<html>
<head>
<META http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Class Mapping</title>
<link rel="stylesheet" type="text/css" href="../../style.css">
</head>
<body>
<div class="CommonContent">
<div class="CommonContentArea">
<h1>Class Mapping</h1><script>
//We attach this function to a browser object as a variable so that if multiple of these blocks are
//present on the same page, then they will simply over-write eachother with the same function instead
//of generating a naming collision.
window.WikiCodeFormattingCopyToClipboard = function copyToClipboard(sID){
var sContent = document.getElementById(sID).innerText;
if( window.clipboardData && clipboardData.setData )
{
clipboardData.setData("Text", sContent);
}
else
{
alert("You must enable javascript access to your clipboard for this feature to work. Please referr to your browser documentation or Google search for instructions.");
}
}
</script><p>[This functionality is deprecated] </p><p>db4o provides you with a possibility to create a mapping
from a class in the database to a runtime class. </p>
<span name="cs_wiki_filter" csw_filters="cs"><p>c#: </p>
<p><code>IObjectClass.ReadAs(object clazz)</code></p>
</span>
<span name="cs_wiki_filter" csw_filters="vb"><p>VB: </p>
<p><code>IObjectClass.ReadAs(Type clazz)</code></p>
</span>
<p><code>clazz</code> parameter specifies a runtime class,
which will be used to instantiate objects from the database.</p>
<p>The use-case is the following:</p>
<ul><li>objects of class A are stored to the database;</li><li>the objects should be retrieved from the database and
instantiated as objects of class B.</li></ul>
<span name="cs_wiki_filter" csw_filters="cs"><p>c#: </p>
<p><code>Db4oFactory.Configure().ObjectClass(typeof(A)).readAs(typeof(B))
</code></p>
</span>
<span name="cs_wiki_filter" csw_filters="vb"><p>VB: </p>
<p><code>IObjectClass.ReadAs(Type clazz)</code></p>
</span>
<p>This configuration should be set before opening a database
file.</p>
<p>The mapping functionality is similar to <a href="aliases.html" class="wikiLink">Aliases</a>, but
more limited.</p>
<p>Let's look at an example.</p>
<p>We will use 2 identical classes <a href="class_mapping/pilot.html" class="wikiLink">Pilot</a> and
<a href="class_mapping/pilotreplacement.html" class="wikiLink">PilotReplacement</a>.</p>
<p>Objects of Pilot class will be saved to the database:</p>
<span name="cs_wiki_filter" csw_filters="cs">
<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">MappingExample.cs: <span class="fscMemberName">StoreObjects</span></span></div><div class="fscCode"><pre ID=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65"><div><!--
Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/
--><span style="color: #008080;">01</span><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/><span style="color: #0000FF;">private</span><span style="color: #000000;"> </span><span style="color: #0000FF;">static</span><span style="color: #000000;"> </span><span style="color: #0000FF;">void</span><span style="color: #000000;"> StoreObjects()
</span><span style="color: #008080;">02</span><span style="color: #000000;"><img id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_43_501_Open_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_43_501_Open_Text').style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_43_501_Closed_Image').style.display='inline'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_43_501_Closed_Text').style.display='inline';"/><img id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_43_501_Closed_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_43_501_Closed_Text').style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_43_501_Open_Image').style.display='inline'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_43_501_Open_Text').style.display='inline';"/> </span><span id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_43_501_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_43_501_Open_Text"><span style="color: #000000;">{
</span><span style="color: #008080;">03</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> File.Delete(Db4oFileName);
</span><span style="color: #008080;">04</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> IObjectContainer container </span><span style="color: #000000;">=</span><span style="color: #000000;"> Db4oFactory.OpenFile(Db4oFileName);
</span><span style="color: #008080;">05</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">try</span><span style="color: #000000;">
</span><span style="color: #008080;">06</span><span style="color: #000000;"><img id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_189_408_Open_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedSubBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_189_408_Open_Text').style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_189_408_Closed_Image').style.display='inline'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_189_408_Closed_Text').style.display='inline';"/><img id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_189_408_Closed_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedSubBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_189_408_Closed_Text').style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_189_408_Open_Image').style.display='inline'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_189_408_Open_Text').style.display='inline';"/> </span><span id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_189_408_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_189_408_Open_Text"><span style="color: #000000;">{
</span><span style="color: #008080;">07</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> Pilot pilot </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">new</span><span style="color: #000000;"> Pilot(</span><span style="color: #800000;">"</span><span style="color: #800000;">Michael Schumacher</span><span style="color: #800000;">"</span><span style="color: #000000;">, </span><span style="color: #800080;">100</span><span style="color: #000000;">);
</span><span style="color: #008080;">08</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> container.Set(pilot);
