How does saveOrUpdate work in hibernate?

Related questions

1. What is difference between hibernate save () saveOrUpdate () and persist () methods?
2. What is the use of default constructor in hibernate?
3. What is hibernate context?
4. What is persistent in hibernate?
5. What is caching in hibernate?
6. What is caching in hibernate difference between 1st level and 2nd level caching?
7. What are transactions in hibernate?
8. Why do humans not hibernate?
9. How GET method works in hibernate?
10. Why we use hibernate?

Tags

1. #difference
2. #exists
3. #object
4. #method
5. #update
6. #insert
7. #persistent
8. #identifier
9. #based
10. #existence
11. #primary
12. #either
13. #database
14. #record
15. #generates
16. #already
17. #while
18. #between
19. #saveorupdate