By Akmal B. Chaudhri
Take a travel with major researchers and builders for a pragmatic examine item databases. even if you presently paintings with or are contemplating relocating to item databases, Chaudhri and Zicari offer a suite of real-world case reports and examples that exhibit how a number of the world's top businesses and study associations are leveraging Java, XML, and item Relational structures to construct strong databases. beginning with a complete advent to item and object-relational databases, the publication then deals exact discussions on a number of the most modern subject matters within the box akin to JDBC and SQLJ help in relational databases and database modeling utilizing UML.You'll additionally find out about object-to-relational mapping instruments, architectural matters that impact functionality, and the problems of complexity and scale.How renowned instruments from machine affiliates, eXcelon, GemStone, Objectivity, Oracle, Versant, and Poet have been utilized in the case experiences can also be discussed.The spouse website atwww.wiley.com/compbooks/chaudhri contains hyperlinks to object-oriented database software program purposes and extra assets. stopover at our website at www.wiley.com/compbooks/Visit the better half site at www.wiley.com/compbooks/chaudhri
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Example text
Programming tools as well as a user interface generator have been developed as part of the project. Considerable research results have been achieved concerning the formal definition of the data model and the specification of a declarative, SQL-like algebraic query language. From September 1992 until November 1995, the European Project GOODSTEP had investigated the use of O2 as the basis for a Software Engineering Environment, with the goal to enhance and improve the product. In the context of the GOODSTEP project the following issues have been investigated for O2: schema evolution, versions, view mechanisms, triggers, and concurrency control (in particular, the extension of the original page-based mechanism to an object-level mechanism).
Using the DBMS mechanisms, these objects can be stored and shared. As a result, OODBMSs are highly flexible, supporting a wide range of structures and types. They can be thought of as an extension of an object-oriented programming environment, since the integration with the programming language is almost seamless. This approach differs from object-relational DBMSs, which introduce a separate API (based on SQL) to work with stored data. When using ORDBMSs, class definitions must be 7 8 Chapter 1 mapped into data types supported by the database system.
An aggregation relationship is established between two classes, C and C (whenever C is specified as domain of a property of C). Such a relationship specifies that C is defined in terms of C. Since C can in turn be defined in terms of other classes, the set of classes in the schema is organized into an aggregation hierarchy. The following is an example of a class declaration, in which the properties and the operations of the class instances are declared (we adopt the syntax of ODMG Object Definition Language ODL).