</span><span style="color: #008080;">09</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> pilot </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">new</span><span style="color: #000000;"> Pilot(</span><span style="color: #800000;">"</span><span style="color: #800000;">Rubens Barichello</span><span style="color: #800000;">"</span><span style="color: #000000;">, </span><span style="color: #800080;">99</span><span style="color: #000000;">);
</span><span style="color: #008080;">10</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> container.Set(pilot);
</span><span style="color: #008080;">11</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedSubBlockEnd.gif" align="top"/> }</span></span><span style="color: #000000;">
</span><span style="color: #008080;">12</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">finally</span><span style="color: #000000;">
</span><span style="color: #008080;">13</span><span style="color: #000000;"><img id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_441_491_Open_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedSubBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_441_491_Open_Text').style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_441_491_Closed_Image').style.display='inline'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_441_491_Closed_Text').style.display='inline';"/><img id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_441_491_Closed_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedSubBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_441_491_Closed_Text').style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_441_491_Open_Image').style.display='inline'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_441_491_Open_Text').style.display='inline';"/> </span><span id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_441_491_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_StoreObjects_1479_65_441_491_Open_Text"><span style="color: #000000;">{
</span><span style="color: #008080;">14</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> container.Close();
</span><span style="color: #008080;">15</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedSubBlockEnd.gif" align="top"/> }</span></span><span style="color: #000000;">
</span><span style="color: #008080;">16</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/> }</span></span></div></pre></div></div>
</span>
<span name="cs_wiki_filter" csw_filters="vb">
<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">MappingExample.vb: <span class="fscMemberName">StoreObjects</span></span></div><div class="fscCode"><pre ID=".ClassMappingVB.ZipsMappingExample.Vb_MappingExample.Vb_StoreObjects_1608_65"><div><!--
Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/
--><span style="color: #008080;">01</span><img id=".ClassMappingVB.ZipsMappingExample.Vb_MappingExample.Vb_StoreObjects_1608_65_15_467_Open_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('.ClassMappingVB.ZipsMappingExample.Vb_MappingExample.Vb_StoreObjects_1608_65_15_467_Open_Text').style.display='none'; document.getElementById('.ClassMappingVB.ZipsMappingExample.Vb_MappingExample.Vb_StoreObjects_1608_65_15_467_Closed_Image').style.display='inline'; document.getElementById('.ClassMappingVB.ZipsMappingExample.Vb_MappingExample.Vb_StoreObjects_1608_65_15_467_Closed_Text').style.display='inline';"/><img id=".ClassMappingVB.ZipsMappingExample.Vb_MappingExample.Vb_StoreObjects_1608_65_15_467_Closed_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('.ClassMappingVB.ZipsMappingExample.Vb_MappingExample.Vb_StoreObjects_1608_65_15_467_Closed_Text').style.display='none'; document.getElementById('.ClassMappingVB.ZipsMappingExample.Vb_MappingExample.Vb_StoreObjects_1608_65_15_467_Open_Image').style.display='inline'; document.getElementById('.ClassMappingVB.ZipsMappingExample.Vb_MappingExample.Vb_StoreObjects_1608_65_15_467_Open_Text').style.display='inline';"/><span style="color: #0000FF;">Private</span><span style="color: #000000;"> </span><span style="color: #0000FF;">Shared</span><span style="color: #000000;"> </span><span id=".ClassMappingVB.ZipsMappingExample.Vb_MappingExample.Vb_StoreObjects_1608_65_15_467_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">Sub StoreObjects()</span><span id=".ClassMappingVB.ZipsMappingExample.Vb_MappingExample.Vb_StoreObjects_1608_65_15_467_Open_Text"><span style="color: #0000FF;">Sub</span><span style="color: #000000;"> StoreObjects()
</span><span style="color: #008080;">02</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> File.Delete(Db4oFileName)
</span><span style="color: #008080;">03</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">Dim</span><span style="color: #000000;"> container </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IObjectContainer </span><span style="color: #000000;">=</span><span style="color: #000000;"> Db4oFactory.OpenFile(Db4oFileName)
</span><span style="color: #008080;">04</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">Try</span><span style="color: #000000;">
</span><span style="color: #008080;">05</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">Dim</span><span style="color: #000000;"> pilot </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> Pilot </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">New</span><span style="color: #000000;"> Pilot(</span><span style="color: #800000;">"</span><span style="color: #800000;">Michael Schumacher</span><span style="color: #800000;">"</span><span style="color: #000000;">, </span><span style="color: #800080;">100</span><span style="color: #000000;">)
</span><span style="color: #008080;">06</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> container.Set(pilot)
</span><span style="color: #008080;">07</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> pilot </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">New</span><span style="color: #000000;"> Pilot(</span><span style="color: #800000;">"</span><span style="color: #800000;">Rubens Barichello</span><span style="color: #800000;">"</span><span style="color: #000000;">, </span><span style="color: #800080;">99</span><span style="color: #000000;">)
