Re: libpq simple SELECT - Mailing list pgsql-general

From Igor Korot
Subject Re: libpq simple SELECT
Date
Msg-id CA+FnnTzWJtJwUjWBbm9naV9BUWdzTnQ8dKCtPOqaL0+1UOWcAQ@mail.gmail.com
Whole thread Raw
In response to Re: libpq simple SELECT  (Laurenz Albe <laurenz.albe@cybertec.at>)
Responses Re: libpq simple SELECT
List pgsql-general
Lauren’s,,

On Tue, Dec 16, 2025 at 11:34 PM Laurenz Albe <laurenz.albe@cybertec.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

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