void PostgreSQLConnection::GetColumn(int i, Ref f) const
{
	if(PQgetisnull(result, fetched_row, i))
	{
		f = Null;
		return;
	}
	char *s = PQgetvalue(result, fetched_row, i);
	switch(info[i].type)
	{
		case INT64_V:
			f.SetValue(ScanInt64(s));
			break;
		case INT_V:
			f.SetValue(atoi(s));
			break;
		case DOUBLE_V:
			f.SetValue(atof(s));
			break;