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<h1>Updating Db4o File Format</h1><script>
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</script><p>The db4o database file format is a subject to change to
allow progress for performance and additional features. <br>
<br>
db4o does not support downgrades back to previous versions of database files. <br>
<br>
In order to prevent accidental upgrades when using different db4o versions or
ObjectManager, db4o does not upgrade databases by default. <br>
<br>
Database upgrading can be turned on with the following configuration switch: </p>
<span name="cs_wiki_filter" csw_filters="cs"><p>c#: </p>
<p><code>Db4oFactory.Configure().AllowVersionUpdates(true)</code></p>
</span><span name="cs_wiki_filter" csw_filters="vb"><p>VB: </p>
<p><code>Db4oFactory.Configure().AllowVersionUpdates(True)</code></p>
</span><p>Please note that, once the database file version is updated, there is no way to
get back to the older version of the database file <br>
<br>
If a database file is opened successfully with the new db4o version, the
upgrade of the file will take place automatically. You can simply upgrade
database files by opening and closing a db4o database once with code like the
following: <br>
</p>
<p><span name="cs_wiki_filter" csw_filters="cs"><br>
<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">UpdateExample.cs</span></div><div class="fscCode"><pre ID="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48"><div><!--
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--><span style="color: #008080;">01</span><img id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_0_67_Open_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_0_67_Open_Text').style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_0_67_Closed_Image').style.display='inline'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_0_67_Closed_Text').style.display='inline';"/><img id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_0_67_Closed_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_0_67_Closed_Text').style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_0_67_Open_Image').style.display='inline'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_0_67_Open_Text').style.display='inline';"/><span id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_0_67_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">/**/</span><span id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_0_67_Open_Text"><span style="color: #008000;">/*</span><span style="color: #008000;"> Copyright (C) 2004 - 2007 db4objects Inc. </span><span style="color: #008000; text-decoration: underline;">http://www.db4o.com</span><span style="color: #008000;"> </span><span style="color: #008000;">*/</span></span><span style="color: #000000;">
</span><span style="color: #008080;">02</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/></span><span style="color: #0000FF;">using</span><span style="color: #000000;"> Db4objects.Db4o;
</span><span style="color: #008080;">03</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/>
</span><span style="color: #008080;">04</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/></span><span style="color: #0000FF;">namespace</span><span style="color: #000000;"> Db4objects.Db4odoc.VersionUpdate
</span><span style="color: #008080;">05</span><span style="color: #000000;"><img id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_135_523_Open_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_135_523_Open_Text').style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_135_523_Closed_Image').style.display='inline'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_135_523_Closed_Text').style.display='inline';"/><img id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_135_523_Closed_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_135_523_Closed_Text').style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_135_523_Open_Image').style.display='inline'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_135_523_Open_Text').style.display='inline';"/></span><span id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_135_523_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_135_523_Open_Text"><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;">class</span><span style="color: #000000;"> UpdateExample
</span><span style="color: #008080;">07</span><span style="color: #000000;"><img id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_165_521_Open_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedSubBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_165_521_Open_Text').style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_165_521_Closed_Image').style.display='inline'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_165_521_Closed_Text').style.display='inline';"/><img id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_165_521_Closed_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedSubBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_165_521_Closed_Text').style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_165_521_Open_Image').style.display='inline'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_165_521_Open_Text').style.display='inline';"/> </span><span id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_165_521_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_165_521_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"/> </span><span style="color: #0000FF;">public</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;"> Main(</span><span style="color: #0000FF;">string</span><span style="color: #000000;">[] args)
</span><span style="color: #008080;">09</span><span style="color: #000000;"><img id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_222_515_Open_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedSubBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_222_515_Open_Text').style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_222_515_Closed_Image').style.display='inline'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_222_515_Closed_Text').style.display='inline';"/><img id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_222_515_Closed_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedSubBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_222_515_Closed_Text').style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_222_515_Open_Image').style.display='inline'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_222_515_Open_Text').style.display='inline';"/> </span><span id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_222_515_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesCS.ZipsUpdateExample.Cs_UpdateExample.Cs_1201_48_222_515_Open_Text"><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"/> Db4oFactory.Configure().AllowVersionUpdates(</span><span style="color: #0000FF;">true</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"/> IObjectContainer objectContainer </span><span style="color: #000000;">=</span><span style="color: #000000;"> Db4oFactory.OpenFile(args[</span><span style="color: #800080;">0</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"/> objectContainer.Close();
</span><span style="color: #008080;">13</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> System.Console.WriteLine(</span><span style="color: #800000;">"</span><span style="color: #800000;">The database is ready for the version </span><span style="color: #800000;">"</span><span style="color: #000000;"> </span><span style="color: #000000;">+</span><span style="color: #000000;"> Db4o.Db4oVersion.NAME);
