Question

一个共同的要求是通过REST访问JPA数据源。我想要的是相反的情况,即JPA提供商通过将HTTP请求发送到再更新的持久性服务,这样做的好处是,任何针对JPA API的应用程序都可以很容易地在传统的JPA提供商(如Hibernate)和以REST为基础的JPA提供商之间转换,而不需要修改代码。

因此,我的问题是,是否有现有的以REST为基础的JPA供应商,如果不是,这样做是否可行?

Answer 1

Datanucleaus对RESTful json API实施JPA。然而,您的REST API必须恪守其公约:http://www.datanucleus.org/products/accessplatfor_3_0/json/support.html

他们的S3和GoogleStorage延长了json API。

在我最初的回答中将错误产品联系起来

Answer 2

首先,JPA是真正设计用于关系数据库...

第二,没有关于再生性的标准,因此JPA-REST的提供者将具体用于再生性再生性再生性应用。

您可以执行一些使用 < a href=> http://wiki. eclipse.org/Introduction_to_EIS_Projects_(ELUG)" rel="nofollow" >EclipseLink-EIS 的东西。您只需创建 JCA_ RestAdapter 执行即可。

如果您是说“ 可靠持久性服务” 时指的是一个 NOSQL 数据库, 那么也许就是其中之一。其中一些 NoSQL DB 提供了基于 REST 的界面, 一些 JPA 提供商正在开始支持 NSQL DB 。见 < a href=> http://wiki. eclipseLink/EclipseLink/ FAQ/ NoSQL" rel= “nofol” > http://wiki. eclipseLink/ FAQ/ NoSQL < /a > 。

诚实地说,你最好只是执行DAO模式, 并抽取你的 CROUD(L) 操作。这正是 DAO 的目的所在。

Answer 3

例如,看看“JEST”:

https://www.ibm.com/developmenterworks/my Developmenterworks/blogs/pinaki/entry/rest_and_jpa_working_ongong71?lang=en" rel=en"rel=nofollow">https://www.ibm.com/developersworks/my Developersworks/blogs/pinaki/entry/rest_and_jpa_working_ong71?lang=en

REST is not an API (Application Programming Interface). It is an architectural style that prescribes not to have an API to access the facilities of a service.

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On the opposite end of the stateless spectrum lies the principle of JEE Application Servers -- where the server maintains state of everything and there exists one (or multiple) API for everything. Such server-centric, stateful, API-oriented principles of JEE led to several roadblocks.

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I found REST principles concise and elegant. I also find Java Persistence API (JPA) providers have done a great job in standardizing and rationalizing the classic object-relational impedance mismatch. JPA is often misconstrued as a mere replacement of JDBC -- but it is much more than JDBC and even more than Object-Relational Mapping (ORM). JPA is be a robust way to view and update relational data as an object graph. Also core JPA notions such as detached transaction or customizable closure or persistent identity are seemed to neatly aligned with REST principles.

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