SQL query with object function

Question

I want to write a function, which returns more than one value and to include those values into a SQL statement. For example I want to query the RDB with....
select t.id, my_function(t.id).value1 name, my_function(t.id).value2 address ....
from table_x t
where t.id between 1 and 10
and bitand(my_function(t,id)).sec_id,2)>3
Is it possible to do something like this?
I tried to use object and table of objects(my_type) to return value of my_type but when I used
select ......my_function(t.id).name,my_function(t.id).address ...
from table_x
where t.id=some_value;
the function was called twice(i expected this result, but i don't know how to avoid it).
Simple example
CREATE OR REPLACE TYPE l_test AS OBJECT
id NUMBER(10),
name varchar2(100),
a_date date
CREATE OR REPLACE FUNCTION test_f2(test_number IN NUMBER)
RETURN l_test
IS
a number;
BEGIN
select t_seq.nextval into a from dual;
return l_test(a,'test value ='||test_number,sysdate+test_number);
END;
select test_f2(i.id).id client_id, test_f2(i.id).name client_name from r_owners i
CLIENT_ID CLIENT_NAME
1 test value =1
3 test value =2
I want to be able to loop in cursor and use those values
All ideas are welcome!
Thanks,
Iassen Houbenov

Answer 1

Check it out...
SQL> CREATE OR REPLACE TYPE emp_add AS OBJECT
  2  (  office VARCHAR2(50),
  3     location VARCHAR2(50),
  4      MEMBER FUNCTION get_office RETURN VARCHAR2,
  5      MEMBER FUNCTION get_location RETURN VARCHAR2,
  6      CONSTRUCTOR FUNCTION emp_add(id NUMBER) RETURN SELF AS RESULT,
  7      CONSTRUCTOR FUNCTION emp_add(id NUMBER, office VARCHAR2,location VARCHAR2) RETURN
  8        SELF AS RESULT
  9  ) NOT FINAL;
10  /
Type created.
SQL> CREATE OR REPLACE TYPE BODY emp_add IS
  2      MEMBER FUNCTION get_office RETURN VARCHAR2
  3      IS
  4      BEGIN
  5          RETURN SELF.office;
  6      END;
  7      MEMBER FUNCTION get_location RETURN VARCHAR2
  8      IS
  9      BEGIN
10          RETURN SELF.location;
11      END;
12      CONSTRUCTOR FUNCTION emp_add(id NUMBER)
13          RETURN SELF AS RESULT
14      IS
15      BEGIN
16         SELECT dname, loc
17         INTO   SELF.office, SELF.location
18         FROM   dept
19         WHERE  deptno = id;
20         RETURN;
21      END;
22      CONSTRUCTOR FUNCTION emp_add(id NUMBER, office VARCHAR2,location VARCHAR2)
23          RETURN SELF AS RESULT
24      IS
25      BEGIN
26         SELF.office := office;
27         SELF.location := location;
28         RETURN;
29      END;
30  END;
31  /
Type body created.
SQL> SELECT e.ename, e.d.office, e.d.location 
  2  FROM   ( SELECT ename
  3                 , (SELECT emp_add(emp.deptno) FROM dual ) d
  4           FROM   emp ) e
  5  /
ENAME      D.OFFICE
D.LOCATION
SMITH      RESEARCH
DALLAS
ALLEN      SALES
CHICAGO
WARD       SALES
CHICAGO
....Smoke me a kipper I'll be back before breakfast.
Cheers, APC