Object query diagram for object-oriented query system객체지향질의체계를 위한 객체질의도

Cited 0 time in webofscience Cited 0 time in scopus
  • Hit : 610
  • Download : 0
Development of efficient and powerful visual interfaces is major current challenge for database system designers. Despite large investment of research efforts in the domain of user interfaces, database users are still confronted with textual languages for their interaction with database systems, especially with the object-oriented database systems. This thesis presents a visual query language called Object Query Diagram and its graphical interface for a visual query system in object-oriented databases. Unlike relational queries, in which all tuple instances of a relation are always considered as a single entity of designation, in object-oriented queries a class may consist of a number of entities to which the operations in queries may actually apply. As a result, visual query languages for object-oriented databases, in which queries have been formulated based on classes, suffered from the deficiency in describing an entity of designation in queries, which causes some serious drawbacks. First, to designate a part of a class, navigation through object structures through the repetitive use of complex path expression is necessary. Secondly, to specify a non-association between objects, an additional non-association operator is required. Finally, use of a class as a compound of several entities of designation prevents the basic structures of visual query languages from being extended to express complex queries since the change of a part of a class could give an influence on the other part of the class. To overcome the drawbacks of visual query languages based on classes and to support the features of object-oriented data models, e.g., object identity, multivalued attributes, and class hierarchy, the object query diagram is proposed. The object query diagram is based on two constructs: class and object set. An object set is a specialization of a class and is used as a primitive entity of designation in queries. The key idea of the object query diagram is to describe ...
Advisors
Moon, Song-Chunresearcher문송천researcher
Description
한국과학기술원 : 전산학과,
Publisher
한국과학기술원
Issue Date
1994
Identifier
69077/325007 / 000845010
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 전산학과, 1994.2, [ v, 127 p. ]

Keywords

객체 지향 모델.; 질의어.

URI
http://hdl.handle.net/10203/33005
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=69077&flag=dissertation
Appears in Collection
CS-Theses_Ph.D.(박사논문)
Files in This Item
There are no files associated with this item.

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0