For example, an Invoice class may have a grandTotal attribute that is used by its instances for calculation purposes, but that is not saved to the database.

例如，Invoice类会有grandtotal属性，这个属性由其实例在计算时使用，但它不保存到数据库中。

youdao

For example, an Invoice class may have a grandTotal attribute that is used by its instances for calculation purposes, but that is not saved to the database.

例如，Invoice类会有grandtotal属性，这个属性由其实例在计算时使用，但它不保存到数据库中。

youdao