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This article shows you what the self-growing id is after Mybatis and spring-data-jpa acquire insert. The content is concise and easy to understand. It will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

In some scenarios, we need to get the id of the record after adding and saving it to the database, and the implementation of this scenario is included in both Mybatis and spring-data-jpa.

Id insert into sys_user (user_id, username, password) values (# {userId,jdbcType=BIGINT}, # {username,jdbcType=VARCHAR}, # {password,jdbcType=VARCHAR}) since 1.Mybatis acquired insert

Find the corresponding insert statement in the mapper file, plus two attributes of useGeneratedKeys= "true" keyProperty= "userId", where userId is the id attribute in the entity class.

The id that has grown since 2.spring-data-jpa acquired insert

Add the following statement above the id attribute of the entity class:

@ GeneratedValue (strategy = GenerationType.IDENTITY)

Add this sentence, spring data jpa can know that you want to get the saved entity, and then return to the entity, you can directly get the saved id.

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