慕粉4088762
2020-02-20 21:56
为什么直接插入,不适用optional会造成有null的情况呢?
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.
2小时上手SpringBoot
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