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DAS - Data Access Services
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..
What's new in Apache Tuscany DAS beta1
======================================
DAS core features
- Support for J2SE connections in DAS config using Driver Manager.
- Added support for multiple database schemas in queries
- Enhanced Logging
- Enhanced Optimistic Concurrency Control with overqualified updates
- Enhanced support in ApplyChanges for generating proper INSERT for empty DataObjects
- Enhanced support for invalid ResultSetMetadata
- Supporting ApplyChange commands as single atomic unit
- MySQL based test cases complete with success.
Documentation
- DAS API Javadocs now available in binary distribution
- Improved user guide available in Tuscany DAS website
- New Developer and Architect guides in Tuscany DAS website
DAS Samples
- Introduced database utility (dbConfig) to create, populate and refresh canned sample dbs
- Introduced new sample that demonstrate usage of DAS in a J2SE environment
- Introduced a new DAS sample that demonstrates DAS advanced features such as :
- Basic CRUD
- Optimistic Concurrency Control (OCC)
- Result Set Shape
- Column Converter
- Integration with dbConfig
Details are described below.
DAS Java beta1 is a superset of previous DAS Java M1 and M2 releases.
Anything in M1 or M2 is also in beta1, but beta1 contains features and bug fixes not present in M1 or M2 release.
Compatibility Concerns
- Changes on DAS Config file namespaces (http://issues.apache.org/jira/browse/TUSCANY-899). DAS config files should
changed the attribute "xmlns"'s value of the "config" tag to "http:///org.apache.tuscany.das.rdb/config.xsd".
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