The Journal of Information Technology and Database (정보기술과데이타베이스저널)
- Volume 1 Issue 1
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- Pages.63-81
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- 1994
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- 1226-3559(pISSN)
Backward Propagation of User-Defined Integrity Constraints On Active Object-Oriented Database
능동적 객체지향 데이타베이스에서 사용자 정의 제약조건의 역방향 전달에 관한 연구
Abstract
The trigger mechanism in active object-oriented database systems is known to be a good tool for describing user-defined integrity constraints. It cannot adequately support, however, certain integrity constrains specified on the objects in class composition hierarchy. Those are the cases where the constraints must be maintained in the forward direction along the composition hierarchy as well as in the backward direction We call theses kinds of problems "backward propagation problem" and investigate several ways to resolve them using the currently available techniques. Based on them, a new constructor, called CONSTRAIN
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