What is Data Access Service?RDB DAS provides robust a generic data access service that provides transformation capability between SDO data graphs and relational databases and vise versa. 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. Service Data Object(SDO) provides a uniform API for handling different types of data. Data Access Service (DAS) simplifies handling of data when interacing 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 solutionsRDB 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. 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 and makes modifications to the graph, possibly by adding elements, and then requests the DAS to push the changes back to the databasedata source. 
To further explore the benefits of DAS please refer to white paper "DAS White Paper: The Data Access Service" on the Documentation page. General DAS Documentation 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 Tuscany Documentation page. ArticlesAvailable Articles DAS White Paper: The Data Access Service: How to access relational data in terms of Service Data Objects, a White Paper JDJ DAS Article How to access relational data in terms of Service Data Objects, Java Developer Journal Article by Kevin Williams User-level DocumentationRDB DAS User's Guide |