Session 3 - Object Oriented Databases

Relationship type (in the real world) :

1. Many to many
2. One to many
3. One to one

UML used:

Structural:

1. Class Diagram
2. Object diagram
3. Component Diagram
4. Deployment diagram

 Behavioral:

1. Use Case Diagram
2. Sequence Diagram
3. Collaboration Diagram
4. State chart Diagram
5. Activity Diagram

Pointer Swizzling : Ketika data penuh, maka dilakukan swizzling.
Persistence : Keabadian objek (objek dapat bertahan lama walau aplikasinya sudah dihentikan)

Contoh:  
Excel atau SQL (non-volatile data, stored in harddisk not only RAM)
Data masih bisa dibuka lagi.

Concurrency control : Data dipakai oleh lebih dari satu user dalam waktu yang bersamaan.
Recovery Control : (?) Kalau sudah di commit, data harus bisa direcover kembali.


Object Oriented Characteristic, such as:

1. Inheritance : staff under person, so all the person is inherited (schema consistency (?)   Banyak subclass (child) menginherit satu superclass (parent)  (single inheritance)
2. Encapsulation :
3. Method :
4. Polymorphism
5. Extensibility :
6. Versioning : 

          Every data have version, so you can load the data when you need
          (monthly, weekly or daily).

Object Request Broker : yang menghubungkan 2 database system yang memungkinkan adanya email, web browser, word processor, spredsheet, etc.

Set : Collection unorder, readonly, non-duplicate
Bag : Duplicate able
List : Ordered

Array : Limited length
Dictionary : (?)

Subekti
Advance Database Lecturer

Object Oriented Programming - Session 2

Weakness of Database Management System

Impedance Mismatch** Computational incomplete
Example : select * from mahasiswa where nim > 100
                if nim > 10000 then ...

select * menghasilkan multiple row (common database can do this),
but in other way IF hanya mengolah 1 field.

to solve this problem we can use [CURSOR]

Message vs Method
Message adalah proses pemanggilan fungsi.
Method adalah isi fungsi tersebut. Misalnya kalau fungsi hitung, maka disebut process hitungnya

Inheritance
Method diturunkan Attributte diturunkan

Subekti
Advance Database System (ADS)