DataNucleus Access Platform 3.0 M4 / 2.2.3 版本发布

今天DataNucleus Access Platform 3.0 M4 / 2.2.3 版本发布了。

DataNucleus Access Platform 是一个兼容各种标准的 Java 数据持久化框架，完全兼容 JDO1, JDO2, JDO2.1, JDO2.2, JDO2.3, 和 JPA1 等 Java 标准。提供一个基于 REST 的API。通过它可以访问所有常见的数据库服务器，还包括 LDAP, NeoDatis, JSON, Excel/ODF spreadsheets, XML, BigTable, 和 HADOOP 数据库等。

DataNucleus Access Platform 3.0 M4  版本主要改进：

• Fix to embedded field handling for RDBMS where an embedded object has a relation to a non-embedded object.
• Allow property methods (getter/setter) to be final and still handle persistence
• Fix to single-string parse for JDOQL/JPQL when using multiple subqueries
• Fix to JDOQL parse for typesafe query to allow for null literal
• Fix to persistence of Date as String for those datastores that need it
• Fix to corner case on retrieval by identity to check inheritance via discriminator
• Provide mechanism for allowing persistence properties to be specifiable on the EM/PM
• SchemaTool : support additional properties on delete/validate, and allow DDL for RDBMS on delete

更多详细信息：http://www.datanucleus.com/news/access_platform_3_0_m4.html

DataNucleus Access Platform 2.2.3 版本主要改进：

•     Fix to use of embedded fields where having a relation to a non-embedded.
•     Allow property methods (getter/setter) to be final
•     OSGi : add optional import of log4j
•     Fix to log messages so we don't call cache.size() since some don't support it
•     Mark SortedSet/SortedMap wrappers as Serializable
•     Add check for null literal in JDOQL parser
•     JPA : Fix to use of @CollectionTable
•     JPA : Improvements to XML metadata handling
•     RDBMS : fix to String.matches type handling
•     Other minor cleanups

下载地址：http://sourceforge.net/projects/datanucleus/files/datanucleus-accessplatform/