An introduction to database systems: vol. I (4th ed.)
An introduction to database systems: vol. I (4th ed.)
A comparative analysis of methodologies for database schema integration
ACM Computing Surveys (CSUR)
IFO: a formal semantic database model
ACM Transactions on Database Systems (TODS)
Principles of database and knowledge-base systems, Vol. I
Principles of database and knowledge-base systems, Vol. I
Semantic database modeling: survey, applications, and research issues
ACM Computing Surveys (CSUR)
Fundamentals of database systems
Fundamentals of database systems
A graphical query language for the binary relationship model
Information Systems
A model of queries for object-oriented databases
VLDB '89 Proceedings of the 15th international conference on Very large data bases
A graph-oriented object model for database end-user interfaces
SIGMOD '90 Proceedings of the 1990 ACM SIGMOD international conference on Management of data
A query language for the O2 object-oriented databases
Proceedings of the second international workshop on Database programming languages
A formal approach to object-oriented databases
Data & Knowledge Engineering
Federated database systems for managing distributed, heterogeneous, and autonomous databases
ACM Computing Surveys (CSUR) - Special issue on heterogeneous databases
Heterogeneous distributed database systems for production use
ACM Computing Surveys (CSUR) - Special issue on heterogeneous databases
A Visual Language Compiler for Information Retrieval by Visual Reasoning
IEEE Transactions on Software Engineering
QBD*: A Graphical Query Language with Recursion
IEEE Transactions on Software Engineering
Introduction to object-oriented databases
Introduction to object-oriented databases
Fundamental graphical primitives for visual query languages
Information Systems
Query representation and management in a multiparadigmatic visual query environment
Journal of Intelligent Information Systems - Special issue: advances in visual information management systems
A multiparadigmatic visual environment for adaptive access to databases
CHI '93 INTERACT '93 and CHI '93 Conference Companion on Human Factors in Computing Systems
GraphLog: a visual formalism for real life recursion
PODS '90 Proceedings of the ninth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Object-oriented database systems
Proceedings of the seventh ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
The functional data model and the data languages DAPLEX
ACM Transactions on Database Systems (TODS)
The entity-relationship model—toward a unified view of data
ACM Transactions on Database Systems (TODS) - Special issue: papers from the international conference on very large data bases: September 22–24, 1975, Framingham, MA
A relational model of data for large shared data banks
Communications of the ACM
Data Models
Overview of multidatabase transaction management
The VLDB Journal — The International Journal on Very Large Data Bases
System-Guided View Integration for Object-Oriented Databases
IEEE Transactions on Knowledge and Data Engineering
Cyclic Query Processing in Object-Oriented Databases
Proceedings of the Fifth International Conference on Data Engineering
SNAP: A Graphics-based Schema Manager
Proceedings of the Second International Conference on Data Engineering
A Methodology for View Inegration in Logical Database Design
VLDB '82 Proceedings of the 8th International Conference on Very Large Data Bases
From Minimal Cover to Entity-Relationship Diagram
Proceedings of the Sixth International Conference on Entity-Relationship Approach
Converting A Relational Database Model into an Entity-Relationship Model
Proceedings of the Sixth International Conference on Entity-Relationship Approach
A multiparadigmatic environment for interacting with databases
ACM SIGCHI Bulletin
Formalizing visual interaction with historical databases
Information Systems
Semantic Integration and Querying of Heterogeneous Data Sources Using a Hypergraph Data Model
BNCOD 19 Proceedings of the 19th British National Conference on Databases: Advances in Databases
Intelligent selection and retrieval of multiple time-oriented records
Journal of Intelligent Information Systems
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During the past few years our research efforts have been inspired by two different needs. On one hand, the number of non-expert users accessing databases is growing apace. On the other, information systems will no longer be characterized by a single centralized architecture, but rather by several heterogeneous component systems. In order to address such needs we have designed a new query system with both user-oriented and multidatabase features. The system's main components are an adaptive visual interface, providing the user with different and interchangeable interaction modalities, and a “translation layer”, which creates and offers to the user the illusion of a single homogeneous schema out of several heterogeneous components. Both components are founded on a common ground, i.e. a formally defined and semantically rich data model, the Graph Model, and a minimal set of Graphical Primitives, in terms of which general query operations may be visually expressed. The Graph Model has a visual syntax, so that graphical operations can be applied on its components without unnecessary mappings, and an object-based semantics. The aim of this paper is twofold. We first present an overall view of the system architecture and then give a comprehensive description of the lower part of the system itself. In particular, we show how schemata expressed in different data models can be translated in terms of Graph Model, possibly by exploiting reverse engineering techniques. Moreover, we show how mappings can be established between well-known query languages and the Graphical Primitives. Finally, we describe in detail how queries expressed by using the Graphical Primitives can be translated in terms of relational expressions so to be processed by actual DBMSs.