/*
* call-seq:
* res.getisnull(tuple_position, field_position) -> boolean
*
* Returns +true+ if the specified value is +nil+; +false+ otherwise.
*/
static VALUE
pgresult_getisnull(VALUE self, VALUE tup_num, VALUE field_num)
{
PGresult *result;
int i = NUM2INT(tup_num);
int j = NUM2INT(field_num);
result = get_pgresult(self);
if (i < 0 || i >= PQntuples(result)) {
rb_raise(rb_eArgError,"invalid tuple number %d", i);
}
if (j < 0 || j >= PQnfields(result)) {
rb_raise(rb_eArgError,"invalid field number %d", j);
}
return PQgetisnull(result, i, j) ? Qtrue : Qfalse;
}