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<h1>Transaction</h1><div id="TOC"><div id="TOCinner"><span class="TOCtitle">Contents</span><div class="TOCcontents"><ul><li><a href ="#Commit And Rollback">Commit And Rollback</a></li><li><a href ="#Refresh Live Objects">Refresh Live Objects</a></li></ul></li></ul></div></div></div><script>
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<p>All work within db4o ObjectContainer is transactional. A transaction is implicitly started when you open a container, and the current transaction is implicitly committed when you close it again. db4o transaction is tied to an open object container and only one transaction is allowed per object container instance.<br></p>
<a name="Commit And Rollback"></a><h2>Commit And Rollback</h2>
<p>You may choose to make a commit explicit or you may leave it for the <code>#close()</code> call:</p>
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<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">TransactionExample.cs: <span class="fscMemberName">StoreCarCommit</span></span></div><div class="fscCode"><pre ID=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_StoreCarCommit_529_71"><div><!--
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--><span style="color: #008080;">1</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;"> StoreCarCommit(IObjectContainer db)
</span><span style="color: #008080;">2</span><span style="color: #000000;"><img id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_StoreCarCommit_529_71_64_257_Open_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_StoreCarCommit_529_71_64_257_Open_Text').style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_StoreCarCommit_529_71_64_257_Closed_Image').style.display='inline'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_StoreCarCommit_529_71_64_257_Closed_Text').style.display='inline';"/><img id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_StoreCarCommit_529_71_64_257_Closed_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_StoreCarCommit_529_71_64_257_Closed_Text').style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_StoreCarCommit_529_71_64_257_Open_Image').style.display='inline'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_StoreCarCommit_529_71_64_257_Open_Text').style.display='inline';"/> </span><span id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_StoreCarCommit_529_71_64_257_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_StoreCarCommit_529_71_64_257_Open_Text"><span style="color: #000000;">{
</span><span style="color: #008080;">3</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;">Rubens Barrichello</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;">4</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> Car car </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">new</span><span style="color: #000000;"> Car(</span><span style="color: #800000;">"</span><span style="color: #800000;">BMW</span><span style="color: #800000;">"</span><span style="color: #000000;">);
</span><span style="color: #008080;">5</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> car.Pilot </span><span style="color: #000000;">=</span><span style="color: #000000;"> pilot;
</span><span style="color: #008080;">6</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> db.Set(car);
</span><span style="color: #008080;">7</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> db.Commit();
</span><span style="color: #008080;">8</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/> }</span></span></div></pre></div></div>
<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">TransactionExample.cs: <span class="fscMemberName">ListAllCars</span></span></div><div class="fscCode"><pre ID=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_ListAllCars_602_68"><div><!--
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--><span style="color: #008080;">1</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;"> ListAllCars(IObjectContainer db)
</span><span style="color: #008080;">2</span><span style="color: #000000;"><img id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_ListAllCars_602_68_61_157_Open_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_ListAllCars_602_68_61_157_Open_Text').style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_ListAllCars_602_68_61_157_Closed_Image').style.display='inline'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_ListAllCars_602_68_61_157_Closed_Text').style.display='inline';"/><img id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_ListAllCars_602_68_61_157_Closed_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_ListAllCars_602_68_61_157_Closed_Text').style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_ListAllCars_602_68_61_157_Open_Image').style.display='inline'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_ListAllCars_602_68_61_157_Open_Text').style.display='inline';"/> </span><span id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_ListAllCars_602_68_61_157_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_ListAllCars_602_68_61_157_Open_Text"><span style="color: #000000;">{
</span><span style="color: #008080;">3</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;"> db.Get(</span><span style="color: #0000FF;">typeof</span><span style="color: #000000;">(Car));
</span><span style="color: #008080;">4</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> ListResult(result);
</span><span style="color: #008080;">5</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/> }</span></span></div></pre></div></div>
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<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">TransactionExample.vb: <span class="fscMemberName">StoreCarCommit</span></span></div><div class="fscCode"><pre ID=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_StoreCarCommit_734_67"><div><!--
