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
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.
3.0.5 版本改进记录：
Make use of bulk load from L2 cache on use of PM.getObjectsById
Support for override of metadata for inherited fields/properties in embedded objects
Fix to in-memory query evaluation when an order clause is null
Some clean ups for logging
Fix to default value of "datanucleus.identifier.case" which was incorrect in 3.0.4
RDBMS : dont load all query results when running non-tx when we retain the connection
RDBMS : Support for use of sql-type when there are multiple possible for a jdbc-type
RDBMS : Support various MySQL sql types such as LONGTEXT, MEDIUMBLOB etc
RDBMS : Some improved error messages
JSON : Support for enum fields
JSON : Support datastore identity
JSON : Support 1-1/1-N/M-N relations
JSON : Support field types that have long/String converters
JSON : Support versioning of objects
DB4O : Remove invalid import from OSGi info
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