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db4-devel-4.7.25 /
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BerkeleyDB-Core-JAVA-GSG.pdf
669.52
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CoreEnvUsage.html
6.09
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CoreJavaUsage.html
6.65
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Cursors.html
6.73
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DB.html
5.9
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DBAdmin.html
5.04
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DBEntry.html
9.8
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DeleteEntryWCursor.html
4.05
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Env.html
6.86
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EnvClose.html
3.75
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EnvProps.html
9.93
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Positioning.html
20.89
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PutEntryWCursor.html
7.81
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ReplacingEntryWCursor.html
5.03
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accessmethods.html
12.29
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baseapi.html
14.46
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bindAPI.html
28.52
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btree.html
20.79
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cachesize.html
4.5
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concepts.html
8.52
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coreExceptions.html
3.64
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coredbclose.html
3.98
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cursorJavaUsage.html
12.58
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dataaccessorclass.html
4.68
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databaseLimits.html
3.68
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dbErrorReporting.html
5.01
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db_config.html
6.97
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dbconfig.html
17.05
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dbtJavaUsage.html
27.23
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dpl.html
10.48
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dpl_delete.html
3.85
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dpl_entityjoin.html
7.19
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dpl_example.html
9.04
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dpl_exampledatabaseput.html
14.21
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dpl_exampleinventoryread.html
10.88
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dpl_replace.html
4.65
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dplindexcreate.html
19.48
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environments.html
6.49
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getmultiple.html
13.83
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gettingStarted.css
895
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gettingit.html
3.38
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index.html
29.36
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indexes.html
14.43
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introduction.html
11.72
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inventoryclass.html
4.62
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javadplconcepts.html
24.78
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javaindexusage.html
22.04
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joins.html
13.78
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keyCreator.html
11.79
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mydbenv-persist.html
5.71
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persist_access.html
8.2
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persist_first.html
11.91
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persist_index.html
9.86
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persistobject.html
5.62
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preface.html
8.03
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readSecondary.html
4.85
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returns.html
3.44
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saveret.html
5.35
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secondaryCursor.html
5.44
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secondaryDelete.html
4.81
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secondaryProps.html
3.87
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simpleda.html
4.22
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simpleget.html
6.5
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simpleput.html
8.09
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usingDbt.html
16.49
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Code Editor : readSecondary.html
<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>Reading Secondary Databases</title> <link rel="stylesheet" href="gettingStarted.css" type="text/css" /> <meta name="generator" content="DocBook XSL Stylesheets V1.62.4" /> <link rel="home" href="index.html" title="Getting Started with Berkeley DB" /> <link rel="up" href="indexes.html" title="Chapter 10. Secondary Databases" /> <link rel="previous" href="secondaryProps.html" title="Secondary Database Properties" /> <link rel="next" href="secondaryDelete.html" title="Deleting Secondary Database Records" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">Reading Secondary Databases</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="secondaryProps.html">Prev</a> </td> <th width="60%" align="center">Chapter 10. Secondary Databases</th> <td width="20%" align="right"> <a accesskey="n" href="secondaryDelete.html">Next</a></td> </tr> </table> <hr /> </div> <div class="sect1" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h2 class="title" style="clear: both"><a id="readSecondary"></a>Reading Secondary Databases</h2> </div> </div> <div></div> </div> <p> Like a primary database, you can read records from your secondary database either by using the <span> <tt class="methodname">SecondaryDatabase.get()</tt> method, </span> or by using <span>a <tt class="classname">SecondaryCursor</tt>.</span> The main difference between reading secondary and primary databases is that when you read a secondary database record, the secondary record's data is not returned to you. Instead, the primary key and data corresponding to the secondary key are returned to you. </p> <p> For example, assuming your secondary database contains keys related to a person's full name: </p> <a id="java_index6"></a> <pre class="programlisting">package db.GettingStarted; import com.sleepycat.db.DatabaseEntry; import com.sleepycat.db.LockMode; import com.sleepycat.db.OperationStatus; import com.sleepycat.db.SecondaryDatabase; ... SecondaryDatabase mySecondaryDatabase = null; try { // Omitting all database opens ... String searchName = "John Doe"; DatabaseEntry searchKey = new DatabaseEntry(searchName.getBytes("UTF-8")); DatabaseEntry primaryKey = new DatabaseEntry(); DatabaseEntry primaryData = new DatabaseEntry(); // Get the primary key and data for the user 'John Doe'. OperationStatus retVal = mySecondaryDatabase.get(null, searchKey, primaryKey, primaryData, LockMode.DEFAULT); } catch (Exception e) { // Exception handling goes here }</pre> <p> Note that, just like <span><tt class="methodname">Database.get()</tt>, </span> if your secondary database supports duplicate records then <tt class="methodname">SecondaryDatabase.get()</tt> only return the first record found in a matching duplicates set. If you want to see all the records related to a specific secondary key, then use a <span> <tt class="classname">SecondaryCursor</tt> (described in <a href="secondaryCursor.html"> <span>Using Secondary Cursors</span> </a>). </span> </p> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="secondaryProps.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="indexes.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="secondaryDelete.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">Secondary Database Properties </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> Deleting Secondary Database Records</td> </tr> </table> </div> </body> </html>
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