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--><span style="color: #008080;">1</span><img id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_StoreCarCommit_734_67_14_269_Open_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_StoreCarCommit_734_67_14_269_Open_Text').style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_StoreCarCommit_734_67_14_269_Closed_Image').style.display='inline'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_StoreCarCommit_734_67_14_269_Closed_Text').style.display='inline';"/><img id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_StoreCarCommit_734_67_14_269_Closed_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_StoreCarCommit_734_67_14_269_Closed_Text').style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_StoreCarCommit_734_67_14_269_Open_Image').style.display='inline'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_StoreCarCommit_734_67_14_269_Open_Text').style.display='inline';"/><span style="color: #0000FF;">Public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">Shared</span><span style="color: #000000;"> </span><span id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_StoreCarCommit_734_67_14_269_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">Sub StoreCarCommit()</span><span id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_StoreCarCommit_734_67_14_269_Open_Text"><span style="color: #0000FF;">Sub</span><span style="color: #000000;"> StoreCarCommit(</span><span style="color: #0000FF;">ByVal</span><span style="color: #000000;"> db </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IObjectContainer)
</span><span style="color: #008080;">2</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;">Rubens Barrichello</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;">3</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;"> car </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> Car </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">New</span><span style="color: #000000;"> Car(</span><span style="color: #800000;">"</span><span style="color: #800000;">BMW</span><span style="color: #800000;">"</span><span style="color: #000000;">)
</span><span style="color: #008080;">4</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> car.Pilot </span><span style="color: #000000;">=</span><span style="color: #000000;"> pilot
</span><span style="color: #008080;">5</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> db.Set(car)
</span><span style="color: #008080;">6</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> db.Commit()
</span><span style="color: #008080;">7</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><br><div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">TransactionExample.vb: <span class="fscMemberName">ListAllCars</span></span></div><div class="fscCode"><pre ID=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_ListAllCars_805_65"><div><!--
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--><span style="color: #008080;">1</span><img id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_ListAllCars_805_65_14_166_Open_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_ListAllCars_805_65_14_166_Open_Text').style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_ListAllCars_805_65_14_166_Closed_Image').style.display='inline'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_ListAllCars_805_65_14_166_Closed_Text').style.display='inline';"/><img id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_ListAllCars_805_65_14_166_Closed_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_ListAllCars_805_65_14_166_Closed_Text').style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_ListAllCars_805_65_14_166_Open_Image').style.display='inline'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_ListAllCars_805_65_14_166_Open_Text').style.display='inline';"/><span style="color: #0000FF;">Public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">Shared</span><span style="color: #000000;"> </span><span id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_ListAllCars_805_65_14_166_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">Sub ListAllCars()</span><span id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_ListAllCars_805_65_14_166_Open_Text"><span style="color: #0000FF;">Sub</span><span style="color: #000000;"> ListAllCars(</span><span style="color: #0000FF;">ByVal</span><span style="color: #000000;"> db </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IObjectContainer)
</span><span style="color: #008080;">2</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;"> db.Get(</span><span style="color: #0000FF;">GetType</span><span style="color: #000000;">(Car))
</span><span style="color: #008080;">3</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> ListResult(result)
</span><span style="color: #008080;">4</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>
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<p>Before transaction is commited all the modifications to a database are written to a temporary memory storage. Commit (explicit or implicit) writes the modifications to the disk.</p>
<p>Please, remember to always commit or close your ObjectContainer when the work is done, to make sure that the data is saved to the permanent storage. <a href="../tuning/performance_hints/commit_strategies.html" class="wikiLink">Commit Strategies</a> contains some important information on when and how commit should be used to achieve the best performance.<br></p>
<p>If you do not want to save changes to the database, you can call rollback, resetting the state of our database to the last commit point.</p>
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<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">TransactionExample.cs: <span class="fscMemberName">StoreCarRollback</span></span></div><div class="fscCode"><pre ID=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_StoreCarRollback_1601_69"><div><!--
