Elisa Bertino and Giovanna Guerrini, Extending the ODMG object model with composite objects, Proceedings of the Conference on Object-Oriented Programming Systems, Languages and Applications, 1998 10 (1998), 259--270.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....extending database models to incorporate relationship semantics. We have grouped these approaches into four areas: Relational Database Management Systems (RDBMS) Object Relational Database Management Systems (ORDBMS) Object Oriented Database Management Systems (OODBS) and the ODMG Object Model [3]. The extensions to RDBMSs generally include modeling relationships as tables, and further extending SQL like languages to incorporate relationships and inheritance hierarchies pertaining to those relationships [23, 26] In [30] an attempt was made to implement semantic extensions to an ORDBMS; ....

....evolution in the representation of semantic relationships of OODBs is a subject of future investigation. We have found that there remains considerable discussion and debate in the literature on extensions to the object model itself and the definitions of aggregate and composite relationships [3, 5, 6, 7, 13, 22]. A paper by Henderson Sellers and Barbier [14] alludes to the continued difficulty in defining aggregation. They argue that ownership is a consequent property of a set of primary aggregation properties that they define. Their classification of the ownership relationship may work well within the ....

Elisa Bertino and Giovanna Guerrini, Extending the ODMG object model with composite objects, Proceedings of the Conference on Object-Oriented Programming Systems, Languages and Applications, 1998 10 (1998), 259--270.

....handles, leading to complexity overhead for the user and risk of data corruption. Therefore, the management of object roles and evolution is an active subject of research in many areas such as OrientedObject Knowledge Representation [BW77] FV88] BD96] Programming Languages [SZ89] SS89] BG95] BG98] Conceptual and O ce Information Modelling [Per90] Coa92] BBMP95] and Databases [ABGO93] AdS95] GSR96] PK97] WCL97] In the eld of Databases, however, additional constraints such as strong typing, uniqueness of object identi er, inheritance, persistence, late binding, query languages, ....

Elisa Bertino and Giovanna Guerrini. Extending the ODMG object model with composite objects. In Proceedings of the 13th Conference on Object-Oriented Programming, Systems, Languages, and Applications (OOPSLA-98), volume 33, 10 of ACM SIGPLAN Notices, pages 259270, New York, October 1822 1998. ACM Press.

....and does not allow more complicated queries. Dynamic queries are related to incremental join result recalculation in databases [BC79, BLT86] We use the basic insights of this work to implement the incremental query evaluation scheme. Coping with inter object constraints in the extended ODMG model [BG98] may require methods similar to dynamic query based debugging. Slicing [Wei81, Tip95] determines the program statements that affect a certain program point. It could be modified to determine the change sets of queries. 8. Conclusions The cause effect gap between the time when a program error ....

Bertino, E., Guerrini, G., Extending the ODMG Object Model with Composite Objects, Proceedings of OOPSLA'98, pp. 259-270, Vancouver, October 1998. Published as SIGPLAN Notices 33(10), October 1998.

.... objects [Boo94] Today, most OODB systems provide some implicit relationship support in the form of reference attributes as well as explicit relationship support [Obj93, Tec92, Obj94] Work is also ongoing to provide more specific modeling constructs such as aggregation at the OODB system level [BG98] All work thus far has primarily focused on providing support for the definition of relationships at the schema level [Cea97] and for managing them at the object level [BG98] Schema Evolution of Relationships. At the same time, changing application requirements have made schema evolution a ....

.... Obj94] Work is also ongoing to provide more specific modeling constructs such as aggregation at the OODB system level [BG98] All work thus far has primarily focused on providing support for the definition of relationships at the schema level [Cea97] and for managing them at the object level [BG98] Schema Evolution of Relationships. At the same time, changing application requirements have made schema evolution a critical task [Sjo93] Today, most OODB systems recognize this and provide some basic evolution support [Tec94, Tec92, BMO 89, Obj93, BKKK87, Inc93] However, while some OODB ....

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E. Bertino and G. Guerrini. Extending the ODMG Object Model with Composite Objects. In OOPSLA, pages 259--270, 1998.

....not to modify the Component behavior but to maintain extra information about inter component dependence. This extra information helps the system to provide fault tolerance and automatic con guration and o ers Components the possibility of being aware of their dependencies. Bertino and Guerrini [BG98] extended the ODMG object database standard data model to include the concept of Composite objects. An extension of the ODMG object de nition language (ODL) is used to specify the semantics of the dependencies between composite objects and their components. Based on the ODL de nition, the system ....

Elisa Bertino and Giovanna Guerrini. Extending the ODMG Object Model with Composite Objects. In Proceedings of the OOPSLA'98, October 1998.

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