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<h1>Collections</h1><script>
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</script><p><font color="#990000">This topic applies to Java version only</font> </p><p>This section covers examples on Collection, including array, Set, List and Map. </p><p>As an experienced db4o user, you may know that db4o treats Collection
as first class object, which means it assigns unique UUID to each
Collection. Hence a Collection can be shared among many owners. This is
different to Hibernate's approach, where Collection does not have a
unique ID and they cannot be shared among objects.</p><p>To bridge this gap, dRS treats Collections as second class objects and
does not assign UUIDs to them. When a shared Collection is replicated
from db4o to Hibernate using dRS, it is automatically cloned. Each
owner of the Collection receives a copy of the Collection. Further
modifications to the db4o copy will not be replicated to cloned copies.
Therefore, you cannot share Collections if you want to perform RDBMS
replications with dRS.</p><p>In the following examples, we will use Car as the element in the following examples. </p><div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">Car.java</span></div><div class="fscCode"><pre ID="....Hibernate.Zipsf1collectionCar.Java_F1collectionCar.Java_1083_52"><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;">package</span><span style="color: #000000;"> f1.collection;
</span><span style="color: #008080;">2</span><span style="color: #000000;"><img src="../../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/>
</span><span style="color: #008080;">3</span><span style="color: #000000;"><img id="....Hibernate.Zipsf1collectionCar.Java_F1collectionCar.Java_1083_52_41_88_Open_Image" src="../../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockStart.gif" align="top" onClick="this.style.display='none'; document.getElementById('....Hibernate.Zipsf1collectionCar.Java_F1collectionCar.Java_1083_52_41_88_Open_Text').style.display='none'; document.getElementById('....Hibernate.Zipsf1collectionCar.Java_F1collectionCar.Java_1083_52_41_88_Closed_Image').style.display='inline'; document.getElementById('....Hibernate.Zipsf1collectionCar.Java_F1collectionCar.Java_1083_52_41_88_Closed_Text').style.display='inline';"/><img id="....Hibernate.Zipsf1collectionCar.Java_F1collectionCar.Java_1083_52_41_88_Closed_Image" src="../../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ContractedBlock.gif" align="top" style="display: none;" onClick="this.style.display='none'; document.getElementById('....Hibernate.Zipsf1collectionCar.Java_F1collectionCar.Java_1083_52_41_88_Closed_Text').style.display='none'; document.getElementById('....Hibernate.Zipsf1collectionCar.Java_F1collectionCar.Java_1083_52_41_88_Open_Image').style.display='inline'; document.getElementById('....Hibernate.Zipsf1collectionCar.Java_F1collectionCar.Java_1083_52_41_88_Open_Text').style.display='inline';"/></span><span style="color: #0000FF;">public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">class</span><span style="color: #000000;"> Car </span><span id="....Hibernate.Zipsf1collectionCar.Java_F1collectionCar.Java_1083_52_41_88_Closed_Text" style="border: solid 1px #808080; background-color: #FFFFFF; display: none;">...</span><span id="....Hibernate.Zipsf1collectionCar.Java_F1collectionCar.Java_1083_52_41_88_Open_Text"><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"/> </span><span style="color: #0000FF;">public</span><span style="color: #000000;"> String brand;
</span><span style="color: #008080;">5</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;"> String model;
</span><span style="color: #008080;">6</span><span style="color: #000000;"><img src="../../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/ExpandedBlockEnd.gif" align="top"/>}</span></span></div></pre></div></div> </p><div class="FormattedSourceCode"><div class="fscHeader"><span class="fscFileName">Car.hbm.xml</span></div><div class="fscCode"><pre ID="....Hibernate.Zipsf1collectionCar.Hbm.Xml_F1collectionCar.Hbm.Xml_1140_55"><div><!--
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--><span style="color: #008080;">01</span><img src="../../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/><span style="color: #0000FF;"><?</span><span style="color: #FF00FF;">xml version="1.0"</span><span style="color: #0000FF;">?></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: #008080;">03</span><span style="color: #000000;"><img src="../../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/></span><span style="color: #0000FF;"><!</span><span style="color: #FF00FF;">DOCTYPE hibernate-mapping PUBLIC
</span><span style="color: #008080;">04</span><span style="color: #FF00FF;"><img src="../../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/> "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
