code: private static void validateEntity(Entity entity) throws DbRuntimeException {
  		if (null == entity) {
  			throw new DbRuntimeException("Entity is null !");
  		}
  		if (StrUtil.isBlank(entity.getTableName())) {
  			throw new DbRuntimeException("Entity`s table name is null !");
  		}
  		if (entity.isEmpty()) {
  			throw new DbRuntimeException("No filed and value in this entity !");
  		}
  	}
docs: 验证实体类对象的有效性
  
  @param entity 实体类对象
  @throws DbRuntimeException SQL异常包装，获取元数据信息失败