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--><span style="color: #008080;">1</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;"> StoreCarRollback(IObjectContainer db)
</span><span style="color: #008080;">2</span><span style="color: #000000;"><img id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_StoreCarRollback_1601_69_66_266_Open_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_StoreCarRollback_1601_69_66_266_Open_Text').style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_StoreCarRollback_1601_69_66_266_Closed_Image').style.display='inline'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_StoreCarRollback_1601_69_66_266_Closed_Text').style.display='inline';"/><img id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_StoreCarRollback_1601_69_66_266_Closed_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_StoreCarRollback_1601_69_66_266_Closed_Text').style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_StoreCarRollback_1601_69_66_266_Open_Image').style.display='inline'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_StoreCarRollback_1601_69_66_266_Open_Text').style.display='inline';"/> </span><span id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_StoreCarRollback_1601_69_66_266_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_StoreCarRollback_1601_69_66_266_Open_Text"><span style="color: #000000;">{
</span><span style="color: #008080;">3</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;">4</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> Car car </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">new</span><span style="color: #000000;"> Car(</span><span style="color: #800000;">"</span><span style="color: #800000;">Ferrari</span><span style="color: #800000;">"</span><span style="color: #000000;">);
</span><span style="color: #008080;">5</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> car.Pilot </span><span style="color: #000000;">=</span><span style="color: #000000;"> pilot;
</span><span style="color: #008080;">6</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> db.Set(car);
</span><span style="color: #008080;">7</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> db.Rollback();
</span><span style="color: #008080;">8</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/> }</span></span></div></pre></div></div><br><div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">TransactionExample.cs: <span class="fscMemberName">ListAllCars</span></span></div><div class="fscCode"><pre ID=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_ListAllCars_1674_65"><div><!--
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--><span style="color: #008080;">1</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;"> ListAllCars(IObjectContainer db)
</span><span style="color: #008080;">2</span><span style="color: #000000;"><img id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_ListAllCars_1674_65_61_157_Open_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_ListAllCars_1674_65_61_157_Open_Text').style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_ListAllCars_1674_65_61_157_Closed_Image').style.display='inline'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_ListAllCars_1674_65_61_157_Closed_Text').style.display='inline';"/><img id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_ListAllCars_1674_65_61_157_Closed_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_ListAllCars_1674_65_61_157_Closed_Text').style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_ListAllCars_1674_65_61_157_Open_Image').style.display='inline'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_ListAllCars_1674_65_61_157_Open_Text').style.display='inline';"/> </span><span id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_ListAllCars_1674_65_61_157_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_ListAllCars_1674_65_61_157_Open_Text"><span style="color: #000000;">{
</span><span style="color: #008080;">3</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;"> db.Get(</span><span style="color: #0000FF;">typeof</span><span style="color: #000000;">(Car));
</span><span style="color: #008080;">4</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> ListResult(result);
</span><span style="color: #008080;">5</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/> }</span></span></div></pre></div></div>
</span>
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<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">TransactionExample.vb: <span class="fscMemberName">StoreCarRollback</span></span></div><div class="fscCode"><pre ID=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_StoreCarRollback_1803_69"><div><!--
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--><span style="color: #008080;">1</span><img id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_StoreCarRollback_1803_69_14_278_Open_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_StoreCarRollback_1803_69_14_278_Open_Text').style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_StoreCarRollback_1803_69_14_278_Closed_Image').style.display='inline'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_StoreCarRollback_1803_69_14_278_Closed_Text').style.display='inline';"/><img id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_StoreCarRollback_1803_69_14_278_Closed_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_StoreCarRollback_1803_69_14_278_Closed_Text').style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_StoreCarRollback_1803_69_14_278_Open_Image').style.display='inline'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_StoreCarRollback_1803_69_14_278_Open_Text').style.display='inline';"/><span style="color: #0000FF;">Public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">Shared</span><span style="color: #000000;"> </span><span id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_StoreCarRollback_1803_69_14_278_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">Sub StoreCarRollback()</span><span id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_StoreCarRollback_1803_69_14_278_Open_Text"><span style="color: #0000FF;">Sub</span><span style="color: #000000;"> StoreCarRollback(</span><span style="color: #0000FF;">ByVal</span><span style="color: #000000;"> db </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IObjectContainer)
