Creditee
发表于 2025-3-26 20:58:56
Database evolution: the DB-MAIN approach,on a generic data structure model, on a transformational approach to database engineering, and on a design process model. The paper discusses how this framework allows formalizing these evolution strategies, and describes a generic CASE tool that supports database applications maintenance.
FECT
发表于 2025-3-27 03:33:54
Declarative specification of constraint maintenance,the semantics of repair actions as computations which react to constraint violations, then we establish sufficient conditions for ensuring their termination, and finally we show how repair actions can be integrated in the SQL2 standard and implemented by means of relational triggers (written in Oracle).
休闲
发表于 2025-3-27 07:21:31
Cardinality consistency of derived objects in DOOD systems,opose a solution based on a deductive language, called ERCLog, for an object and relationship data model. ERCLog explicitly manages the cardinalities of the attributes of the objects and of the links between objects. This information allows the static checking of the consistency of the programs.
思考才皱眉
发表于 2025-3-27 10:08:19
0302-9743 delling integrity constraints, object-oriented databases, active databases, CASE, reverse engineering, information system modelling, schema coordination, and re-engineering.978-3-540-58786-6978-3-540-49100-2Series ISSN 0302-9743 Series E-ISSN 1611-3349
手段
发表于 2025-3-27 16:45:07
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burnish
发表于 2025-3-27 21:26:15
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Feigned
发表于 2025-3-28 01:04:03
On the representation of objects with polymorphic shape and behavior,ts by allowing the same object to be represented under different perspectives — possibly at discrete points in time — with each perspective having its own state and behavior. The concept of roles is used to implement dynamic properties and aspects of objects and provides for added modeling power and flexibility.
minion
发表于 2025-3-28 02:31:04
Conceptual modelling and manipulation of temporal databases,y representation and manipulation of temporal knowledge. More specifically, this paper is concerned with the definition and manipulation of temporal data at the conceptual level. It therefore concentrates on describing such a tool, namely the query language ERT-SQL, with the help of some illustrative examples.
使激动
发表于 2025-3-28 07:15:17
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VERT
发表于 2025-3-28 12:05:39
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