Re: forming tuple as an attribute inside another tuple in c function
| От | Marios Vodas |
|---|---|
| Тема | Re: forming tuple as an attribute inside another tuple in c function |
| Дата | |
| Msg-id | AANLkTikvmn4_oD0gFCQD8tU4N1b9KmX7jvCQnr5a2Xj+@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: forming tuple as an attribute inside another tuple in c function (Tom Lane <tgl@sss.pgh.pa.us>) |
| Ответы |
Re: forming tuple as an attribute inside another tuple in c function
|
| Список | pgsql-hackers |
OK but what is the recommended way to get TupleDesc for p_type? I am aware of RelationNameGetTupleDesc but I shouldn't use it since it is deprecated.
float8 xi = 1;
float8 yi = 2;
float8 xe = 3;
float8 ye = 4;
bool isnull;
TupleDesc tupdesc;
Datum values[3];
HeapTuple tuple;
if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE) {
ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("function returning record called in context that cannot accept type record")));
}
BlessTupleDesc(tupdesc);
values[0] = HeapTupleGetDatum(i);
However by using it the code would look something like this (I tested it and it works as expected):
Datum demo(PG_FUNCTION_ARGS) {
float8 yi = 2;
float8 xe = 3;
float8 ye = 4;
int32 id = 1;
TupleDesc tupdesc;
TupleDesc tupdesc_p;
Datum values[3];
Datum vi[2];
Datum ve[2];
HeapTuple tuple;
HeapTuple i;
HeapTuple e;
tupdesc_p = RelationNameGetTupleDesc("p_type");
vi[0] = Float8GetDatum(xi);
vi[1] = Float8GetDatum(yi);
i = heap_form_tuple(tupdesc_p, vi, &isnull);
ve[0] = Float8GetDatum(xe);
ve[1] = Float8GetDatum(ye);
e = heap_form_tuple(tupdesc_p, ve, &isnull);
if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE) {
ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("function returning record called in context that cannot accept type record")));
}
BlessTupleDesc(tupdesc);
values[0] = HeapTupleGetDatum(i);
values[1] = HeapTupleGetDatum(e);
values[2] = Int32GetDatum(id);
tuple = heap_form_tuple(tupdesc, values, &isnull);
}
values[2] = Int32GetDatum(id);
tuple = heap_form_tuple(tupdesc, values, &isnull);
PG_RETURN_DATUM(HeapTupleGetDatum(tuple));
On Mon, Sep 27, 2010 at 3:32 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
You've omitted to tell us justwhat's going wrong for you.
regards, tom lane
В списке pgsql-hackers по дате отправления: