In the below fuction I want to update  "account_bank_statement" table field balance_end_real with the vale balance_end. i.e "update account.bank.statement set balance_end_real=balance_end where id=ids"

"def _compute_difference(self, cr, uid, ids, fieldnames, args, context=None):
        result =  dict.fromkeys(ids, 0.0)

        for obj in self.browse(cr, uid, ids, context=context):
            
            result[obj.id] = obj.balance_end_real - obj.balance_end

        return result  "