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<h1>Generate UUIDs</h1>
<p>db4o can generate UUIDs for each stored object. These UUIDs are mainly used for <a href="../../drs_stub.htm">replication</a> <![CDATA[ ]]>together with <a href="generate_timestamps.htm">commit timestamps</a>. Of course it can be used also for other purposes.</p>
<h2>Enable UUIDs for all objects.</h2>
<p>You can enable UUIDs for all objects. Set the global scope on the UUID setting.</p>
<div class="codesnippet" MadCap:conditions="Primary.c#">
<pre class="prettyprint" xml:space="preserve">IEmbeddedConfiguration configuration = Db4oEmbedded.NewConfiguration();
configuration.File.GenerateUUIDs = ConfigScope.Globally;</pre>
<div class="codesnippet-meta">FileConfiguration.cs: Enable db4o uuids globally
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<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.File.GenerateUUIDs = ConfigScope.Globally</pre>
<div class="codesnippet-meta">FileConfiguration.vb: Enable db4o uuids globally
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<h2>Enable UUIDs for certain classes</h2>
<p>You can also enable uuids only for certain classes:</p>
<div class="codesnippet" MadCap:conditions="Primary.c#">
<pre class="prettyprint" xml:space="preserve">IEmbeddedConfiguration configuration = Db4oEmbedded.NewConfiguration();
configuration.File.GenerateUUIDs = ConfigScope.Individually;
configuration.Common.ObjectClass(typeof (SpecialClass)).GenerateUUIDs(true);</pre>
<div class="codesnippet-meta">FileConfiguration.cs: Enable db4o uuids for certain classes
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<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.File.GenerateUUIDs = ConfigScope.Individually
configuration.Common.ObjectClass(GetType(SpecialClass)).GenerateUUIDs(True)</pre>
<div class="codesnippet-meta">FileConfiguration.vb: Enable db4o uuids for certain classes
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