Titlebook: Entity-Relationship Approach - ER ‘94. Business Modelling and Re-Engineering; 13th International C Pericles Loucopoulos Conference proceedi

Creditee

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

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).

休閑

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.

思考才皺眉

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

burnish

Feigned

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

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.

使激動(dòng)

VERT