</span><span style="color: #008080;">14</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;">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>
<p></span></p>
<p><span name="cs_wiki_filter" csw_filters="vb"><br>
<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">UpdateExample.vb</span></div><div class="fscCode"><pre ID="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48"><div><!--
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--><span style="color: #008080;">01</span><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/><span style="color: #008000;">'</span><span style="color: #008000;"> Copyright (C) 2007 db4objects Inc. http:'www.db4o.com </span><span style="color: #008000;">
</span><span style="color: #008080;">02</span><span style="color: #008000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/></span><span style="color: #000000;">
</span><span style="color: #008080;">03</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/></span><span style="color: #0000FF;">Imports</span><span style="color: #000000;"> Db4objects.Db4o
</span><span style="color: #008080;">04</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/>
</span><span style="color: #008080;">05</span><span style="color: #000000;"><img id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_83_541_Open_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_83_541_Open_Text').style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_83_541_Closed_Image').style.display='inline'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_83_541_Closed_Text').style.display='inline';"/><img id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_83_541_Closed_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_83_541_Closed_Text').style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_83_541_Open_Image').style.display='inline'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_83_541_Open_Text').style.display='inline';"/></span><span id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_83_541_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">Namespace Db4objects</span><span id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_83_541_Open_Text"><span style="color: #0000FF;">Namespace</span><span style="color: #000000;"> Db4objects.Db4odoc.VersionUpdate
</span><span style="color: #008080;">06</span><span style="color: #000000;"><img id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_137_527_Open_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedSubBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_137_527_Open_Text').style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_137_527_Closed_Image').style.display='inline'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_137_527_Closed_Text').style.display='inline';"/><img id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_137_527_Closed_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedSubBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_137_527_Closed_Text').style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_137_527_Open_Image').style.display='inline'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_137_527_Open_Text').style.display='inline';"/> </span><span style="color: #0000FF;">Public</span><span style="color: #000000;"> </span><span id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_137_527_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">Class UpdateExample</span><span id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_137_527_Open_Text"><span style="color: #0000FF;">Class</span><span style="color: #000000;"> UpdateExample
</span><span style="color: #008080;">07</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/>
</span><span style="color: #008080;">08</span><span style="color: #000000;"><img id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_180_513_Open_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedSubBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_180_513_Open_Text').style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_180_513_Closed_Image').style.display='inline'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_180_513_Closed_Text').style.display='inline';"/><img id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_180_513_Closed_Image" src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedSubBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_180_513_Closed_Text').style.display='none'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_180_513_Open_Image').style.display='inline'; document.getElementById('ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_180_513_Open_Text').style.display='inline';"/> </span><span style="color: #0000FF;">Public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">Shared</span><span style="color: #000000;"> </span><span id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_180_513_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">Sub Main()</span><span id="ResourcesReferenceImplementation_StrategiesMaintenanceUpdating_Db4o_File_FormatVersionUpdatesVB.ZipsUpdateExample.Vb_UpdateExample.Vb_1325_48_180_513_Open_Text"><span style="color: #0000FF;">Sub</span><span style="color: #000000;"> Main(</span><span style="color: #0000FF;">ByVal</span><span style="color: #000000;"> args </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> </span><span style="color: #0000FF;">String</span><span style="color: #000000;">())
</span><span style="color: #008080;">09</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> Db4oFactory.Configure().AllowVersionUpdates(</span><span style="color: #0000FF;">True</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"/> </span><span style="color: #0000FF;">Dim</span><span style="color: #000000;"> objectContainer </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IObjectContainer </span><span style="color: #000000;">=</span><span style="color: #000000;"> Db4oFactory.OpenFile(args(</span><span style="color: #800080;">0</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"/> objectContainer.Close()
</span><span style="color: #008080;">12</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> System.Console.WriteLine(</span><span style="color: #800000;">"</span><span style="color: #800000;">The database is ready for the version </span><span style="color: #800000;">"</span><span style="color: #000000;"> </span><span style="color: #000000;">+</span><span style="color: #000000;"> Db4o.Db4oVersion.NAME)
</span><span style="color: #008080;">13</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedSubBlockEnd.gif" align="top"/> </span><span style="color: #0000FF;">End Sub</span></span><span style="color: #000000;">
</span><span style="color: #008080;">14</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedSubBlockEnd.gif" align="top"/> </span><span style="color: #0000FF;">End Class</span></span><span style="color: #000000;">
</span><span style="color: #008080;">15</span><span style="color: #000000;"><img src="../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/></span><span style="color: #0000FF;">End Namespace</span></span></div></pre></div></div>
<p></span></p>
Recommendations for upgrading: <br><ul><li>backup your database file to be able to switch back. </li><li>check the content of database files before and after upgrading, using
com.db4o.tools.Statistics. </li><li><a href="defragment.html" class="wikiLink">Defragmenting</a> a database file with the new db4o version
after upgrading can make the database more efficient.
</li></ul><p><font color="#cc0000"></font><br></p></div>
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This revision (4) was last Modified 2007-05-04T14:33:39 by Tetyana.
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