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<?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"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>Tutorial Introduction</title> <link rel="stylesheet" href="gettingStarted.css" type="text/css" /> <meta name="generator" content="DocBook XSL Stylesheets V1.62.4" /> <link rel="home" href="index.html" title="Berkeley DB Collections Tutorial" /> <link rel="up" href="intro.html" title="Chapter 1. Introduction " /> <link rel="previous" href="developing.html" title="Developing a DB Collections Application" /> <link rel="next" href="BasicProgram.html" title="Chapter 2. 		The Basic Program 	" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">Tutorial Introduction</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="developing.html">Prev</a> </td> <th width="60%" align="center">Chapter 1. Introduction </th> <td width="20%" align="right"> <a accesskey="n" href="BasicProgram.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="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> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="developing.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="intro.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="BasicProgram.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">Developing a DB Collections Application </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> Chapter 2. 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