</span><span style="color: #008080;">08</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> container.Set(pilot)
</span><span style="color: #008080;">09</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">Finally</span><span style="color: #000000;">
</span><span style="color: #008080;">10</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> container.Close()
</span><span style="color: #008080;">11</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">End</span><span style="color: #000000;"> </span><span style="color: #0000FF;">Try</span><span style="color: #000000;">
</span><span style="color: #008080;">12</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/> </span><span style="color: #0000FF;">End Sub</span></span></div></pre></div></div>
</span>
<p>Let's try to retrieve the persisted objects using
PilotReplacement class:</p>
<span name="cs_wiki_filter" csw_filters="cs">
<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">MappingExample.cs: <span class="fscMemberName">RetrieveObjects</span></span></div><div class="fscCode"><pre ID=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68"><div><!--
Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/
--><span style="color: #008080;">01</span><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/><span style="color: #0000FF;">private</span><span style="color: #000000;"> </span><span style="color: #0000FF;">static</span><span style="color: #000000;"> </span><span style="color: #0000FF;">void</span><span style="color: #000000;"> RetrieveObjects()
</span><span style="color: #008080;">02</span><span style="color: #000000;"><img id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_46_636_Open_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_46_636_Open_Text').style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_46_636_Closed_Image').style.display='inline'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_46_636_Closed_Text').style.display='inline';"/><img id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_46_636_Closed_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_46_636_Closed_Text').style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_46_636_Open_Image').style.display='inline'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_46_636_Open_Text').style.display='inline';"/> </span><span id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_46_636_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_46_636_Open_Text"><span style="color: #000000;">{
</span><span style="color: #008080;">03</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> IConfiguration configuration </span><span style="color: #000000;">=</span><span style="color: #000000;"> Db4oFactory.NewConfiguration();
</span><span style="color: #008080;">04</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> configuration.ObjectClass(</span><span style="color: #0000FF;">typeof</span><span style="color: #000000;">(Pilot)).ReadAs(</span><span style="color: #0000FF;">typeof</span><span style="color: #000000;">(PilotReplacement));
</span><span style="color: #008080;">05</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> IObjectContainer container </span><span style="color: #000000;">=</span><span style="color: #000000;"> Db4oFactory.OpenFile(configuration, Db4oFileName);
</span><span style="color: #008080;">06</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">try</span><span style="color: #000000;">
</span><span style="color: #008080;">07</span><span style="color: #000000;"><img id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_330_543_Open_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedSubBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_330_543_Open_Text').style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_330_543_Closed_Image').style.display='inline'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_330_543_Closed_Text').style.display='inline';"/><img id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_330_543_Closed_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedSubBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_330_543_Closed_Text').style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_330_543_Open_Image').style.display='inline'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_330_543_Open_Text').style.display='inline';"/> </span><span id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_330_543_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_330_543_Open_Text"><span style="color: #000000;">{
</span><span style="color: #008080;">08</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> IQuery query </span><span style="color: #000000;">=</span><span style="color: #000000;"> container.Query();
</span><span style="color: #008080;">09</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> query.Constrain(</span><span style="color: #0000FF;">typeof</span><span style="color: #000000;">(PilotReplacement));
</span><span style="color: #008080;">10</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> IObjectSet result </span><span style="color: #000000;">=</span><span style="color: #000000;"> query.Execute();
</span><span style="color: #008080;">11</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> ListResult(result);
</span><span style="color: #008080;">12</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedSubBlockEnd.gif" align="top"/> }</span></span><span style="color: #000000;">
</span><span style="color: #008080;">13</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">finally</span><span style="color: #000000;">
