1 Pertemuan 19 Building Object Database Application (Lanjutan bagian 2) Matakuliah: M0174/OBJECT ORIENTED DATABASE Tahun: 2005 Versi: 1/0

2 Learning Outcomes Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu : Mahasiswa dapat Menjelaskan ikatan antara programming language dengan object database (C2) Mahasiswa dapat Menjelaskan pembuatan object database application (C2)

3 Outline Materi Creating object and deleting object Modification object Manipulating relationship Manipulating named object OQL queries

4 Creating and Deleting Object C++ OML provides features for accessing and manipulating the contents of an object database. This is done mostly in such a way that the C++ ODL create, deletes, and manipulates persistent objects in the same way that C++ does for “conventional” transient objects.

5 Modification object The state of an object (transient or persistent) is changed by either updating its properties or executing operation on it Example

6 Manipulating relationship Relationships are implemented in C++ OML/ODL as data member defined on Ref classes. The value of a relationship data member can therefore comprise one or more references to persistent (or transient) object

7 Manipulating named object The C++ ODL/OML allows us to name individual objects and use the object names to retrieve the named object The object names provide access points into an object database

8 OQL queries OQL queries can be executed from within C++ OML/ODL programs in two ways either by using the queries operation on collection objects or by using the OQL_Query interface

9 OQL queries Examples D_OQL_Queries q(“select so.place_by from salesorders so where so.date > $1”); q << earliest_order_date; D_oql_execute (q, result);

10 SUMMARY C++ OML uses the additional built-in classes to create, delete, and manipulate persistent objects In Addition, OQL queries can be executed via a loose binding, using query or oql operations