How to access parent attributes via single table inheritance?

如何通过单表继承访问父属性？

youdao

Inheritance: Annotations — Single table, joined table, and table per class.

继承：标注——单个表、联合表和按类表。

youdao

Inheritance: Annotations — Single table, joined table, and table per class.

继承：标注——单个表、联合表和按类表。

youdao