DataNucleus Access Platform 2.2.1 版本发布

DataNucleus Access Platform 2.2.1 ("Geiger")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。

该版本改进:

* Support for JPQL extension functions "MONTH", "DAY", "YEAR", "HOUR", "MINUTE", "SECOND"
* When embedding a persistable field, default to the metadata of the embedded class
* JDO : fix to return type for AVG() in JDOQL to match JDO spec change
* JPA : Support attribute override for nested embedded members
* JPA : Support XML "embedded" tag
* RDBMS : Fix to retrieval of version on object in certain circumstances
* RDBMS : Fix to Collection.contains check when containing a primitive
* RDBMS : Add OSGi importPackage of principal JDBC drivers
* RDBMS : Better treatment of unmapped columns with null values
* HBase : fix to retrieval when non-persistent fields present
* HBase : support "native"(JDO)/"auto"(JPA) value generation strategies
* Enhancer : set default API (JDO) when using annotation processor

下载地址：http://www.datanucleus.org/project/download.html