Does Google app engine supports JDBC?

I have heard the Google App Engi开发者_开发百科ne[java] do not support JDBC and Hibernate. Is it true?

If yes then how do we access the database in Google App Engine.

Also, is there any [basic] sample application which can help me understand how to perform CRUD operations in GAE.

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

I'm currently learning app engine too. Here's some resources and projects that have been helpful:

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

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

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/

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Google uses their own type of Datastore for GAE apps. Here is there documentation for how it works: http://code.google.com/appengine/docs/java/datastore/overview.html. That page has examples of how it works.

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AppEngine doesn't use a relational database. You should really read the docs about how AppEngine works, starting with this Java-oriented overview of AppEngine.

AppEngine delivers on its scalability promise by leveraging Google-style infrastructure. If you're looking to use a more traditional stack, you'll probably be better off with Amazon EC2.

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Yes, that's true. 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).
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. Alternatively, you can directly use low-level API.

For more information you may refer to Datastore Java API Overview.

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Storing data in a scalable web application can be tricky.

You have to use their datastore API. http://code.google.com/appengine/docs/java/gettingstarted/usingdatastore.html

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There is an early-stage 3rd party project to build a JDBC driver for the App Engine nonrel datastore:

http://www.jiql.org/xwiki/bin/view/Main/