code: public static void checkTableColumn(Dao dao, Object tableName, final Class<?> clsType) {
          final NutDao d = (NutDao) dao;
          final JdbcExpert expert = d.getJdbcExpert();
          ext(d, tableName).run(new ConnCallback() {
              public void invoke(Connection conn) throws Exception {
                  Entity<?> en = d.getEntity(clsType);
                  expert.setupEntityField(conn, en);
              }
          });
      }
docs: 检查分表中是否有字段变化 提示
  
  @param dao
  Dao实例
  @param tableName
  动态表名上下文
  @param clsType
  映射Pojo