假设数据库存在以下函数：

-- Function: for_test(integer,integer)

--DROP FUNCTION for_test(integer,integer);

CREATE OR REPLACE FUNCTION for_test(INOUT param1 integer,INOUT param2 integer)
  RETURNS record AS
$BODY$
begin
select id,def_skill_id into param1,param2 from gangs where id = param1;
end
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;
ALTER FUNCTION for_test(integer,integer) OWNER TO postgres;

c++调用：

        Mordor::PQ::Result rt1 = conn->execute("SELECT * from for_test(1,2)");
        int a = (int)rt1.getType((size_t)0);
        int id = rt1.get<int>((size_t)0,(size_t)0);
        std::cerr << a << "   " << id << std::endl;

SELECT * from for_test(1,2)

而不是

SELECT for_test(1,2)

后者返回的是一个OID为2249的复合类型。

文献参考：

http://postgresql.1045698.n5.nabble.com/getting-composite-types-info-from-libpq-td3306738.html