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<h1><a name="kanchor61"></a>Embedded Client Server</h1>
<p>db4o supports embedded containers or session container. It's a separate object-container with its own transaction and own reference cache. <a href="../advanced_topics/session_containers.htm" target="" title="" alt="" class="MCXref" xrefformat="See "{paratext}"">See "Session Containers"</a></p>
<p>Now if you're using the client-server mode for db4o, you also can create such sessions directly from the server. When you pass a 0 to the open server method, the server only supports embedded clients. With any other port you can connect with <a href="../client-server.htm">regular clients</a> and also create embedded clients.</p>
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<pre class="prettyprint" xml:space="preserve">using (IObjectServer server = Db4oClientServer.OpenServer(DatabaseFileName, 0))
{
// open the db4o-embedded client. For example at the beginning for a web-request
using (IObjectContainer container = server.OpenClient())
{
// do the operations on the session-container
container.Store(new Person("Joe"));
}
}</pre>
<div class="codesnippet-meta">Db4oSessions.cs: Embedded client
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<pre class="prettyprint lang-vb" MadCap:conditions="Primary.Online" xml:space="preserve">Using server As IObjectServer = Db4oClientServer.OpenServer(DatabaseFileName, 0)
' open the db4o-embedded client. For example at the beginning for a web-request
Using container As IObjectContainer = server.OpenClient()
' do the operations on the session-container
container.Store(New Person("Joe"))
End Using
End Using</pre>
<div class="codesnippet-meta">Db4oSessions.vb: Embedded client
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<h2>OpenSession On A Client</h2>
<p>You might noted that the open-session is available on any object-container. Normally this creates a <a href="../advanced_topics/session_containers.htm">session-container</a> with its own transaction and reference cache. However on a db4o-client this is not true. There it only creates a container with new cache, but shares the transaction with the client. The only use case for this is to implement connection pooling.<a href="pooling.htm" target="" title="" alt="" class="MCXref" xrefformat="See "{paratext}"">See "Client-Container Pooling"</a></p>
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