DataNucleus provides Java data persistence and management platform allowing federation of data as well as JDO, JPA and web services interfaces. It supports heterogeneous datastores (RDBMS, db4o, LDAP, Excel, XML, NeoDatis, JSON, ODF, BigTable, HBase
关于J2EE 数据存取层的构建,JPOX is a free and fully compliant implementation of the JDO1, JDO2, JDO2.1 and JPA1 specifications, providing transparent persistence of Java objects. It supports persistence to all of the major RDBMS on the market today, persistenc