<!--$Id: intro.so,v 1.5 2003/09/03 18:34:57 gburd Exp $--> <!--Copyright 1997-2003 by Sleepycat Software, Inc.--> <!--All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB Reference Guide: Introduction to the Java API tutorial</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> </head> <body bgcolor=white> <a name="2"><!--meow--></a> <table width="100%"><tr valign=top> <td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Java API Tutorial</dl></h3></td> <td align=right><a href="../am_misc/faq.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../bdb_basic/intro.html"><img src="../../images/next.gif" alt="Next"></a> </td></tr></table> <p> <h3 align=center>Introduction to the Java API tutorial</h3> <p>The Java API is a Java persistence framework based on the standard Java collections API. This tutorial illustrates the use of the Java API with a shipment database, a familiar example from classic database texts.</p> <p>The examples illustrate the following concepts of the Java API:</p> <p><ul type=disc> <li>Record <i>bindings</i> and <i>formats</i> <li>The database <i>environment</i> <li>Database <i>stores</i> that contain key/value records <li>Database <i>indices</i> that contain secondary keys and foreign keys <li>Java <i>collections</i> for accessing stores and indices <li><i>Transactions</i> used to commit or undo database changes </ul> <p>The examples build on each other, but at the same time the source code for each example stands alone.</p> <p><ul type=disc> <li><a href="../bdb_basic/intro.html">Basic</a> - The shipment program <li><a href="../bdb_index/intro.html">Index</a> - Indices and foreign keys <li><a href="../bdb_entity/intro.html">Entity</a> - Combining the key and value in a single object <li><a href="../bdb_tuple/intro.html">Tuple</a> - Compact ordered keys <li><a href="../bdb_sentity/intro.html">Serializable Entity</a> - One serializable class for entities and values </ul> <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> <table border=1> <tr><th>Store</th><th>Key</th><th>Value</th></tr> <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> </table> <p>In the example programs, Java classes containing the fields above are defined for the key and value of each store: <b>PartKey</b>, <b>PartValue</b>, <b>SupplierKey</b>, <b>SupplierValue</b>, <b>ShipmentKey</b> and <b>ShipmentValue</b>. 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 <b>Weight</b> class. These classes will be defined in the first example program.</p> <p>In general the Java API uses formats and bindings to describe how Java objects are stored. A format defines the stored data syntax, and a binding defines the mapping between a Java object and the stored data. The example programs show how to create different types of formats and bindings, and explains the characteristics of each type.</p> <p>The following tables contain the record values that are used in all the example programs in the tutorial.</p> <h3>Part Records</h3> <table border=1> <tr><th>Number</th><th>Name</th><th>Color</th><th>Weight</th><th>City</th></tr> <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> </table> <h3>Supplier Records</h3> <table border=1> <tr><th>Number</th><th>Name</th><th>Status</th><th>City</th></tr> <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> </table> <h3>Shipment Records</h3> <table border=1> <tr><th>Part Number</th><th>Supplier Number</th><th>Quantity</th></tr> <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> </table> <table width="100%"><tr><td><br></td><td align=right><a href="../am_misc/faq.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../bdb_basic/intro.html"><img src="../../images/next.gif" alt="Next"></a> </td></tr></table> <p><font size=1><a href="../../sleepycat/legal.html">Copyright (c) 1996-2003</a> <a href="http://www.sleepycat.com">Sleepycat Software, Inc.</a> - All rights reserved.</font> </body> </html>
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