</span><span style="color: #008080;">14</span><span style="color: #000000;"><img id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_576_626_Open_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedSubBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_576_626_Open_Text').style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_576_626_Closed_Image').style.display='inline'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_576_626_Closed_Text').style.display='inline';"/><img id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_576_626_Closed_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedSubBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_576_626_Closed_Text').style.display='none'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_576_626_Open_Image').style.display='inline'; document.getElementById('.ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_576_626_Open_Text').style.display='inline';"/> </span><span id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_576_626_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id=".ClassMappingCS.ZipsMappingExample.Cs_MappingExample.Cs_RetrieveObjects_1826_68_576_626_Open_Text"><span style="color: #000000;">{
</span><span style="color: #008080;">15</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> container.Close();
</span><span style="color: #008080;">16</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedSubBlockEnd.gif" align="top"/> }</span></span><span style="color: #000000;">
</span><span style="color: #008080;">17</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/> }</span></span></div></pre></div></div>
</span>
<span name="cs_wiki_filter" csw_filters="vb">
<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">MappingExample.vb: <span class="fscMemberName">RetrieveObjects</span></span></div><div class="fscCode"><pre ID=".ClassMappingVB.ZipsMappingExample.Vb_MappingExample.Vb_RetrieveObjects_1958_68"><div><!--
Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/
--><span style="color: #008080;">01</span><img id=".ClassMappingVB.ZipsMappingExample.Vb_MappingExample.Vb_RetrieveObjects_1958_68_15_581_Open_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('.ClassMappingVB.ZipsMappingExample.Vb_MappingExample.Vb_RetrieveObjects_1958_68_15_581_Open_Text').style.display='none'; document.getElementById('.ClassMappingVB.ZipsMappingExample.Vb_MappingExample.Vb_RetrieveObjects_1958_68_15_581_Closed_Image').style.display='inline'; document.getElementById('.ClassMappingVB.ZipsMappingExample.Vb_MappingExample.Vb_RetrieveObjects_1958_68_15_581_Closed_Text').style.display='inline';"/><img id=".ClassMappingVB.ZipsMappingExample.Vb_MappingExample.Vb_RetrieveObjects_1958_68_15_581_Closed_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('.ClassMappingVB.ZipsMappingExample.Vb_MappingExample.Vb_RetrieveObjects_1958_68_15_581_Closed_Text').style.display='none'; document.getElementById('.ClassMappingVB.ZipsMappingExample.Vb_MappingExample.Vb_RetrieveObjects_1958_68_15_581_Open_Image').style.display='inline'; document.getElementById('.ClassMappingVB.ZipsMappingExample.Vb_MappingExample.Vb_RetrieveObjects_1958_68_15_581_Open_Text').style.display='inline';"/><span style="color: #0000FF;">Private</span><span style="color: #000000;"> </span><span style="color: #0000FF;">Shared</span><span style="color: #000000;"> </span><span id=".ClassMappingVB.ZipsMappingExample.Vb_MappingExample.Vb_RetrieveObjects_1958_68_15_581_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">Sub RetrieveObjects()</span><span id=".ClassMappingVB.ZipsMappingExample.Vb_MappingExample.Vb_RetrieveObjects_1958_68_15_581_Open_Text"><span style="color: #0000FF;">Sub</span><span style="color: #000000;"> RetrieveObjects()
</span><span style="color: #008080;">02</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">Dim</span><span style="color: #000000;"> configuration </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IConfiguration
</span><span style="color: #008080;">03</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> configuration.ObjectClass(</span><span style="color: #0000FF;">GetType</span><span style="color: #000000;">(Pilot)).ReadAs(</span><span style="color: #0000FF;">GetType</span><span style="color: #000000;">(PilotReplacement))
</span><span style="color: #008080;">04</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">Dim</span><span style="color: #000000;"> container </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IObjectContainer </span><span style="color: #000000;">=</span><span style="color: #000000;"> Db4oFactory.OpenFile(configuration, Db4oFileName)
</span><span style="color: #008080;">05</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">Try</span><span style="color: #000000;">
</span><span style="color: #008080;">06</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">Dim</span><span style="color: #000000;"> query </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IQuery </span><span style="color: #000000;">=</span><span style="color: #000000;"> container.Query
</span><span style="color: #008080;">07</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> query.Constrain(</span><span style="color: #0000FF;">GetType</span><span style="color: #000000;">(PilotReplacement))
</span><span style="color: #008080;">08</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">Dim</span><span style="color: #000000;"> result </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IObjectSet </span><span style="color: #000000;">=</span><span style="color: #000000;"> query.Execute
</span><span style="color: #008080;">09</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> ListResult(result)
</span><span style="color: #008080;">10</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">Finally</span><span style="color: #000000;">
</span><span style="color: #008080;">11</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> container.Close()
</span><span style="color: #008080;">12</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> </span><span style="color: #0000FF;">End</span><span style="color: #000000;"> </span><span style="color: #0000FF;">Try</span><span style="color: #000000;">
</span><span style="color: #008080;">13</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/> </span><span style="color: #0000FF;">End Sub</span></span></div></pre></div></div>
</span>
<p>If meta information
for this mapping class has been stored before to the database file,
<code>readAs</code> method will have no effect.</p>
</div>
</div>
<div id="footer">
This revision (5) was last Modified 2007-05-07T12:36:22 by Tetyana.
</div>
</body>
</html>
