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Component-oriented database
open-in-new
<h2 id="concepts">Concepts</h2> <p>The paradigm of <i>component-orientation</i> (CO) is a development of the <a href="/facts/Object-oriented_software_engineering/TxNMEcao">object-orientation</a> (OO) in <a href="/facts/Mathematical_programming/oRn8Iv5I">programming</a> and <a href="/facts/Data_modeling/bryA2moP">data modeling</a>, leading toward the extreme the possibilities of reuse.<a class="footnote-ref" id="fnref:1" href="#fn:1"><sup>1</sup></a> In this model type, <a href="/facts/Class_(computer_programming)/zvzkSAtE">classes</a> are aggregate in cells called <i>components</i>, that execute a role similar to the <a href="/facts/Function_(computer_science)/9vFJrg0A">function</a> in the <a href="/facts/Structured_programming/zA8b8dP1">structured programming</a>,<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a> a way of processing information contemporary to the <a href="/facts/Relational_database/pEKGmJLy">relational database</a> model.<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a> </p><p>So the component-orientation mixes a set of features of its predecessor models. Understanding it is simpler while thinking of the <i>visual component</i>, that is an <a href="/facts/Application_software/YQuj7Kog">application</a><a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a> which not being deployed into an <a href="/facts/Executable/VSst9eLA">executable</a> or <a href="/facts/Bytecode/EPkMFR7M">bytecode</a> but otherwise turned to be linked by an icon inside another application, icon when one clicks on it implements certain tasks.<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a> Then this concepts can be extended to <i>non-visual components</i>.<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a> </p><p>In database activities, the component, visual or not, is an aggregate of <i>classes</i>, in the sense of <i>OO</i>, that can be linked to other ones by <i>adapters</i>.<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a> </p><p>As after the OO model conception data and code programming code are mixed in a cohesive body,<a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a> there are some difficulties in conceiving where the <i>CODB</i> and <i>CO</i> programming are separate one from the other. Although this enigma is important in conceptual epistemological area, in practical <a href="/facts/Data_processing/74EKCDAq">data processing</a> there isn't so importance in this question because of usage of mapping models to large scale used software, like the mappings called <i><a href="/facts/ORDBMS/XRQqqj5c">ORDBMS</a></i> and <i>CRDB</i> (component-relational database), in which the separation of data and code are still well defined.<a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a> </p> <h2 id="implementation">Implementation</h2> <p>In <i>programming</i> activity, the CO is often taken place with large-scale used OO languages (like <a href="/facts/C%2B%2B/Et0F2qn9">C++</a>, <a href="/facts/Java_(programming_language)/9ScgFyAL">Java</a>) with <i>mapping adaptation</i>. In <a href="/facts/Software_design/61rGr5Ej">designing</a> the paradigm is supported by <a href="/facts/Unified_modeling_language/3tlNS0tH">UML</a>. In <i>data modeling</i>, <i>data administration</i> and <a href="/facts/Database_administration/86tgW5Nf">database administration</a>, the <i>mapping adaptation</i> is alike the <a href="/facts/ORDBMS/XRQqqj5c">ORDBMS</a> paradigm. The adapted paradigm to component-based models is known as <i>component-relational database</i> (CRDB).<a class="footnote-ref" id="fnref:10" href="#fn:10"><sup>10</sup></a> </p> <h2 id="advantages">Advantages</h2> <p>The main advantage of the component-oriented thinking is the optimization of reusability of work. The CO paradigm allows the use of <i>ready to use</i> applications as modules to new and bigger projects.<a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a> </p><p>The notions of OO such as <a href="/facts/Encapsulation_(object-oriented_programming)/kzDnbHPe">encapsulation</a>, <a href="/facts/Inheritance_(computer_science)/a7R1xv8n">inheritance</a> and <a href="/facts/Polymorphism_(computer_science)/S3cCKsVT">polymorphism</a> do not necessarily lead to the idea of reusing applications as modules of new works. The CO thinking also assures that components are fully tested, as a real application, and thus there is in this model the paroxism of reuse,<a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a> as well as the feature of understandability to end users, as corollary of the <i>app->comp</i> way of realizing the IT works. </p><p>Even using the same software that are present in OO paradigm, there are many specific consequences in the world of data-oriented activities. In analogous way, whole models composed of classes can be treated as a part (component) of a new more comprehensive model. </p> <h2 id="bibliography">Bibliography</h2> <ul><li>Buschmann, Frank; Meunier, Regine; Rohnert, Hans; Sommerlad, peter. Pattern-Oriented Software Architecture, Volume 1. John Wiley & Sons, 1996, <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 047195869-7.</li> <li>Cho, Eun-Sun; Han, Sang-Yong; Kim, Hyoung-Joo. A New Data Abstraction Layer Required For OODBMS, Proceedings of 1997 International Database engineering and Applications Symposium (IDEAS’97).</li> <li>Clemente, Pedro J.; Hernandez, Juan. Aspect Component Based Software Engineering, Proceedings of the Second AOSD Workshop on Aspects, Components, and Patterns for Infrastructure Software (ACP4IS), March 2003.