code: @SuppressWarnings("rawtypes")
      public Class resolveTypeVariable(Class<?> declaringClass, String typeVarName) {
          return GenericUtils.resolveTypeVariable(daoClass, declaringClass, typeVarName);
      }
docs: 泛型类型变量在本DAO类中真正的类型
  
  @param declaringClass 声明类型变量typeVarName的类
  @param typeVarName 泛型变量名
  @return