1<?xml version="1.0" encoding="UTF-8" standalone="no"?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 3<html xmlns="http://www.w3.org/1999/xhtml"> 4 <head> 5 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> 6 <title>SimpleDA.class</title> 7 <link rel="stylesheet" href="gettingStarted.css" type="text/css" /> 8 <meta name="generator" content="DocBook XSL Stylesheets V1.62.4" /> 9 <link rel="home" href="index.html" title="Getting Started with Berkeley DB" /> 10 <link rel="up" href="persist_access.html" title="Chapter��5.��Saving and Retrieving Objects" /> 11 <link rel="previous" href="persist_access.html" title="Chapter��5.��Saving and Retrieving Objects" /> 12 <link rel="next" href="simpleput.html" title="Placing Objects in an Entity Store" /> 13 </head> 14 <body> 15 <div class="navheader"> 16 <table width="100%" summary="Navigation header"> 17 <tr> 18 <th colspan="3" align="center">SimpleDA.class</th> 19 </tr> 20 <tr> 21 <td width="20%" align="left"><a accesskey="p" href="persist_access.html">Prev</a>��</td> 22 <th width="60%" align="center">Chapter��5.��Saving and Retrieving Objects</th> 23 <td width="20%" align="right">��<a accesskey="n" href="simpleput.html">Next</a></td> 24 </tr> 25 </table> 26 <hr /> 27 </div> 28 <div class="sect1" lang="en" xml:lang="en"> 29 <div class="titlepage"> 30 <div> 31 <div> 32 <h2 class="title" style="clear: both"><a id="simpleda"></a>SimpleDA.class</h2> 33 </div> 34 </div> 35 <div></div> 36 </div> 37 <p> 38 As mentioned above, we organize our primary and 39 secondary indexes using a specialize data 40 accessor class. The main reason for this class 41 to exist is to provide convenient access to all 42 the indexes in use for our entity class (see 43 the previous section, <a href="persist_access.html#simpleentity">A Simple Entity Class</a>, for that 44 implementation). 45 </p> 46 <p> 47 For a description on retrieving primary and 48 secondary indexes under the DPL, see 49 <a href="persist_index.html">Working with Indices</a> 50 </p> 51 <pre class="programlisting">package persist.gettingStarted; 52 53import java.io.File; 54 55import com.sleepycat.db.DatabaseException; 56import com.sleepycat.persist.EntityStore; 57import com.sleepycat.persist.PrimaryIndex; 58import com.sleepycat.persist.SecondaryIndex; 59 60public class SimpleDA { 61 // Open the indices 62 public SimpleDA(EntityStore store) 63 throws DatabaseException { 64 65 // Primary key for SimpleEntityClass classes 66 pIdx = store.getPrimaryIndex( 67 String.class, SimpleEntityClass.class); 68 69 // Secondary key for SimpleEntityClass classes 70 // Last field in the getSecondaryIndex() method must be 71 // the name of a class member; in this case, an 72 // SimpleEntityClass.class data member. 73 sIdx = store.getSecondaryIndex( 74 pIdx, String.class, "sKey"); 75 } 76 77 // Index Accessors 78 PrimaryIndex<String,SimpleEntityClass> pIdx; 79 SecondaryIndex<String,String,SimpleEntityClass> sIdx; 80} </pre> 81 </div> 82 <div class="navfooter"> 83 <hr /> 84 <table width="100%" summary="Navigation footer"> 85 <tr> 86 <td width="40%" align="left"><a accesskey="p" href="persist_access.html">Prev</a>��</td> 87 <td width="20%" align="center"> 88 <a accesskey="u" href="persist_access.html">Up</a> 89 </td> 90 <td width="40%" align="right">��<a accesskey="n" href="simpleput.html">Next</a></td> 91 </tr> 92 <tr> 93 <td width="40%" align="left" valign="top">Chapter��5.��Saving and Retrieving Objects��</td> 94 <td width="20%" align="center"> 95 <a accesskey="h" href="index.html">Home</a> 96 </td> 97 <td width="40%" align="right" valign="top">��Placing Objects in an Entity Store</td> 98 </tr> 99 </table> 100 </div> 101 </body> 102</html> 103