<?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="Basics Operations & Concepts|Indexing" MadCap:InPreviewMode="false" MadCap:RuntimeFileType="Topic" MadCap:TargetType="WebHelp" MadCap:PathToHelpSystem="../../../" MadCap:HelpSystemFileName="index.xml" MadCap:SearchType="Stem">
<head><title>Check For Existing Indexes</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#basics/indexing/check_for_index.htm" style="">Open topic with navigation</a>
</p>
<div class="MCBreadcrumbsBox"><span class="MCBreadcrumbsPrefix">You are here: </span><a class="MCBreadcrumbsLink" href="../../basics.htm">Basics Operations & Concepts</a><span class="MCBreadcrumbsDivider"> > </span><a class="MCBreadcrumbsLink" href="../indexing.htm">Indexing</a><span class="MCBreadcrumbsDivider"> > </span><span class="MCBreadcrumbs">Check For Existing Indexes</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>Check For Existing Indexes</h1>
<p>Sometime you may want to know if a index exists on a certain field. You can use the <a href="../../advanced_topics/db4o_meta-information.htm">db4o-meta information</a> to find out if a field is indexed. </p>
<div class="codesnippet" MadCap:conditions="Primary.c#">
<pre class="prettyprint" xml:space="preserve">IStoredClass metaInfo = container.Ext().StoredClass(typeof(IndexedClass));
// list a fields and check if they have a index
foreach (IStoredField field in metaInfo.GetStoredFields())
{
if (field.HasIndex())
{
Console.WriteLine("The field '" + field.GetName() + "' is indexed");
}
else
{
Console.WriteLine("The field '" + field.GetName() + "' isn't indexed");
}
}</pre>
<div class="codesnippet-meta">CheckForAndIndex.cs: Check for a index
<div class="codedownload"><a href="../../CodeExamples/indexing/check/Example-indexing-check-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 metaInfo As IStoredClass = container.Ext().StoredClass(GetType(IndexedClass))
' list a fields and check if they have a index
For Each field As IStoredField In metaInfo.GetStoredFields()
If field.HasIndex() Then
Console.WriteLine("The field '" & field.GetName() & "' is indexed")
Else
Console.WriteLine("The field '" & field.GetName() & "' isn't indexed")
End If</pre>
<div class="codesnippet-meta">CheckForAndIndex.vb: Check for a index
<div class="codedownload"><a href="../../CodeExamples/indexing/check/Example-indexing-check-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>
<script type="text/javascript" src="../../SkinSupport/MadCapBodyEnd.js">
</script>
</body>
</html>
