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The relational model has several limitations. One of its biggest problems is its limited capability to represent real-world entities, which are much more complex than what can be represented in tuples and relations. The model is especially weak when it comes to distinguishing among different kinds of relationships between entities. You can t represent and manipulate complex data in traditional relational databases the set of operations you can perform in relational models isn t adequate for many real-world applications that include objects with non-numerical attributes. The limitations of the traditional relational model in modeling several real-world entities led to research into semantic data models and the so-called extended relational data models. Two data models now compete for the mantle of successor to the relational model: the object-oriented data model and the object-relational data model. Databases based on the first model are called objectoriented database management systems, or OODBMSs, and databases based on the second model are called object-relational database management systems.
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The Object Model
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Object (or object-oriented) databases are based primarily on object-oriented programming languages such as C++, Java, and Smalltalk. ODBMSs are created by combining database capabilities with the functionality of object-oriented programming languages. In this sense, you can view an ODBMS as an extension of the object-oriented language with data-concurrency and data-recovery capabilities added on to it. The object-oriented language is used both for application development and data storage. Object-oriented languages are used to create objects, which are the basic components of the ODBMS. Several terms have special meanings in object-oriented environments: Objects are defined as entities containing the attributes of a real-world object and its associated actions. Properties are the various attributes of an object. Methods are functions in the object world, and they define the behavior of the object. Objects communicate by means of messages. A class is a grouping of objects that have the same attributes. Instances are the actual incarnations of objects in the class. Classes can be divided into subclasses, with the parent class being called the superclass. The following three concepts are fundamental to understanding object-oriented systems: Polymorphism: Polymorphism is the ability of objects to react differently when presented with different sets of information (in the form of parameters). Object-oriented languages allow different methods to be run depending on the set of parameters that you specify. In a non-object-oriented programming language, the only way to complete two different tasks is to have two functions with different names. Encapsulation: This term refers to objects including information about both what they are (their properties) and what they can do (their methods). Thus, code and data are packaged together. For example, if a person were an object in the model and there were a method to calculate the person s annual salary, the code (or method) for calculating the salary would be encapsulated with the instance object, which is the person. Inheritance: Inheritance allows one class to extend another to inherit some characteristics from another class and to add more characteristics of its own. For example, a Student object could be a subclass of a Person class.
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The Object-Relational Model
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Although pure object methodology is appealing, in actual practice it is quite difficult to implement. ORDBMSs strive to combine the best that relational models have to offer while adding as much of the object-oriented methodology as possible. Oracle says that its ORDBMS model seeks to put complex business data in the basic relational database; the fundamental tabular form of the relational model is retained. The basis for Oracle s (and other vendors ) ORDBMS offerings is the SQL standard named ANSI/ISO/IEC 9075:2003 (also called the SQL:2003 standard). The ORDBMS is somewhat of a hybrid between the traditional relational and the pure objectoriented databases. It doesn t quite achieve the implementation of all the key precepts of an object-oriented database, such as encapsulation. The ORDBMS is really the relational model with a few object-oriented features added on. You can choose to ignore the object-oriented features completely and use the database as a purely traditional relational database. All the database information is still in the form of tables.
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