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From conflue...@apache.org
Subject [CONF] Apache Tuscany: DAS Overview (page edited)
Date Tue, 31 Jul 2007 22:52:01 GMT
DAS Overview (TUSCANY) edited by haleh mahbod
      Page: http://cwiki.apache.org/confluence/display/TUSCANY/DAS+Overview
   Changes: http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=47561&originalVersion=28&revisedVersion=29






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h4. What is Data Access Service?

Service Data Object(SDO) provides a uniform API for handling different types of data. Data
Access Service (DAS) simplifies handling of data when interacting with the back-end data source
and frees application developers from dealing with tedious and error-prone transformation
between end source types and SDO Data Object Types/properties. 

Tuscany provides implementation for different flavors of DAS in two languages, Java and C++.
Please follow the link under each language to explore what is available or is in progress.
We welcome your help to extend support for other back-end data source types or complete the
existing solutions.

The following diagram illustrates a typical client interaction. The client starts by reading
a graph of data and makes modifications to the graph, possibly by adding elements, and then
requests the DAS to push the changes back to the data source.
!sdo_das_sm.jpg!
		
h3. Learn more about DAS	
		
* [The Data Access Service: How to access relational data in terms of Service Data Objects|
http://incubator.apache.org/tuscany/RDB_DAS_white_paper_v-0.2.pdf], a White Paper

* [How to access relational data in terms of Service Data Objects|http://java.sys-con.com/read/260053.htm],
Java Developer Journal Article by Kevin Williams

* [Tuscany DAS Overview |^RDB-DAS-Overview.pdf], Kevin Williams and Luciano Resende 

* [Luciano's blog on SDO/DAS and other SOA technologies|http://lresende.blogspot.com/]

* [Data Service and SCA|^das-data-services-v01.pdf], Luciano Resende

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