calling stroed procedure thru jndi context

hi

ii need to call storedprocedure thru jndi context, how can i do this please
as earlier i was getting dbconnection thru jdbc and using that.
my previous code

Code:

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ds = DatabaseUtil.getDBConnection();    //get  the JDBC connection to  database.
                MyStoredProcedure sproc = new MyStoredProcedure(ds);

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how can i do this thru jndi,can somebody help me please.

Thanks
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