I am using one of the Spring Starter projects (gs-accessing-data-mysql-complete) and inserting three User objects through Postman
http://localhost:8080/demo/add?name=paco&[email protected]
I am getting an increment of 50 in the user_seq table only for the first two objects (??), but then no more increments happen and even more: the sequence is not used at all, it seems as if the MySQL autoincrement native feature is
Hibernate: select next_val as id_val from user_seq for update
Hibernate: update user_seq set next_val= ? where next_val=?
Hibernate: insert into user (email,name,id) values (?,?,?)
Hibernate: select next_val as id_val from user_seq for update
Hibernate: update user_seq set next_val= ? where next_val=?
Hibernate: insert into user (email,name,id) values (?,?,?)
Hibernate: insert into user (email,name,id) values (?,?,?)
Hibernate: insert into user (email,name,id) values (?,?,?)
Do you have any idea on what's is going on? is the user_seq mechanism semi-deprecated or something?
The code is this, just called from PostMan 3 times
@PostMapping(path="/add") // Map ONLY POST Requests
public @ResponseBody String addNewUser (@RequestParam String name
, @RequestParam String email) {
// @ResponseBody means the returned String is the response, not a view name
// @RequestParam means it is a parameter from the GET or POST request
User n = new User();
n.setName(name);
n.setEmail(email);
userRepository.save(n);
return "Saved";
}
With hibernate's strategy=GenerationType.AUTO mySQL DB uses a table based sequence strategy. This is a feature to increase by 50 and cache the ids to reuse.
Use strategy=GenerationType.IDENTITY
for more details read this.