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Unlike the relational data model, where Codd s 1970 paper provided a clear, mathematical definition of a relational database, there is no single definition of an object-oriented database. However, the core principles embodied in most objectoriented databases include: I Objects. In an object-oriented database, everything is an object and is manipulated as an object. The tabular, row/column organization of a relational database is replaced by the notion of collections of objects. Generally, a collection of objects is itself an object and can be manipulated in the same way that other objects are manipulated. I Classes. Object-oriented databases replace the relational notion of atomic data types with a hierarchical notion of classes and subclasses. For example, VEHICLES might be a class of object, and individual members (instances) of that class would include a car, a bicycle, a train, or a boat. The VEHICLES class might include subclasses called CARS and BOATS, representing a more specialized form of vehicle. Similarly, the CARS class might include a subclass called CONVERTIBLES, and so on. I Inheritance. Objects inherit characteristics from their class and from all of the higher-level classes to which they belong. For example, one of the characteristics of a vehicle might be number of passengers. All members of the CARS, BOATS, and CONVERTIBLES classes also have this attribute, because they are subclasses of VEHICLES. The CARS class might also have the attribute number of doors, and the CONVERTIBLES class would inherit this attribute. However, the BOATS class would not inherit the attribute. I Attributes. The characteristics that an object possesses are modeled by its attributes. Examples include the color of an object, or the number of doors that it has, and its English-language name. The attributes are related to the object they describe in roughly the same way that the columns of a table relate to its rows. I Messages and methods. Objects communicate with one another by sending and receiving messages. When it receives a message, an object responds by executing a method, a program stored within the object that determines how it processes the message. Thus, an object includes a set of behaviors described by its methods. Usually, an object shares many of the same methods with other objects in higher-level classes. I Encapsulation. The internal structure and data of objects is hidden from the outside world (encapsulated) behind a limited set of well-defined interfaces. The only way to find out about an object, or to act on it, is through its methods, whose functions and behaviors are clearly specified. This makes the object more predictable and limits the opportunities for accidental data corruption.
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I Object identity. Objects can be distinguished from one another through unique object identifiers, usually implemented as an abstract pointer known as an object handle. Handles are frequently used to represent relationships among objects; an object points to a related object by storing the object s handle as one of its data items (attributes). These principles and techniques make object-oriented databases well suited to applications involving complex data types, such as computer-aided design or compound documents that combine text, graphics, and spreadsheets. The database provides a natural way to represent the hierarchies that occur in complex data. For example, an entire document can be represented as a single object, composed of smaller objects (sections), composed of still smaller objects (paragraphs, graphs, and so on). The class hierarchy allows the database to track the type of each object in the document (paragraphs, charts, illustrations, titles, footnotes, and so on). Finally, the message mechanism offers natural support for a graphical user interface. The application program can send a draw yourself message to each part of the document, asking it to draw itself on the screen. If the user changes the shape of the window displaying the document, the application program can respond by sending a resize yourself message to each document part, and so on. Each object in the document bears responsibility for its own display, so new objects can easily be added to the document architecture.
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