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db4-devel-4.7.25 /
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BerkeleyDB-Core-JAVA-GSG.pdf
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CoreEnvUsage.html
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CoreJavaUsage.html
6.65
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Cursors.html
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DB.html
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DBAdmin.html
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DBEntry.html
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DeleteEntryWCursor.html
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Env.html
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EnvClose.html
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EnvProps.html
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Positioning.html
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PutEntryWCursor.html
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ReplacingEntryWCursor.html
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accessmethods.html
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baseapi.html
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bindAPI.html
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btree.html
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cachesize.html
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concepts.html
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coreExceptions.html
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coredbclose.html
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cursorJavaUsage.html
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dataaccessorclass.html
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databaseLimits.html
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dbErrorReporting.html
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db_config.html
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dbconfig.html
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dbtJavaUsage.html
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dpl.html
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dpl_delete.html
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dpl_entityjoin.html
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dpl_example.html
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dpl_exampledatabaseput.html
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dpl_exampleinventoryread.html
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dpl_replace.html
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dplindexcreate.html
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environments.html
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getmultiple.html
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gettingStarted.css
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gettingit.html
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index.html
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indexes.html
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introduction.html
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inventoryclass.html
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javadplconcepts.html
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javaindexusage.html
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joins.html
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keyCreator.html
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mydbenv-persist.html
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persist_access.html
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persist_first.html
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persist_index.html
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persistobject.html
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preface.html
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readSecondary.html
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returns.html
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saveret.html
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secondaryCursor.html
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secondaryDelete.html
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secondaryProps.html
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simpleda.html
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simpleget.html
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simpleput.html
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usingDbt.html
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Code Editor : dpl_replace.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>Replacing Entity Objects</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="persist_access.html" title="Chapter 5. Saving and Retrieving Objects" /> <link rel="previous" href="dpl_delete.html" title="Deleting Entity Objects" /> <link rel="next" href="dpl_example.html" title="Chapter 6. A DPL Example" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">Replacing Entity Objects</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="dpl_delete.html">Prev</a> </td> <th width="60%" align="center">Chapter 5. Saving and Retrieving Objects</th> <td width="20%" align="right"> <a accesskey="n" href="dpl_example.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="dpl_replace"></a>Replacing Entity Objects</h2> </div> </div> <div></div> </div> <p> To modify a stored entity object, retrieve it, update it, then put it back to the entity store: </p> <pre class="programlisting"> SimpleEntityClass sec = sda.pIdx.get("keyone"); sec.setsKey("skeyoneupdated"); sda.pIdx.put(sec); </pre> <p> Note that because we updated a field on the object that is a secondary key, this object will now be accessible by the secondary key of <tt class="literal">skeyoneupdated</tt> instead of the previous value, which was <tt class="literal">skeyone</tt> </p> <p> Be aware that if you modify the object's primary key, the behavior is somewhat different. In this case, you cause a new instance of the object to be created in the store, instead of replacing an existing instance: </p> <pre class="programlisting">// Results in two objects in the store. One with a // primary index of "keyfive" and the other with primary index of //'keyfivenew'. SimpleEntityClass sec = sda.pIdx.get("keyfive"); sec.setpKey("keyfivenew"); sda.pIdx.put(sec); </pre> <p> Finally, if you are iterating over a collection of objects using an <tt class="classname">EntityCursor</tt>, you can update each object in turn using <tt class="methodname">EntityCursor.update()</tt>. Note, however, that you must be iterating using a <tt class="classname">PrimaryIndex</tt>; this operation is not allowed if you are using a <tt class="classname">SecondaryIndex</tt>. </p> <p> For example, the following iterates over every <tt class="classname">SimpleEntityClass</tt> object in the entity store, and it changes them all so that they have a secondary index of <tt class="literal">updatedskey</tt>: </p> <pre class="programlisting">EntityCursor<SimpleEntityClass> sec_pcursor = sda.pIdx.entities(); for (SimpleEntityClass sec : sec_pcursor) { sec.setsKey("updatedskey"); sec_pcursor.update(item); } sec_pcursor.close(); </pre> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="dpl_delete.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="persist_access.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="dpl_example.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">Deleting Entity Objects </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> Chapter 6. A DPL Example</td> </tr> </table> </div> </body> </html>
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