Oracle8i Object-Relational Features Problem(How to manipulate value by Member Method)

Question

sorry ~ I've never use 8iLite before, but I really want to figure out this !
How can I create a Object Table , define Member Functions to change it's self
attribute value ~
for example :
CREATE OR REPLACE TYPE HumanType AUTHID CURRENT_USER AS OBJECT (
id NUMBER(3,0),
name VARCHAR(4),
age NUMBER(3,0),
MEMBER FUNCTION getName RETURN VARCHAR2,
MEMBER Procedure ageChange(c_age IN NUMBER)
CREATE OR REPLACE TYPE BODY HumanType AS
MEMBER FUNCTION getName RETURN VARCHAR2 IS
BEGIN
RETURN (SELF.name);
END;
MEMBER PROCEDURE ageChange(c_age IN NUMBER) IS
age NUMBER;
BEGIN
age:=age+c_age;
END;
END;
CREATE TABLE MAN OF HumanType;
There is one record in MAN table.
ID NAME AGE
1 VIC 21
in SQLplus I command
SQL> SELECT m.agechange(5) FROM MAN m WHERE ID=1;
THE ERROR MESSAGE IS :
ERROR AT LINE1;
ORA-06553: PLS-222: no function with name 'AGECHANGE' exists in this scope
Q1.WHY CAN'T I USE the Member Method to Change the Value of itself ?
Q2.Is there any other site can discuss Oracle Object-Relational Feature ?
Thank you very much!

Answer 1

hi,
u r trying to return values but u r using procedure. that's first mistake
then u declared variable called age in proc. from where does the age value comes. do u assume it will take column value. if so its wrong.
start trying with simple examples
ex: CREATE OR REPLACE TYPE HumanType AS OBJECT (
id NUMBER(3,0),
name VARCHAR(4),
age NUMBER(3,0),
MEMBER FUNCTION ageChange(c_age IN NUMBER) RETURN NUMBER
CREATE OR REPLACE TYPE BODY HumanType AS
MEMBER FUNCTION ageChange(c_age IN NUMBER) RETURN NUMBER IS
age NUMBER;
BEGIN
age:=age+c_age;
RETURN AGE;
END;
END;
now try with ur sql stt
since there is no value for variable age it will be treated as null and the result will be : null. it won't give error
try this.
if u have oracle 8 complete reference book refer pages 628 to 630.
ie. Methods, creating metods.