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Summary
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<h2 class="title"><a id="Summary"></a>Chapter 7.
Summary
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<p>
In summary, the DB Java Collections API tutorial has
demonstrated how to create different types of bindings, as well as
how to use the basic facilities of the DB Java Collections API:
the environment, databases, secondary indices, collections, and
transactions. The final approach illustrated by the last example
program, Serializable Entity, uses tuple keys and serial entity
values. Hopefully it is clear that any type of object-to-data
binding may be implemented by an application and used along with
standard Java collections.
</p>
<p>
The following table summarizes the differences between the
examples in the tutorial.
</p>
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<col />
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<th>Example</th>
<th>Key</th>
<th>Value</th>
<th>Entity</th>
<th>Comments</th>
</tr>
</thead>
<tbody>
<tr>
<td>
<a class="xref" href="BasicProgram.html" title="Chapter 2. The Basic Program">
The Basic Program
</a>
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<td>Serial</td>
<td>Serial</td>
<td>No</td>
<td>The shipment program</td>
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<td>
<a class="xref" href="UsingSecondaries.html" title="Chapter 3. Using Secondary Indices">
Using Secondary Indices
</a>
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<td>Serial</td>
<td>Serial</td>
<td>No</td>
<td>Secondary indices</td>
</tr>
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<td>
<a class="xref" href="Entity.html" title="Chapter 4. Using Entity Classes">
Using Entity Classes
</a>
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<td>Serial</td>
<td>Serial</td>
<td>Yes</td>
<td>Combining the key and value in a single object</td>
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<a class="xref" href="Tuple.html" title="Chapter 5. Using Tuples">
Using Tuples
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<td>Tuple</td>
<td>Serial</td>
<td>Yes</td>
<td>Compact ordered keys</td>
</tr>
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<td>
<a class="xref" href="SerializableEntity.html" title="Chapter 6. Using Serializable Entities">
Using Serializable Entities
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<td>Tuple</td>
<td>Serial</td>
<td>Yes</td>
<td>One serializable class for entities and values</td>
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<p>
Having completed this tutorial, you may want to explore how other types of
bindings can be implemented. The bindings shown in this tutorial
are all <span class="emphasis"><em>external bindings</em></span>, meaning that the data classes
themselves contain none of the binding implementation. It is also
possible to implement <span class="emphasis"><em>internal bindings</em></span>, where the data
classes implement the binding.
</p>
<p>
Internal bindings are called <span class="emphasis"><em>marshalled bindings</em></span> in the
DB Java Collections API, and in this model each data class
implements a marshalling interface. A single external binding class
that understands the marshalling interface is used to call the
internal bindings of each data object, and therefore the overall
model and API is unchanged. To learn about marshalled bindings, see
the
<span class="pdf;html">
<code class="literal">marshal</code> and <code class="literal">factory</code> examples that
came with your DB distribution (you can find them in
<code class="filename"><INSTALL_DIR>/examples/java/src/com/sleepycat/examples/collections/ship</code>
where <code class="literal"><INSTALL_DIR></code> is the location where you
unpacked your DB distribution).
</span>
These examples continue building on
the example programs used in the tutorial. The Marshal program is
the next program following the Serializable Entity program, and the
Factory program follows the Marshal program. The source code
comments in these examples explain their differences.
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Removing the Redundant Value Classes
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<a accesskey="h" href="index.html">Home</a>
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API Notes and Details
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