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📄 preface.html(5.62 KB)
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Editing: retrievingdatabaseitems.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">
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    <title>Retrieving Database Items</title>
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    <div xmlns="" class="navheader">
      <div class="libver">
        <p>Library Version 11.2.5.3</p>
      </div>
      <table width="100%" summary="Navigation header">
        <tr>
          <th colspan="3" align="center">
		Retrieving Database Items
	</th>
        </tr>
        <tr>
          <td width="20%" align="left"><a accesskey="p" href="addingdatabaseitems.html">Prev</a> </td>
          <th width="60%" align="center">Chapter 2. 
		The Basic Program
	</th>
          <td width="20%" align="right"> <a accesskey="n" href="handlingexceptions.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="retrievingdatabaseitems"></a>
		Retrieving Database Items
	</h2>
          </div>
        </div>
      </div>
      <p>
    Retrieving information from the database is accomplished via the
	standard Java collections API. In the example, the 
	<a class="ulink" href="http://download.oracle.com/javase/1.5.0/docs/api/java/util/Set.html#iterator()" target="_top">Set.iterator</a>
	
    method is used to iterate all 
	<a class="ulink" href="http://download.oracle.com/javase/1.5.0/docs/api/java/util/Map.Entry.html" target="_top">Map.Entry</a>
	
	objects for each store. All standard Java methods for retrieving
	objects from a collection may be used with the DB Java Collections API.
</p>
      <p>
    The <code class="methodname">PrintDatabase.doWork()</code> method calls
    <code class="methodname">printEntries()</code>
	to print the map entries for each database store. It is called via
	the 
    <a class="ulink" href="../../java/com/sleepycat/collections/TransactionRunner.html" target="_top">TransactionRunner</a>
    
	class and was outlined in the previous section.
</p>
      <a id="cb_printdatabase"></a>
      <pre class="programlisting">import java.util.Iterator;
...
public class Sample
{
    ...
    private SampleViews views;
    ...
    private class PrintDatabase implements TransactionWorker
    {
        public void doWork()
            throws Exception
        {
<strong class="userinput"><code>            printEntries("Parts",
                          views.getPartEntrySet().iterator());
            printEntries("Suppliers",
                          views.getSupplierEntrySet().iterator());
            printEntries("Shipments",
                          views.getShipmentEntrySet().iterator());</code></strong>
        }
    }
    ...

<strong class="userinput"><code>    private void printEntries(String label, Iterator iterator)
    {
    }</code></strong>
    ...
} </pre>
      <p>
    The 
    <a class="ulink" href="http://download.oracle.com/javase/1.5.0/docs/api/java/util/Set.html" target="_top">Set</a>
    
	of 
    <a class="ulink" href="http://download.oracle.com/javase/1.5.0/docs/api/java/util/Map.Entry.html" target="_top">Map.Entry</a>
    
	objects for each store is obtained from the <code class="classname">SampleViews</code>
	object. This set can also be obtained by calling the 
	<a class="ulink" href="http://download.oracle.com/javase/1.5.0/docs/api/java/util/Map.html#entrySet()" target="_top">Map.entrySet</a>
	
	method of a stored map.
</p>
      <p>
    The <code class="methodname">printEntries()</code> prints the map entries for any stored
	map. The 
	<a class="ulink" href="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html#toString()" target="_top">Object.toString</a>
	
	method of each key and value is called to
	obtain a printable representation of each object.
</p>
      <a id="cb_printentries"></a>
      <pre class="programlisting">    private void printEntries(String label, Iterator iterator)
    {
<strong class="userinput"><code>        System.out.println("\n--- " + label + " ---");
        while (iterator.hasNext())
        {
            Map.Entry entry = (Map.Entry) iterator.next();
            System.out.println(entry.getKey().toString());
            System.out.println(entry.getValue().toString());
        }</code></strong>
    } </pre>
      <p>
    This is one of a small number of behavioral differences between
	standard Java collections and stored collections. For a complete
	list see 
    <a class="xref" href="UsingStoredCollections.html" title="Using Stored Collections">
        Using Stored Collections
    </a>.
</p>
      <p>
    The output of the example program is shown below.
</p>
      <pre class="programlisting">Adding Suppliers
Adding Parts
Adding Shipments

--- Parts ---
PartKey: number=P1
PartData: name=Nut color=Red weight=[12.0 grams] city=London
PartKey: number=P2
PartData: name=Bolt color=Green weight=[17.0 grams] city=Paris
PartKey: number=P3
PartData: name=Screw color=Blue weight=[17.0 grams] city=Rome
PartKey: number=P4
PartData: name=Screw color=Red weight=[14.0 grams] city=London
PartKey: number=P5
PartData: name=Cam color=Blue weight=[12.0 grams] city=Paris
PartKey: number=P6
PartData: name=Cog color=Red weight=[19.0 grams] city=London

--- Suppliers ---
SupplierKey: number=S1
SupplierData: name=Smith status=20 city=London
SupplierKey: number=S2
SupplierData: name=Jones status=10 city=Paris
SupplierKey: number=S3
SupplierData: name=Blake status=30 city=Paris
SupplierKey: number=S4
SupplierData: name=Clark status=20 city=London
SupplierKey: number=S5
SupplierData: name=Adams status=30 city=Athens

--- Shipments ---
ShipmentKey: supplier=S1 part=P1
ShipmentData: quantity=300
ShipmentKey: supplier=S2 part=P1
ShipmentData: quantity=300
ShipmentKey: supplier=S1 part=P2
ShipmentData: quantity=200
ShipmentKey: supplier=S2 part=P2
ShipmentData: quantity=400
ShipmentKey: supplier=S3 part=P2
ShipmentData: quantity=200
ShipmentKey: supplier=S4 part=P2
ShipmentData: quantity=200
ShipmentKey: supplier=S1 part=P3
ShipmentData: quantity=400
ShipmentKey: supplier=S1 part=P4
ShipmentData: quantity=200
ShipmentKey: supplier=S4 part=P4
ShipmentData: quantity=300
ShipmentKey: supplier=S1 part=P5
ShipmentData: quantity=100
ShipmentKey: supplier=S4 part=P5
ShipmentData: quantity=400
ShipmentKey: supplier=S1 part=P6
ShipmentData: quantity=100 </pre>
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