code: @Override
      protected String doBuildColumnString(String dm) {
          StringBuilder sb = new StringBuilder();
          sb.append(dm).append(createdBy);
          sb.append(dm).append(createdTime);
          sb.append(dm).append(name);
          sb.append(dm).append(updatedBy);
          sb.append(dm).append(updatedTime);
          sb.append(dm).append(value);
          sb.append(dm).append(webConfigId);
          if (sb.length() > dm.length()) {
              sb.delete(0, dm.length());
          }
          sb.insert(0, "{").append("}");
          return sb.toString();
      }
docs: ==============