Accession Number : ADA255225


Title :   User Interface of DFQL: An Object-Oriented Approach


Descriptive Note : Master's thesis Feb 1990-Jun 1992


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF COMPUTER SCIENCE


Personal Author(s) : Li, Chang-Tsun


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a255225.pdf


Report Date : Jun 1992


Pagination or Media Count : 181


Abstract : In recent years, many graphical approaches have been proposed to lift the inconvenience of text-based query, language among end-users. The new query language called DFQL (DataFlow Query Lan guage) is a fully graphical interface to the relational model based on a dataflow paradigm. It only requires users to connect some well-defined operators which have been given an equivalent one-to- one correspondent functionality (or construct) in traditional query language (SQL in this case). All of the power of current query languages and sufficient expressive power and functionality are retained. But some shortcomings of DFQL user interface still exist. This thesis is to introduce a more ease-to-use and ease-to-learn user interface, so the shortcomings we found in DFQL user interface can be lifted and the productivity and power of the new version of DFQL can be increased. We have adopted object-oriented programming approach in our implementation and the benefits of using object-oriented programming in our development are also discussed.


Descriptors :   *SYSTEMS APPROACH , *MAN COMPUTER INTERFACE , MODELS , HUMANS , INTERFACES , POWER , BENEFITS , APPROACH , LIFT , PRODUCTIVITY , COMPUTER PROGRAMMING , THESES , LANGUAGE


Subject Categories : Human Factors Engineering & Man Machine System


Distribution Statement : APPROVED FOR PUBLIC RELEASE