Re: converting datum to numeric

On 25 June 2013 08:51, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> wrote:

> Hello
>
> 2013/6/25 Szymon Guz <mabewlun(at)gmail(dot)com>:
> > Hi,
> > I've got a couple of questions.
> >
> > I was using numeric_out like this:
> >
> > DatumGetCString(DirectFunctionCall1(numeric_out, d));
> >
> > Why do I have to use DirectFunctionCall1 instead of calling numeric_out?
>
> numeric_out functions doesn't use C calling convention - it use own
> convention for support NULL values and some other informations.
> DirectFunctionCall1 is simple function that transform C like call to
> PostgreSQL call. You can do it directly, but you have to prepare
> necessary structures.
>
> >
> >
> > I was suggested to use numeric_send instead of numeric_out, however when
> > changing the function names in the above example, the whole expression
> > returns 8. Always 8. I check with:
> >
> > char *x = DatumGetCString(DirectFunctionCall1(numeric_send, d));
> > PLy_elog(NOTICE, x).
> >
>
> "send" functions are used for binary protocol - so it is nonsense.
>
>
>
Hi,
thanks for the information. So I will leave speeding it up for this moment.

thanks,
Szymon