sequence-sql

I was in the middle of implementing a database audit trail whereby CRUD operations performed through my controllers in my Web API project would serialize the old and new poco's and store their values for later retrieval (historical, rollback, etc...). When I got it all working, I did not like how it made my controllers look during a POST because I ended up having to call SaveChanges() twice, once to get the ID for the inserted entity and then again to commit the audit record which needed to know that ID. I set out to convert the project (still in its infancy) to use sequences instead of

I need for a particular business scenario to set a field on an entity (not the PK) a number from a sequence (the sequence has to be a number between min and max I defined the sequence like this : CREATE SEQUENCE MySequence MINVALUE 65536 MAXVALUE 4294967296 START WITH 65536 INCREMENT BY 1 CYCLE NOCACHE ORDER; In Java code I retrieve the number from the sequence like this : select mySequence.nextval from dual My question is : If I call this " select mySequence.nextval from dual " in a transaction and in the same time in another transaction same method is called (parallel requests) it is sure