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<?xml version="1.0" encoding="UTF-8"?>
<document>
<properties>
<title>Tuscany DAS</title>
<bannertitle>Tuscany DAS</bannertitle>
<author email="luckbr1975@gmail.com">Luciano Resende</author>
<tab>das</tab>
</properties>
<body>
<section name="Data Access Service - Overview">
<p>RDB DAS provides robust a generic data access service that provides
transformation capability between SDO data graphs and relational databases and
vise versa. </p>
<p>By using RDB DAS, applications developers avoid the details and complications
of working directly with a relational database and also the complex transformation
between relational rows/columns and Data Object types/properties.
</p>
<p>RDB DAS works with SDO to improve your data access performance.The RDB DAS
processes the SDO change summary and produces efficient update statements
that only write to columns that have actually been modified.
</p>
<p>The following diagram illustrates these two capabilities in
a typical client interaction.The client
starts by reading a graph of data specified by some query.The client then makes modifications to the
graph, possibly by adding elements, and then requests the DAS to push the
changes back to the database.</p>
<img src ="images/sdo_das_sm.jpg" alt="DAS Capabilities" align="middle" border="0" height="407" width="600"/>
<p>To further explore the benefits of DAS please refer to white
paper "DAS White Paper: The Data Access Service" on the <a
href="documentation.html">Documentation
page</a>.</p>
</section>
<section name="General DAS Documentation">
<p>Below, there is a list of various links to documents that help to explain various aspects of the
Tuscany DAS subproject and the programming model that it provides. More general documentation
which applies to the Tuscany project as a whole can be found on the
<a href="documentation.html">Tuscany Documentation page</a>.
</p>
<p>
<table class="bodyTable">
<tr class="b">
<td>
<span style="font-weight: bold;">Title</span>
</td>
<td>
<span style="font-weight: bold;">Description</span>
</td>
</tr>
<tr class="b">
<td>
<a href='RDB_DAS_white_paper_v-0.2.pdf' target='_blank'>DAS White Paper: The Data Access Service</a>
</td>
<td>
How to access relational data in terms of Service Data Objects
</td>
</tr>
<tr class="b">
<td>
<a class="external" rel="nofollow" href='http://java.sys-con.com/read/260053.htm'>JDJ DAS Article</a>
</td>
<td>
How to access relational data in terms of Service Data Objects
</td>
</tr>
</table>
</p>
</section>
</body>
</document>
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