<?xml version="1.0" encoding="utf-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns:MadCap="http://www.madcapsoftware.com/Schemas/MadCap.xsd" MadCap:lastBlockDepth="2" MadCap:lastHeight="120" MadCap:lastWidth="624" MadCap:disableMasterStylesheet="true" MadCap:tocPath="Advanced Features" MadCap:InPreviewMode="false" MadCap:RuntimeFileType="Topic" MadCap:TargetType="WebHelp" MadCap:PathToHelpSystem="../../" MadCap:HelpSystemFileName="index.xml" MadCap:SearchType="Stem"> <head><title>db4o Reflection API</title> <script type="text/javascript">/* <![CDATA[ */ window.onload = function(){ var pathToFlash = $('html').attr('MadCap:PathToHelpSystem') + 'Content/Resources/Code/ZeroClipboard.swf'; ZeroClipboard.setMoviePath(pathToFlash); function bindToClipBord(element,content){ var clip = new ZeroClipboard.Client(); clip.setText(content); clip.glue(element); }; if(location.protocol==='file:'){ $('.copylink-marker').remove(); } else{ $('.copylink-marker').each(function(){ var text = $(this).parent().parent().children('.prettyprint').html(); $(this).hover(function(){ bindToClipBord(this,text); }, function(){}); }); } prettyPrint(); }; /* ]]> */</script> <link href="../SkinSupport/MadCap.css" rel="stylesheet" /> <link href="../Resources/Stylesheets/OnlineStyle.css" rel="stylesheet" /> <script src="../Resources/Code/prettify.js"> </script> <script src="../Resources/Code/lang-vb.js"> </script> <script src="../Resources/Code/jquery.min.js"> </script> <script src="../Resources/Code/ZeroClipboard.js"> </script> <script src="../SkinSupport/MadCapAll.js" type="text/javascript"> </script> </head> <body> <p class="MCWebHelpFramesetLink" style="display: none;"><a href="../../index_CSH.html#advanced_topics/db4o_reflection_api.htm" style="">Open topic with navigation</a> </p> <div class="MCBreadcrumbsBox"><span class="MCBreadcrumbsPrefix">You are here: </span><a class="MCBreadcrumbsLink" href="../advanced_topics.htm">Advanced Features</a><span class="MCBreadcrumbsDivider"> > </span><span class="MCBreadcrumbs">db4o Reflection API</span> </div> <p> <script type="text/javascript">/*<![CDATA[*/document.write('<a href="' + location.href +'">'); document.write("Direct Link"); document.write('</a>');/*]]>*/</script> </p> <p> </p> <h1>db4o <a name="kanchor98"></a>Reflection API</h1> <P>Reflection gives your code access to internal information for classes loaded into the <span class="PrimaryJVM">CLR</span>. It allows you to explore the structure of objects at runtime. In the case of reflection metadata is the description of classes and objects within the <span class="PrimaryJVM">CLR</span>, including their fields, methods and constructors. It allows the programmer to select target classes at runtime, create new objects, call their methods and operate with the fields.</P> <P>In order to persist object db4o uses the reflection to read object and store their values. You can exchange this reflector layer in the <a href="../configuration/common/reflector.htm">configuration</a>. </P> <div class="codesnippet" MadCap:conditions="Primary.c#"> <pre class="prettyprint" xml:space="preserve">IEmbeddedConfiguration configuration = Db4oEmbedded.NewConfiguration(); configuration.Common.ReflectWith(new FastNetReflector());</pre> <div class="codesnippet-meta">CommonConfigurationExamples.cs: Change the reflector <div class="codedownload"><a href="../CodeExamples/configuration/common/Example-configuration-common-csharp.zip" class="codedownload" MadCap:conditions="Primary.Online">Download Code</a></div><div class="codedownload copylink-marker" MadCap:conditions="Primary.Online"><a href="#copy">Copy Code</a></div></div> </div> <div class="codesnippet" MadCap:conditions="Primary.VB.NET"> <pre class="prettyprint lang-vb" MadCap:conditions="Primary.Online" xml:space="preserve">Dim configuration As IEmbeddedConfiguration = Db4oEmbedded.NewConfiguration() configuration.Common.ReflectWith(New FastNetReflector())</pre> <div class="codesnippet-meta">CommonConfigurationExamples.vb: Change the reflector <div class="codedownload"><a href="../CodeExamples/configuration/common/Example-configuration-common-vb.zip" class="codedownload" MadCap:conditions="Primary.Online">Download Code</a></div><div class="codedownload copylink-marker" MadCap:conditions="Primary.Online"><a href="#copy">Copy Code</a></div></div> </div> <p MadCap:conditions="Primary..NET">There are currently two reflectors available:</p> <ul MadCap:conditions="Primary..NET"> <li MadCap:conditions="Primary..NET" value="1"><strong>NetReflector</strong>: The default reflector which uses standard .NET reflection for inspecting and accessing objects.</li> <li value="2"><strong>FastNetReflector</strong>: A reflector which generates special access-code for each class. Therefore it is a lot faster than the default NetReflector. However it has a higher memory-consumption due to the generated code.</li> </ul> <p>If you need some special treatment you can create you're own reflector implementation. <a href="db4o_reflection_api/creating_your_own_reflector.htm" target="" title="" alt="" class="MCXref" xrefformat="See "{paratext}"">See "Creating your own reflector"</a></p> <p>db4o has also a generic reflector which can deal with stored objects without using the original class. <a href="db4o_reflection_api/genericreflector.htm" target="" title="" alt="" class="MCXref" xrefformat="See "{paratext}"">See "GenericReflector"</a></p> <script type="text/javascript" src="../SkinSupport/MadCapBodyEnd.js"> </script> </body> </html>