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HTML
230 lines
8.9 KiB
HTML
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>Adding Database Items</title>
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<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB Java Edition Collections Tutorial" />
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<link rel="up" href="BasicProgram.html" title="Chapter 2. The Basic Program" />
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<link rel="prev" href="usingtransactions.html" title="Using Transactions" />
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<link rel="next" href="retrievingdatabaseitems.html" title="Retrieving Database Items" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 12.2.7.5</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">
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Adding Database Items
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</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="usingtransactions.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 2.
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The Basic Program
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="retrievingdatabaseitems.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="addingdatabaseitems"></a>
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Adding Database Items
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</h2>
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</div>
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</div>
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</div>
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<p>
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Adding (as well as updating, removing, and deleting) information
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in the database is accomplished via the standard Java collections
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API. In the example, the
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<a class="ulink" href="http://download.oracle.com/javase/1.5.0/docs/api/java/util/Map.html#put(K, V)" target="_top">Map.put</a>
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method is used to add objects. All standard Java methods for
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modifying a collection may be used with the JE JE Collections API.
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</p>
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<p>
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The <code class="methodname">PopulateDatabase.doWork()</code> method calls private methods
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for adding objects to each of the three database stores. It is
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called via the
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<a class="ulink" href="../../java/com/sleepycat/collections/TransactionRunner.html" target="_top">TransactionRunner</a>
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class and was outlined in the previous section.
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</p>
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<a id="cb_populatedatabase"></a>
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<pre class="programlisting">import java.util.Map;
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import com.sleepycat.collections.TransactionWorker;
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...
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public class Sample
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{
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...
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private SampleViews views;
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...
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private class PopulateDatabase implements TransactionWorker
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{
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public void doWork()
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throws Exception
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{
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<strong class="userinput"><code> addSuppliers();
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addParts();
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addShipments();</code></strong>
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}
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}
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...
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<strong class="userinput"><code> private void addSuppliers()
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{
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}
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private void addParts()
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{
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}
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private void addShipments()
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{
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}</code></strong>
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} </pre>
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<p>
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The <code class="methodname">addSuppliers()</code>, <code class="methodname">addParts()</code> and <code class="methodname">addShipments()</code>
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methods add objects to the Suppliers, Parts and Shipments stores.
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The
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<a class="ulink" href="http://download.oracle.com/javase/1.5.0/docs/api/java/util/Map.html" target="_top">Map</a>
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for each store is obtained from the <code class="classname">SampleViews</code> object.
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</p>
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<a id="cb_addsuppliers"></a>
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<pre class="programlisting"> private void addSuppliers()
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{
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<strong class="userinput"><code> Map suppliers = views.getSupplierMap();
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if (suppliers.isEmpty())
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{
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System.out.println("Adding Suppliers");
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suppliers.put(new SupplierKey("S1"),
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new SupplierData("Smith", 20, "London"));
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suppliers.put(new SupplierKey("S2"),
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new SupplierData("Jones", 10, "Paris"));
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suppliers.put(new SupplierKey("S3"),
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new SupplierData("Blake", 30, "Paris"));
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suppliers.put(new SupplierKey("S4"),
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new SupplierData("Clark", 20, "London"));
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suppliers.put(new SupplierKey("S5"),
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new SupplierData("Adams", 30, "Athens"));
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}</code></strong>
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}
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private void addParts()
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{
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<strong class="userinput"><code> Map parts = views.getPartMap();
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if (parts.isEmpty())
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{
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System.out.println("Adding Parts");
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parts.put(new PartKey("P1"),
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new PartData("Nut", "Red",
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new Weight(12.0, Weight.GRAMS),
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"London"));
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parts.put(new PartKey("P2"),
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new PartData("Bolt", "Green",
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new Weight(17.0, Weight.GRAMS),
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"Paris"));
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parts.put(new PartKey("P3"),
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new PartData("Screw", "Blue",
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new Weight(17.0, Weight.GRAMS),
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"Rome"));
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parts.put(new PartKey("P4"),
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new PartData("Screw", "Red",
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new Weight(14.0, Weight.GRAMS),
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"London"));
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parts.put(new PartKey("P5"),
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new PartData("Cam", "Blue",
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new Weight(12.0, Weight.GRAMS),
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"Paris"));
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parts.put(new PartKey("P6"),
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new PartData("Cog", "Red",
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new Weight(19.0, Weight.GRAMS),
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"London"));
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}</code></strong>
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}
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private void addShipments()
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{
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<strong class="userinput"><code> Map shipments = views.getShipmentMap();
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if (shipments.isEmpty())
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{
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System.out.println("Adding Shipments");
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shipments.put(new ShipmentKey("P1", "S1"),
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new ShipmentData(300));
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shipments.put(new ShipmentKey("P2", "S1"),
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new ShipmentData(200));
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shipments.put(new ShipmentKey("P3", "S1"),
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new ShipmentData(400));
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shipments.put(new ShipmentKey("P4", "S1"),
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new ShipmentData(200));
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shipments.put(new ShipmentKey("P5", "S1"),
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new ShipmentData(100));
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shipments.put(new ShipmentKey("P6", "S1"),
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new ShipmentData(100));
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shipments.put(new ShipmentKey("P1", "S2"),
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new ShipmentData(300));
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shipments.put(new ShipmentKey("P2", "S2"),
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new ShipmentData(400));
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shipments.put(new ShipmentKey("P2", "S3"),
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new ShipmentData(200));
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shipments.put(new ShipmentKey("P2", "S4"),
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new ShipmentData(200));
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shipments.put(new ShipmentKey("P4", "S4"),
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new ShipmentData(300));
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shipments.put(new ShipmentKey("P5", "S4"),
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new ShipmentData(400));
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}</code></strong>
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}
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}</pre>
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<p>
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The key and value classes used above were defined in the
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<a class="xref" href="BasicProgram.html#keyandvalueclasses" title="Defining Serialized Key and Value Classes">
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Defining Serialized Key and Value Classes
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</a>.
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</p>
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<p>
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In each method above, objects are added only if the map is not
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empty. This is a simple way of allowing the example program to be
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run repeatedly. In real-life applications another technique —
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checking the
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<a class="ulink" href="http://download.oracle.com/javase/1.5.0/docs/api/java/util/Map.html#containsKey(java.lang.Object)" target="_top">Map.containsKey</a>
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method, for example — might be used.
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</p>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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|
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="usingtransactions.html">Prev</a> </td>
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|
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<td width="20%" align="center">
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|||
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<a accesskey="u" href="BasicProgram.html">Up</a>
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|||
|
|
</td>
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|||
|
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<td width="40%" align="right"> <a accesskey="n" href="retrievingdatabaseitems.html">Next</a></td>
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|||
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</tr>
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|||
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<tr>
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|||
|
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<td width="40%" align="left" valign="top">
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|
Using Transactions
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</td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top">
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Retrieving Database Items
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</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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