By SuzanneW. Dietrich, Susan D. Urban
Object-oriented databases have been initially constructed instead to relational database know-how for the illustration, garage, and entry of non-traditional facts kinds that have been more and more present in complex purposes of database expertise. After a lot debate concerning object-oriented as opposed to relational database know-how, object-oriented extensions have been finally included into relational expertise to create object-relational databases. either object-oriented databases and object-relational databases, jointly often called item databases, offer inherent help for item positive aspects, comparable to item identification, periods, inheritance hierarchies, and institutions among periods utilizing item references. This monograph offers the basics of item databases, with a selected concentrate on conceptual modeling of item database designs. After an creation to the elemental thoughts of object-oriented information, the monograph offers a evaluation of object-oriented conceptual modeling concepts utilizing side-by-side more desirable Entity dating diagrams and Unified Modeling Language conceptual category diagrams that function classification hierarchies with specialization constraints and item institutions. those object-oriented conceptual versions give you the foundation for introducing case stories that illustrate using item positive factors in the layout of object-oriented and object-relational databases. For the object-oriented database standpoint, the thing information administration crew facts definition language offers a conveyable, language-independent specification of an item schema, including an SQL-like item question language. LINQ (Language built-in question) is gifted as a case learn of an item question language including its use within the db4o open-source object-oriented database. For the object-relational viewpoint, the object-relational positive factors of the SQL regular are provided including an accompanying case examine of the object-relational beneficial properties of Oracle. For completeness of assurance, an appendix presents a mapping of object-oriented conceptual designs to the relational version and its linked constraints. desk of Contents: record of Figures / record of Tables / creation to item Databases / Object-Oriented Databases / Object-Relational Databases
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Extra resources for Fundamentals of Object Databases: Object-Oriented and Object-Relational Design
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The behavior of the class is given by the signatures of the methods defined on the class. Since inheritance is an important feature provided by OODBs, the ODL provides inherent support for the specification of inheritance. There are two forms of inheritance supported by ODL: inheritance of both state and behavior, and the inheritance of behavior only. A class may inherit both the state and behavior of another class as specified by the optional extends clause: class subclass extends superclass ( ...
2 CLASS HIERARCHIES Object-oriented schemas provide inherent support for the specification of class hierarchies. In ODL, the inheritance of state and behavior is supported by the extends clause. Consider as an example the Person class hierarchy from the Hollywood Enterprise, which represents a partial specialization of Person into its disjoint subclasses MovieProfessional and Celebrity. class Person ( ... ) { . . }; class MovieProfessional extends Person ( ... ) { // Specific properties and methods for MovieProfessional }; class Celebrity extends Person ( ...
31 CHAPTER 2 Object-Oriented Databases The OODB community developed the Object Data Management Group (ODMG) standard as a means of establishing a common object interface specification to promote portability among commercial OODB products. The ODMG data model is based on the data model of the Object Management Group (OMG) standard, which provides object-oriented interface capabilities for interoperability across applications. The database designer uses the Object Definition Language (ODL) of the ODMG standard to specify the object types in the application according to the ODMG object model, which is independent of a particular database or vendor.