On Thu, Jan 7, 2010 at 1:44 AM, Yan Cheng Cheok <yccheok@xxxxxxxxx> wrote:
> Sorry if this question had been asked before. Although I had googled, but find no answer.
>
> I try to use C++, to iterate the array returned from stored procedure.
>
> std::stringstream ss;
> ss << "SELECT * FROM get_array_test()";
> res = PQexec(conn, ss.str().c_str());
>
> int nrows = PQntuples(res);
> int nfields = PQnfields(res);
> printf("number of rows returned = %d\n", nrows);
> printf("number of fields returned = %d\n", nfields);
>
> for (int r = 0; r < nrows; r++) {
> for (int n = 0; n < nfields; n++)
> printf(" %s = %s(%d),",
> PQfname(res, n),
> PQgetvalue(res, r, n),
> PQgetlength(res, r, n));
> printf("\n");
> }
>
> Here is my result :
>
> number of rows returned = 1
> number of fields returned = 1
> get_array_test = {100,200,300}(13),
>
> Here is my stored procedure :
>
> CREATE OR REPLACE FUNCTION get_array_test()
> RETURNS integer[] AS
> DECLARE
> i int4[];
> BEGIN
> i[1] = 100;
> i[2] = 200;
> i[3] = 300;
> return i;
> END;
>
> Is there any way, I can obtain the stored procedure result in c/c++ int array, instead of 1 line of char*?
not exactly. however you do have the libpqtypes library which extends
libpq to deal with arrays:
http://libpqtypes.esilo.com/
note, libpqtypes requires postgres 8.4 (or 8.3 with patched libpq).
PGarray arr;
int ntups;
res = PQexecf(conn, "SELECT * FROM get_array_test()");
PQgetf(res, 0, "%int4[]", 0, &arr);
ntups = PQntuples(arr.res);
for(i=0; i<ntups; i++)
{
PGint4 val;
PQgetf(arr.res, i, "%int4", 0, &val);
printf("val=%d\n", val);
}
PQclear(res);
PQclear(arr.res);
merlin
--
Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-general
