From: | Jeroen Vermeulen <jtv(at)xs4all(dot)nl> |
---|---|
To: | Georges(dot)Brefort(at)sanofi-aventis(dot)com |
Cc: | pgsql-interfaces(at)postgresql(dot)org |
Subject: | Re: Retrieving points, arrays, ... with libpq |
Date: | 2008-10-22 05:27:28 |
Message-ID: | 48FEB9C0.7030608@xs4all.nl |
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Lists: | pgsql-interfaces |
Georges(dot)Brefort(at)sanofi-aventis(dot)com wrote:
> I have read the most recent documentation from the first to the very
> last line, and I guess I can retreive data of any type with the
> PQgetValue() function, something like:
>
> char* chunkOfMemory = PQgetvalue( (const PGresult*) myresult,
> row_number, column_number);
>
> But then, is it possible to cast the char* pointer to some meaningfull C
> structure if column_number relates to some datatype other than text or
> integer ?
By default, you get your data in a textual representation. So you need
to parse the string that that char* points to. (It's also possible to
work in binary mode, but then you've got a lot more worries about
portability and such for not much gain in speed.)
Jeroen
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