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This article mainly introduces "what has DataNucleus3.0 improved". In daily operation, I believe many people have doubts about what content DataNucleus3.0 has improved. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the questions of "what has DataNucleus3.0 improved?" Next, please follow the editor to study!

The official version of DataNucleus 3.0 has been released, which separates the implementation of JDO/JPA into another jar package and adds support for MongoDB. SchemaTool supports MongoDB, HBase, ODF and Excel. Support for SQLite, improved support for HBase, support for JPA merging, and many other new features.

What is DataNucleus Access Platfor?

DataNucleus Access Platform is a Java data persistence framework compatible with various standards, fully compatible with Java standards such as JDO1, JDO2, JDO2.1, JDO2.2, JDO2.3, and JPA1. Provides an API based on REST. It provides access to all common database servers, including LDAP, NeoDatis, JSON, Excel/ODF spreadsheets, XML, BigTable, and HADOOP databases.

Improvements based on 3.0 M6 include:

JDO:Add ability to hook into transaction events via listener

JPA: fixed an issue where DetachAllOnRollback was not set

JPA:Fix fetch flag observance when read from XML

JPA: fixed a problem with a separate EMF model

The main improvement of Java type management: support the specific configuration of generic specification, and the access speed of type information has been greatly improved.

Mobile SCO container backup is stored in the RDBMS plug-in

Fixed the use of version metadata involving inheritance aspects of classes, which affected multiple storage plug-ins

Fix all operations that involve schema updates to respect the "autoCreate" flags (so they now can correctly prevent any schema changes)

MongoDB:fix to use of IDENTITY for datastore id

MongoDB: fixed inheritance query

MongoDB: added additional processing capabilities for MongoDB data types

Maven: fixed a problem with setting up CLASSPATH in some cases

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