how to connect session bean to database and run it on J2EE

Hi guys,
I was trying to connect session bean to database but was confused as to where to write the code for database connection(which method) ?? Also how do i configure my J2EE settings to deploy this bean ??

Is session bean best to connect to database or entity bean (if i do not care about persistence).

Also how is the following flow done --
servlet calling--session bean ---calling entity bean .

Any sample code will be of great help.

thank you so much.

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Java EE

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