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Google应用引擎是否支持JDBC？

[英]Does Google app engine supports JDBC?

原文 2010-06-09 13:29:28 9 6 java/ google-app-engine/ jdbc/ crud

I have heard the Google App Engine[java] do not support JDBC and Hibernate. 我听说Google App Engine [java]不支持JDBC和Hibernate。 Is it true? 这是真的吗？
If yes then how do we access the database in Google App Engine. 如果是，那么我们如何在Google App Engine中访问数据库。

Also, is there any [basic] sample application which can help me understand how to perform CRUD operations in GAE. 此外，是否有任何[基本]示例应用程序可以帮助我了解如何在GAE中执行CRUD操作。

6 个解决方案

JDBC and Hibernate are not supported: http://groups.google.com/group/google-appengine-java/web/will-it-play-in-app-engine 不支持JDBC和Hibernate： http ： //groups.google.com/group/google-appengine-java/web/will-it-play-in-app-engine

I'm currently learning app engine too. 我目前正在学习app引擎。 Here's some resources and projects that have been helpful: 这里有一些有用的资源和项目：

http://code.google.com/appengine/docs/java/overview.html http://code.google.com/appengine/docs/java/overview.html

http://groups.google.com/group/google-appengine-java http://groups.google.com/group/google-appengine-java

Springsource Tool Suite is shipped with the Google Plugin for Eclipse (GPE): http://www.springsource.com/products/sts Springsource Tool Suite附带了Google Plugin for Eclipse（GPE）： http ： //www.springsource.com/products/sts

A non-trivial web app example (spring mvc/gwt/jsf + JDO + spring IOC, service layer, DAOs, DTOs, test suite): http://code.google.com/p/swagswap/ 一个非平凡的Web应用程序示例（spring mvc / gwt / jsf + JDO + spring IOC，服务层，DAO，DTO，测试套件）： http ： //code.google.com/p/swagswap/

Google uses their own type of Datastore for GAE apps. Google为GAE应用使用自己的数据存储类型。 Here is there documentation for how it works: http://code.google.com/appengine/docs/java/datastore/overview.html . 以下是有关其工作原理的文档： http ： //code.google.com/appengine/docs/java/datastore/overview.html 。 That page has examples of how it works. 该页面提供了有关其工作原理的示例。

AppEngine doesn't use a relational database. AppEngine不使用关系数据库。 You should really read the docs about how AppEngine works, starting with this Java-oriented overview of AppEngine . 您应该真正阅读有关AppEngine如何工作的文档，从这个面向Java的AppEngine概述开始。

AppEngine delivers on its scalability promise by leveraging Google-style infrastructure. AppEngine利用Google风格的基础架构实现其可扩展性承诺。 If you're looking to use a more traditional stack, you'll probably be better off with Amazon EC2 . 如果您希望使用更传统的堆栈，那么使用Amazon EC2可能会更好。

Yes, that's true. 是的，这是真的。 JDBC drivers won't work there, as long as GAE datastore is not based on RDBMS (it's rather some kind of NoSQL big-table storage). 只要GAE数据存储不是基于RDBMS（它是某种NoSQL大表存储），JDBC驱动程序就无法在那里工作。
If you want to work with GAE storage via ActiveRecord ORM (Hibernate-like), you may be interested in JPA or JDO - the both are supported. 如果您想通过ActiveRecord ORM（类似Hibernate）使用GAE存储，您可能对JPA或JDO感兴趣 - 两者都受支持。 Alternatively, you can directly use low-level API. 或者，您可以直接使用低级API。

For more information you may refer to Datastore Java API Overview . 有关更多信息，请参阅数据存储Java API概述。