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為什么直接插入，不適用optional會造成有null的情況呢？
2020-02-20
源自：2小時上手SpringBoot 6-2
正在回答
Saves a given entity. Use the returned instance for further operations as the save operation might have changed theentity instance completely.
Type Parameters:<S> Parameters:entity must not be null.Returns:the saved entity; will never be null.
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2020-02-21
Saves a given entity. Use the returned instance for further operations as the save operation might have changed theentity instance completely.
Type Parameters:<S> Parameters:entity must not be null.Returns:the saved entity; will never be null.