"Uma linguagem visual de consulta a banco de dados utilizando o paradigma de fluxo de dados" / One visual query language using data flow paradigm

AUTOR(ES)
DATA DE PUBLICAÇÃO

2003

RESUMO

In spite of many works done on query languages, all existing languages are direct extensions of Structured Query Language – SQL and query-By-Example – QBE. These two languages were developed in the beginning of the Relational Database Management Systems – RDBMS development. Althoug these languages are computationally complete, they take the disadvantage of not supporting graphical interaction with data. One of the the main developments in the database area concerns tools to provide users a simple understand of database content, and friendly extraction of the information. The language described in this work enables users to create graphical queries using data flow diagrams. Besides the graphical query language, this work also shows the Data Flow Query Language - DFQL tool. This tool is a query editor/executer that supports this language, using a set of operators represented graphicaly, and the diagram execution is done by analising the network and producing the respective commands in SQL to realize the query. This commands are sent to the DBMS and the result is shown/recorded according to the query.

ASSUNTO(S)

database relational algebra banco de dados visual query language álgebra relacional linguagem de consulta visual

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