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105 lines
4.4 KiB
HTML
105 lines
4.4 KiB
HTML
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>SimpleDA.class</title>
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<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Getting Started with Berkeley DB Java Edition" />
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<link rel="up" href="persist_access.html" title="Chapter 5. Saving and Retrieving Objects" />
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<link rel="prev" href="persist_access.html" title="Chapter 5. Saving and Retrieving Objects" />
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<link rel="next" href="simpleput.html" title="Placing Objects in an Entity Store" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 12.2.7.5</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">SimpleDA.class</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="persist_access.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 5. Saving and Retrieving Objects</th>
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<td width="20%" align="right"> <a accesskey="n" href="simpleput.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="simpleda"></a>SimpleDA.class</h2>
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</div>
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</div>
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</div>
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<p>
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As mentioned above, we organize our primary and
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secondary indexes using a specialize data
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accessor class. The main reason for this class
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to exist is to provide convenient access to all
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the indexes in use for our entity class (see
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the previous section, <a class="xref" href="persist_access.html#simpleentity" title="A Simple Entity Class">A Simple Entity Class</a>, for that
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implementation).
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</p>
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<p>
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For a description on retrieving primary and
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secondary indexes under the DPL, see
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<a class="xref" href="persist_index.html" title="Chapter 4. Working with Indices">Working with Indices</a>
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</p>
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<pre class="programlisting">package persist.gettingStarted;
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import java.io.File;
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import com.sleepycat.je.DatabaseException;
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import com.sleepycat.persist.EntityStore;
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import com.sleepycat.persist.PrimaryIndex;
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import com.sleepycat.persist.SecondaryIndex;
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public class SimpleDA {
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// Open the indices
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public SimpleDA(EntityStore store)
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throws DatabaseException {
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// Primary key for SimpleEntityClass classes
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pIdx = store.getPrimaryIndex(
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String.class, SimpleEntityClass.class);
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// Secondary key for SimpleEntityClass classes
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// Last field in the getSecondaryIndex() method must be
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// the name of a class member; in this case, an
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// SimpleEntityClass.class data member.
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sIdx = store.getSecondaryIndex(
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pIdx, String.class, "sKey");
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}
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// Index Accessors
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PrimaryIndex<String,SimpleEntityClass> pIdx;
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SecondaryIndex<String,String,SimpleEntityClass> sIdx;
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} </pre>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="persist_access.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="persist_access.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="simpleput.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">Chapter 5. Saving and Retrieving Objects </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> Placing Objects in an Entity Store</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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