DataNucleus是一个方便的Java组件，可提供Java数据持久性和管理平台、联合会的数据以及JDO、JPA和Web的服务接口。
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 M5发行说明：
Add support for custom class-level and field-level annotations. Add support for "native" value generator when field of different type to expected (String <-> long) Fix to in-memory query evaluation of String.substring to cater for IndexOutOfBounds Support for typing of variables in JDO Typesafe queries Fix to not call "fetch" when persisting a new object under some situations Support for persistence of Calendar as a String (where required by the datastore) Provision of query extensions static final Strings for easier refactoring Support for query extensions that are boolean to be specified as that type rather than String Enhancer : allow
user
plugin bundles JPA : Support for dynamic generation of "persistence-unit" JPA : fix for use of Enum without jdbcType RDBMS : fix to possible lockup due to internal map usage for schema RDBMS : Enable BINARY/VARBINARY support for MySQL RDBMS : Support for max/min of temporal expressions in queries RDBMS : fix to case of subquery that was not precompilable so mark the outer query as not precompilable too RDBMS : fix to Oracle when using DISTINCT to not select
BLOB/CLOB columns RDBMS : Migrate to BoneCP 0.7+ RDBMS : Support detection of timeout exceptions in JDOQL RDBMS : Fix to some situations of "complete-table" inheritance strategy usage ODF : Support persist of byte[] fields ODF : Support for "increment"/"table" value generator ODF : fix to retrieval of map field Excel : fix to ordering of inserts so we don't overwrite rows/columns Excel : fix to retrieve of map field Excel : Support for "increment"/"table" value generator Excel : Support persist of byte[] fields HBase : Cache datastore-query compilation HBase : Fix to "hbase" dependency maven groupId HBase : Support for persistence of non-serialised map fields HBase : Support use of embedded field references in queries in-datastore HBase : Support for simple parameter values in queries in-datastore MongoDB : fix to "increment" value generator MongoDB : fix to exceptions thrown on MongoDB problems to match JDO/JPA specs MongoDB : Fix to use of specified datastore name MongoDB : Support for schema validation with SchemaTool MongoDB : Support for persistence of Date/Calendar as Date (rather than String) MongoDB : Support for persistence of maps with Enums keys/values MongoDB : Fix to persist of
array field MongoDB : Cache datastore-query compilation IDEA : inclusion of plugin for IDEA, previously developed as separate project (downloadable from Intellij also)
下载地址：http://sourceforge.net/projects/datanucleus/files/datanucleus-core/3.0.0.m5/datanucleus-core-3.0.0-m5-sources.jar/download