code: @Override
      public void addModelClassComment(TopLevelClass topLevelClass, IntrospectedTable introspectedTable) {
          Map<String, Object> map = new HashMap<>();
          map.put("mgb", MergeConstants.NEW_ELEMENT_TAG);
          map.put("topLevelClass", topLevelClass);
          map.put("introspectedTable", introspectedTable);
  
          // 添加评论
          addJavaElementComment(topLevelClass, map, EnumNode.ADD_MODEL_CLASS_COMMENT);
      }
docs: Adds a comment for a model class.  The Java code merger should
  be notified not to delete the entire class in case any manual
  changes have been made.  So this method will always use the
  "do not delete" annotation.
  
  Because of difficulties with the Java file merger, the default implementation
  of this method should NOT add comments.  Comments should only be added if
  specifically requested by the user (for example, by enabling table remark comments).
  
  @param topLevelClass
  the top level class
  @param introspectedTable
  the introspected table