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<th width="60%" align="center">Chapter 1.
Introduction
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<div class="sect1" lang="en" xml:lang="en">
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<h2 class="title" style="clear: both"><a id="tutorialintroduction"></a>Tutorial Introduction</h2>
</div>
</div>
<div></div>
</div>
<p>
Most of the remainder of this document illustrates the use of the
DB Java Collections API by presenting a tutorial that describes usage of the API.
This tutorial builds a shipment database, a familiar example from classic
database texts.
</p>
<p>
The examples illustrate the following concepts of the DB Java Collections API:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
Object-to-data <span class="emphasis"><em>bindings</em></span>
</p>
</li>
<li>
<p>
The database <span class="emphasis"><em>environment</em></span>
</p>
</li>
<li>
<p>
<span class="emphasis"><em>Databases</em></span> that contain key/value records
</p>
</li>
<li>
<p>
<span class="emphasis"><em>Secondary index</em></span> databases that contain index keys
</p>
</li>
<li>
<p>
Java <span class="emphasis"><em>collections</em></span> for accessing databases and
indices
</p>
</li>
<li>
<p>
<span class="emphasis"><em>Transactions</em></span> used to commit or undo database
changes
</p>
</li>
</ul>
</div>
<p>
The examples build on each other, but at the same time the
source code for each example stands alone.
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
<a href="BasicProgram.html">
The Basic Program
</a>
</p>
</li>
<li>
<p>
<a href="UsingSecondaries.html">
Using Secondary Indices
</a>
</p>
</li>
<li>
<p>
<a href="Entity.html">
Using Entity Classes
</a>
</p>
</li>
<li>
<p>
<a href="Tuple.html">
Using Tuples
</a>
</p>
</li>
<li>
<p>
<a href="SerializableEntity.html">
Using Serializable Entities
</a>
</p>
</li>
</ul>
</div>
<p>
The shipment database consists of three database stores: the
part store, the supplier store, and the shipment store. Each store
contains a number of records, and each record consists of a key and
a value.
</p>
<div class="informaltable">
<table border="1" width="80%">
<colgroup>
<col />
<col />
<col />
</colgroup>
<thead>
<tr>
<th>Store</th>
<th>Key</th>
<th>Value</th>
</tr>
</thead>
<tbody>
<tr>
<td>Part</td>
<td>Part Number</td>
<td>Name, Color, Weight, City</td>
</tr>
<tr>
<td>Supplier</td>
<td>Supplier Number</td>
<td>Name, Status, City</td>
</tr>
<tr>
<td>Shipment</td>
<td>Part Number, Supplier Number</td>
<td>Quantity</td>
</tr>
</tbody>
</table>
</div>
<p>
In the example programs, Java classes containing the fields
above are defined for the key and value of each store:
<tt class="classname">PartKey</tt>,
<tt class="classname">PartData</tt>,
<tt class="classname">SupplierKey</tt>,
<tt class="classname">SupplierData</tt>,
<tt class="classname">ShipmentKey</tt> and <tt class="classname">ShipmentData</tt>. In
addition, because the Part's Weight field is itself composed of two
fields — the weight value and the unit of measure — it is
represented by a separate <tt class="classname">Weight</tt> class. These classes will
be defined in the first example program.
</p>
<p>
In general the DB Java Collections API uses bindings to
describe how Java objects are stored. A binding defines the stored
data syntax and the mapping between a Java object and the stored
data. The example programs show how to create different types of
bindings, and explains the characteristics of each type.
</p>
<p>
The following tables show the record values that are used in
all the example programs in the tutorial.
<span>
</span>
</p>
<div class="informaltable">
<table border="1" width="80%">
<colgroup>
<col />
<col />
<col />
<col />
<col />
</colgroup>
<thead>
<tr>
<th>Number</th>
<th>Name</th>
<th>Color</th>
<th>Weight</th>
<th>City</th>
</tr>
</thead>
<tbody>
<tr>
<td>P1</td>
<td>Nut</td>
<td>Red</td>
<td>12.0 grams</td>
<td>London</td>
</tr>
<tr>
<td>P2</td>
<td>Bolt</td>
<td>Green</td>
<td>17.0 grams</td>
<td>Paris</td>
</tr>
<tr>
<td>P3</td>
<td>Screw</td>
<td>Blue</td>
<td>17.0 grams</td>
<td>Rome</td>
</tr>
<tr>
<td>P4</td>
<td>Screw</td>
<td>Red</td>
<td>14.0 grams</td>
<td>London</td>
</tr>
<tr>
<td>P5</td>
<td>Cam</td>
<td>Blue</td>
<td>12.0 grams</td>
<td>Paris</td>
</tr>
<tr>
<td>P6</td>
<td>Cog</td>
<td>Red</td>
<td>19.0 grams</td>
<td>London</td>
</tr>
</tbody>
</table>
</div>
<div class="informaltable">
<table border="1" width="80%">
<colgroup>
<col />
<col />
<col />
<col />
</colgroup>
<thead>
<tr>
<th>Number</th>
<th>Name</th>
<th>Status</th>
<th>City</th>
</tr>
</thead>
<tbody>
<tr>
<td>S1</td>
<td>Smith</td>
<td>20</td>
<td>London</td>
</tr>
<tr>
<td>S2</td>
<td>Jones</td>
<td>10</td>
<td>Paris</td>
</tr>
<tr>
<td>S3</td>
<td>Blake</td>
<td>30</td>
<td>Paris</td>
</tr>
<tr>
<td>S4</td>
<td>Clark</td>
<td>20</td>
<td>London</td>
</tr>
<tr>
<td>S5</td>
<td>Adams</td>
<td>30</td>
<td>Athens</td>
</tr>
</tbody>
</table>
</div>
<div class="informaltable">
<table border="1" width="80%">
<colgroup>
<col />
<col />
<col />
</colgroup>
<thead>
<tr>
<th>Part Number</th>
<th>Supplier Number</th>
<th>Quantity</th>
</tr>
</thead>
<tbody>
<tr>
<td>P1</td>
<td>S1</td>
<td>300</td>
</tr>
<tr>
<td>P1</td>
<td>S2</td>
<td>300</td>
</tr>
<tr>
<td>P2</td>
<td>S1</td>
<td>200</td>
</tr>
<tr>
<td>P2</td>
<td>S2</td>
<td>400</td>
</tr>
<tr>
<td>P2</td>
<td>S3</td>
<td>200</td>
</tr>
<tr>
<td>P2</td>
<td>S4</td>
<td>200</td>
</tr>
<tr>
<td>P3</td>
<td>S1</td>
<td>400</td>
</tr>
<tr>
<td>P4</td>
<td>S1</td>
<td>200</td>
</tr>
<tr>
<td>P4</td>
<td>S4</td>
<td>300</td>
</tr>
<tr>
<td>P5</td>
<td>S1</td>
<td>100</td>
</tr>
<tr>
<td>P5</td>
<td>S4</td>
<td>400</td>
</tr>
<tr>
<td>P6</td>
<td>S1</td>
<td>100</td>
</tr>
</tbody>
</table>
</div>
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The Basic Program
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