In such a design, updates are applied to objects and it is the responsibility of the mapping layer to migrate those changes to a relational database.

在这样的设计中，更新被应用到了对象上，映射层的职责就是将这种变化反映到关系数据库中。

youdao

In such a design, updates are applied to objects and it is the responsibility of the mapping layer to migrate those changes to a relational database.

在这样的设计中，更新被应用到了对象上，映射层的职责就是将这种变化反映到关系数据库中。

youdao