126 lines
6.8 KiB
HTML
126 lines
6.8 KiB
HTML
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<!-- BeginDsi "dsi/head.html" -->
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>Embedthis Appweb 4.3.4 Documentation</title>
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<meta name="keywords" content="embedded web server, web server software, embedded HTTP, application web server,
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embedded server, small web server, HTTP server, library web server, library HTTP, HTTP library" />
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<meta name="description" content="Embedthis Sofware provides commercial and open source embedded web servers for
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devices and applications." />
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<meta name="robots" content="index,follow" />
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<link href="../../../doc.css" rel="stylesheet" type="text/css" />
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<link href="../../../print.css" rel="stylesheet" type="text/css" media="print"/>
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<!--[if IE]>
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<link href="../../../iehacks.css" rel="stylesheet" type="text/css" />
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<![endif]-->
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<link href="http://www.google.com/cse/style/look/default.css" type="text/css" rel="stylesheet" />
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</head>
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<body>
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<div class="top">
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<a class="logo" href="http://appwebserver.org/"> </a>
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<div class="topRight">
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<div class="search">
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<div id="cse-search-form"></div>
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<div class="version">Embedthis Appweb 4.3.4</div>
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</div>
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</div>
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<div class="crumbs">
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<a href="../../../index.html">Home</a>
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<!-- EndDsi -->
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><a href="index.html">ESP Guide</a>> <b>Model-View-Controller Framework</b>
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</div>
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</div>
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<div class="content">
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<div class="contentRight">
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<h1>Quick Nav</h1>
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<ul class="nav">
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<li><a href="#models">Models</a></li>
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<li><a href="#views">Views</a></li>
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<li><a href="#controllers">Controllers</a></li>
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</ul>
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<!-- BeginDsi "dsi/espSeeAlso.html" -->
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<h1>See Also</h1>
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<ul class="nav">
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<li><a href="../../../guide/esp/users/using.html">ESP Overview</a></li>
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<li><a href="../../../guide/esp/users/tour.html">ESP Tour</a></li>
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<li><a href="../../../guide/esp/users/template.html">Templates and Layouts</a></li>
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<li><a href="../../../guide/esp/users/controls.html">HTML Controls</a></li>
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<li><a href="../../../guide/esp/users/config.html">ESP Configuration Directives</a></li>
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<li><a href="../../../guide/esp/users/mvc.html">Model-View-Controller</a></li>
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<li><a href="../../../guide/esp/users/generator.html">Application Generator</a></li>
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<li><a href="../../../guide/esp/users/controllers.html">Controllers and Actions</a></li>
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<li><a href="../../../guide/esp/users/database.html">Database Interface</a></li>
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<li><a href="../../../guide/appweb/users/caching.html">Caching Responses</a></li>
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</ul>
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<!-- EndDsi -->
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</div>
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<div class="contentLeft">
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<h1>Model-View-Controller Framework</h1>
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<p>The Model-View-Controller (MVC) paradigm is a design pattern for creating applications. It
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partitions the separate concerns of application data, user interface and application logic into three
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discrete components. It has proven highly successful in simplifying application design and
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maintenance.</p>
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<img src="../../../images/mvc.jpg" alt="mvc" />
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<p>The ESP Web Framework is a Model-View-Controller environment that provides a structure and
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assistance for your MVC application. It provides the basis and connections between your models, views and
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controllers and routes messages between the various components.</p>
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<a id="models"></a>
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<h2>Models</h2>
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<p>The model is responsible for managing access to application data and state. It is also responsible for
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ensuring the data remains valid and consistent.</p>
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<p>ESP provides a basic Object Relational Mapper (ORM) via the Embedded Database Interface (EDI).
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This wraps database data in a "C" language Record and Grid data structure. It then allows you to use
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object-oriented programming (OOP) when dealing with database data stored in rows and columns. </p>
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<a id="views"></a>
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<h2>Views</h2>
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<p>The view is responsible for rendering the user interface and presenting the application to the user.
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Views should not manage incoming requests — that is the job of Controllers.</p>
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<p>ESP provides the ESP web pages to assist in creating view web pages. ESP web pages are HTML
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pages with embedded "C" code. They are compiled and run to render the user interface. The ESP view
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mechanism also provides a templating engine so you can deal separately with layout pages and content pages.</p>
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<a id="controllers"></a>
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<h2>Controllers</h2>
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<p>Controllers manage the application and respond to client requests. They orchestrate the application's
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response, they access and update model data, and display views back to the client. Incoming requests invoke
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<b>Actions</b> in the controller which modify the application state and ultimately render a view.</p>
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<p>ESP routes requests by parsing and decoding request URIs and matching them with the appropriate
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Controller and Action function.</p>
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</div>
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</div>
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<!-- BeginDsi "dsi/bottom.html" -->
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<div class="bottom">
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<p class="footnote">
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<a href="../../../product/copyright.html" >© Embedthis Software LLC, 2003-2013.
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All rights reserved. Embedthis, Appweb, ESP, Ejscript and Embedthis GoAhead are trademarks of Embedthis Software LLC.</a>
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</p>
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</div>
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<script src="http://www.google.com/jsapi" type="text/javascript"></script>
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<script type="text/javascript">
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google.load('search', '1', {language : 'en'});
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google.setOnLoadCallback(function() {
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var customSearchControl = new google.search.CustomSearchControl(
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'000262706376373952077:1hs0lhenihk');
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customSearchControl.setResultSetSize(google.search.Search.FILTERED_CSE_RESULTSET);
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var options = new google.search.DrawOptions();
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options.enableSearchboxOnly("http://appwebserver.org/search.html");
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customSearchControl.draw('cse-search-form', options);
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}, true);
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</script>
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<script type="text/javascript">
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var _gaq = _gaq || [];
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_gaq.push(['_setAccount', 'UA-179169-2']);
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_gaq.push(['_trackPageview']);
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(function() {
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var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
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ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
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var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
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})();
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</script>
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</body>
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</html>
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