</span><span style="color: #008080;">2</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;">3</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;"> car </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> Car </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">New</span><span style="color: #000000;"> Car(</span><span style="color: #800000;">"</span><span style="color: #800000;">Ferrari</span><span style="color: #800000;">"</span><span style="color: #000000;">)
</span><span style="color: #008080;">4</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> car.Pilot </span><span style="color: #000000;">=</span><span style="color: #000000;"> pilot
</span><span style="color: #008080;">5</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> db.Set(car)
</span><span style="color: #008080;">6</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> db.Rollback()
</span><span style="color: #008080;">7</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><br><div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">TransactionExample.vb: <span class="fscMemberName">ListAllCars</span></span></div><div class="fscCode"><pre ID=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_ListAllCars_1876_65"><div><!--
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--><span style="color: #008080;">1</span><img id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_ListAllCars_1876_65_14_166_Open_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_ListAllCars_1876_65_14_166_Open_Text').style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_ListAllCars_1876_65_14_166_Closed_Image').style.display='inline'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_ListAllCars_1876_65_14_166_Closed_Text').style.display='inline';"/><img id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_ListAllCars_1876_65_14_166_Closed_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_ListAllCars_1876_65_14_166_Closed_Text').style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_ListAllCars_1876_65_14_166_Open_Image').style.display='inline'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_ListAllCars_1876_65_14_166_Open_Text').style.display='inline';"/><span style="color: #0000FF;">Public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">Shared</span><span style="color: #000000;"> </span><span id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_ListAllCars_1876_65_14_166_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">Sub ListAllCars()</span><span id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_ListAllCars_1876_65_14_166_Open_Text"><span style="color: #0000FF;">Sub</span><span style="color: #000000;"> ListAllCars(</span><span style="color: #0000FF;">ByVal</span><span style="color: #000000;"> db </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IObjectContainer)
</span><span style="color: #008080;">2</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;"> db.Get(</span><span style="color: #0000FF;">GetType</span><span style="color: #000000;">(Car))
</span><span style="color: #008080;">3</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> ListResult(result)
</span><span style="color: #008080;">4</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>
<a name="Refresh Live Objects"></a><h2>Refresh Live Objects</h2>
<p>There is one thing that you should remember when rolling back: the <code>#rollback()</code> method will cancel the modifications, but it won't change back the state of the objects in your reference cache.</p>
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<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">TransactionExample.cs: <span class="fscMemberName">CarSnapshotRollback</span></span></div><div class="fscCode"><pre ID=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_CarSnapshotRollback_2253_76"><div><!--
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--><span style="color: #008080;">1</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;"> CarSnapshotRollback(IObjectContainer db)
</span><span style="color: #008080;">2</span><span style="color: #000000;"><img id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_CarSnapshotRollback_2253_76_69_294_Open_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_CarSnapshotRollback_2253_76_69_294_Open_Text').style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_CarSnapshotRollback_2253_76_69_294_Closed_Image').style.display='inline'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_CarSnapshotRollback_2253_76_69_294_Closed_Text').style.display='inline';"/><img id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_CarSnapshotRollback_2253_76_69_294_Closed_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_CarSnapshotRollback_2253_76_69_294_Closed_Text').style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_CarSnapshotRollback_2253_76_69_294_Open_Image').style.display='inline'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_CarSnapshotRollback_2253_76_69_294_Open_Text').style.display='inline';"/> </span><span id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_CarSnapshotRollback_2253_76_69_294_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_CarSnapshotRollback_2253_76_69_294_Open_Text"><span style="color: #000000;">{
