Database validation.

We are working on an application which requires a validation of the unique key 
at the database.But being relatively new to both Java(Being used as the front 
end)and DB2 on AS400(The database),we are facing some problems on the same.I 
just wanted to know of any way by which the validations can be done at the 
database level itself and not on the client side.
That may be anything , from writing a servlet or to writing a CL program on the 
AS400.
It will be of great help to me and the application on getting the solution.
Hoping for a quick solution.
Saurabh Ganguly

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