Java 持久層框架 DataNucleus 3.0.2 發布

DataNucleus Access Platform 是一個兼容各種標準的 Java 數據持久化框架，完全兼容 JDO1, JDO2, JDO2.1, JDO2.2, JDO2.3, 和 JPA1 等 Java 標準。提供一個基于 REST 的API。通過它可以訪問所有常見的數據庫服務器，還包括 LDAP, NeoDatis, JSON, Excel/ODF spreadsheets, XML, BigTable, 和 HADOOP 數據庫等.

DataNucleus AccessPlatform 3.0 Checklist

• License : Apache 2
• Persistence Mapping Supported : JDO, JPA
• APIs Supported : JDO, JPA, REST
• Datastores Supported : RDBMS, db4o, NeoDatis, Excel, OOXML, ODF, XML, JSON, Amazon S3, GoogleStorage, HBase, MongoDB, LDAP
• Query Languages : JDOQL, JPQL, SQL, db4o Native, NeoDatis Native, NeoDatis Criteria
• JRE required : 1.5 or above
• Specifications :

DataNucleus 3.0.2 發布了，該版本主要新特性包括：

• 支持多租戶 (multitenancy) 數據庫系統
• 支持使用 Cacheonix
• Support for in-datastore evaluation of query ranges with Oracle and DB2 was added
• Support for schema evolution with MongoDB and HBase was improved.
  
• Support for specifying field JDBC type with JPA was added.
  
• SQL generation for collection/map fields was improved, particularly for use with interfaces.
  
• Many other bugs were fixed