code: public static List<Field> getNotKeyColumns(Class<?> clazz) {
  		List<Field> fields = getColumns(clazz);
  		
  		List<Field> keyFields = new ArrayList<Field>();
  		for(Field field : fields) {
  			Column column = field.getAnnotation(Column.class);
  			if(!column.isKey()) {
  				keyFields.add(field);
  			}
  		}
  		return keyFields;
  	}
docs: 获得字段里面的非key字段
  @param clazz
  @return