Upsert with a transaction

Question

I\'m using Spring with PostgreSQL and I try to do a sort of UPSERT by using a code like this:

jt.update(\"delete from A where id = 1\")
jt.update(\"insert in         


        

Answer 1

I wrote a rather large blogpost about it, so even though I might get downvotes for links, read this.

The gist is that transactions do not help in here (at least by default), and while it is possible to write correct upsert, it's actually pretty tricky.