The Application Of Object Oriented Technology In Database Engineering

The history of the development of database technology can be divided into three phases: the first generation is the reticulation / hierarchical data model based on database; The second generation is the relational data model based database; The third generation database which has the object oriented character breakthroughs the localization of the traditional database model which is unable to build model based on complex data structure. The third generation has led the database system to a new time. It can be said that the development of database system is the development of data model.In the fields of engineering application, applied data structure appears more complex and highly nontstrucrured, to fit for the needs of factual application. People bring out many new data models applied in different fields. These models can be extended relational model, object oriented model and other special data models. These models show high ability of dada modeling on complex data hi engineering application area.Aim at special application, this article brings out some data models based on nonstructured engineering data model and use the theory in engineering data model research area for reference, combines the data modeling technology with the object oriented technology, uses the object oriented technology to abstract objects for the application system and abstract the application frame, converts the polymorphism character of the object oriented frame to the complex data storage character, realizes the permanent management of object method hi the object oriented system, and then from the position of data independence, separates the method independent management from the object frame and achieves the polymorphism and extensibility of the object oriented system, fulfills the enterprise application who need customize the software function.This article also actively explores the permanence of object method hi object-oriented database. Object oriented database has experienced the phases which are permanent language system, object-relational system and pure object oriented system. In object system of special applied area, object is comparatively more stable than method, we can combine the object oriented frame with the method permanent management, hence at this means realize the permanent management of the object oriented system. This is a perfect application of the theory of the object oriented database system.This article gives the theory applied in the condition whose requirements frequently change, through the management of the object method, minimizes the costs of the software maintenance, and maximizes the extensibility of the software. Object method database system has been applied to the area whose demands vary frequently. Software manufactory uses the MDB interface to tailor the function through adding method into MDB or updating method. The client also can do that, hence avoid the maintenance of the code and the research shows good foreground in software production.