[GENERAL] Question programming in C, PGresult *

Hi.

I have a question regarding programming in C and postgreSQL.

Is there any way that I can save few results to one PGresult * ??

Like this
------------------------
BEGIN;
DECLARE portal1 CURSOR FOR select * from item where item = 'aa';
DECLARE portal2 CURSOR FOR select * from item where item = 'bb';
DECLARE portal3 CURSOR FOR select * from item where item = 'cc';

res = PQexec(conn,"FETCH ALL in portal*"); // Like this
END;
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I really need this function.
I'm a C programmer but not a expert.
If anyone know how to do this in C...
Please let me know..

Thanks in advence.