Edit File: dataaccessorclass.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>DataAccessor.class</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="dpl_example.html" title="Chapter 6. A DPL Example" /> <link rel="previous" href="mydbenv-persist.html" title="MyDbEnv" /> <link rel="next" href="dpl_exampledatabaseput.html" title="ExampleDatabasePut.class" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">DataAccessor.class</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="mydbenv-persist.html">Prev</a> </td> <th width="60%" align="center">Chapter 6. A DPL Example</th> <td width="20%" align="right"> <a accesskey="n" href="dpl_exampledatabaseput.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="dataaccessorclass"></a>DataAccessor.class</h2> </div> </div> <div></div> </div> <p> Now that we have implemented our data classes, we can write a class that will provide convenient access to our primary and secondary indexes. Note that like our data classes, this class is shared by both our example programs. </p> <p> If you compare this class against our <tt class="classname">Vendor</tt> and <tt class="classname">Inventory</tt> class implementations, you will see that the primary and secondary indices declared there are referenced by this class. </p> <p> See <a href="dpl_example.html#vendorclass">Vendor.class</a> and <a href="inventoryclass.html">Inventory.class</a> for those implementations. </p> <pre class="programlisting">package persist.gettingStarted; import java.io.File; import com.sleepycat.db.DatabaseException; import com.sleepycat.persist.EntityStore; import com.sleepycat.persist.PrimaryIndex; import com.sleepycat.persist.SecondaryIndex; public class DataAccessor { // Open the indices public DataAccessor(EntityStore store) throws DatabaseException { // Primary key for Inventory classes inventoryBySku = store.getPrimaryIndex( String.class, Inventory.class); // Secondary key for Inventory classes // Last field in the getSecondaryIndex() method must be // the name of a class member; in this case, an Inventory.class // data member. inventoryByName = store.getSecondaryIndex( inventoryBySku, String.class, "itemName"); // Primary key for Vendor class vendorByName = store.getPrimaryIndex( String.class, Vendor.class); } // Inventory Accessors PrimaryIndex<String,Inventory> inventoryBySku; SecondaryIndex<String,String,Inventory> inventoryByName; // Vendor Accessors PrimaryIndex<String,Vendor> vendorByName; } </pre> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="mydbenv-persist.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="dpl_example.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="dpl_exampledatabaseput.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">MyDbEnv </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> ExampleDatabasePut.class</td> </tr> </table> </div> </body> </html>
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