code: public <V> V getIdValue(T instance, Class<V> valueClass) {
          return getColumnValue(instance, idFieldName, valueClass);
      }
docs: Return the value for the ID/Key column from the given instance
  
  @param instance
  the instance
  @param valueClass
  type of the value (must match the actual native type in the
  instance's class)
  @return value