如何只删除实体保存到存储核心数据？

How to remove only entities saved to store from Core Data?

youdao

类 EntityManager 用于检索，支持，更新以及删除实体。

The EntityManager class is used to retrieve, persist, update, and delete entities.

youdao

当然业务逻辑建立在创建、读取、更改以及删除实体所代表的数据的基础之上。

Certainly the business logic is based on creating, reading, updating, and deleting the data represented by the entities.

youdao