Dec 16, 2025 at 11:34 PM Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>
wrote:

> On Tue, 2025-12-16 at 21:49 -0800, Igor Korot wrote:
> > I just tried the following code:
> >
> > [code]
> > std::wstring query1 = L"SELECT t.table_catalog AS catalog,
> > t.table_schema AS schema, t.table_name AS table, u.usename AS owner,
> > c.oid AS table_id FROM information_schema.tables t,
> > pg_catalog.pg_class c, pg_catalog.pg_user u WHERE t.table_name =
> > c.relname AND c.relowner = usesysid AND (t.table_type = 'BASE TABLE'
> > OR t.table_type = 'VIEW' OR t.table_type = 'LOCAL TEMPORARY') ORDER BY
> > table_name;";
> > res = PQexec( m_db, m_pimpl->m_myconv.to_bytes( query1.c_str()
> > ).c_str() );
> > for( int i = 0; i < PQntuples( res ); i++ )
> > {
> > some code handling the results
> > }
> > [/code]
> >
> > The loop is executed exactly 1 time.
> >
> > My question is - according to the comment above I don't have to use
> cursor,
> > but it looks like it's unavoidable?
>
> I see no cursor in your example...

That is my question.

The code shows cursor but the comment indicate that the cursor is not
required.

So do I have to use it? And if not - how to get the results?

Thank you.

>
> Yours,
> Laurenz Albe
>