</span><span style="color: #008080;">05</span><span style="color: #FF00FF;"><img src="../../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/> "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"</span><span style="color: #0000FF;">></span><span style="color: #000000;">
</span><span style="color: #008080;">06</span><span style="color: #000000;"><img src="../../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/>
</span><span style="color: #008080;">07</span><span style="color: #000000;"><img src="../../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/></span><span style="color: #0000FF;"><</span><span style="color: #800000;">hibernate-mapping </span><span style="color: #FF0000;">default-access</span><span style="color: #0000FF;">="field"</span><span style="color: #FF0000;"> default-lazy</span><span style="color: #0000FF;">="false"</span><span style="color: #FF0000;">
</span><span style="color: #008080;">08</span><span style="color: #FF0000;"><img src="../../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/> default-cascade</span><span style="color: #0000FF;">="save-update"</span><span style="color: #0000FF;">></span><span style="color: #000000;">
</span><span style="color: #008080;">09</span><span style="color: #000000;"><img src="../../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/> </span><span style="color: #0000FF;"><</span><span style="color: #800000;">class </span><span style="color: #FF0000;">name</span><span style="color: #0000FF;">="f1.collection.Car"</span><span style="color: #0000FF;">></span><span style="color: #000000;">
</span><span style="color: #008080;">10</span><span style="color: #000000;"><img src="../../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/> </span><span style="color: #0000FF;"><</span><span style="color: #800000;">id </span><span style="color: #FF0000;">column</span><span style="color: #0000FF;">="typed_id"</span><span style="color: #FF0000;"> type</span><span style="color: #0000FF;">="long"</span><span style="color: #0000FF;">></span><span style="color: #000000;">
</span><span style="color: #008080;">11</span><span style="color: #000000;"><img src="../../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/> </span><span style="color: #0000FF;"><</span><span style="color: #800000;">generator </span><span style="color: #FF0000;">class</span><span style="color: #0000FF;">="native"</span><span style="color: #0000FF;">/></span><span style="color: #000000;">
</span><span style="color: #008080;">12</span><span style="color: #000000;"><img src="../../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/> </span><span style="color: #0000FF;"></</span><span style="color: #800000;">id</span><span style="color: #0000FF;">></span><span style="color: #000000;">
</span><span style="color: #008080;">13</span><span style="color: #000000;"><img src="../../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/> </span><span style="color: #0000FF;"><</span><span style="color: #800000;">property </span><span style="color: #FF0000;">name</span><span style="color: #0000FF;">="brand"</span><span style="color: #0000FF;">/></span><span style="color: #000000;">
</span><span style="color: #008080;">14</span><span style="color: #000000;"><img src="../../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/> </span><span style="color: #0000FF;"><</span><span style="color: #800000;">property </span><span style="color: #FF0000;">name</span><span style="color: #0000FF;">="model"</span><span style="color: #0000FF;">/></span><span style="color: #000000;">
</span><span style="color: #008080;">15</span><span style="color: #000000;"><img src="../../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/> </span><span style="color: #0000FF;"></</span><span style="color: #800000;">class</span><span style="color: #0000FF;">></span><span style="color: #000000;">
</span><span style="color: #008080;">16</span><span style="color: #000000;"><img src="../../../../Utility/ActiPro.CodeHighligher/OutliningIndicators/None.gif" align="top"/></span><span style="color: #0000FF;"></</span><span style="color: #800000;">hibernate-mapping</span><span style="color: #0000FF;">></span></div></pre></div></div> </p><p><div class="childTopicList">More Reading:<ul>
<li><p><a href="collections/array.html" class="wikiLink">Array</a></p></li>
<li><p><a href="collections/list.html" class="wikiLink">List</a></p></li>
<li><p><a href="collections/set.html" class="wikiLink">Set</a></p></li>
<li><p><a href="collections/map.html" class="wikiLink">Map</a></p></li>
</ul></div>
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This revision (2) was last Modified 2007-07-09T14:59:13 by Tetyana.
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