</span><span style="color: #008080;">3</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;"> db.Get(</span><span style="color: #0000FF;">new</span><span style="color: #000000;"> Car(</span><span style="color: #800000;">"</span><span style="color: #800000;">BMW</span><span style="color: #800000;">"</span><span style="color: #000000;">));
</span><span style="color: #008080;">4</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> Car car </span><span style="color: #000000;">=</span><span style="color: #000000;"> (Car)result.Next();
</span><span style="color: #008080;">5</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> car.Snapshot();
</span><span style="color: #008080;">6</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> db.Set(car);
</span><span style="color: #008080;">7</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> db.Rollback();
</span><span style="color: #008080;">8</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> Console.WriteLine(car);
</span><span style="color: #008080;">9</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/> }</span></span></div></pre></div></div>
</span>
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<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">TransactionExample.vb: <span class="fscMemberName">CarSnapshotRollback</span></span></div><div class="fscCode"><pre ID=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_CarSnapshotRollback_2393_76"><div><!--
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--><span style="color: #008080;">1</span><img id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_CarSnapshotRollback_2393_76_14_317_Open_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_CarSnapshotRollback_2393_76_14_317_Open_Text').style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_CarSnapshotRollback_2393_76_14_317_Closed_Image').style.display='inline'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_CarSnapshotRollback_2393_76_14_317_Closed_Text').style.display='inline';"/><img id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_CarSnapshotRollback_2393_76_14_317_Closed_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_CarSnapshotRollback_2393_76_14_317_Closed_Text').style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_CarSnapshotRollback_2393_76_14_317_Open_Image').style.display='inline'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_CarSnapshotRollback_2393_76_14_317_Open_Text').style.display='inline';"/><span style="color: #0000FF;">Public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">Shared</span><span style="color: #000000;"> </span><span id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_CarSnapshotRollback_2393_76_14_317_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">Sub CarSnapshotRollback()</span><span id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_CarSnapshotRollback_2393_76_14_317_Open_Text"><span style="color: #0000FF;">Sub</span><span style="color: #000000;"> CarSnapshotRollback(</span><span style="color: #0000FF;">ByVal</span><span style="color: #000000;"> db </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IObjectContainer)
</span><span style="color: #008080;">2</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;"> db.Get(</span><span style="color: #0000FF;">New</span><span style="color: #000000;"> Car(</span><span style="color: #800000;">"</span><span style="color: #800000;">BMW</span><span style="color: #800000;">"</span><span style="color: #000000;">))
</span><span style="color: #008080;">3</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;"> car </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> Car </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">DirectCast</span><span style="color: #000000;">(result.Next(), Car)
</span><span style="color: #008080;">4</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> car.Snapshot()
</span><span style="color: #008080;">5</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> db.Set(car)
</span><span style="color: #008080;">6</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> db.Rollback()
</span><span style="color: #008080;">7</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> Console.WriteLine(car)
</span><span style="color: #008080;">8</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>You have to explicitly refresh your live objects when their state might become different from the state in the database:</p>
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<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">TransactionExample.cs: <span class="fscMemberName">CarSnapshotRollbackRefresh</span></span></div><div class="fscCode"><pre ID=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_CarSnapshotRollbackRefresh_2668_83"><div><!--
Code highlighting produced by Actipro CodeHighlighter (freeware)
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--><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;"> CarSnapshotRollbackRefresh(IObjectContainer db)
</span><span style="color: #008080;">02</span><span style="color: #000000;"><img id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_CarSnapshotRollbackRefresh_2668_83_76_346_Open_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_CarSnapshotRollbackRefresh_2668_83_76_346_Open_Text').style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_CarSnapshotRollbackRefresh_2668_83_76_346_Closed_Image').style.display='inline'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_CarSnapshotRollbackRefresh_2668_83_76_346_Closed_Text').style.display='inline';"/><img id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_CarSnapshotRollbackRefresh_2668_83_76_346_Closed_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_CarSnapshotRollbackRefresh_2668_83_76_346_Closed_Text').style.display='none'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_CarSnapshotRollbackRefresh_2668_83_76_346_Open_Image').style.display='inline'; document.getElementById('.TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_CarSnapshotRollbackRefresh_2668_83_76_346_Open_Text').style.display='inline';"/> </span><span id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_CarSnapshotRollbackRefresh_2668_83_76_346_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id=".TransactionsCS.ZipsTransactionExample.Cs_TransactionExample.Cs_CarSnapshotRollbackRefresh_2668_83_76_346_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"/> IObjectSet result</span><span style="color: #000000;">=</span><span style="color: #000000;">db.Get(</span><span style="color: #0000FF;">new</span><span style="color: #000000;"> Car(</span><span style="color: #800000;">"</span><span style="color: #800000;">BMW</span><span style="color: #800000;">"</span><span style="color: #000000;">));
