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