Import BSDDB 4.7.25 (as of svn r89086)

2017-09-04 13:40:25 -05:00
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+<?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&lt;String,Inventory&gt; inventoryBySku;
+    SecondaryIndex&lt;String,String,Inventory&gt; inventoryByName;
+
+    // Vendor Accessors
+    PrimaryIndex&lt;String,Vendor&gt; 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>