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-<title>Berkeley DB Reference Guide: Tuple - Compact ordered keys</title>
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-<td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Java API Tutorial - Tuple</dl></h3></td>
-<td align=right><a href="../bdb_entity/read.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../bdb_tuple/format.html"><img src="../../images/next.gif" alt="Next"></a>
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-<p>
-<h3 align=center>Tuple - Compact ordered keys</h3>
-<p>Java API <i>tuples</i> are sequences of primitive Java data types,
-for example, integers and strings.  The <i>tuple format</i> is a
-binary format for tuples that can be used to store keys and/or values.</p>
-<p>Tuples are useful as keys because they have a meaningful sort order,
-while serialized objects do not.  This is because the binary data for a tuple
-is written in such a way that its raw byte ordering provides a useful sort
-order.  For example, strings in tuples are written with a null terminator
-rather than with a leading length.</p>
-<p>Tuples are useful as keys <i>or</i> values when reducing the record
-size to a minimum is important.  A tuple is significantly smaller than an
-equivalent serialized object.  However, unlike serialized objects, tuples
-cannot contain complex data types and are not easily extended except by adding
-fields at the end of the tuple.</p>
-<p>Whenever a tuple format is used, except when the key or value class is a
-Java primitive class, a <i>tuple binding</i> class must be implemented to
-map between the Java object and the tuple fields.  Because of this extra
-requirement, and because tuples are not easily extended, a useful technique
-shown in this example is to use tuples for keys and serialized objects for
-values.  This provides compact ordered keys but still allows arbitrary Java
-objects as values, and avoids implementing a tuple binding for each value
-class.</p>
-<p>The example program illustrates:</p>
-<p><ul type=disc>
-<li><a href="format.html">Using the tuple format</a>
-<li><a href="extract.html">Using tuples with key extractors</a>
-<li><a href="tbinding.html">Creating tuple key bindings</a>
-<li><a href="tsbinding.html">Creating tuple-serial entity bindings</a>
-<li><a href="sorted.html">Using sorted collections</a>
-</ul>
-<p>Compare this example to the prior Entity example and you'll see that the
-<b>Sample</b> class has not changed. When changing a database format, while
-new bindings are needed to map key and value objects to the new format, the
-application using the objects often does not need to be modified.</p>
-<p>The complete source
-of the final version of the example program is included in the Berkeley DB
-distribution.</p>
-<table width="100%"><tr><td><br></td><td align=right><a href="../bdb_entity/read.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../bdb_tuple/format.html"><img src="../../images/next.gif" alt="Next"></a>
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