[GENERAL] detecting NULL column in SPI function

[Louis-David Mitterrand]

Hello,

In a SPI function I have this code snippet:

        double startprice = *DatumGetFloat64(SPI_getbinval(
                                        auction_tt->vals[i], auction_tt->tupdesc,
                                        SPI_fnumber(auction_tt->tupdesc, 
"startprice"), &isnull));

To extract a value from the startprice column. It only works if
"startprice" is not NULL, otherwise the backend crashes.

In the provided example SPI functions I couldn't determine a good way of
testing for NULL on columns. Should I first try to return the Datum,
test it for NULL, then run DatumGetFloat64() on it? Isn't there a
simpler way?

Thanks in advance for your help, cheers,

-- 
Louis-David Mitterrand - [EMAIL PROTECTED] - http://www.apartia.org

 Hand, n.:
         A singular instrument worn at the end of a human arm and
         commonly thrust into somebody's pocket.
                         -- Ambrose Bierce, "The Devil's Dictionary"