</li> <li>Clements, Paul. From subroutines to subsystems: Component-Based Software Development. Brown, Allen. Component-Based Software Engineering: Selected Papers from Software Institute, 1996.</li> <li>Erich Gamma, Erich; Helm, Richerd; Johnson, Ralph; Vilssides, John. Design Patterns. Elements of Reusable Object-Oriented Software. Addison-Wesley, 1995, <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 0201633612.</li> <li>Garcia-Molina, Hector; Ulman, Jeffrey D.; Widom, Jennifer, Database Systems – A complete book. Prentice Hall, 2002, <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 0131873253.</li> <li>Pfister, C.;Szyperski, C.. Why Objects Are Not Enough, Proceedings of Component Users Conference, Munich, Germany, 1996.</li> <li>Rotaru, Octavian Paul;Dobre, Marian;Petrescu, Mircea. Integrity and Consistency Aspects in Component-Oriented Databases, Proceedings of the International Symposium on Innovation in Information.</li> <li>Stroustrup, Bjarne. Why C++ is not just an Object-Oriented Programming Language, Addendum to OOPSLA95 Proceedings, ACM OOPS Messenger, October 1995.</li> <li>Szyperski, Clemens (1998). <i>Component Software – Beyond Object-Oriented Programming</i>. ACM Press/Addison-Wesley. <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 0201178885.</li></ul> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Object_Database/Vfej0eDT">Object Database</a></li> <li><a href="/facts/Relational_model/VFf4dDIU">Relational model</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Cesare, Sergio de; Lycett, Mark; Macredie, Bobert. D. (2006). Development of Component-Based Information Systems. Vol. 2 (1st ed.). New York: M. E. Sharp. p. 52. ISBN 0765612488. ISSN 1554-6152. <a href="0765612488" target="_blank">0765612488</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Fröhlich, Peter Hans (2003). Component-Oriented Programming Languages: Why, What, and How (1 ed.). Irvine: University of California. p. 2. <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Sureau, Denis (27 March 2012). "History of Programming Languages and Their Evolution". Scriptol. Archived from the original on 16 October 2012. Retrieved 29 March 2012. <a href="https://web.archive.org/web/20121016231922/http://www.scriptol.com/programming/history.php" target="_blank">https://web.archive.org/web/20121016231922/http://www.scriptol.com/programming/history.php</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>or even a small application or applet <a href="/wiki/Applet" target="_blank">/wiki/Applet</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>"The Benefits of Modular Programming" (PDF). Netbeans Org. 2007. Archived from the original (PDF) on 12 January 2012. Retrieved 29 March 2012. <a href="https://web.archive.org/web/20120112061134/http://netbeans.org/project_downloads/usersguide/rcp-book-ch2.pdf" target="_blank">https://web.archive.org/web/20120112061134/http://netbeans.org/project_downloads/usersguide/rcp-book-ch2.pdf</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>Piveta, Eduardo Kessler; Zancanella, Luiz Carlos. "Aurélia: Aspect Oriented Programming Using a Reflective Approach" (PDF). IT Department of Santa Maria University. Retrieved 29 March 2012.[permanent dead link] <a href="http://www-usr.inf.ufsm.br/~piveta/files/pivetaEcoopWs01.pdf" target="_blank">http://www-usr.inf.ufsm.br/~piveta/files/pivetaEcoopWs01.pdf</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>"Components: Interfaces and Adapters". Twisted Matrix Labs. Archived from the original on 24 February 2012. Retrieved 29 March 2012. <a href="https://web.archive.org/web/20120224000708/http://twistedmatrix.com/documents/current/core/howto/components.html" target="_blank">https://web.archive.org/web/20120224000708/http://twistedmatrix.com/documents/current/core/howto/components.html</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>Guthery, Scott (1 December 1989). "Are the Emperor's New Clothes Object Oriented?". Dr. Dobb's Journal. Retrieved 29 March 2012. <a href="http://drdobbs.com/184408251" target="_blank">http://drdobbs.com/184408251</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>"Introduction to Java in Oracle Database". Oracle docs. Retrieved 30 March 2012. <a href="http://docs.oracle.com/cd/E11882_01/java.112/e10588/chone.htm" target="_blank">http://docs.oracle.com/cd/E11882_01/java.112/e10588/chone.htm</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> <li id="fn:10"><p>Hameurlain, Abdelkader. Lecture Notes in Computer Science. <a href="#fnref:10" class="footnote-back-ref">↩</a></p></li> <li id="fn:11"><p>"The Benefits of Modular Programming" (PDF). Netbeans Org. 2007. Archived from the original (PDF) on 12 January 2012. Retrieved 29 March 2012. <a href="https://web.archive.org/web/20120112061134/http://netbeans.org/project_downloads/usersguide/rcp-book-ch2.pdf" target="_blank">https://web.archive.org/web/20120112061134/http://netbeans.org/project_downloads/usersguide/rcp-book-ch2.pdf</a> <a href="#fnref:11" class="footnote-back-ref">↩</a></p></li> <li id="fn:12"><p>Grundy, John; Patel, Rakesh (2000). "Developing Software Components with the UML, Enterprise Java Beans and Aspects" (PDF). Faculty of Information and Communication Technologies of Swinburne Universe of Technology. Archived from the original (PDF) on 16 March 2014. Retrieved 30 March 2012. <a href="https://web.archive.org/web/20140316211820/http://www.ict.swin.edu.au/personal/jgrundy/papers/aswec2001.pdf" target="_blank">https://web.archive.org/web/20140316211820/http://www.ict.swin.edu.au/personal/jgrundy/papers/aswec2001.pdf</a> <a href="#fnref:12" class="footnote-back-ref">↩</a></p></li> </ol>