Constraint-Based Database Interoperability

在当今高度互连的网络中，越来越需要在位于不同站点并使用不同数据模型构建的数据库之间进行通信。 在许多数据模型中，数据库的实际表示和抽象含义之间的关系往往不明确，这使得互操作性问题变得更加困难。因此，直接在这些模型之间进行互操作是不方便的。 然而，约束数据库中的表示和含义之间存在着明确的关系，约束数据库实际上是一组由语言中允许的约束类型参数化的数据模型。 该项目演示了如何使用约束数据库来表达大多数实际的时间和空间数据模型，以及如何在此上下文中解决互操作性问题。 不同数据模型之间的转换表示为约束查询语言中的查询。 此外，约束查询语言作为一个方便的中间层之间的查询翻译不同的查询语言。 本项目探讨基于约束的数据库互操作性的理论基础及其实际应用。 它将促进不同时空数据库应用程序之间的数据共享和查询重用。

In today's highly interconnected networks there is an increasing need to communicate among databases located at different sites and built using different data models. The interoperability problem is made more difficult by the fact that in many data models there is often an unclear relationship between the actual representations and the abstract meanings of the databases. Hence it is unwieldy to interoperate directly among pairs of those models. However, a clear relationship exists between representation and meaning in constraint databases, which are actually a set of data models parameterized by the types of constraints allowed in the language. This project demonstrates how to express most of the practical temporal and spatial data models using constraint databases and how to solve in this context the interoperability problem. Translations between different data models are expressed as queries in constraint query languages. In addition, constraint query languages serve as a convenient intermediate layer for query translation between different query languages. This project explores the theoretical foundations of constraint-based database interoperability and its practical applications. It will facilitate data sharing and query reuse among different temporal and spatial database applications.