#include <db_cxx.h> int DbSequence::get_key(Dbt *key);
         The DbSequence::get_key() method returns the key for the sequence.
    
           The DbSequence::get_key() method may be called at any time during the life of the
           application.
        
                The DbSequence::get_key() 
            
            
                method either returns a non-zero error value or throws an
                exception that encapsulates a non-zero error value on
                failure, and returns 0 on success.