从表中删除记录如何使用Hibernate（HQL）为表中的已删除行重新生成ID

Question

I have a table. A record from that table gets deleted (suppose id 1). How can I Insert a new record with the same id using hibernate? (right now I am using generated type auto )

Is there any alternate solution for it instead of creating getter and setter for id?

Answer 1

Usually, in SGBD, you use a sequence that generates a new unique id on demand.
When there is a delete, you generally don't care about reusing the freed slot. If you need to do it, it has to be with a custom development, by keeping a pool of available ids. This means you need to recycle ids from the deleted entities and manage concurrency accesses to it in order to keep unicity. This pool has to be persisted too.
All this has a cost, in complexity and performance.

There are several resources if you want to implement a custom id generator, like this one , but you will need to implement the recycling of ids strategy which is certainly more complex and may be not easy to hook in hibernate when there is a delete.