【IT168 资讯】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.

　　该版本改进内容众多，主要如下：

　　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)