Updatable views in object-oriented databases

Scholl, Marc H.; Laasch, Christian; Tresch, Markus

doi:10.1007/3-540-55015-1_10

Cited by 145 publications

(60 citation statements)

References 19 publications

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“…As is indicated in [7,10], two kinds of views can be identified: object-preserving views, whose instances have the same object identifier as the base instances from which they have been generated, and object-generating views, which create new instances, generating new object identifiers. Object-preserving views facilitate the implementation of the view mechanism and the convenience of using them is described in [10], where it is indicated that object preservation is crucial for a flexible and straightforward view definition facility.…”

Section: Nature Of the View Instancesmentioning

confidence: 99%

“…Object-preserving views facilitate the implementation of the view mechanism and the convenience of using them is described in [10], where it is indicated that object preservation is crucial for a flexible and straightforward view definition facility. In fact, in an OO model the view update problem is closely related to the nature of view instances [7,8,10] because of the existence of object identifiers (object identity). In an object-preserving model, an update on a view instance is automatically propagated to the base instance, whereas in an object-generating model, it is necessary to hold the correspondence between every generated view instance and its base instances, and some updates are not possible.…”

Section: Nature Of the View Instancesmentioning

confidence: 99%

“…We refer to this relationship as IS-VIEW. The alternative choice is to integrate every view in the class hierarchy as a subclass of its base class [9,10], but this strategy requires a data model with multiple classification because a view instance would also be an instance of its base class. Moreover, the extent of a view is a subset of the extent of its base class, but the set of features of a view does not have to be a subset of the features of its base class.…”

Section: Nature Of the View Instances And Placement Of Viewsmentioning

confidence: 99%

“…Views are an example of such functionalities which have not been made available in OODBMS. In the past decade, a lot of effort has been devoted to defining the view concept for OO data model and several OO view models have been proposed [1,6,[7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Extending the ODMG standard with views

García-Molina

Ortín-Ibáñez

Garcı́a-Mateos

2002

Information and Software Technology

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Abstract. Views are an important functionality provided by the relational database systems. However, commercial object-oriented database systems do not support a view mechanism because defining the semantics of views in the context of an object-oriented model is more difficult than in the relational model. Indeed, views are not included in the ODMG standard. In this paper, we present a proposal aimed at including views in the ODMG, by extending the object model and the object definition language (ODL). We consider object-oriented views as having the same functionality as relational views. Views are included in the object model in such a way that i) views are a new kind of data type definition, just as are classes, interfaces and literals, ii) an IS-VIEW relationship is introduced in order to specify the derivation of a view from its base class, and iii) a view instance preserves the identity of its base instance. A view can import attributes, relationships and operations from its base class, and it can also add new operations, derived attributes and derived relationships. The extent of the view is defined by an object query language (OQL) predicate.We also describe a C++ binding showing the practicability of the proposed model.

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Section: Nature Of the View Instancesmentioning

confidence: 99%

Section: Nature Of the View Instancesmentioning

confidence: 99%

Section: Nature Of the View Instances And Placement Of Viewsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Extending the ODMG standard with views

García-Molina

Ortín-Ibáñez

Garcı́a-Mateos

2002

Information and Software Technology

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“…In software development and databases, the notion of context appears in the form of views [3,23,49,1,52,41,9], aspects [46], roles [24,50], or even workspaces which are used to support cooperative work [30]. In machine learning, context is treated as environmental information for concept classification [39,37].…”

Section: Introductionmentioning

confidence: 99%

Contextualization as an independent abstraction mechanism for conceptual modeling

Analyti

Theodorakis²,

Spyratos

et al. 2007

Information Systems

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The notion of context appears in computer science, as well as in several other disciplines, in various forms. In this paper, we present a general framework for representing the notion of context in information modeling. First, we define a context as a set of objects, within which each object has a set of names and possibly a reference: the reference of the object is another context which "hides" detailed information about the object. Then, we introduce the possibility of structuring the contents of a context through the traditional abstraction mechanisms, i.e. classification, generalization, and attribution. We show that, depending on the application, our notion of context can be used as an independent abstraction mechanism, either in an alternative or a complementary capacity with respect to the traditional abstraction mechanisms. We also study the interactions between contextualization and the traditional abstraction mechanisms, as well as the constraints that govern such interactions. Finally, we present a theory for contextualized information bases. The theory includes a set of validity constraints, a model theory, as well as a set of sound and complete inference rules. We show that our core theory can be easily extended to support embedding of particular information models in our contextualization framework.

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A new semantic model with applications in a multimedia database system

Li¹,

Li²,

Wang³

et al. 2008

Concurrency and Computation

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SUMMARYWhen people realized that relational databases fall short in supporting advanced applications including multimedia data management due to the limited modeling power of the relational data model, researchers went ahead with devising semantic, object-oriented data models in the 1980s (until early 1990s). While the later commercial development of database systems has led to the so-called object-relational databases since late 1990s, such a marriage of the two does not actually solve the problems encountered by multimedia data management. In this paper, we present a new semantic multimedia database model based on an extension to the traditional ANSI/SPARC three-level architecture, attempting to cater for the unique requirements of multimedia data management. Various facilities of this semantic multimedia database model are described and discussed. A number of applications have been developed based on this new model, and in this paper we shall describe some of these including recipe modeling and graph mining for retrieval.

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Updatable views in object-oriented databases

Cited by 145 publications

References 19 publications

Extending the ODMG standard with views

Extending the ODMG standard with views

Contextualization as an independent abstraction mechanism for conceptual modeling

A new semantic model with applications in a multimedia database system

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