Oracle 11g : Object Oriented Programming In Oracle PLSQL

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Before I took the job as the Associate Software Engineer, I was a JAVA and .NET guy.
All the projects that I did before my current job, I did them JAVA or either .NET. In those time object was my play thing. Everything I do in my project I used to think in object way.I know how powerful  object oriented programming is.

Currently I am a oracle plsql developer. And as soon as I get this job I tried to model data in my own way as I used to do in JAVA and .NET. And I was very happy to find out that Oracle too has object oriented features.

Let me show you a quick code demo that uses oracle's object oriented features.
The gist of code is  :

"If I am two numbers then I can be added, subtracted, multiplied and divided."

Now here goes the code:

--this is object type with two number variables. 
--as in java one can define constructor, member functions
--and yes, setters and getters.
--i am not showing all of them coz i am lazy

CREATE OR REPLACE TYPE numbers AS object
(
    a NUMBER,
    b NUMBER
);

Upto this what I did is I created a number Object.
Think something like this :

"If I have a car, I can drive it, and of course I can sell it too." 

So, If I have numbers then I can add them, divided them , subtract them and yes multiply them. Here's the code that does all the above mentioned.

 (See think objectly , everything will look simple and programming would be so easy.)

--This is another object that does all the operation for numbers object.
--This is definition spec.
CREATE OR REPLACE TYPE numbersOp AS object
(
    n numbers, --my numbers object

    --this is how one defines member functions in oracle.
    member FUNCTION plus RETURN NUMBER ,    --add
    member FUNCTION sub RETURN NUMBER,      --subtract 
    member FUNCTION multiply RETURN NUMBER, --multiply
    member FUNCTION divide RETURN NUMBER    --divide
);
/

--This is body spec.
CREATE OR REPLACE TYPE BODY numbersOp as
  member FUNCTION plus RETURN NUMBER AS
   vblsum NUMBER ;
   BEGIN
     vblsum := n.a + n.b;
     RETURN vblsum;
   --EXCEPTION
   --  WHEN Others THEN
   END plus ;

   member FUNCTION sub RETURN NUMBER AS
    vblsub NUMBER;
     BEGIN
       vblsub := n.b - n.a;
       RETURN vblsub;
     --EXCEPTION
     --  WHEN Others THEN
     END sub;

   member FUNCTION multiply RETURN NUMBER AS
    vblmul NUMBER ;
     BEGIN
       vblmul := n.a * n.b;
       RETURN vblmul;
     --EXCEPTION
     --  WHEN Others THEN
     END;

   member FUNCTION divide RETURN NUMBER AS
    vbldiv NUMBER (10, 3);
     BEGIN
       vbldiv := n.a / n.b ;
       RETURN vbldiv;
     --EXCEPTION
     --  WHEN Others THEN
     END;

END ;
 / 

Now everything has been coded for numbers and it operations. Now let see some demo. Here's the demo code:

DECLARE

  a numbers := numbers(25, 60); --my numbers
  b numbersOp := numbersOp(a);  --I should able to operate them
BEGIN

   Dbms_Output.Put_Line(b.plus);
   Dbms_Output.Put_Line(b.sub);
   Dbms_Output.Put_Line(b.multiply);
   Dbms_Output.Put_Line(b.divide);
--EXCEPTION
--  WHEN Others THEN
END;

If you really find this stuff interesting, then my next blog will make u addicted to the object oriented concepts in oracle.
Till then
HAPPY OBJECTING IN ORACLE!!.