</span><span style="color: #008080;">04</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> Car car</span><span style="color: #000000;">=</span><span style="color: #000000;">(Car)result.Next();
</span><span style="color: #008080;">05</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> car.Snapshot();
</span><span style="color: #008080;">06</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> db.Set(car);
</span><span style="color: #008080;">07</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> db.Rollback();
</span><span style="color: #008080;">08</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> db.Ext().Refresh(car, </span><span style="color: #0000FF;">int</span><span style="color: #000000;">.MaxValue);
</span><span style="color: #008080;">09</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> Console.WriteLine(car);
</span><span style="color: #008080;">10</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/> }</span></span></div></pre></div></div>
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<div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">TransactionExample.vb: <span class="fscMemberName">CarSnapshotRollbackRefresh</span></span></div><div class="fscCode"><pre ID=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_CarSnapshotRollbackRefresh_2815_83"><div><!--
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--><span style="color: #008080;">1</span><img id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_CarSnapshotRollbackRefresh_2815_83_14_376_Open_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_CarSnapshotRollbackRefresh_2815_83_14_376_Open_Text').style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_CarSnapshotRollbackRefresh_2815_83_14_376_Closed_Image').style.display='inline'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_CarSnapshotRollbackRefresh_2815_83_14_376_Closed_Text').style.display='inline';"/><img id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_CarSnapshotRollbackRefresh_2815_83_14_376_Closed_Image" src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_CarSnapshotRollbackRefresh_2815_83_14_376_Closed_Text').style.display='none'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_CarSnapshotRollbackRefresh_2815_83_14_376_Open_Image').style.display='inline'; document.getElementById('.TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_CarSnapshotRollbackRefresh_2815_83_14_376_Open_Text').style.display='inline';"/><span style="color: #0000FF;">Public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">Shared</span><span style="color: #000000;"> </span><span id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_CarSnapshotRollbackRefresh_2815_83_14_376_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">Sub CarSnapshotRollbackRefresh()</span><span id=".TransactionsVB.ZipsTransactionExample.Vb_TransactionExample.Vb_CarSnapshotRollbackRefresh_2815_83_14_376_Open_Text"><span style="color: #0000FF;">Sub</span><span style="color: #000000;"> CarSnapshotRollbackRefresh(</span><span style="color: #0000FF;">ByVal</span><span style="color: #000000;"> db </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> IObjectContainer)
</span><span style="color: #008080;">2</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;"> db.Get(</span><span style="color: #0000FF;">New</span><span style="color: #000000;"> Car(</span><span style="color: #800000;">"</span><span style="color: #800000;">BMW</span><span style="color: #800000;">"</span><span style="color: #000000;">))
</span><span style="color: #008080;">3</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;"> car </span><span style="color: #0000FF;">As</span><span style="color: #000000;"> Car </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">DirectCast</span><span style="color: #000000;">(result.Next(), Car)
</span><span style="color: #008080;">4</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> car.Snapshot()
</span><span style="color: #008080;">5</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> db.Set(car)
</span><span style="color: #008080;">6</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> db.Rollback()
</span><span style="color: #008080;">7</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> db.Ext().Refresh(car, </span><span style="color: #0000FF;">Integer</span><span style="color: #000000;">.MaxValue)
</span><span style="color: #008080;">8</span><span style="color: #000000;"><img src="../../Utility/ActiPro.CodeHighligher/OutliningIndicators/InBlock.gif" align="top"/> Console.WriteLine(car)
</span><span style="color: #008080;">9</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>
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<p>The <code>#refresh()</code> method might be also helpful when the changes to the database are done from different threads. See <a href="../client-server.html" class="wikiLink">Client-Server</a> for more information.</p></div>
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This revision (13) was last Modified 2007-08-20T12:18:37 by Tetyana.
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