Hibernate 4 and Postgres : How to create a sequence per table? - sql

Question

I use Hibernate 4 to use mapping to a Postgres database. Before doing mapping i create first java entities. And then, i use a java class to generate sql script from my entities. Here is my entities :
User entity
#Entity
#Table(name="myusers")
public class User {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private int id;
#Column(name="fistname")
private String firstName;
#Column(name="lastName")
private String lastName;
....
}
Project entity
#Entity
#Table(name="projects")
public class Project {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private int id;
#Column(name="title")
private String title;
#Column(name="description")
private String description;
..
}
I've noticed that #GeneratedValue(strategy = GenerationType.AUTO) produces the same sequence for table myusers and projects. If i create the first record on myusers table the id will have "1" as value and then when i create the first record in table projects, this record will have id =2. They use both the same sequence.
I want to know how i cannot modify my entities to specify to Hibernate to create a sequence for each table.

Answer 1

If you're on a recent Hibernate, try:
#GeneratedValue(strategy = GenerationType.IDENTITY)
If it still uses a sequence per table use:
#GeneratedValue(strategy = GenerationType.SEQUENCE, generator="mytable_id_seq")
#SequenceGenerator(name="mytable_id_seq", sequenceName="mytable_id_seq", allocationSize=1)
See hibernate could not get next sequence value