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How to connect a database from Servlet/Jsp, EJB

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Please tell me giving concrete example code how I can connect to a database ( say SQL Server or MS Access) and interact with it {store/retrieve data).
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the only thing you have to know additionally to what is said in that tutorial is how to configure and declare a DataSource. This is done using the <resource-ref> tag in the deployment descriptor, for example:

In your program you can then look it up using JNDI. Note that res-ref-name is relative to java:comp/env.

The rest of the configuration depends on the web container or application server.

Note that it is common to use a more abstract persistence API rather than using JNDI directly. Common choices are BMP, Hibernate or a custom DAO implementation.

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