Re: difficulty extracting variable-sized field on triggered row

On Tue, Dec 04, 2007 at 09:10:21AM -0600, Pavel Stehule wrote:
> use macro DatumGetPointer(datum)

When I do that, I get the following compiler warning:

warning: assignment from incompatible pointer type

which is what originally motivated me to look for another means, which
led me to use PG_DETOAST_DATUM.

Using DatumGetPointer also seg faults ...

Is there somewhere that I am not adequately checking for an error?

Thanks,
Glen

TriggerData *trigdata;
Datum relative_filename_datum;
text *relative_filename_t;
int file_name_colnumber, ret;
bool *isnull;

if( CALLED_AS_TRIGGER( fcinfo ) ) {
elog(INFO, "unlink_file was called as a trigger." );
trigdata = (TriggerData *) fcinfo->context;

if( ( ret = SPI_connect() ) != SPI_OK_CONNECT ) {
elog(INFO, "SPI_connect returned %d", ret);
}

file_name_colnumber = SPI_fnumber( trigdata->tg_relation->rd_att, "file_name" );

if( file_name_colnumber == SPI_ERROR_NOATTRIBUTE ) {
elog(INFO, "SPI_fnumber returned SPI_ERROR_NOATTRIBUTE" );
}

SPI_getbinval( trigdata->tg_trigtuple, trigdata->tg_relation->rd_att, file_name_colnumber, isnull );

if( SPI_result == SPI_ERROR_NOATTRIBUTE ) {
elog(INFO, "SPI_fnumber returned SPI_ERROR_NOATTRIBUTE" );
}

relative_filename_t = PG_DETOAST_DATUM( relative_filename_datum );

if( ( ret = SPI_finish() ) != SPI_OK_FINISH ) {
elog(INFO, "SPI_finish returned %d", ret);
}

}