hibernate - Hibernate new_generator_mappings 到底做了什么？

Question

Spring Boot/JPA/Hibernate 新手，我试图了解 hibernate.id.new_generator_mappings 的含义。属性实际上确实如此。

根据该文档，它:

"...directs how identity or sequence columns are generated when using @GeneratedValue"

但它并没有真正解释 true 与 false 时的行为差异。有什么想法吗？

Answer 1

This ‘hibernate.id.new_generator_mappings’ by default is false which uses the ‘SequenceHiLoGenerator‘ which will have that multiply behavior. Once we set it to true, it will then use the ‘SequenceStyleGenerator‘, which is more jpa and oracle friendly. It generates identifier values based on an sequence-style database structure. Variations range from actually using a sequence to using a table to mimic a sequence.

来源: https://vcfvct.wordpress.com/2016/04/23/jpa-sequencegenerator-with-allocationsize-1-performance-tuning/